DNS Load Balancing
phn at icke-reklam.ipsec.nu
phn at icke-reklam.ipsec.nu
Tue Jul 20 09:16:45 UTC 2004
wcbasquin <wcbasquin at yahoo.com> wrote:
> Hello,
> When using round robin DNS load distribution is it possible to still
> return multiple addresses in the response? I have a situation where
> the resolver can handle multiple addresses for backup, using the first
> address as primary and the other addresses are stored in case the
> first address becomes unavailable. My understanding is that round
> robin will select from multiple address and send just one address in
> the response. If this is the case then I will loose the resiliency of
> returning multiple addresses. If this is not possible using standard
> BIND could it be done with lbnamed?
You are asking for the client-side part, the resolver. And yes, all
answers for adresses is returned in a struct that has a list of addresses.
Some (broken) apps only picks the first address, other tries the first,
if that does not respond tries the list until a working address is found
or the list ends.
The server side might be interesting too, if implemented in a way that only
one address is returned, there is no way a client can try another address.
> Thanks,
> Bill
--
Peter Håkanson
IPSec Sverige ( At Gothenburg Riverside )
Sorry about my e-mail address, but i'm trying to keep spam out,
remove "icke-reklam" if you feel for mailing me. Thanx.
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