Rogers coax DHCP is broken on DOCSIS 3.1 zzz

check_wan.sh

#!/bin/sh

# Interface to monitor
WAN_INTERFACE="wan"
FAIL_COUNT=0
MAX_FAILS=3
PING_HOST_1="1.1.1.1"
PING_HOST_2="8.8.8.8"

# Lock file path
LOCK_FILE="/tmp/check_wan.lock"

# Function to remove the lock file when the script exits
cleanup() {
    rm -f $LOCK_FILE
}
trap cleanup EXIT

# Check if another instance of the script is already running
if [ -f "$LOCK_FILE" ]; then
    echo "Script is already running. Exiting."
    exit 1
fi

# Create the lock file
touch $LOCK_FILE

# Function to ping a host
ping_host() {
    local host=$1
    ping -c 1 -W 5 $host > /dev/null 2>&1
    return $?
}

# Step 1: Try pinging 1.1.1.1 (Cloudflare DNS)
while [ $FAIL_COUNT -lt $MAX_FAILS ]; do
    ping_host $PING_HOST_1
    if [ $? -eq 0 ]; then
        echo "$PING_HOST_1 is reachable. WAN is up."
        exit 0
    else
        echo "Failed to ping $PING_HOST_1. Fail count: $FAIL_COUNT"
        FAIL_COUNT=$((FAIL_COUNT+1))
        sleep 60  # Wait 60 seconds before retrying
    fi
done

# Step 2: If 1.1.1.1 fails, try pinging 8.8.8.8 (Google DNS)
FAIL_COUNT=0
while [ $FAIL_COUNT -lt 2 ]; do
    ping_host $PING_HOST_2
    if [ $? -eq 0 ]; then
        echo "$PING_HOST_2 is reachable. WAN is up."
        exit 0
    else
        echo "Failed to ping $PING_HOST_2. Fail count: $FAIL_COUNT"
        FAIL_COUNT=$((FAIL_COUNT+1))
        sleep 60  # Wait 60 seconds before retrying
    fi
done

# Step 3: If both hosts fail, bring up the WAN interface
echo "Both $PING_HOST_1 and $PING_HOST_2 are unreachable. Bringing up the WAN interface."
ifup $WAN_INTERFACE