>> And if you do: >> ifconfig lo0 192.168.127.26 netmask 255.255.255.255 alias >Same thing. When I set with ifconfig, it works. When I set with my >program, using SIOCAIFADDR, it doesn't work, even if the output from >netstat -rn and ifconfig -A lo0 is exactly the same. if you could post your program somewhere someone could debug it. itojun