diff --git a/docs/nixos-options.md b/docs/nixos-options.md
index 596cc5e..296d9c6 100644
--- a/docs/nixos-options.md
+++ b/docs/nixos-options.md
@@ -33,7 +33,7 @@ List of enabled check sets\. Each check set is a module which checks something a
 
 
 *Type:*
-list of (one of “start”, “stop”, “cpu”, “ram”, “temp”, “vulnix”)
+list of (one of “start”, “stop”, “remind”, “cpu”, “ram”, “temp”, “net”, “vulnix”)
 
 
 
@@ -52,7 +52,7 @@ CPU load percentage for a critical alert to be sent\. Null means never generate
 
 
 *Type:*
-null or floating point number
+null or (positive integer or floating point number, meaning >0)
 
 
 
@@ -73,7 +73,7 @@ CPU load percentage for a warning alert to be sent\. Null means never generate a
 
 
 *Type:*
-null or floating point number
+null or (positive integer or floating point number, meaning >0)
 
 
 
@@ -85,6 +85,166 @@ null or floating point number
 
 
 
+## services\.lego-monitoring\.checks\.net\.interfaces
+
+
+
+Per-interface configuration of IO byte thresholds\.
+
+
+
+*Type:*
+attribute set of (submodule)
+
+
+
+*Default:*
+` { } `
+
+
+
+*Example:*
+
+```
+{
+  br0 = {
+    warningThresholdCombBytes = 700 * 1024 * 128;        # 700 Megabits
+    criticalThresholdCombBytes = 1 * 1024 * 1024 * 128;  # 1 Gigabit
+  };
+}
+```
+
+*Declared by:*
+ - [modules/options\.nix](../modules/options.nix)
+
+
+
+## services\.lego-monitoring\.checks\.net\.interfaces\.\<name>\.criticalThresholdCombBytes
+
+
+
+Combined (sent + received) bytes per second threshold for a critical alert to be sent\. If null, this threshold is disabled and not checked\.
+
+
+
+*Type:*
+null or (positive integer, meaning >0)
+
+
+
+*Default:*
+` null `
+
+*Declared by:*
+ - [modules/options\.nix](../modules/options.nix)
+
+
+
+## services\.lego-monitoring\.checks\.net\.interfaces\.\<name>\.criticalThresholdRecvBytes
+
+
+
+Received bytes per second threshold for a critical alert to be sent\. If null, this threshold is disabled and not checked\.
+
+
+
+*Type:*
+null or (positive integer, meaning >0)
+
+
+
+*Default:*
+` null `
+
+*Declared by:*
+ - [modules/options\.nix](../modules/options.nix)
+
+
+
+## services\.lego-monitoring\.checks\.net\.interfaces\.\<name>\.criticalThresholdSentBytes
+
+
+
+Sent bytes per second threshold for a critical alert to be sent\. If null, this threshold is disabled and not checked\.
+
+
+
+*Type:*
+null or (positive integer, meaning >0)
+
+
+
+*Default:*
+` null `
+
+*Declared by:*
+ - [modules/options\.nix](../modules/options.nix)
+
+
+
+## services\.lego-monitoring\.checks\.net\.interfaces\.\<name>\.warningThresholdCombBytes
+
+
+
+Combined (sent + received) bytes per second threshold for a warning alert to be sent\. If null, this threshold is disabled and not checked\.
+
+
+
+*Type:*
+null or (positive integer, meaning >0)
+
+
+
+*Default:*
+` null `
+
+*Declared by:*
+ - [modules/options\.nix](../modules/options.nix)
+
+
+
+## services\.lego-monitoring\.checks\.net\.interfaces\.\<name>\.warningThresholdRecvBytes
+
+
+
+Received bytes per second threshold for a warning alert to be sent\. If null, this threshold is disabled and not checked\.
+
+
+
+*Type:*
+null or (positive integer, meaning >0)
+
+
+
+*Default:*
+` null `
+
+*Declared by:*
+ - [modules/options\.nix](../modules/options.nix)
+
+
+
+## services\.lego-monitoring\.checks\.net\.interfaces\.\<name>\.warningThresholdSentBytes
+
+
+
+Sent bytes per second threshold for a warning alert to be sent\. If null, this threshold is disabled and not checked\.
+
+
+
+*Type:*
+null or (positive integer, meaning >0)
+
+
+
+*Default:*
+` null `
+
+*Declared by:*
+ - [modules/options\.nix](../modules/options.nix)
+
+
+
 ## services\.lego-monitoring\.checks\.ram\.criticalPercentage
 
 
@@ -94,7 +254,7 @@ RAM usage percentage for a critical alert to be sent\. Null means never generate
 
 
 *Type:*
-null or floating point number
+null or (positive integer or floating point number, meaning >0)
 
 
 
@@ -115,7 +275,7 @@ RAM usage percentage for a warning alert to be sent\. Null means never generate
 
 
 *Type:*
-null or floating point number
+null or (positive integer or floating point number, meaning >0)
 
 
 
@@ -265,7 +425,7 @@ Critical temperature threshold\.
 
