Common operational misconceptions

Masataka Ohta mohta at
Mon Feb 20 02:17:32 UTC 2012

Owen DeLong wrote:

>> I have running code to make the reverse translations, with
>> which protocols such as ftp with PORT commands are working.

> No, I think you do not understand...

How can't I understand several minor issues with the running code.

> I have 15 FTP servers and 22 web servers behind it.
> I want people to be able to go to ftp://<hostname>  and/or http://<hostname>  for each of them.
> Please explain to me how your code solves this problem?



   DNS SRV RRs of a domain implicitly specify servers and port numbers
   corresponding to the domain.

   By combining URLs and SRV RRs, no port numbers have to be specified
   explicitly in URLs, even if non-default port numbers are used, which
   makes URLs more concise for port based virtual and real hosting,
   where port based real hosting means that multiple servers sharing an
   IP address are distinguished by port numbers to give service for
   different URLs, which is the case for port forwarded servers behind
   NAT and servers with realm specific IP.

> Yeah, thought so.

The draft has been available since September 29, 2011.

					Masataka Ohta

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