NB: I didn't see Carlos' posting until after I posted mine. If you work with something like extended ping, on a Cisco device, you can set the desired DSCP value, by setting the ToS byte to 4 times the decimal DSCP value. For example, if you were attempting to get a packet capture of pings hitting the NetVanta WAN IP, and pings were being blocked on the firewall, you would still see the packet hit the router and in your debug before the firewall dropped it. What can be confusing, DSCP is the first 6 bits of the ToS byte, so you numeric values for DSCP CS4 is 32 but the ToS byte value is 0x80.Īlso the first 3 bits of the ToS byte also provides the old IPPrec values, in this case, IPPrec is 4.įor DSCP EF, the decimal value of the first six bits would be 46, but the the ToS byte value would be 0xb8. To answer your question, the packet capture will show the packet before the firewall takes any action on it. You probably want to analyze the traffic going through your. In no event shall Author be liable for any damages wha2tsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage. You will now see a pop-up window on your screen. Usage of this posting's information is solely at reader's own risk. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. If you need to see exactly what Certificates are being exchanged between things over the network, Wireshark has the answers.
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