Packets heading out die at routed interface

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Feb 22nd, 2008
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I have detected an intermitted incident on my network that has been tough to pin down. From time to time, certain WinXP client machines report the a loss of connectivity to the internet. Apon a tracert to say, the tracert dies at a routed interface on 3750G 48 port switch., which is in a 4 switch stack. This routed interface is connected to a 2811 that is connected to my 100MB metro E connections from my HQ office. When the incident is occurring, other users on the same network segment are completely operational. When a client is reporting the trouble, as stated, the tracert will die at the switche's routed interface, however, a tracert to an internal destination will be successful.

Restated, i have seen tracerts fail from x.x.7.85, while at the same exact moment in time the tracert will succeed from x.x.7.30. to the same location. A ping will also fail at these moments as wll. I have verifed the the firewall is not recieving and then dropping the packets. My route in the switch to is a staic route pointing to ip of the clustered firewall.

Any thoughts?


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jorg.ramakers Fri, 02/29/2008 - 07:18
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Hi Tendter15

Are both client in different vlans? So check if the firewall is understanding 802.1q (vlan tagging) otherwise the firewall doesn't understand the different vlan except vlan 1 (as this is untagged)


tendter15 Fri, 02/29/2008 - 09:30
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Both clients are on the same vlan, but are connected to differnet access level switches. Could a recently added switch cause this type of issue?


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