Stub Entries Bind 9 & Server Failure Errors
Barry Margolin
barmar at genuity.net
Thu Feb 28 18:59:20 UTC 2002
In article <a5lt80$iee at pub3.rc.vix.com>, Sargon <doctor at ptd.net> wrote:
>
>Lets try this post again...
>
>We recently updated our DNS servers from a Bind 8 version to Bind 9.2.0 and
>everything appears to be working fine except for the following:
>
>A customer of ours has a stub entry set-up so that they can administor their
>own /24 IP assignment, which is part of a larger /20 assignment allocated to
>us. The customer did change their dns server information recently however all
>dns servers appear to have updated to the correct information and yet the
>following is occurring.
>
>Whenever you look up and IP address in the Stubbed /24 assignment on any dns
>server except ours and the customers you get server failed.
I don't see how you expect this to work. When your server receives a query
in one of these reverse domains, it will not have the Recursion Desired
flag set. Since your server is only a stub, not a slave, for the reverse
domain, it won't have the PTR records in its memory. The NS records don't
help, since you can't delegate "sideways". If this worked in BIND 8 I'm
not sure why.
There's two ways to implement what you want:
1) Configure the servers that the /24's are assigned to as slaves rather
than stubs.
2) Use the RFC 2317 mechanism to delegate all 256 addresses in each /24 to
the customer's servers.
>Our Configuration Examples: (Not real assignment just using to show config
>settings)
>
>named.conf
>
>zone "1.168.192.in-addr.arpa" {
> type stub;
> file "db.192.168.1";
> masters {
> 10.0.0.1;
> 10.0.0.2;
> 10.0.0.3;
> };
>};
>
>
>DB File:
>
>$ORIGIN .
>1.168.192.in-addr.arpa. IN SOA dns3.junk.com.
>dns-request.junk.com. (
> 2002022801
> 10800
> 3600
> 2419200
> 3600
>
> NS dns1.junk.com.
> NS dns2.junk.com.
> NS dns3.junk.com.
>
>Now note the dns3.junk.com was the dns server for which they recently switched
>the IP Address. Otherwise everything else appears to be fine. Errors do not
> show anything for this assignment and I have restarted named and flushed
>cache several times.
>
>Basically I am stuck. We made no physical changes to this configuration since
>long before we started using Bind 9.2.0 so the only changes were the upgrade &
>customers dns server IP change.
>
>Can anyone help or offer some ideas of what might be wrong?
>
>Thanks,
>
--
Barry Margolin, barmar at genuity.net
Genuity, Woburn, MA
*** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups.
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