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Re: [Debian-NYC] debugging network slowness



On 12/16/2010 12:36 AM, Brian Gupta wrote:
> On Wed, Dec 15, 2010 at 4:57 PM, Daniel Kahn Gillmor <dkg@fifthhorseman.net> wrote:

>>  * wget takes far too long to do something as simple as loading an http
>> redirect. (15 seconds just to fetch the redirect from
>> http://nytimes.com/ to http://www.nytimes.com/)
>>
>>  * DNS on its own does not seem to be the problem: directly querying the
>> local nameservers with dig returns results very quickly (~0.02 to 0.04
>> seconds), and all three nameservers in resolv.conf are at comparable speeds.
>>
>>  * TCP connections on their own do not seem to be the problem: using
>> netcat to connect to the times' site and fetch the same 302 redirect is
>> also trivially quick (less than a tenth of a second)
> 
> Stupid question, has anyone thought to run traceroute while there are
> megaslow network conditions? (My apologies if so, as I haven't been
> following closely.)

it's not a stupid question.  But as you can see from the notes above,
DNS on its own and TCP on its own are *not* mega-slow.  This is what has
me stumped.

But sure, a traceroute wouldn't hurt.

Here's what i get to the test server we've been using:

>>> 0 dkg@pip:~$ traceroute nytimes.com
>>> traceroute to nytimes.com (199.239.136.200), 30 hops max, 60 byte packets
>>>  1  splat.lair.fifthhorseman.net (192.168.13.1)  0.479 ms  0.384 ms  0.346 ms
>>>  2  er1.nyc1.speakeasy.net (216.254.115.1)  10.477 ms  13.184 ms  18.252 ms
>>>  3  110.ge-0-0-0.cr1.nyc1.speakeasy.net (69.17.83.213)  20.059 ms  20.518 ms  20.890 ms
>>>  4  444.ge-3-3-0.mpr1.lga3.us.above.net (208.184.48.178)  15.247 ms  15.931 ms  17.337 ms
>>>  5  above-qwest.lga5.us.above.net (64.125.13.246)  18.301 ms  18.992 ms  21.435 ms
>>>  6  * * *
>>>  7  nyc-edge-03.inet.qwest.net (205.171.217.26)  25.186 ms  8.844 ms  10.333 ms
>>>  8  * * *
>>>  9  * * *
>>> 10  * * *
>>> 11  * * *
>>> 12  * * *
>>> 13  * * *
>>> 14  * * *
>>> 15  * * *
>>> 16  * * *
>>> 17  * * *
>>> 18  * * *
>>> 19  * * *
>>> 20  * * *
>>> 21  * * *
>>> 22  * * *
>>> 23  * * *
>>> 24  * * *
>>> 25  * * *
>>> 26  * * *
>>> 27  * * *
>>> 28  * * *
>>> 29  * * *
>>> 30  * * *
>>> 0 dkg@pip:~$ 

Steve, what do you see when you're using one of the networks on which
iceweasel gives you trouble?

	--dkg

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