Re: [tsvwg] [port-srv-reg] draft-ietf-tsvwg-iana-ports-02

[Fernando Gont <fernando at gont.com.ar>]

Joe Touch wrote:

> It'd be useful to consider whether there are actually 15K connections
> and thus a real problem, 

file sharing (p2p) applications tend to create lots of connections.
Although I wouldn't go as far as 15K (at least for *my* client systems).
When it comes to e.g., a busy web-proxy server and similar systems, I
guess the number of ongoing connections increases quite a bit.


> or whether the hosts are incompletely
> implementing port reuse checks that prevent a port from being used for
> different IP addresses simultaneously. 

Unfortunately, you need to do this. See the API section in the CPNI TCP
document (i.e., connection stealing).

If we had socket(),bind(), and listen() combined in a single system call
(and that was the only way to do things), then I'd agree that we could
implement the checks you refer to.



>> Also, in retrospective, with the "registered ports" thing you're wasting
>> most of the port number space when you will probably use... what? a
>> maximum of 10 or 20 ports of those 50K ports?
> 
> And only 6,000 of those 50K are even assigned. 

Had not check the number of currently registered ports. -- interesting.



> Again, though, making the
> space even 4x larger has only a 4x impact on current issues - that's not
> all that much, IMO.

Not all that much... but certainly better than 1x.

-- 
Fernando Gont
e-mail: fernando at gont.com.ar || fgont at acm.org
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