Re: Scalability with high density servers and proxies, TCP port limits

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