 
 *Type:*
-null or floating point number
+null or (positive integer or floating point number, meaning >0)
 
 
 
@@ -307,7 +467,7 @@ Warning temperature threshold\.
 
 
 *Type:*
-null or floating point number
+null or (positive integer or floating point number, meaning >0)
 
 
 
diff --git a/flake.lock b/flake.lock
index 3738870..1cc4fe8 100644
--- a/flake.lock
+++ b/flake.lock
@@ -16,6 +16,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-29335f": {
+      "locked": {
+        "lastModified": 1745804731,
+        "narHash": "sha256-v/sK3AS0QKu/Tu5sHIfddiEHCvrbNYPv8X10Fpux68g=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "29335f23bea5e34228349ea739f31ee79e267b88",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "29335f23bea5e34228349ea739f31ee79e267b88",
+        "type": "github"
+      }
+    },
     "pyproject-build-systems": {
       "inputs": {
         "nixpkgs": [
@@ -65,6 +81,7 @@
     "root": {
       "inputs": {
         "nixpkgs": "nixpkgs",
+        "nixpkgs-29335f": "nixpkgs-29335f",
         "pyproject-build-systems": "pyproject-build-systems",
         "pyproject-nix": "pyproject-nix",
         "uv2nix": "uv2nix"
@@ -80,11 +97,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1745697651,
-        "narHash": "sha256-r4A/fkiCenEapHkjJWPiNUZEfviuXMCr6mRozJ5dC4o=",
+        "lastModified": 1749170547,
+        "narHash": "sha256-zOptuFhTr9P0A+unFaOBFx5E5T6yx0qE8VrUGVrM96U=",
         "owner": "pyproject-nix",
         "repo": "uv2nix",
-        "rev": "cb6508484d534dafd097713b575f2aebc3417de0",
+        "rev": "7ae60727d4fc2e41aefd30da665e4f92ba8298f1",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 7fb2bd2..28f27fa 100644
--- a/flake.nix
+++ b/flake.nix
@@ -1,6 +1,8 @@
 {
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.05";
+    # this is for uv 0.6.17, 0.7.0 has a change uv2nix doesn't yet support: https://github.com/astral-sh/uv/pull/13176
+    nixpkgs-29335f.url = "github:nixos/nixpkgs/29335f23bea5e34228349ea739f31ee79e267b88";
 
     pyproject-nix = {
       url = "github:pyproject-nix/pyproject.nix";
@@ -25,6 +27,7 @@
     {
       self,
       nixpkgs,
+      nixpkgs-29335f,
       uv2nix,
       pyproject-nix,
       pyproject-build-systems,
@@ -78,6 +81,7 @@
 
       # This example is only using x86_64-linux
       pkgs = nixpkgs.legacyPackages.x86_64-linux;
+      pkgs-29335f = nixpkgs-29335f.legacyPackages.x86_64-linux;
 
       # Use Python 3.12 from nixpkgs
       python = pkgs.python312;
@@ -125,7 +129,7 @@
         impure = pkgs.mkShell {
           packages = [
             python
-            pkgs.uv
+            pkgs-29335f.uv
           ];
           env =
             {
@@ -205,7 +209,7 @@
           pkgs.mkShell {
             packages = [
               virtualenv
-              pkgs.uv
+              pkgs-29335f.uv
             ];
 
