[AusNOG] Twitter Routing

[Scott Howard]

On Sun, Apr 29, 2012 at 7:56 AM, Martin Hepworth <maxsec at gmail.com> wrote:

> Chris
> Most of the Oz to USA Traffic goes this way (as witnessed last year with
> the quake off japan and the issues getting to/from australia for a day or
> two) and will do till the southern cross cables get their full bandwidth
> upgrade towards the end of this year
>

Err, no it doesn't.

Whilst much (some?) of the traffic from Australia may go over the AJC cable
to Guam/Japan, it would normally not jump to Tata in Japan.  A more normal
traceroute from Telstra to the SJC area :

  1 TenGigabitEthernet0-12-0-2.exi-core1.Melbourne.telstra.net(203.50.80.1)
4 msec 4 msec 0 msec
  2 Bundle-Ether12.chw-core2.Sydney.telstra.net (203.50.11.74) 24 msec 24
msec 24 msec
  3 Bundle-Ether4.ken-core4.Sydney.telstra.net (203.50.6.41) 20 msec 24
msec 24 msec
  4 Bundle-Ether1.pad-gw2.Sydney.telstra.net (203.50.6.29) 20 msec 16 msec
24 msec
  5 203.50.13.114 16 msec 16 msec 16 msec
  6 i-0-3-0-0.paix-core01.bx.telstraglobal.net (202.84.140.9) [AS 4637] 152
msec 152 msec 156 msec
  7 i-2-2.paix01.bi.telstraglobal.net (202.84.251.58) [AS 4637] 152 msec
152 msec 152 msec
  8 paix.he.net (198.32.176.20) 152 msec 152 msec 164 msec
  9 10gigabitethernet1-4.core1.fmt2.he.net (72.52.92.66) 204 msec 200 msec
200 msec
 10 72.52.96.1 184 msec 184 msec 188 msec

In this case it simply looks like Telstra has a better route to Twitter via
Tata, and their nearest connection point to Tata is Japan.  To make it even
more confusing, the return path is very possibly direct and not via Japan.

  Scott
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