We have a gateway machine that's used as the DNS server, router and firewall for our LAN. It has two ethernet cards(eth0 and eth1) One(eth1) is local the other is to the outside(eth0). We have a firewall to the outside. On this same machine I installed dhcp2.0.5 rpm(which works just fine), but soon after I did I couldn't telnet or ftp to this machine...at least not locally(through eth1). If I telnet to the outside and then try to telnet back in it works just fine. To me it looks like a firewall problem, yet it shouldn't be since I didn't change any firewall settings. What i did do wrong is put in this machine's IP address in the range of addresses for the DHCP server. I suspect this did something, I don't know what. After that I tried removing the dhcp package, which incidentally caused problems in linuxconf, but that's all been resolved.