OK,
Here's another one for you experts out there. We've got a 24 port hub/switch in telehouse which is connected to a router. We've got several machines connected up and they are running great. No problems. Excellent connectivity.
One of our guys goes down to London yesterday and swops a network card in one of the boxes and installs a fresh new RedHat box in the cabinet for us to play with. Things start to go weird..
The box with the new network card in it and the totally new box can see all the other machines on the subnet and they can see each other. Fine up to now.
So..
I try to telnet into these boxes from home (NTL dialup modem) and can't access them. I can access all the other machines on that subnet no problem but not those two machines.
In addition, those two machines can't see the router that's attached to the hub.
I'm running no clever firewalling or anything on any of those machines.
My thoughts are that the switch is misbehaving and is about to smoke or that the router is selectively ignoring certain addresses...
Any other thoughts on this?
Cheers.
Mark W.