Comcast latency Maryland area

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1

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.

2

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.. :slight_smile: [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: