Not sure if this is the right place. Our WAN consisted of the following ranges:
10.100.120.0-10.100.120.255
10.100.121.0-10.100.121.255

this worked fine until we ran out of IP's. I have been forced to use 10.100.117 as the new subnet. Our switches/routers are all set up for the new subnet. I am giving out DHCP request to this subnet without any problems.

mask for all 3 is 255.255.254.0 - this was given by a proper network techy

But, when a PC with the new 117.x range opens a document from a file share, it can take 1-2 minutes for a 1Meg file.

pings take much longer - 128-256 ms instaead of the instant responses when on the 120/121 range

I am running a mixed Windows 2000/2003 domain with Active Directory - this is set up as a single site.

Any ideas as to where else I can look - as you can see I'm not a networky guru.

thanks