[nsd-users] Question about response source address and dynamic interfaces

[Peter Hessler]

I use 'outgoing-interface: 10.0.0.3' in my config, per domain.  Annoying
that I can't set it globally, but I have a template I copy-and-paste for
my domains.


On 2012 Oct 09 (Tue) at 10:57:13 +0100 (+0100), Gavin Brown wrote:
:I was never able to resolve this issue, but Bert Hubert recently
:posted on a related topic. If NSD did what PowerDNS now does, this
:would resolve my problem!
:
:On binding datagram (UDP) sockets to the ANY addresses:
:
:http://bert-hubert.blogspot.co.uk/2012/10/on-binding-datagram-udp-sockets-to-any.html
:
:On 16/08/2012 15:39, Gavin Brown wrote:
:>Hi there,
:>
:>I have a FreeBSD box (hostA) running NSD. It has a management address
:>(10.0.0.2) and a service address (10.0.0.3). It is part of a clustered
:>pair with a Linux machine (hostB) that has a management address
:>(10.0.0.4) and a service address (10.0.0.5). DNS queries are sent to the
:>two service addresses. Heartbeat is used to co-ordinate the pairs: if
:>hostB goes offline, then the service address (10.0.0.5) is brought up on
:>hostA so that it can answer queries, and vice versa.
:>
:>The problem is this: without an ip-address entry in nsd.conf, responses
:>are sent from the management address (10.0.0.2) since that is the
:>"primary" interface of the host. I can fix this during normal operations
:>by adding an ip-address entry for 10.0.0.3.
:>
:>However, during failover, queries sent to 10.0.0.5 will be answered with
:>the wrong source address. Again, I could fix this using an ip-address entry.
:>
:>But - when the machine boots, this IP address isn't assigned to hostA,
:>so if it appears in nsd.conf, NSD will refuse to start. BIND (which I'm
:>using on hostB) doesn't have this problem.
:>
:>Has anyone else solved this problem? Or do I need to write scripts to
:>munge nsd.conf and restart it during failover/failback?
:>
:>Thanks,
:>
:
:-- 
:Gavin Brown
:Chief Technology Officer
:CentralNic Ltd
:Innovative, Reliable and Flexible Registry Services
:for ccTLD, gTLD and private domain name registries
:https://www.centralnic.com/
:
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:number 4985780. Registered Offices: 35-39 Moorgate, London, EC2R 6AR.
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:

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