I want to check the physical packet as it reaches its destination. I know I could do this with ethereal but i'm not sure what I need to look for in the TCP packet
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Cisco QoS IP Precedence
Hi All,
Just configure QoS across 2 Cisco routers to mark the IP precedence 5 bit in the packet headed. Whats the easiest way to check if this is working and that the IP precedence bit has not been stripped out?
Thanks
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Answers
If if you're checking the actual packets, you'll want to capture some of the traffic with etherreal, look at a TCP packet for example (UDP as well) and options you'll see in etherreal is "internet protocol" then the source address and the destination address of that packet. Under Internet protocol, click the + to expand it down, it'll show you things like version (4), header length and Differentiated Services field. This DSCP field is what you want to look at. The DSCP field is an expansion of the IP Precedence value, adds 3 bytes. Look at http://www.ciscopress.com/
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by: rpalmeira22Posted on 2007-09-26 at 16:55:02ID: 19967858
Depends on how you want to check it. if you want to be sure you're marking packets correctly you're going to have to capture some of the traffic and make sure the flag is set correctly. If you just want to make sure the priority queues are setup correctly you can do that on the router. Ideally, what are you looking to check?