pfSense

I created a gateway with the LAN IP address, and a remote machine's IP (reachable via an IPSEC tunnel) to monitor the health of the tunnel.

When pinging the remote machine from the LAN, every ping will throw an additional redirect. Most machines will simply ignore this, but a voice device did not and further on tried to resolve the remote machine's MAC using arp-who-has because it was redirected away from the std-gw.

I didn't expect any side effects from a gateway definition until it's actually used. Specifically, I wonder what this redirect should be good for.

Worse: the redirect happens even if the gateway entry is disabled. Only way to stop is deleting, or setting net.inet.ip.redirect=0