Mikael Abrahamsson <swm...@swm.pp.se> writes: > On Tue, 17 Aug 2010, Nick Olsen wrote: > >> So lets say that you have multiple DNS resolvers in the same ip space that >> you advertise from multiple locations. All would be fine for the most part. >> But if you had a location equidistant network wise from two POP's wouldn't >> it load balance and possibly break some TCP sessions? How would someone get >> around this? This is also what OpenDNS does from what I understand. > > Usually network do not loadshare per-packet on BGP, so a TCP session > will "always" go to the same dns server, at least for the short > duration this TCP session lives.
Occasionally I have seen networks (usually small dual-homed ones) that attempt to equally utilize their network pipes by doing per-packet bgp load balancing to both upstreams. Then they wonder why their performance is so irregular. :-) -r
