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Traceroute Oddity

Posted on 2003-12-11
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Last Modified: 2012-05-04
We are setting up a WAN to cover a bunch of small communities and up to this point we have had no problem. In this last community, we have a router(x.x.x.225) which plugs into a Wilan wireless ethernet bridge(root=x.x.x.226,child=x.x.x.227) and the child radio plugs into an entry point on the customers network(x.x.x.228). Now the customer is complaining that he is having the problems downloading and webpages load sometimes but not others, so it sounds like he is getting dropped packets. The only really odd thing I can find is when I do a traceroute to x.x.x.227 I get 14 hops but when i do a traceroute to x.x.x.228 I get about 24 hops. The IPs in the root and child radios are for management purposes only, normally the bridge is transparent. Does anyone have any ideas?
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Question by:turbo_inside
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by:qwaletee
ID: 9920964
That is really odd.  Are you saying on the "child" network, that tracert to the entry point takes more hops than to the child radio connected to that entry point?  Or that on the "root" network, you get lots fewer hops to the far side of the bridge, than to the point the bridge is connected to, which should be just one hop ALWAYS?
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by:turbo_inside
ID: 9920984
It is 14 hops to the child radio(the radio on the clients premises) and 24 hops to the clients gateway.
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by:snerkel
ID: 9922829
Surely tracert is giving the IP addresses along the way, so this should give you a clue
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by:turbo_inside
ID: 9922948
thats just it, the unknown hops are all No Response
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by:snerkel
ID: 9923156
You say about 24 hops, is it a consistent number of hops or does it change slightly from time to time.

Do you have access to the child radio, so that you could replace with a PC and try you tracert both ways, this would at least narrow down if it is your hardware, their hardware or some sort of routing issue.

You could also try ping x.x.x.228 -l 500 -f

This should have no problems, gradually increase value until fails at around 1400, it could be file fragmentation but tracert uses such small packets if it is affected then something else is wrong
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by:turbo_inside
ID: 9929718
Sorry, I double checked and its consistently 26 hops. Also it has nothing to do with packet fragmentation as far as i can see. Lastly, the area where this is setup is about 300km away so I cant easily replace the radio with a PC to do traceroute tests.
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snerkel earned 125 total points
ID: 9937147
Another point, from tracert I assume you are doing it from your end and client is doing it from their end, so both of you should have recognisable IP(s) at either end of tracert with a blackhole somewhere around the middle, does that not give some clues?
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by:turbo_inside
ID: 9967020
The client said he was able to tracert to a number of sites that i named without the same problem but i continually get this problem.
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by:turbo_inside
ID: 10062144
It doesnt look like anything is working so I will have to pursue other means but thank you for your help those were some good suggestions.
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by:snerkel
ID: 10064867
Thanks for the points, would be nice to know by posting here if you find solution.
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