changed MTU, can ping but can't be pinged

[Brian]

had a laptop that had trouble browsing certain web sites - the browser
would just hang or the page would not load (but it would not time out
like it would if the page was not available). Windows XP SP2. on
Watchguard's advice (as this issue arose after putting in a new
Watchguard X20E Firebox firewall) ran Dr. TCP and changed the MTU to
1350. Now the laptop can browse the sites that were a problem.
However, now I cannot get to the laptop through remote desktop, and it
won't respond to a ping. it can ping other PCs, but they can't ping
it. Changed the MTU to 1480 (supposedly the XP default setting) and
1450 and it seems that no matter what we change the MTU to cannot
connect to it.

this device is in a satellite office and I need to connect to it
remotely through our VPN tunnel (which I could do just fine before the
MTU change). their connection is a DSL PPPoE connection.

thanks for any and all help.
Brian

 

[Robert L [MS-MVP]]

I would check the firewall first. Also, are all computers in the same subnet?

Bob Lin, MS-MVP, MCSE & CNE
Networking, Internet, Routing, VPN Troubleshooting on http://www.ChicagoTech.net
How to Setup Windows, Network, VPN & Remote Access on http://www.HowToNetworking.com
had a laptop that had trouble browsing certain web sites - the browser
would just hang or the page would not load (but it would not time out
like it would if the page was not available). Windows XP SP2. on
Watchguard's advice (as this issue arose after putting in a new
Watchguard X20E Firebox firewall) ran Dr. TCP and changed the MTU to
1350. Now the laptop can browse the sites that were a problem.
However, now I cannot get to the laptop through remote desktop, and it
won't respond to a ping. it can ping other PCs, but they can't ping
it. Changed the MTU to 1480 (supposedly the XP default setting) and
1450 and it seems that no matter what we change the MTU to cannot
connect to it.

this device is in a satellite office and I need to connect to it
remotely through our VPN tunnel (which I could do just fine before the
MTU change). their connection is a DSL PPPoE connection.

thanks for any and all help.
Brian