Re: Wierd network
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 Get free email and a permanent address at http://www.netaddress.com/?N=1 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] ___ Visit http://www.visto.com/info, your free web-based communications center. Visto.com. Life on the Dot. _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Wierd network
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 Get free email and a permanent address at http://www.netaddress.com/?N=1 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
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 Get free email and a permanent address at http://www.netaddress.com/?N=1 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] Priscilla Oppenheimer http://www.priscilla.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
RE: Wierd network
I wish I could say that I've never seen such a thing. I had an instance one time in a lab when we had two routers connected back to back via a serial cable. They were on the same subnet and had layer one and two connectivity (up, up). A show cdp neigh verified this. However, they could not ping each other - no layer three! Shut the interfaces down and brought them back up and voila! Another undocumented feature sarcasm inserted. Roman -Original Message- From: Charles Nunie [mailto:[EMAIL PROTECTED]] Sent: Saturday, December 23, 2000 7:59 AM To: [EMAIL PROTECTED] Subject: Wierd network 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 Get free email and a permanent address at http://www.netaddress.com/?N=1 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
Re: Wierd network
Hi, This seems like it may have had some ARP cache stuff lying about. Sometimes you need to reset servers etc whenreplacing routers as the ARP caches hold the old MAC Addresses for the IP Addresses. Teunis, Hobart, Tasmania Australia On Saturday, December 23, 2000 at 06:59:12 AM, 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 Get free email and a permanent address at http://www.netaddress.com/?N=1 _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED] -- www.tasmail.com _ FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
