Maximum # of secondaries?

[Barry Margolin]

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
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