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

Gavin Brown gavin.brown at centralnic.com
Fri Oct 12 16:32:52 UTC 2012

Hi Marco,

> You can put the service IP on a loopback interface, so even if the
> host is "sleeping", nsd can bind that IP trough the loopback in a
> local scope.

That works! I tweaked the rc.d script to set up the service address on 
the loopback interface immediately before NSD starts (in the 
start_precmd routine), and then remove it as soon as it has started (by 
adding a start_postcmd) routine. Now the service address can flip-flop 
between the two hosts without disrupting the service.

Thanks for the tip!


Gavin Brown
Chief Technology Officer
CentralNic Ltd
Innovative, Reliable and Flexible Registry Services
for ccTLD, gTLD and private domain name registries

CentralNic Ltd is a company registered in England and Wales with company
number 4985780. Registered Offices: 35-39 Moorgate, London, EC2R 6AR.

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