Daniel, thanks heaps and heaps, that worked. You just saved me probably at least half a days grief. Looks like I only needed to turn off fast-switching on the relevant dialer interface.
I think the quick and dirty fix in this instance will do fine - I don't think process switching over a PSTN line will contribute a lot to processor load or latency... Definitely one for me to keep in mind. JMcL Daniel Cotts wrote: > > Try turning off fast switching. Several years ago with early > 12.0 code a > similar problem existed with 2600s. The first ping would > succeed because it > was process switched. All subsequent pings would fail. Wait > five minutes for > the cache to clear and again the first ping would work. The > "quick and > dirty" fix was to disable fast switching. The real fix was to > update IOS. > The problem that you are describing seems different from the > above - but > maybe it's a starting point. Try using "sh int stat" and "sh > int switching" > and other show commands to watch for traffic. > > > -----Original Message----- > > From: Jenny McLeod [mailto:[EMAIL PROTECTED]] > > Sent: Wednesday, July 31, 2002 4:16 AM > > To: [EMAIL PROTECTED] > > Subject: Strange ping failures [7:50249] > > > > > > Hi all, > > I have just been battling a rather odd routing(?) problem. > > > > I have a 2621XM router, which has an ethernet segment > > attached. This router > > is connected to an AS5300 via a modem connected to the aux > > port. The AS5300 > > has other connections. Both routers have loopback interfaces > > configured. > > > > Setup... > > > > Fa0/0--RTA--Aux--modem----AS5300--Fa0--lots of other stuff > > > > Routing is basically via static routes, because this is > actually the > > failover connection - RTA also has an ISDN connection via a > > BRI interface > > that, at the time of the problem, was (deliberately) down. > > > > Problem is, that I can ping from the AS5300 to the loopback > > of RTA, or even > > to the FA0/0 ip address, but I can't (usually) ping to any > > hosts on the > > Fa0/0 subnet. Nor can I ping from a PC on the RTA Fa0/0 > > subnet to the AS5300. > > > > Weird thing? If I clear the IP routes on RTA, the next ping > > (or two, on one > > occasion) works. Then they start failing again. The pings > > that work have > > reasonably short response times, and even if I extend the > > timeouts on the > > failing pings to 20 seconds they don't work, so I don't think > > it's a timeout > > problem. > > > > I think I've seen this or read about this somewhere - it's > > niggling at my > > brain. But I can't work out what the heck is going on, and > > my brain is now > > fried. Any hints?? > > > > (If you're really interested in the ip addressing, I'll post > it, but > > according to the routing tables there is a path all the way > > there and all > > the way back). > > > > JMcL > > Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=50324&t=50249 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
