[isapros] Re: OT:Network Porblems
- From: "Thomas W Shinder" <tshinder@xxxxxxxxxxx>
- To: <isapros@xxxxxxxxxxxxx>
- Date: Wed, 19 Jul 2006 21:59:37 -0500
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.
>
>
>
>
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