             env = {
diff --git a/modules/default.nix b/modules/default.nix
index 1cff5ad..4dd838d 100644
--- a/modules/default.nix
+++ b/modules/default.nix
@@ -60,6 +60,15 @@ package:
           warning_percentage = warningPercentage;
           critical_percentage = criticalPercentage;
         };
+
+        net.interfaces = lib.mapAttrs (_: interfaceCfg: {
+          warning_threshold_sent_bytes = interfaceCfg.warningThresholdSentBytes;
+          critical_threshold_sent_bytes = interfaceCfg.criticalThresholdSentBytes;
+          warning_threshold_recv_bytes = interfaceCfg.warningThresholdRecvBytes;
+          critical_threshold_recv_bytes = interfaceCfg.warningThresholdRecvBytes;
+          warning_threshold_comb_bytes = interfaceCfg.warningThresholdCombBytes;
+          critical_threshold_comb_bytes = interfaceCfg.criticalThresholdCombBytes;
+        }) cfg.checks.net.interfaces;
       };
     };
   in lib.mkIf cfg.enable {
diff --git a/modules/options.nix b/modules/options.nix
index b4984d6..6cf9a24 100644
--- a/modules/options.nix
+++ b/modules/options.nix
@@ -6,6 +6,7 @@
 let
   tempSensorOptions = (import ./suboptions/tempSensorOptions.nix) { inherit lib; };
   vulnixWhitelistRule = (import ./suboptions/vulnixWhitelistRule.nix) { inherit lib; };
+  netInterfaceOptions = (import ./suboptions/netInterfaceOptions.nix) { inherit lib; };
 in
 {
   options.services.lego-monitoring = {
@@ -32,6 +33,7 @@ in
         "cpu"
         "ram"
         "temp"
+        "net"
 
         "vulnix"
       ]);
@@ -96,12 +98,12 @@ in
 
       cpu = {
         warningPercentage = lib.mkOption {
-          type = lib.types.nullOr lib.types.float;
+          type = lib.types.nullOr lib.types.numbers.positive;
           default = 80.0;
           description = "CPU load percentage for a warning alert to be sent. Null means never generate a CPU warning alert.";
         };
         criticalPercentage = lib.mkOption {
-          type = lib.types.nullOr lib.types.float;
+          type = lib.types.nullOr lib.types.numbers.positive;
           default = 90.0;
           description = "CPU load percentage for a critical alert to be sent. Null means never generate a CPU critical alert.";
         };
@@ -109,16 +111,31 @@ in
 
       ram = {
         warningPercentage = lib.mkOption {
-          type = lib.types.nullOr lib.types.float;
+          type = lib.types.nullOr lib.types.numbers.positive;
           default = 80.0;
           description = "RAM usage percentage for a warning alert to be sent. Null means never generate a RAM warning alert.";
         };
         criticalPercentage = lib.mkOption {
-          type = lib.types.nullOr lib.types.float;
+          type = lib.types.nullOr lib.types.numbers.positive;
           default = 90.0;
           description = "RAM usage percentage for a critical alert to be sent. Null means never generate a RAM critical alert.";
         };
       };
+
+      net = {
+        interfaces = lib.mkOption {
+          type = lib.types.attrsOf (lib.types.submodule netInterfaceOptions);
+          default = { };
+          description = "Per-interface configuration of IO byte thresholds.";
+          example = lib.literalExpression ''
+            {
+              br0 = {
+                warningThresholdCombBytes = 700 * 1024 * 128;        # 700 Megabits
+                criticalThresholdCombBytes = 1 * 1024 * 1024 * 128;  # 1 Gigabit
+              };
+            }'';
+        };
+      };
     };
   };
 }
diff --git a/modules/suboptions/netInterfaceOptions.nix b/modules/suboptions/netInterfaceOptions.nix
new file mode 100644
index 0000000..7abd4cf
--- /dev/null
+++ b/modules/suboptions/netInterfaceOptions.nix
@@ -0,0 +1,39 @@
+{
+  lib,
+  ...
+}:
+
+{
+  options = {
+    warningThresholdSentBytes = lib.mkOption {
+      type = lib.types.nullOr lib.types.ints.positive;
+      default = null;
+      description = "Sent bytes per second threshold for a warning alert to be sent. If null, this threshold is disabled and not checked.";
+    };
+    criticalThresholdSentBytes = lib.mkOption {
+      type = lib.types.nullOr lib.types.ints.positive;
+      default = null;
+      description = "Sent bytes per second threshold for a critical alert to be sent. If null, this threshold is disabled and not checked.";
+    };
+    warningThresholdRecvBytes = lib.mkOption {
+      type = lib.types.nullOr lib.types.ints.positive;
+      default = null;
+      description = "Received bytes per second threshold for a warning alert to be sent. If null, this threshold is disabled and not checked.";
+    };
+    criticalThresholdRecvBytes = lib.mkOption {
+      type = lib.types.nullOr lib.types.ints.positive;
+      default = null;
+      description = "Received bytes per second threshold for a critical alert to be sent. If null, this threshold is disabled and not checked.";
+    };
+    warningThresholdCombBytes = lib.mkOption {
+      type = lib.types.nullOr lib.types.ints.positive;
+      default = null;
+      description = "Combined (sent + received) bytes per second threshold for a warning alert to be sent. If null, this threshold is disabled and not checked.";
+    };
+    criticalThresholdCombBytes = lib.mkOption {
+      type = lib.types.nullOr lib.types.ints.positive;
+      default = null;
+      description = "Combined (sent + received) bytes per second threshold for a critical alert to be sent. If null, this threshold is disabled and not checked.";
+    };
+  };
+}
diff --git a/modules/suboptions/tempSensorOptions.nix b/modules/suboptions/tempSensorOptions.nix
index 31d72fc..c986fe7 100644
--- a/modules/suboptions/tempSensorOptions.nix
+++ b/modules/suboptions/tempSensorOptions.nix
@@ -16,12 +16,12 @@ let
         description = "Whether this reading is enabled.";
       };
       warningTemp = lib.mkOption {
-        type = lib.types.nullOr lib.types.float;
+        type = lib.types.nullOr lib.types.numbers.positive;
         default = null;
         description = "Warning temperature threshold.";
       };
       criticalTemp = lib.mkOption {
-        type = lib.types.nullOr lib.types.float;
+        type = lib.types.nullOr lib.types.numbers.positive;
         default = null;
         description = "Critical temperature threshold.";
       };
diff --git a/pyproject.toml b/pyproject.toml
index dcb602a..b28402e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -6,6 +6,7 @@ readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
     "alt-utils>=0.0.8",
+    "humanize>=4.12.3",
     "psutil>=7.0.0",
     "telethon>=1.40.0",
 ]
diff --git a/src/lego_monitoring/__init__.py b/src/lego_monitoring/__init__.py
index aafc1ca..655e102 100644
--- a/src/lego_monitoring/__init__.py
+++ b/src/lego_monitoring/__init__.py
@@ -82,6 +82,9 @@ async def async_main():
                 is_reminder=True,
             )
         ],
+        check_sets.NET: [
+            IntervalChecker(checks.NetIOTracker().net_check, interval=datetime.timedelta(minutes=5), persistent=True)
+        ],
     }
 
