[afnog] ZA <-> MZ Routing Problem

[Graham Beneke]

Hi All

Is anyone from Telecomunicações de Moçambique (TDM) on this list? I'd be
happy for on-list or off-list responses.

I have been tracking a routing problem between TDM and South Africa for
about the last 6 months and it seems that it has not been resolved.

I am seeing high latency between TDM and South Africa and this is
negatively impacting Internet performance for a number of customers and
downstream ISPs in Mozambique, Malawi and potentially elsewhere too.

 4  196.43.52.42 (196.43.52.42)  1.435 ms  1.698 ms  1.605 ms
 5  196.43.26.106 (196.43.26.106)  1.518 ms  1.414 ms  1.401 ms
 6  tdm-mozambique-gw2.telkom-ipnet.co.za (196.25.179.210)  175.688 ms
176.444 ms  176.313 ms
 7  gi-0-2.cta-isp-car-3.tdm.mz (41.220.160.202)  176.233 ms  176.154 ms
 176.075 ms
 8  stats.zambeze.tdm.mz (196.28.224.21)  175.997 ms  176.333 ms  176.178 ms

The round-trip latency between Johannesburg and Maputo should be under
30ms yet it is over 170ms. There does appear to be a direct cross border
link so this should not be the case.

What appears to be happening is that while routes from TDM are
propagating to peers in ZA, the 2000+ ZA route are not propagating into
MZ. Packets towards MZ are flowing directly cross border while the
return path is asynchronous via Europe.

Can anyone assist with resolving this?

-- 
Graham Beneke
Network Engineer      | Neology (PTY) Ltd.
graham at neology.co.za  | http://www.neology.co.za/
Dir: +27-10-500-5906  | Suite 301, Block C, Eva Park
Tel: +27-11-476-1933  | Cresta, Johannesburg
Skype: grbeneke       | MSN: graham at neology.co.za