Did anyone do any network traces to help pin down the problem? Thomas W Shinder, M.D. Site: www.isaserver.org Blog: http://blogs.isaserver.org/shinder/ Book: http://tinyurl.com/3xqb7 MVP -- ISA Firewalls > -----Original Message----- > From: isapros-bounce@xxxxxxxxxxxxx > [mailto:isapros-bounce@xxxxxxxxxxxxx] On Behalf Of Greg Mulholland > Sent: Wednesday, July 19, 2006 4:54 PM > To: isapros@xxxxxxxxxxxxx > Subject: [isapros] OT:Network Porblems > > OK i need some eyes on this one and since jim asked an > exchange question ill > take a stab. > > Previously the client had a 2mb Internet link with ye olde > cisco router, two > vlans. Two weeks ago they upgraded to a 4mb link with a brand > spanker of a > new cisco router, same 2 vlans. The cabling system was all the same > basically i had to do was pull the cables out from the old > router and stick > them into the new router, reconfigure the dhcp scopes and any > static devies > on the networks and all is good. Well vlan1 has worked a > treat since, which > brings me to vlan2. > > The client reported "no internet access" a while ago after a > bit of trouble > shooting and a cut to the chase the guys who manage the > router (externally) > tell me they are seeing 3-6 million input errors on vlan2's > interface log. > Rebooting the single switch attached to vlan2 fixes the > problem as it resets > the int but the errors will start occuring shortly after and > eventually > flood the interface and it drops again. > > OK so they tell me that its something on the vlan2 network > thats causing it, > i on the phone with the router guy one by one shutdown each > device then > unplug each cable from the switch then turn everything back > on one by one, > hoping he will say "ahh there it is what did you just turn > on". Mind you i > thought it is a long shot that one pc could genearate that > much traffic. > Anyhow i borrowed another switch of the same model and > plugged that in for > two days, same problem, i tried a different make swicth, same > problem, we > replaced the cables between the rooms as they are separated > by some 40 mtrs, > all the small patach cables, cables on the router, had them > out the other > day to reconfigure the interface and replace the four port > module, still the > same!!!!!!! Last night we turned everything off bar the > switch with the link > cable to the router plugged in and the router itself and its > still the same. > we have ordered a brand new switch which every network gets > given with this > setup, all configured to their specs in the hope that maybe > one day someone > screwed with ours and didnt document it. If that doesnt fix > it im lost. Has > anyone got any more ideas. > > My guts feeling is somethig the router guy told me the other > day in that he > had to force the router to 100half because that what the > swicth was telling > him it had, yet the swicth was all autosensing. I keep > thinking that its a > speed mismatch which can cause the links to drop. They reckon > its not but i > have my doubts > > If anyone has got any ideas, stupid or otherwise im all ears. > > Thanks Heaps > Greg > > p.s the pcs have been scanned for viruses and spyware before > i got to this > stage. > > > >