     checkers = []
diff --git a/src/lego_monitoring/alerting/alert.py b/src/lego_monitoring/alerting/alert.py
index a593d60..88d758b 100644
--- a/src/lego_monitoring/alerting/alert.py
+++ b/src/lego_monitoring/alerting/alert.py
@@ -1,4 +1,5 @@
-from dataclasses import dataclass
+from dataclasses import dataclass, field
+from datetime import datetime
 
 from .enum import AlertType, Severity
 
@@ -8,3 +9,4 @@ class Alert:
     alert_type: AlertType
     message: str
     severity: Severity
+    created: datetime = field(default_factory=datetime.now)
diff --git a/src/lego_monitoring/alerting/enum.py b/src/lego_monitoring/alerting/enum.py
index 003398b..d014145 100644
--- a/src/lego_monitoring/alerting/enum.py
+++ b/src/lego_monitoring/alerting/enum.py
@@ -3,13 +3,16 @@ from enum import IntEnum, StrEnum
 
 class AlertType(StrEnum):
     BOOT = "BOOT"
-    CPU = "CPU"
     ERROR = "ERROR"
+    TEST = "TEST"
+    REMIND = "REMIND"
+
+    CPU = "CPU"
+    NET = "NET"
     RAM = "RAM"
     TEMP = "TEMP"
-    TEST = "TEST"
+
     VULN = "VULN"
-    REMIND = "REMIND"
     # LOGIN = "LOGIN"
     # SMART = "SMART"  # TODO
     # RAID = "RAID"
diff --git a/src/lego_monitoring/alerting/sender.py b/src/lego_monitoring/alerting/sender.py
index b85dbff..53f09ed 100644
--- a/src/lego_monitoring/alerting/sender.py
+++ b/src/lego_monitoring/alerting/sender.py
@@ -18,8 +18,12 @@ async def get_client() -> TelegramClient:
 
 def format_message(alert: Alert, note: str) -> str:
     severity_emoji = SEVERITY_TO_EMOJI[alert.severity]
-    note_formatted = f" - <i>{note}</i>" if note else ""
-    message = f"{severity_emoji} {alert.alert_type} Alert{note_formatted}\n{alert.message}"
+    note_formatted = f"{note}, " if note else ""
+    if "ongoing" in note_formatted:
+        note_formatted += f"since {alert.created.isoformat()}"
+    else:
+        note_formatted += f"at {alert.created.isoformat()}"
+    message = f"{severity_emoji} {alert.alert_type} Alert - <i>{note_formatted}</i>\n{alert.message}"
     return message
 
