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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: 92 Byte ICMP Blocking Problem
Once upon a time, Richard J.Sears <[email protected]> said: > Since then, we have been hammered with customer complaints concerning > the inability to talk to mail servers and ssh to their servers, as well > as other weird network issues, all centering around the time we started > blocking 92 Byte ICMP packets. > > Has anyone else seen this, and if so, is the only resolution to stop the > blockage of 92 Byte ICMP Packets..? Yes. As soon as we put the policy route map in place, we had some people unable to talk via SSH, SMTP, or POP3. It was random: one person here in the office couldn't SSH to a particular server. He could SSH to other servers, and the rest of us could SSH to the server he could not. We had similar experiences with SMTP and POP3. When we took the policy route map back out, the problems went away. This is with IOS 12.0(25)S1 on a 7513 doing dCEF. We put the policy route map on the FE interface linking this router to the POP core router; this router has MC-T3 interfaces and ethernets to Ascend TNTs and such. The intent was to stop the 92 byte ICMP echos from reaching the Ascend TNTs, since several of them were rebooting constantly. -- Chris Adams <[email protected]> Systems and Network Administrator - HiWAAY Internet Services I don't speak for anybody but myself - that's enough trouble.
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