After I put my new router in (Linksys WRT54GL), my Centos 5 pc is very slow to connect when I SCP or SSH somewhere. Or when I ssh into it from my xp box. It seems fast enough after I connect, but the initial connection takes around 10 seconds or so. It used to just be like instant.

try this ..
im guessing they are on the same subnet right ?
ping centos ip address then ssh to your centos box
Is it faster now ?

Pinging 192.168.1.120 with 32 bytes of data:

Reply from 192.168.1.120: bytes=32 time<1ms TTL=64
Reply from 192.168.1.120: bytes=32 time<1ms TTL=64
Reply from 192.168.1.120: bytes=32 time<1ms TTL=64
Reply from 192.168.1.120: bytes=32 time<1ms TTL=64

Ping statistics for 192.168.1.120:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms

It might be a little faster sshing into it now, but once I'm logged in to the centos box, and I try to ssh out to a remote server, it's still very slow to connect.

What's the layout of the network we're talking about, is that
router also the DNS & DHCP server for that network? Has the
Centos box (if it uses DHCP) received a new lease since the
swap?



Cheers,
Tink

try to remove extra nameservers from resolv.conf its the culprit at most.

I changed my DNS servers and restarted and it works! I think what happened is, when I put the new router in I got a new IP address. And the IP was on a different whateveritscalled- you know, the first numbers of the four sets of numbers, was different. So I used the same DNS servers that my windows box automatically got and now it's faster again.

Slow ssh prompts are usually the cause of poor reverse DNS.