Scalability with high density servers and proxies, TCP port limits

[Urban Loesch]

Hi,

Am 03.07.2015 um 05:14 schrieb Christian Balzer:

>
> 2. Here is where the fun starts.
> Each IMAP session that gets proxied to the real mailbox server needs a
> port for the outgoing connection.
> So to support 2 million sessions we need 40 IP addresses here. Ouch.
> And from a brief test having multiple IP addresses per server won't help
> either (Dovecot unsurprisingly picks the main IP when establishing a
> proxy session to the real mailbox), at least not with just one default GW.
>

If I remeber correctly there is a config option in dovecot 2.x where you 
can set the ip addresses which dovecot should use for outgoing proxy 
connections. Sorry, but I can't remeber the option.

Best
Urban