[Standards] RFC 3920, 10.2/10.3: subdomain routing rules

Philipp Hancke fippo at goodadvice.pages.de
Wed Mar 28 04:58:38 UTC 2007


Justin Karneges wrote:
[...]
>>There are a couple of comments, in sections 3.2 and C.4, which seem to
>>imply that routing of subdomains was special in pre-SRV Jabber, so would
>>I be right to guess that this is a historical artefact?
> 
> 
> The only "special" routing that I'm aware of, is that if a domain resolves to 
> the same IP address as one which you already have an active dialback s2s 
> stream with, then you can initiate a new dialback right over the existing 
> stream.  (Server guys: correct me if I'm wrong).

In the post-dialback (or even with starttls+dialback) world you dont
want such reuse (tls+sasl being the main reason for this). So this
applies only to dialback anyway.

> In the old days it was very common for subdomains to all point to the same IP 
> address as the base domain, however I don't think there was any protocol 
> specifically for subdomains.
> 
> I, too, don't understand why the RFC even mentions subdomains at all.

+1 on removing them.



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