OpenBSD box returning wrong IP

adiavr_at_gmail.com
Date: 03/29/05 

Date: 29 Mar 2005 11:40:22 -0800

Our OpenBSD gateway has an IP address of 192.168.0.254. Recently I
added an alias on the interface for 192.168.215.254. Now everytime I
do a traceroute from a computer sitting on 192.168.0.x (which has
default gateway 192.168.0.254), the firewall returns the
192.168.215.254 first hop address. Any idea what causes this?