How to configure dovecot imap to listen on multiple ports?

[Jochen Bern]

On -10.01.-28163 20:59, Gedalya wrote:
> On 08/25/2014 08:26 AM, Jochen Bern wrote:
>> Assuming Red Hat or similar with no conflicting iptables rules (yet),
>> # iptables -t nat -A PREROUTING -p tcp --dport 30xxx -j DNAT --to :143
> 
> Since you're redirecting to a port on the same host, the following is
> perhaps more correct:
> iptables -t nat -A PREROUTING -p tcp --dport 30143 -j REDIRECT --to-port 143

The operational word being "perhaps". My approach will break if the
server does any forwarding, yours will break if dovecot listens only on
a secondary IP address, or at least that's what the manpage I grabbed
off a CentOS 6 says:

> REDIRECT
> [...] It redirects the packet to the machine itself by changing the
                                                         ^^^^^^^^^^^^
> destination IP to the primary address of the incoming interface
  ^^^^^^^^^^^^^^^^^^^^^^#######^^^^^^^^
> (locally-generated packets are mapped to the 127.0.0.1 address).

Regards,
								J. Bern
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