[Standards] LAST CALL: XEP-0220 (Server Dialback)
fippo at goodadvice.pages.de
Mon Nov 17 03:24:17 CST 2008
Joe Hildebrand schrieb:
> On Nov 13, 2008, at 4:27 AM, Philipp Hancke wrote:
>> If you want to remove dialback, maybe we should check if it can be
>> replaced by a dns lookup. Historically I that dialback is a result of
>> jabberd not binding to the proper ip address:
> There's a deployment reason for dialback. If you want your inbound and
> outbound connections on separate boxes, it's handy to not just rely on
> the IP address of the outbound server matching the one returned from DNS.
I have not seen any strictly separated inbound and outbound boxes for
quite some time. Even gmail does not use this feature (they connect from
22.214.171.124, aka xmpp-server4.l.google.com (which is contained in the
set of names returned when looking up _xmpp-server._tcp.gmail.com).
There is another reason why dialback is better than a simple dns lookup.
It protects against evil shell users on the originating server that are
able to open connections using its address.
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