From: Peter Nørlund
> Sent: 29 September 2015 12:29
...
> As for using L4 hashing with anycast, CloudFlare apparently does L4
> hashing - they could have disabled it, but they didn't. Besides,
> analysis of my own load balancers showed that only one in every
> 500,000,000 packets is fragmented. And even if I hit a fragmented
> packet, it is only a problem if the packet hits the wrong load
> balancer, and if that load balancer haven't been updated with the state
> from another load balancer (that is, one of the very first packets). It
> is still a possible scenario though - especially with large HTTP
> cookies or file uploads. But apparently it is a common problem that IP
> fragments gets dropped on the Internet, so I suspect that ECMP+Anycast
> sites are just part of the pool of problematic sites for people with
> fragments.
Fragmentation is usually more of an issue with UDP than TCP.
Some SIP messages can get fragmented...
David
