The servers had "learnt" the old Routers MAC address. when you connected the new 
Routers , the Server still has the old MAC with it. The Server obviously fired after 
it learnt the new MAC.

You would get a similar issue when you suddenly disable a Server from your server Farm 
or connect a new server.

The situation can get "aggravated "  if there is VRRP/HSRP configured and you take out 
say, one Router or one server or add a server. you can get  a  " site down " issue. I 
had a case like this.Emptied the arp cache and the site was up. The customer sent a " 
you saved my job" email.:-) 

In such cases, one safe bet is to empty the arp cache.A good practice is to check the 
arp entries after your install.

PS: Though the issue is clear from Priscillas mail, the above is field experience 
shared with you ALL.

Regards
-PK



-----Original Message-----
From:    Priscilla Oppenheimer [EMAIL PROTECTED]
Sent:    Sat, 23 Dec 2000 11:29:14 -0800
To:      [EMAIL PROTECTED], [EMAIL PROTECTED]
Subject: Re: Wierd network


Could the ARP cache on the server have finally timed out? Perhaps the 
server  had learned the MAC address of the old router for all remote 
devices. This assumes the router was doing proxy ARP, which is the default, 
and that the server was ARPing for remote devices, which happens under 
certain configurations. Presumably the new router had a different MAC 
address, but the server didn't figure this out until its ARP cache timed out.

Priscilla

At 06:59 AM 12/23/00, Charles Nunie wrote:
>Hi everyone,
>
>We have this network setup linking two offices. There was a link failure and
>we had to replace the routers. The same settings were used but.....!!!!
>
>The server cannot ping across the network (only the immediate router
>interface). All workstations can ping across and some were also working off
>this same server. The server was isolated and its IP used on a laptop could go
>across!!.
>
>The server, routers and everything was working the night before the breakdown
>and everything had been reset.
>
>Its working now but, what caused it?  It just came up after about 3 hours.
>
>Regards,
>
>Dzilo
>
>
>
>____________________________________________________________________
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________________________

Priscilla Oppenheimer
http://www.priscilla.com

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