find me the gateway ips

utils/capture-ips.sh

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+ip="$(curl -s ipinfo.io/ip)"
+interface="$(ip addr | awk -v ip="$ip" '$1 == "inet" && $2 ~ "^" ip "/" {print $NF}')"
+
+TMPFILE=$(mktemp)
+
+timeout 10 tcpdump -i $interface "port ${1:-3042}" -n -q 2> /dev/null | awk '{print $3}' | cut -d '.' -f1-4 | grep -v "$ip" > $TMPFILE
+RESULT=$(cat $TMPFILE | sort -u | grep -v '^$')
+
+rm "$TMPFILE"
+
+echo "$RESULT"