Can not tracert any Device or Router from L2 switch ....... but I can ping

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Nov 17th, 2008
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Dear experts,


I have found one strange thing that I can ping the device or router but when I traceroute them than I cant reach atleast first hope...


Is it ok or something wrong with it ?




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Giuseppe Larosa Tue, 11/18/2008 - 00:03
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Hello Patel,

what you see can happen.


Cisco implementation of traceroute uses as probe packets UDP packets destined to an unused high port.


If the first device in the path has the command

no ip unreachable

it blocks the ICMP unreachable that should come back to the probe sender.


So it is possible to ping a device but not being able to traceroute to it



Hope to help

Giuseppe


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