So I got curious and ran autoconf6 and now I can't figure out how to undo the changes that were made. I have tried using smitty to modify the en0 interface but have had no luck getting it back to it's old configuration. The old configuration of the aix 6 box was: en0: flags=5e080863,c0 inet 10.10.30.212 netmask 0xffffff00 broadcast 10.10.30.255 tcp_sendspace 131072 tcp_recvspace 65536 lo0: flags=e08084b inet 127.0.0.1 netmask 0xff000000 broadcast 127.255.255.255 inet6 ::1/0 tcp_sendspace 131072 tcp_recvspace 131072 rfc1323 1 then I ran autoconf6 and it was changed to: en0: flags=5e080863,c0 inet 10.10.30.212 netmask 0xffffff00 broadcast 10.10.30.255 inet6 fe80::214:5eff:fe96:b806/64 tcp_sendspace 131072 tcp_recvspace 65536 sit0: flags=8100041 inet6 ::10.10.30.212/96 lo0: flags=e08084b inet 127.0.0.1 netmask 0xff000000 broadcast 127.255.255.255 inet6 ::1/128 tcp_sendspace 131072 tcp_recvspace 131072 rfc1323 1 Any help would be awesome.