HOW-TO: Forward outgoing traffic to a pool of remote IPs.

Use the rdr/filter rules below, and make your client connect on localhost (127.0.0.1).

===

obediance# cat > /etc/pf.conf << EOF
rdr on lo0 inet proto udp to port 5060 -> {REMOTE_IP_1, REMOTE_IP_2} round-robin

pass
pass in on lo0 route-to (em0 EXTERNAL_IF_GATEWAY_IP) inet proto udp to port 5060
EOF
obediance# pfctl -ef /etc/pf.conf