troubleshooting Question

QoS, TOS value, ping tool, cisco site-to-site!

Avatar of andrewprouse
andrewprouse asked on
RoutersVoice Over IPTCP/IP
4 Comments1 Solution3671 ViewsLast Modified:
I'm struggling with a QoS problem at the moment and need a tool to help me test it.

I need to be able to ping a device and classify the data with a TOS value (184).

We have a Cisco site-to-site link working perfectly, but I'm trying to prioritise voice traffic between two voice servers (non cisco - one at each site).  The voice servers are apparently tagging all inter-site traffic with a TOS value of 184 (tos=0xB8).  I've created a policy-map to match outgoing DSCP EF traffic on the WAN interfaces, but I don't seem to be getting any matches when I make an inter-site voice call.

If I use a Cisco Wireless Access Point to run an extended ping and input the TOS value of 184 then I get matches so I know that the router policy-map is working correctly. The thing I don't know is if the Cisco routers can only detect Cisco traffic.  I need a ping tool where I can set a TOS value to the ICMP traffic to see if I get matches.

I've tried a ping from an XP machine where the ping -v command is supported, and this traffic doesn't 'match' in the policy-map.

I'm also trying to find a way to capture the packets to and from each voice server to see if the packets are actually tagged with the correct TOS value.  Any ideas how to do this? (I have wireshark but can't seem to work out how to monitor a remote device).

Any ideas?

Cheers, Andy
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