Hi, usually I'd say ip aliasing is no problem. We use it on several servers without any problems. But I have a prob with one server in DMZ which I investigated for hours and don't found any reason for it's behaviour. The machine's IP is x.x.x.251 and has some aliases: eth0:0 = .1 (dns.domain.com), eth0:1 (mail.domain.com), eth0:2 (extra.domain.com). I can ping each ip (from same subnet or other nets) except the .1 address, neither by name nor by ip. Doing a tcpdump on this interface shows no icmp packets for this ip, for others there are packets as expected. It doesn't matter whether I have a specifiy host route for each alias or not. And it's not firewall/nat related because it doesn't work with both shut down, too. Ping this ip or name from the server itself works of course. I don't have any idea why this isn't working. Does anybody have one? Thx, Oliver