 
diff --git a/src/lego_monitoring/checks/__init__.py b/src/lego_monitoring/checks/__init__.py
index f076917..62a11da 100644
--- a/src/lego_monitoring/checks/__init__.py
+++ b/src/lego_monitoring/checks/__init__.py
@@ -1,4 +1,5 @@
 from .cpu import cpu_check
+from .net import NetIOTracker
 from .ram import ram_check
 from .remind import remind_check
 from .temp import temp_check
diff --git a/src/lego_monitoring/checks/cpu.py b/src/lego_monitoring/checks/cpu.py
index ae335e9..dc19ecf 100644
--- a/src/lego_monitoring/checks/cpu.py
+++ b/src/lego_monitoring/checks/cpu.py
@@ -10,19 +10,19 @@ IS_TESTING = False
 def cpu_check() -> list[Alert]:
     percentage = cpu_percent()
     config = cvars.config.get().checks.cpu
-    if config.critical_percentage and (IS_TESTING or percentage > config.critical_percentage):
+    if config.critical_percentage and (IS_TESTING or percentage >= config.critical_percentage):
         return [
             Alert(
                 alert_type=AlertType.CPU,
-                message=f"CPU load: {percentage:.2f}% > {config.critical_percentage:.2f}%",
+                message=f"CPU load: {percentage:.2f}% >= {config.critical_percentage:.2f}%",
                 severity=Severity.CRITICAL,
             )
         ]
-    elif config.warning_percentage and (IS_TESTING or percentage > config.warning_percentage):
+    elif config.warning_percentage and (IS_TESTING or percentage >= config.warning_percentage):
         return [
             Alert(
                 alert_type=AlertType.CPU,
-                message=f"CPU load: {percentage:.2f}% > {config.warning_percentage:.2f}%",
+                message=f"CPU load: {percentage:.2f}% >= {config.warning_percentage:.2f}%",
                 severity=Severity.WARNING,
             )
         ]
diff --git a/src/lego_monitoring/checks/net.py b/src/lego_monitoring/checks/net.py
new file mode 100644
index 0000000..62c59c8
--- /dev/null
+++ b/src/lego_monitoring/checks/net.py
@@ -0,0 +1,87 @@
+from dataclasses import dataclass, field
+from typing import Optional
+
+from humanize import naturalsize
+from psutil import net_io_counters
+
+from lego_monitoring.alerting.alert import Alert
+from lego_monitoring.alerting.enum import AlertType, Severity
+from lego_monitoring.core import cvars
+
+IS_TESTING = False
+SECONDS_BETWEEN_CHECKS = 5 * 60
+
+
+@dataclass
+class NetIOTracker:
+    sent_per_interface: dict[str, int] = field(default_factory=dict, init=False)
+    recv_per_interface: dict[str, int] = field(default_factory=dict, init=False)
+
+    @staticmethod
+    def check_threshold(
+        current_stat_bytes_per_sec: float,
+        critical_threshold: Optional[int],
+        warning_threshold: Optional[int],
+        stat_name: str,
+        interface: str,
+    ) -> Optional[Alert]:
+        if critical_threshold and (IS_TESTING or current_stat_bytes_per_sec >= critical_threshold):
+            current_stat_natural = naturalsize(current_stat_bytes_per_sec, binary=True)
+            critical_threshold_natural = naturalsize(critical_threshold, binary=True)
+            return Alert(
+                alert_type=AlertType.NET,
+                message=f"Interface {interface} {stat_name} {current_stat_natural}/s >= {critical_threshold_natural}/s",
+                severity=Severity.CRITICAL,
+            )
+        elif warning_threshold and (IS_TESTING or current_stat_bytes_per_sec >= warning_threshold):
+            current_stat_natural = naturalsize(current_stat_bytes_per_sec, binary=True)
+            warning_threshold_natural = naturalsize(warning_threshold, binary=True)
+            return Alert(
+                alert_type=AlertType.NET,
+                message=f"Interface {interface} {stat_name} {current_stat_natural}/s >= {warning_threshold_natural}/s",
+                severity=Severity.WARNING,
+            )
+
+    def net_check(self) -> list[Alert]:
+        alerts = []
+        current_stats = net_io_counters(pernic=True)
+        config = cvars.config.get().checks.net
+        for interface, thresholds in config.interfaces.items():
+            if interface in self.sent_per_interface and interface in self.recv_per_interface:
+                sent_since_last_check_per_sec = (
+                    current_stats[interface].bytes_sent - self.sent_per_interface[interface]
+                ) / SECONDS_BETWEEN_CHECKS
+                recv_since_last_check_per_sec = (
+                    current_stats[interface].bytes_recv - self.recv_per_interface[interface]
+                ) / SECONDS_BETWEEN_CHECKS
