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Standard User Banger
(eat-sleep-adslguide) Wed 08-Feb-12 16:55:15
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Network Question.


[link to this post]
 
Been playing with Wireshark and tbh it's a bit above my head. But I am seeing TCP DUP Acks and reassembled segments around the time my large downloads pause. Is the download losing packets and restarting after losing a packet or two?

I am trying to discern if it's my router or ISP. Pauses are fairly random and Billion cant reproduce the problem. Also if I use a Speedtouch 546 router it doesn't seem to happen or if I use multiple streams on the download eg 4 streams. One would have thought if the router was losing packets/segments it would happen on all download streams. Help!

Tim
www.vivaciti.net & freenetname
Billion 7800 on 24 Meg Variety LLU
My Broadband Speed Test
Standard User camieabz
(sensei) Wed 08-Feb-12 20:50:20
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Re: Network Question.


[re: Banger] [link to this post]
 
Try pingplotter free and see if there's an increased ratio of dropped packets when the pauses occur.

~~~~~~~~~~


© Camieabz 2002-2012

All Connection Data ~ plusnet

Scottish Labour politician: “The SNP are on a very dangerous tack. What they are doing is trying to build up a situation in Scotland where the services are manifestly better than south of the border in a number of areas.”

Interviewer: ”Is that a bad thing?”

Scottish Labour politician: “No, but they are doing it deliberately.”
Standard User Banger
(eat-sleep-adslguide) Wed 08-Feb-12 21:14:53
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Re: Network Question.


[re: camieabz] [link to this post]
 
Thought you may have had it there. Downloaded 500mb from TBB site, single stream, loads of pauses. Ran PP Free at same time and no PL anywhere on the route including my router to TBB. Ping went up to about 100ms while downloading then reduced to about 40ms during pauses. Any other ideas?

Tim
www.vivaciti.net & freenetname
Billion 7800 on 24 Meg Variety LLU
My Broadband Speed Test


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Standard User mixt
(experienced) Wed 08-Feb-12 21:19:50
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Re: Network Question.


[re: Banger] [link to this post]
 
Duplicate ACKs are normally an indication of out-of-order TCP packets. Incorrect traffic shaping or weird buffering somewhere could cause that.

When you get the download pauses, does this happen on all sites you test on or only on a specific site?

Now on <aaisp.net> (21CN+IPv6)
Previous ISPs: Virgin Media (50Mb/Cable), Be* Un Limited, ZeN
Is Linux routing your internet connection?
Need to make BIND geo-aware?
Standard User Banger
(eat-sleep-adslguide) Wed 08-Feb-12 21:22:05
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Re: Network Question.


[re: mixt] [link to this post]
 
All sites are effected, but if I use a download manager with 4 streams like DownThemAll no pauses.

Tim
www.vivaciti.net & freenetname
Billion 7800 on 24 Meg Variety LLU
My Broadband Speed Test
Standard User camieabz
(sensei) Wed 08-Feb-12 21:25:40
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Re: Network Question.


[re: Banger] [link to this post]
 
Well it's not dropped packets then. Use the 546 seems to be the best plan.

~~~~~~~~~~


© Camieabz 2002-2012

All Connection Data ~ plusnet

Scottish Labour politician: “The SNP are on a very dangerous tack. What they are doing is trying to build up a situation in Scotland where the services are manifestly better than south of the border in a number of areas.”

Interviewer: ”Is that a bad thing?”

Scottish Labour politician: “No, but they are doing it deliberately.”
Standard User mixt
(experienced) Wed 08-Feb-12 21:29:32
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Re: Network Question.


[re: Banger] [link to this post]
 
This is a truly an illusive problem!

Ok, another question. When you are downloading, are you maxing out your line speed? (if so, how fast?).

Can you rate-limit the download? (possibly better to download from a site that rate limits their side) to see if you still get pauses during a download running at a slower speed?

It sounds like a buffering problem, or like the Billion is tripping over itself (or something). Still not really sure to be honest.

Now on <aaisp.net> (21CN+IPv6)
Previous ISPs: Virgin Media (50Mb/Cable), Be* Un Limited, ZeN
Is Linux routing your internet connection?
Need to make BIND geo-aware?
Standard User BatBoy
(legend) Wed 08-Feb-12 21:29:49
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Re: Network Question.


[re: Banger] [link to this post]
 
Try lowering your RWIN or increasing interleaving



______________________________________________________________________________. __________________
Standard User Banger
(eat-sleep-adslguide) Wed 08-Feb-12 21:34:49
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Re: Network Question.


[re: camieabz] [link to this post]
 
In reply to a post by camieabz:
Well it's not dropped packets then. Use the 546 seems to be the best plan.


546 gets way too many CRC errors and reboots every 2-3 days but otherwise ok. Fairly limited on firmware choice too.

Tim
www.vivaciti.net & freenetname
Billion 7800 on 24 Meg Variety LLU
My Broadband Speed Test
Standard User Banger
(eat-sleep-adslguide) Wed 08-Feb-12 21:39:25
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Re: Network Question.


[re: mixt] [link to this post]
 
In reply to a post by mixt:
This is a truly an illusive problem!

Ok, another question. When you are downloading, are you maxing out your line speed? (if so, how fast?).

Can you rate-limit the download? (possibly better to download from a site that rate limits their side) to see if you still get pauses during a download running at a slower speed?

It sounds like a buffering problem, or like the Billion is tripping over itself (or something). Still not really sure to be honest.


Yes maxing line out at 17.76 mbps on a 19.88 mbps sync. Workaround is to use multiple streams. Router has QoS so could rate limit that way or software in firefox. Probably simplest way is to find a rate limited server possibly in US. Will report back on tests.

Tim
www.vivaciti.net & freenetname
Billion 7800 on 24 Meg Variety LLU
My Broadband Speed Test
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