[dns-operations] Natting DNS farm behind LB - using priv ip space.

João Damas joao at bondis.org
Fri Jun 3 15:33:05 UTC 2011

main issues in those setups tend to be:
- latency introduced by the LB
- state kept by the LB, which can kill it if the DNS servers get a lot of queries, particularly over UDP as is normal for DNS and abnormal for LB
- support for modern DNS packets in the LB (some of them are really broken and look into things they shouldn't)


On 3 Jun 2011, at 17:16, Bob Paolucci wrote:

> Hey guys,
> This is a pretty open question...
> But anyone forsee any issue with the following setup:
> Bunch of DNS resolvers that are behind a load balancer, load balancer is presenting anycast to the clients for resolution, dns servers behind load balancer only have private ip's on their interfaces, load balancer has a single nat address for the outgoing queries / responses.
> Thoughts?  Concerns?
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