Convice Bind to listen on IP alias with a range of IPs.
p.mayers at imperial.ac.uk
Tue May 1 09:00:52 UTC 2012
On 04/30/2012 10:56 PM, Augie Schwer wrote:
> I must be doing something wrong, because what I want to do doesn't
> seem that difficult.
> I have a range of IPs bound to a local interface:
> lo:1 Link encap:Local Loopback
> inet addr:10.0.0.1 Mask:255.255.255.224
> And I want to convince Bind to listen on sub-set of the given range (
> 10.0.0.2 for example ), yet when I configure that IP:
Which operating system are you running?
Contrary to what a lot of other people have suggested, it is in fact
possible using the socket API to bind() to IPs which aren't explicitly
created, due to special handling on the loopback interface. This can
certainly be done under Linux, for example., and I have just
re-confirmed that to myself.
I assume, because of the phrasing of your question, that your OS does
indeed have this feature, and you've tested it working with other
applications (even if as simple as netcat)?
Unfortunately, it seems likely that named is using the normal socket
APIs to first enumerate the list of IPs on the box, and then filter
those through listen-on statements to get the final list of IPs to pass
to a bind() socket call - this would be a sensible way to implement the
CIDR listen functionality.
If so, then if the IP isn't *explicitly* on an interface, it won't
appear in the final output set, regardless of the fact a bind() call
So you might be being a bit too clever, and foxing the named socket code
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