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#!/bin/sh
ENDPOINT=129.100.33.20
case "$2" in
up|dhcp4-change)
route=$(ip -4 route show default | awk 'NR==1')
gateway=$(echo "$route" | awk '{for (i=1;i<=NF;i++) if ($i=="via") print $(i+1)}')
device=$(echo "$route" | awk '{for (i=1;i<=NF;i++) if ($i=="dev") print $(i+1)}')
if [ -n "$gateway" ] && [ -n "$device" ]; then
ip -4 route replace "$ENDPOINT/32" via "$gateway" dev "$device"
fi
;;
esac