+                comb_since_last_check_per_sec = sent_since_last_check_per_sec + recv_since_last_check_per_sec
+
+                if alert := self.check_threshold(
+                    sent_since_last_check_per_sec,
+                    thresholds.critical_threshold_sent_bytes,
+                    thresholds.warning_threshold_sent_bytes,
+                    "sent",
+                    interface,
+                ):
+                    alerts.append(alert)
+                if alert := self.check_threshold(
+                    recv_since_last_check_per_sec,
+                    thresholds.critical_threshold_recv_bytes,
+                    thresholds.warning_threshold_recv_bytes,
+                    "recv",
+                    interface,
+                ):
+                    alerts.append(alert)
+                if alert := self.check_threshold(
+                    comb_since_last_check_per_sec,
+                    thresholds.critical_threshold_comb_bytes,
+                    thresholds.warning_threshold_comb_bytes,
+                    "comb",
+                    interface,
+                ):
+                    alerts.append(alert)
+
+            self.sent_per_interface[interface] = current_stats[interface].bytes_sent
+            self.recv_per_interface[interface] = current_stats[interface].bytes_recv
+
+        return alerts
diff --git a/src/lego_monitoring/checks/ram.py b/src/lego_monitoring/checks/ram.py
index eff87f7..f1eb40d 100644
--- a/src/lego_monitoring/checks/ram.py
+++ b/src/lego_monitoring/checks/ram.py
@@ -10,19 +10,19 @@ IS_TESTING = False
 def ram_check() -> list[Alert]:
     percentage = virtual_memory().percent
     config = cvars.config.get().checks.ram
-    if config.critical_percentage and (IS_TESTING or percentage > config.critical_percentage):
+    if config.critical_percentage and (IS_TESTING or percentage >= config.critical_percentage):
         return [
             Alert(
                 alert_type=AlertType.RAM,
-                message=f"RAM usage: {percentage:.2f}% > {config.critical_percentage:.2f}%",
+                message=f"RAM usage: {percentage:.2f}% >= {config.critical_percentage:.2f}%",
                 severity=Severity.CRITICAL,
             )
         ]
-    elif config.warning_percentage and (IS_TESTING or percentage > config.warning_percentage):
+    elif config.warning_percentage and (IS_TESTING or percentage >= config.warning_percentage):
         return [
             Alert(
                 alert_type=AlertType.RAM,
-                message=f"RAM usage: {percentage:.2f}% > {config.warning_percentage:.2f}%",
+                message=f"RAM usage: {percentage:.2f}% >= {config.warning_percentage:.2f}%",
                 severity=Severity.WARNING,
             )
         ]
diff --git a/src/lego_monitoring/checks/temp/__init__.py b/src/lego_monitoring/checks/temp/__init__.py
index 9c68a3b..6322a72 100644
--- a/src/lego_monitoring/checks/temp/__init__.py
+++ b/src/lego_monitoring/checks/temp/__init__.py
@@ -11,16 +11,16 @@ def temp_check() -> list[Alert]:
     temps = sensors.get_readings()
     for sensor, readings in temps.items():
         for r in readings:
-            if r.critical_temp is not None and (IS_TESTING or r.current_temp > r.critical_temp):
+            if r.critical_temp is not None and (IS_TESTING or r.current_temp >= r.critical_temp):
                 alert = Alert(
                     alert_type=AlertType.TEMP,
-                    message=f"{sensor} {r.label}: {r.current_temp}°C > {r.critical_temp}°C",
+                    message=f"{sensor} {r.label}: {r.current_temp}°C >= {r.critical_temp}°C",
                     severity=Severity.CRITICAL,
                 )
-            elif r.warning_temp is not None and (IS_TESTING or r.current_temp > r.warning_temp):
+            elif r.warning_temp is not None and (IS_TESTING or r.current_temp >= r.warning_temp):
                 alert = Alert(
                     alert_type=AlertType.TEMP,
-                    message=f"{sensor} {r.label}: {r.current_temp}°C > {r.warning_temp}°C",
+                    message=f"{sensor} {r.label}: {r.current_temp}°C >= {r.warning_temp}°C",
                     severity=Severity.WARNING,
                 )
             else:
diff --git a/src/lego_monitoring/config/__init__.py b/src/lego_monitoring/config/__init__.py
index 3d8917e..4354df8 100644
--- a/src/lego_monitoring/config/__init__.py
+++ b/src/lego_monitoring/config/__init__.py
@@ -6,6 +6,7 @@ from alt_utils import NestedDeserializableDataclass
 
