ebay dropping asymmetric traffic?

Fri Jan 9 20:10:00 UTC 2009

Ever notice you can't reach routing peeps by phone anymore?

I have a few networks which are routing out one provider and return 
another. Not general practice, but it's ended up that way. As of last 
night I've had reports flowing in of these networks unable to hit ebay. 
The other networks in that area which leave and return via the same 
route seem to be working, and the broken networks returned to operation 
status when we forced ebay traffic around the network to make the flows 
symmetrical.

I've heard this is causing problems in other networks as well. Has 
anyone seen this? Any idea of the specifics? I'm almost tempted to 
believe it's some form of RPF on inbound traffic (the observed path was 
via their cox interconnect).

Jack