Numbering nameservers and resolvers

Patrick W. Gilmore patrick at
Mon Aug 16 13:11:37 UTC 2010

On Aug 16, 2010, at 9:03 AM, Chris Adams wrote:
> Once upon a time, Patrick W. Gilmore <patrick at> said:
>> 1) Use different prefixes.  A single prefix going down should not kill
>> your entire network.  (Nameservers and resolvers being unreachable
>> breaks the whole Internet as far as users are concerned.)
> How do you do this in the IPv6 world, where I get a single /32?  Will
> others accept announcements of two /33s to better handle things like
> this?

Oooooooooobviously I was not thinking clearly, since I was only considering v4. =)

But you do what you can.  Some people have only a single v4 prefixes as well.  If you can't use more than one prefix, then don't.

Other good suggestions were things like ensuring the default exit point for each NS was a different vector.  If you have only one exit point, that is not possible.  But it does not mean the suggestion is bad.


More information about the NANOG mailing list