Comcast latency Maryland area
Lincoln Dale
ltd at interlink.com.au
Wed Nov 30 06:59:53 UTC 2005
you don't say the ip-addr-block where you're doing a traceroute _from_.
perhaps your private address space NATs into 73.138.40.1?
looks more like assymetric routing to me with _return traffic_ from AT&T
and L3 taking a far longer path back to you.
checking my connectivity to there, it looks perfectly normal.
assuming that its a OC48 POS connection between hops 7 & 8 (big
assumption, but bear with me), 160 msec of queuing latency equates to 47
megabytes of buffering on that link. [1]. unlikely.
if we assume its a GbE connection at hops 7 & 8, then it'd be 19
megabytes of buffering. [2]. still unlikely.
i guess it COULD be a 7 Mbps DSL connection .. yeah .. that'd be it .. a
DSL router with 128KB buffering.. :) [3]. (this one is obviously a joke)
[1] (2488*10^6 / 8) * (0.250 - 0.090) / (1024*1024)
[2] (2488*10^6 / 8) * (0.250 - 0.090) / (1024*1024)
[3] (7*10^6 / 8) * (0.250 - 0.090) / (1024)
did you lodge a trouble ticket with comcast if you feel they have a problem?
cheers,
lincoln.
Mark Owen wrote:
> Congested router?
>
>
> Tracing route to google.com [72.14.207.99]
> over a maximum of 30 hops:
>
> 1 <1 ms <1 ms <1 ms 192.168.20.1
> 2 15 ms 6 ms 5 ms 73.138.40.1
> 3 7 ms 6 ms 26 ms ge-2-3-ur01.lanham.md.bad.comcast.net [68.87.131
> .113]
> 4 6 ms 7 ms 7 ms te-9-1-ur01.bowie.md.bad.comcast.net [68.87.128.
> 177]
> 5 7 ms 8 ms 7 ms te-8-2-ar01.capitolhghts.md.bad.comcast.net [68.
> 87.128.182]
> 6 17 ms 23 ms 15 ms 68.87.16.153
> 7 92 ms 92 ms 91 ms pos-0-0-cr01.whitemarsh.md.core.comcast.net [68.
> 87.16.21]
> 8 250 ms 253 ms 254 ms 12.118.102.5
> 9 259 ms 263 ms 257 ms tbr1-p010101.n54ny.ip.att.net [12.123.3.82]
> 10 255 ms 252 ms 253 ms ggr2-p300.n54ny.ip.att.net [12.123.3.58]
> 11 294 ms 284 ms 275 ms so-7-1.car3.NewYork1.Level3.net [4.68.127.5]
> 12 283 ms 286 ms 283 ms ae-1-56.bbr2.NewYork1.Level3.net [4.68.97.161]
> 13 267 ms * 277 ms as-1-0.bbr1.Chicago1.Level3.net [64.159.0.237]
> 14 277 ms 286 ms 278 ms ae-12-51.car2.Chicago1.Level3.net [4.68.101.3]
> 15 253 ms 260 ms 263 ms unknown.Level3.net [209.247.34.26]
> 16 279 ms 278 ms 288 ms 64.233.175.97
> 17 274 ms 309 ms 289 ms 66.249.94.69
> 18 292 ms 272 ms 290 ms 66.249.94.73
> 19 275 ms 268 ms 293 ms 72.14.207.99
>
> Trace complete.
More information about the NANOG
mailing list