[afnog] Cisco 2600 series router

[Noah Sematimba]

Well,

I experienced similar problems with a Redhat linux machine connected  
to a LAN and actually tried all those solutions and others in  
puzzlement you have only to find out later that there was some windows  
virus spreading around the network that was hijacking mac addresses on  
the network and naturally the linux machine being a firewall and mail  
server that every machine on the network was accessing, its mac  
address was always among the first to get hijacked. Strangely enough  
the windows machines kept working despite the problems.

It was only using tcpdump that allowed me to figure out the problem.

YMMV, but you could check for this.

Noah.
On Dec 11, 2008, at 10:15 AM, Hyeroba Peter wrote:

> Hi guys,
>
> I have a cisco 2600 series that behaves weird.
>
> First of all, it would move from full duplex mode on its Eth0  
> interface to
> half duplex and then back, yet there have been no new hardware added  
> to the
> network that would cause this switch. After the switch, I could not  
> ping it
> from my local network i.e. its attached to a 24 port 3com switch.  
> But if I
> got a laptop and connected it directly to the router's Eth0 port,  
> it'd work
> fine, but attaching the router to the switches and then trying to  
> ping or
> use it as a gateway, it doesn't work at all, i.e. I cannot ping the  
> router
> or use it as a gateway. I solved this initially by connecting the  
> router to
> an old 3com switch which was full time half-duplex, this worked for  
> a while
> till 2days ago. Now it cant sync with any other devices on the network
> unless given its own switch.
>
> Has any of you experienced such.
>
>
>
> Hyeroba W. Peter
> Computer Frontiers International limited;
> Tel: +256 31 230 1800 or +254 41 456 4200; Fax: +256 41 434 0456;
> Cell-phone: +256 78 247 9192;
> Website: www.cfi.co.ug
>
>
>
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