Ping and Trace problem

Unanswered Question
Feb 24th, 2010
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Hi,


Vlan 70 and vlan 83 exist on 6513 floor switch 1 . This floor switch is tied to core switch 2. I have attached a Diagram of the scenario.


SVI for vlan 70 and 83 sit on Core 1.

My workstation is on vlan 70 and when i do a ping to a workstaion on vlan 83 it works but when i do a trace to the  same desktop on vlan 83 it stops on Core 1  and i dont see the trace going to hte workstation


Can anybody explain why this is hapenning.



Thanks

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Edison Ortiz Wed, 02/24/2010 - 20:18
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Do you have no ip unreachables enabled on any of the SVIs?

gurkamal01 Thu, 02/25/2010 - 05:35
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Hi Ediison,



"No IP unreachables " is not enabled on any of the SVI's



Thanks

milan.kulik Thu, 02/25/2010 - 05:41
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Hi,


any personal Fw involved on the PCs?


BR,

Milan

gurkamal01 Thu, 02/25/2010 - 06:12
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Hi


I can ping the Workstation but trace doesn't work

i have question aren't ping and trace both the same (ICMP)

KARUPPUCHAMY MA... Thu, 02/25/2010 - 06:19
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Hi,


ping is working with ICMP and trace is working with UDP packets.


can you check is there any desktop firewall in your both workstations.


regards

karuppu

milan.kulik Thu, 02/25/2010 - 06:40
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Hi,


Cisco trace is using UDP but Microsoft tracert is using ICMP.

The difference between Ping and traceroute then is the traceroute works with TTL - it sends packets with TTL=1, 2, 3,...

And the routers on the path are replying with ICMP "TTL expired" responses.

The target device should respond with a different ICMP message (Host unreachable, I think) though.


BR,

Milan

gurkamal01 Thu, 02/25/2010 - 06:57
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Hi,


you mean if i can ping the workstation the firewall is stopping trace packets (UDP)

Is this possible?

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