Numbering nameservers and resolvers
Robert E. Seastrom
rs at seastrom.com
Wed Aug 18 08:37:09 CDT 2010
Mikael Abrahamsson <swmike at 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. :-)
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