How many nameservers?

Barry Margolin barmar at
Tue Feb 3 06:00:16 UTC 2009

In article <gm7ksm$198c$1 at>, bsfinkel at wrote:

> One downside - if you have many NS records, then they might not all
> fit in one UDP packet (the Authority and/or Addition sections of a
> response to a DNS query).  This will cause the protocol to revert
> to TCP.

Truncation isn't supposed to happen if you overflow in the Additional 
section, is it?  These records are already optional, so they can be left 
out if it would cause the packet to exceed the maximum UDP size.

Barry Margolin, barmar at
Arlington, MA
*** PLEASE don't copy me on replies, I'll read them in the group ***

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