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CISCO Sniffing for dropped packets?

Posted on 2008-11-13
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We are having an issue with beieving that UDP packets are being dropped through our VPN despite articles from this link. http://support.microsoft.com/kb/244474

I personally don't think this is an issue with UDP packets through all VPN's so making the switch without current issues or justification is a stupid waste of time in my oppinion.

I need to convince a network admin to somehow analyze traffic through the VPN for dropped UDP packets in order to justify this.

Can someone give describe in their own words or provide a link that describes how to do this?

That would be very helpfull. Thanks a bunch.

:)
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Question by:snyderkv
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jjmartineziii earned 2000 total points
ID: 22952166
You can SPAN a port, range of ports, or VLAN's on Cisco switches. On the destination port, you should run a packet sniffing software like Wireshark.

A simple configuration would be:
Switch(config)# monitor session 1 source interface fastEthernet0/1
Switch(config)# monitor session 1 destination interface fastEthernet0/10


assuming the traffic you want to sniff is on fa0/1 and the wiresnifer is on fa 0/10.
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by:snyderkv
ID: 22955038
Thanks

I don't know this tool but would I be correct to say the next step would be to filter for dropped UDP packets or do you know a better way to put this considering the tools options? As you figured out I won't be doing it myself. I just need the buz words.
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by:jjmartineziii
ID: 22959897
Now that I think about it, I don't know how you would see dropped packets if they are dropped...I'm not sure what you are trying to do is possible.
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