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RBH
Apprentice
Joined: 31 Oct 2004
Posts: 184
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 Posted: Mon Nov 02, 2009 11:01 am Post subject: Find the throttling router |
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I've noticed over the past few days that any rsync traffic is getting throttled down to about 700b/s (yes, bytes/sec) after about 5 seconds of download. My ISP claims they have no such traffic rules in place, but I'm not entirely convinced.
Is there a way to find which router is throttling me? |
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malern
Apprentice
Joined: 19 Oct 2006
Posts: 170
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| Posted: Mon Nov 02, 2009 12:05 pm Post subject: Re: Find the throttling router |
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| RBH wrote: | | Is there a way to find which router is throttling me? |
Depends how they are throttling you. If they are simply dropping packets from you then that would show up pretty clearly using traceroute. If they are only dropping packets destined a specific tcp port you can use net-analyzer/tcptraceroute to detect that. If they are filtering on even more specific criteria then a tool like net-analyzer/hping will let you send more custom packets and view the responses.
Another way of throttling would be for them to spoof packets which set a small tcp window size. If you have root access on both the client and the server then you can check this by running a tool like tcpdump on both and comparing the output to see if anything was altered, or if one side received any packets that the other didn't send. If this is the case then it can be very hard to track down the router that is doing it (as it is spoofing its ip address), but the TTL can sometimes give it away. |
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