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Re: [Debian-NYC] debugging network slowness



On 12/16/2010 08:07 PM, steve beltzer wrote:
> This is what I got:
> 
> steve@francisco:~$ traceroute nytimes.com
> traceroute to nytimes.com (199.239.136.200), 30 hops max, 60 byte packets
>  1  bdl1.nyr-ubr1.nyr.ny.cable.rcn.net (10.22.200.1)  12.531 ms  17.310 ms 21.094 ms
>  2  vl4.aggr1.nyw.ny.rcn.net (208.59.246.1)  29.492 ms  29.439 ms  29.386 ms
>  3  vl130.core4.nyw.ny.rcn.net (207.172.15.67)  33.368 ms  34.526 ms  34.472 ms
>  4  tge1-4.core4.phdl.pa.rcn.net (207.172.19.228)  39.016 ms  44.013 ms 53.563 ms
>  5  tge2-4.core4.lnh.md.rcn.net (207.172.19.225)  53.505 ms  53.442 ms 53.395 ms
>  6  tge2-4.border1.eqnx.va.rcn.net (207.172.19.205)  53.342 ms  21.032 ms 20.182 ms
>  7  xe-0.equinix.asbnva01.us.bb.gin.ntt.net (206.223.115.12)  27.108 ms 26.421 ms  25.911 ms
>  8  ae-0.r20.asbnva02.us.bb.gin.ntt.net (129.250.4.4)  31.160 ms  30.999 ms 30.894 ms
>  9  ae-6.r23.nycmny01.us.bb.gin.ntt.net (129.250.2.8)  43.513 ms  43.343 ms 43.246 ms
> 10  po-3.r02.nycmny01.us.bb.gin.ntt.net (129.250.2.41)  43.150 ms  43.074 ms *
> 11  ge-1-1.a00.nycmny01.us.da.verio.net (129.250.30.113)  42.962 ms
> ge-1-2.a00.nycmny01.us.da.verio.net (129.250.30.193)  44.132 ms
> ge-1-1.a00.nycmny01.us.da.verio.net (129.250.30.113)  43.910 ms
> 12  * * *
> 13  128.241.244.54 (128.241.244.54)  28.419 ms !X * *
> steve@francisco:~$

This is weird in several ways.

0) round-trip latency to the nearest nodes is on the high side.  21 ms
for a first-hop router seems steep to me, but then, maybe you're on wireless

1) the rest of the intermediate nodes have pretty reasonable round-trip
latency.

2) hop 11 is odd because there seem to be three network paths taken
there -- maybe there's some sort of load-balancing routing going on?

3) according to "man traceroute", hop 13's !X notation means
"communication administratively prohibited" -- what are these network
admins doing?

Can you try to get the same report, from the same network connection, to
the same host, but under windows 7?  I believe on windows the command is
"tracert", not "traceroute".  And you'd need to run it from a CMD.EXE
shell (you can get there from the start menu -> Run... -> "CMD", if my
rusty windows memory is still relevant.

	--dkg

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