Re: Help with route latency between TATA and Comcast

[Anurag Bhatia <me () anuragbhatia com>]

Hi



As from Tata AS6453 looking glass:


Router: gin-laa-mcore3
Site: US, Los angeles, LAA
Command: ping ip 216.6.87.114

Sending 5, 100-byte ICMP Echos to 216.6.87.114, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms



So basically that IP/router is in US but you getting high latency because
of return path which is likely via East Asia. As Joel rightly pointed out -
end to end latency is just fine in this case.



Have fun!




On Tue, Jun 24, 2014 at 11:58 PM, joel jaeggli <joelja () bogus com> wrote:

> On 6/24/14 10:49 AM, rwebb () ropeguru com wrote:
> > I am doing some testing between my Comcast Business connection and a
> > Singapore server that I have just setup. I am seeing high latency to the
> > server but it appears it is the Comcast to TATA link and not the link
> > between the U.S. and Singapore. At least that is what I can gather from
> > the reverse lookup in the traceroute.
>
> given that the latency to hop 9 is basically the same as hop14 you're
> looking at mpls...
>
> if the transpacific hop were on top of that you'd see at least another
> 100 ms added to the rtt between 9 and 11.
>
> it's 9655 miles IAD - SIN over the pole, realistically an actually fiber
> paths is likely more than 12000 so you'd expect to see ~more than 150ms
> rtt under the best circumstances...
>
>
> > Can someone please enlighten me as to if I am correct or not?
> >
> > Tracing route to 128.199.162.241 over a maximum of 30 hops
> >
> >   1    <1 ms    <1 ms    <1 ms  192.168.1.254
> >   2     1 ms    <1 ms    <1 ms
> > 23-25-112-190-static.hfc.comcastbusiness.net [23.25.xxx.xxx]
> >   3    27 ms    22 ms    19 ms  96.178.10.1
> >   4    10 ms     9 ms    10 ms
> > te-1-3-ur01.shadygrove.va.richmond.comcast.net [68.86.124.241]
> >   5    17 ms    17 ms    17 ms
> > xe-12-0-1-0-ar02.charlvilleco.va.richmond.comcast.net [68.86.172.17]
> >   6    24 ms    24 ms    25 ms
> > pos-1-2-0-0-cr01.ashburn.va.ibone.comcast.net [68.86.91.53]
> >   7    24 ms    23 ms    23 ms
> > pos-0-3-0-0-pe01.ashburn.va.ibone.comcast.net [68.86.86.142]
> >   8    20 ms    20 ms    20 ms  66.208.233.38
> >   9   268 ms   264 ms   265 ms if-6-8.tcore2.lvw-los-angeles.as6453.net
> > [216.6.87.114]
> >  10     *        *        *     Request timed out.
> >  11   270 ms   255 ms   256 ms if-2-2.tcore1.svw-singapore.as6453.net
> > [180.87.12.1]
> >  12   270 ms   271 ms   275 ms if-11-2.thar1.svq-singapore.as6453.net
> > [180.87.98.37]
> >  13   260 ms   258 ms   260 ms  180.87.98.6
> >  14   256 ms   256 ms   258 ms  103.253.144.242
> >  15   262 ms   258 ms   259 ms  128.199.162.241
> >
> > Trace complete.?


-- 


Anurag Bhatia
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