Thus spake "Noel Chiappa" <jnc(_at_)mercury(_dot_)lcs(_dot_)mit(_dot_)edu>
> From: Ned Freed <ned(_dot_)freed(_at_)mrochek(_dot_)com>
Let me make sure I understand you here:
> IMAP4 has the characteristic that you often have a huge number
> of incoming connections, only a few of which are active at any
> given time. Designing servers to accomodate huge numbers of
> connections is a bit tricky, but workable: ...
> The 65536 limit, OTOH, has to be dealt with by using multiple
> server IP addresses, which in turn usually require multiple
> interfaces ...
> ... that doesn't mean nobody is hitting the 65536 limit imposed by
> source port numbers. They are, it causes problems
You're saying that there are servers which have close to (or more)
than 65K connections to a *single client IP address* (i.e. it may be a
NAT, with a number of hosts behind it)? (If a server is talking to a
number of different client IP addresses, it can have up to 65K
connections to *each*.)
That assumes the client is directly talking to the IMAP server. Some
servers are behind an "SSL accelerator" such that all connections come from
a single IP address, so only 64k clients are possible. Other servers may be
behind a webmail application, with the same effect.
The number of folks experiencing this has to be pretty low, but it'd be a
severe problem for them.
Stephen Sprunk "Those people who think they know everything
CCIE #3723 are a great annoyance to those of us who do."
K5SSS --Isaac Asimov
Ietf mailing list