Maximum # of secondaries?

[Kevin Darcy]

If too many NS records exist for a zone, though, one could experience problems
with UDP-packet-size limitations. But that would generally only affect servers,
since clients don't usually make NS queries. And it's not a fatal error in any
case, just a little inefficient.


- Kevin

Barry Margolin wrote:

> In article <Pine.BSF.3.96.991006112219.6094C-100000 at hiway1.exit109.com>,
> Michael Cunningham  <malice at exit109.com> wrote:
> >Is this doable with bind? Can a master have 11 slaves and still
> >function properly?
>
> The master doesn't care how many slaves it has.  The only place where the
> master even considers the slaves is when it's sending NOTIFY messages after
> a zone has updated.  It simply sends them to all the hosts in the NS
> records for the domain.  The overhead of this is minimal, so there's no
> problem with 10 of them.
>
> If the domains are huge I suppose there could be a bandwidth problem if all
> 10 slaves try to transfer the zone at the same time after receiving the
> NOTIFY.  But for small domains this shouldn't be a problem, because the
> slaves wait a random amount of time after receiving the NOTIFY before they
> request the zone transfer, precisely to avoid them all hitting the master
> simultaneously.
>
> >                   Will the internic deal with 1 master and 10 slaves when
> >it comes to external dns? I know I dont need so many external dns servers
> >but the boss wants redundancy for each internet link. The internal dns
> >servers will be forwarding their Internet lookups to the external dns
> >servers.
>
> I think Network Solutions will register at most 6 servers for a domain.
> But you can put additional servers in your NS records, and they'll be
> included in the Authority Records section of your responses, so other
> servers will cache the additional servers after they first query one of the
> registered servers.
>
> Maybe some of the new registrars don't have this limitation.
>
> --
> Barry Margolin, barmar at bbnplanet.com
> GTE Internetworking, Powered by BBN, Burlington, MA
> *** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
> Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.