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#!/bin/bash
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# Detects the most likely WAN interface and prints it
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# Look for interface with default route
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WAN_IF=$(ip route | awk '/default/ {print $5}' | head -n 1)
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if [ -z "$WAN_IF" ]; then
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echo "Could not detect WAN interface." >&2
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exit 1
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fi
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echo "$WAN_IF"
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