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Use of pathping for VOIP troubleshooting?

Posted on 2011-10-13
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Has anyone successfully used pathping to troubleshoot voip problems?

what switches did you use?
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Question by:Dragon0x40
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eeRoot earned 2000 total points
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Sometimes, on networks where there is one really slow ro bad link that stands out due to high ping response times or lost packets.  But on many networks, ICMP traffic is handled differently then VOIP traffic due to the QOS and ACL configurations.  So good or bad ping times does not necessarily imply good or bad VOIP quality.  There are utilities designed to measure jitter, which what you really need to know when dealing with VOIP.  Also, the IO graph and flow graph in wireshark can be useful, because you can monitor the actual VOIP packets.

The type of switch shouldn't matter, as long as it's configured correctly.
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by:Dragon0x40
ID: 36963546
Pathping has command line switches. pathping -T places a layer 2 cos value but I think we only use layer 3 DSCP so I don't know if the -T switch would be useful. Maybe -R for RSVP might be a better option.

http://technet.microsoft.com/en-us/library/cc958876.aspx
Switch
 Name
 Function
 
-n
 Host names
 Does not resolve addresses to host names.
 
-h < Max hops >
 Maximum hops
 Maximum number of hops to search for target.
 
-g < destination address > < router IP addresses or NetBIOS names >
 Router -list
 Use a loose source route along host-list.
 
-p < milliseconds >
 Period
 Number of milliseconds to wait between pings.
 
-q < Number queries >
 Num_queries
 Number of queries per hop.
 
-R
 RSVP test
 Checks to see if each router in the path supports the Resource Reservation Protocol (RSVP), which allows the host computer to reserve a certain amount of bandwidth for a data stream. The -R switch is used to test for Quality of Service (QoS) connectivity.
 
-T
 Layer 2 tag
 Attaches a layer 2 priority tag (for example, for IEEE 802.1p) to the packets and sends it to each of the network devices in the path. This helps in identifying the network devices that do not have layer 2 priority configured properly. The -T switch is used to test for Quality of Service (QoS) connectivity.
 
-w < milliseconds >
 Time-out
 Waits this many milliseconds for each reply.

I just found out that my windows 7 pro computer does not support the -T or -R tags that are listed on Microsoft website

C:\Users\xxxxx>pathping 10.1.1.1 -R
-R is not a valid command option.

Usage: pathping [-g host-list] [-h maximum_hops] [-i address] [-n]
                [-p period] [-q num_queries] [-w timeout]
                [-4] [-6] target_name

Options:
    -g host-list     Loose source route along host-list.
    -h maximum_hops  Maximum number of hops to search for target.
    -i address       Use the specified source address.
    -n               Do not resolve addresses to hostnames.
    -p period        Wait period milliseconds between pings.
    -q num_queries   Number of queries per hop.
    -w timeout       Wait timeout milliseconds for each reply.
    -4               Force using IPv4.
    -6               Force using IPv6.

 
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