[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Sipping] Question on draft-ietf-sipping-v6-transition-07

On Fri, 2010-02-05 at 09:03 -0600, Kevin P. Fleming wrote:
> That would in fact be wrong, domain names cannot begin with '.'. In
> addition, I'd recommend against allowing an 'invalid' name that does not
> contain '.', because many systems (including my laptop) are configured
> with default DNS search domains that are searched when names that
> contain only one component are resolved. 'invalid' in my case would
> search in at least two domains for 'invalid.xxx.yyy', which is not
> helpful in the context of this draft.
> Explicitly specifying 'this.is.invalid' or something similar seems to be
> prudent in this case.

That's an interesting point.  As you note, "invalid" is a perfectly
valid DNS name that is reserved.  But it might be subject to bad
resolver behavior.  Indeed, IIRC some popular resolvers will always
search multiple configured domains unless the name given to them is
ended with an extra "." (which seems to be allowed for in the syntax).
But any SIP implementation should use its local resolver in such a way
that such additional searches are never done.

But how many SIP implementations do that correctly?


Sipping mailing list  https://www.ietf.org/mailman/listinfo/sipping
This list is for NEW development of the application of SIP
Use sip-implementors@xxxxxxxxxxxxxxx for questions on current sip
Use sip@xxxxxxxx for new developments of core SIP

[IETF Announce]     [IETF Discussion]     [Linux SCSI]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Photo]     [Yosemite News]    [Yosemite Photos]    [Free Online Dating]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Big List of Linux Books]

Add to Google Powered by Linux