 from . import enums
 from .checks.cpu import CpuCheckConfig
+from .checks.net import NetCheckConfig
 from .checks.ram import RamCheckConfig
 from .checks.temp import TempCheckConfig
 from .checks.vulnix import VulnixCheckConfig
@@ -17,6 +18,7 @@ class ChecksConfig(NestedDeserializableDataclass):
     ram: RamCheckConfig = field(default_factory=RamCheckConfig)
     temp: TempCheckConfig = field(default_factory=TempCheckConfig)
     vulnix: Optional[VulnixCheckConfig] = None  # vulnix check WILL raise if this config section is None
+    net: NetCheckConfig = field(default_factory=NetCheckConfig)
 
 
 @dataclass
diff --git a/src/lego_monitoring/config/checks/net.py b/src/lego_monitoring/config/checks/net.py
new file mode 100644
index 0000000..5da92c9
--- /dev/null
+++ b/src/lego_monitoring/config/checks/net.py
@@ -0,0 +1,19 @@
+from dataclasses import dataclass, field
+from typing import Optional
+
+from alt_utils import NestedDeserializableDataclass
+
+
+@dataclass
+class NetInterfaceConfig:
+    warning_threshold_sent_bytes: Optional[int] = None
+    critical_threshold_sent_bytes: Optional[int] = None
+    warning_threshold_recv_bytes: Optional[int] = None
+    critical_threshold_recv_bytes: Optional[int] = None
+    warning_threshold_comb_bytes: Optional[int] = None
+    critical_threshold_comb_bytes: Optional[int] = None
+
+
+@dataclass
+class NetCheckConfig(NestedDeserializableDataclass):
+    interfaces: dict[str, NetInterfaceConfig] = field(default_factory=dict)
diff --git a/src/lego_monitoring/config/enums.py b/src/lego_monitoring/config/enums.py
index fc3e38e..a020a8b 100644
--- a/src/lego_monitoring/config/enums.py
+++ b/src/lego_monitoring/config/enums.py
@@ -9,6 +9,7 @@ class CheckSet(StrEnum):
     CPU = "cpu"
     RAM = "ram"
     TEMP = "temp"
+    NET = "net"
 
     VULNIX = "vulnix"
 
diff --git a/uv.lock b/uv.lock
index f5ec571..bc590c7 100644
--- a/uv.lock
+++ b/uv.lock
@@ -1,13 +1,23 @@
 version = 1
+revision = 2
 requires-python = ">=3.12"
 
 [[package]]
 name = "alt-utils"
 version = "0.0.8"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/31/15/67246107a8c808a9e99b34fd0024bebe954a67f3c315821eae985b87db7f/alt_utils-0.0.8.tar.gz", hash = "sha256:4b2901df0be4af736210277d58e231d4c4bce597a8fc665a8dd3e7b582705081", size = 6103 }
+sdist = { url = "https://files.pythonhosted.org/packages/31/15/67246107a8c808a9e99b34fd0024bebe954a67f3c315821eae985b87db7f/alt_utils-0.0.8.tar.gz", hash = "sha256:4b2901df0be4af736210277d58e231d4c4bce597a8fc665a8dd3e7b582705081", size = 6103, upload_time = "2025-05-10T19:36:49.187Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/9a/5a/7fe15b55fa0ff5528643750c409cd14da005406aef312b32512d8a8487ab/alt_utils-0.0.8-py3-none-any.whl", hash = "sha256:af5549c49543ff4a02b735308bc2a5bfb7f20755620652fd969a648bbaecbc47", size = 6378 },
+    { url = "https://files.pythonhosted.org/packages/9a/5a/7fe15b55fa0ff5528643750c409cd14da005406aef312b32512d8a8487ab/alt_utils-0.0.8-py3-none-any.whl", hash = "sha256:af5549c49543ff4a02b735308bc2a5bfb7f20755620652fd969a648bbaecbc47", size = 6378, upload_time = "2025-05-10T19:36:47.954Z" },
+]
+
+[[package]]
+name = "humanize"
+version = "4.12.3"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/22/d1/bbc4d251187a43f69844f7fd8941426549bbe4723e8ff0a7441796b0789f/humanize-4.12.3.tar.gz", hash = "sha256:8430be3a615106fdfceb0b2c1b41c4c98c6b0fc5cc59663a5539b111dd325fb0", size = 80514, upload_time = "2025-04-30T11:51:07.98Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/a0/1e/62a2ec3104394a2975a2629eec89276ede9dbe717092f6966fcf963e1bf0/humanize-4.12.3-py3-none-any.whl", hash = "sha256:2cbf6370af06568fa6d2da77c86edb7886f3160ecd19ee1ffef07979efc597f6", size = 128487, upload_time = "2025-04-30T11:51:06.468Z" },
 ]
 
