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Re: Selection of Appropriate Local SMTP Relay

  • From: D'Arcy J.M. Cain
  • Date: Mon Jan 10 14:29:42 2000

Thus spake John R. Levine
> That's much too complicated.  What we need are some well-known IP
> addresses, analogous to well-known ports, that are not routable on the
> global Internet, but that are assigned to standard services within
> each network, e.g.:
> 
> 10.255.255.1 - DNS server
> 10.255.255.2 - SMTP server
> 10.255.255.3 - SOCKS server
> 10.255.255.4 - Web proxy
> 
> (Probably it's not a good idea to use network 10 here, better to
> reclaim a /24 from the swamp or allocate a fresh one.)  
> 
> Now you set up your mail client to use 10.255.255.2 for SMTP, and wherever
> you're connected, it'll be the local SMTP server.
> 
> >Advantages
> 
>  0. Works with all existing mail clients, no code changes needed, just a
>     one-time configuration.  Once this is widely accepted, MTAs would
>     ship with it as the factory default.
> 
> Some people have suggested something similar with a well-known-service
> pseudo-TLD that each network's DNS servers would serve up with the
> appropriate values for that network, e.g.
> 
> smtp.wks
> socks.wks
> webproxy.wks
> 
> I like that less because, as previously noted, lots of people never
> change their DNS config when they switch ISPs or roam, so they'd get
> the info for the wrong network.  Better to use IPs which you know will
> be routed by the routers for the network to which you are actually
> connected.

Why not both?  Instead of a private TLD, make a real one (wks.merit.edu?)
and assign the numbers there.  That way it doesn't matter who your DNS
server is.

-- 
D'Arcy J.M. Cain <darcy@{druid|vex}.net>   |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.





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