 [[package]]
@@ -16,6 +26,7 @@ version = "0.1.0"
 source = { editable = "." }
 dependencies = [
     { name = "alt-utils" },
+    { name = "humanize" },
     { name = "psutil" },
     { name = "telethon" },
 ]
@@ -23,6 +34,7 @@ dependencies = [
 [package.metadata]
 requires-dist = [
     { name = "alt-utils", specifier = ">=0.0.8" },
+    { name = "humanize", specifier = ">=4.12.3" },
     { name = "psutil", specifier = ">=7.0.0" },
     { name = "telethon", specifier = ">=1.40.0" },
 ]
@@ -31,30 +43,30 @@ requires-dist = [
 name = "psutil"
 version = "7.0.0"
 source = { registry = "https://pypi.org/simple" }
-sdist = { url = "https://files.pythonhosted.org/packages/2a/80/336820c1ad9286a4ded7e845b2eccfcb27851ab8ac6abece774a6ff4d3de/psutil-7.0.0.tar.gz", hash = "sha256:7be9c3eba38beccb6495ea33afd982a44074b78f28c434a1f51cc07fd315c456", size = 497003 }
+sdist = { url = "https://files.pythonhosted.org/packages/2a/80/336820c1ad9286a4ded7e845b2eccfcb27851ab8ac6abece774a6ff4d3de/psutil-7.0.0.tar.gz", hash = "sha256:7be9c3eba38beccb6495ea33afd982a44074b78f28c434a1f51cc07fd315c456", size = 497003, upload_time = "2025-02-13T21:54:07.946Z" }
 wheels = [
-    { url = "https://files.pythonhosted.org/packages/ed/e6/2d26234410f8b8abdbf891c9da62bee396583f713fb9f3325a4760875d22/psutil-7.0.0-cp36-abi3-macosx_10_9_x86_64.whl", hash = "sha256:101d71dc322e3cffd7cea0650b09b3d08b8e7c4109dd6809fe452dfd00e58b25", size = 238051 },
-    { url = "https://files.pythonhosted.org/packages/04/8b/30f930733afe425e3cbfc0e1468a30a18942350c1a8816acfade80c005c4/psutil-7.0.0-cp36-abi3-macosx_11_0_arm64.whl", hash = "sha256:39db632f6bb862eeccf56660871433e111b6ea58f2caea825571951d4b6aa3da", size = 239535 },
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+    { url = "https://files.pythonhosted.org/packages/04/8b/30f930733afe425e3cbfc0e1468a30a18942350c1a8816acfade80c005c4/psutil-7.0.0-cp36-abi3-macosx_11_0_arm64.whl", hash = "sha256:39db632f6bb862eeccf56660871433e111b6ea58f2caea825571951d4b6aa3da", size = 239535, upload_time = "2025-02-13T21:54:16.07Z" },
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+    { url = "https://files.pythonhosted.org/packages/50/1b/6921afe68c74868b4c9fa424dad3be35b095e16687989ebbb50ce4fceb7c/psutil-7.0.0-cp37-abi3-win_amd64.whl", hash = "sha256:4cf3d4eb1aa9b348dec30105c55cd9b7d4629285735a102beb4441e38db90553", size = 244885, upload_time = "2025-02-13T21:54:37.486Z" },
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 name = "pyaes"
 version = "1.6.1"
 source = { registry = "https://pypi.org/simple" }
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+sdist = { url = "https://files.pythonhosted.org/packages/44/66/2c17bae31c906613795711fc78045c285048168919ace2220daa372c7d72/pyaes-1.6.1.tar.gz", hash = "sha256:02c1b1405c38d3c370b085fb952dd8bea3fadcee6411ad99f312cc129c536d8f", size = 28536, upload_time = "2017-09-20T21:17:54.23Z" }
 
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 version = "0.6.1"
 source = { registry = "https://pypi.org/simple" }
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 [[package]]
@@ -64,9 +76,9 @@ source = { registry = "https://pypi.org/simple" }
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@@ -77,7 +89,7 @@ dependencies = [
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