How to configure dovecot imap to listen on multiple ports?

[Rick Thomas]

Thanks! Gedalya and Jochen!

I hadn’t realized I could do that with iptables.  I’ll read-up on the documentation.

Rick

On Aug 25, 2014, at 5:38 AM, Gedalya <gedalya at gedalya.net> wrote:

> On 08/25/2014 08:26 AM, Jochen Bern wrote:
>> Well, if offering the*exact same*  functionality on a second port is all
>> that needs to be done, having the server's host firewall (iptables?)
>> duplicate the NAT on your border firewall for internal accesses should
>> do just fine; no need to majick it into the dovecot config (which opens
>> the possibility of functional differences being introduced unintentionally).
>> 
>> Assuming Red Hat or similar with no conflicting iptables rules (yet),
>> 
>> # iptables -t nat -A PREROUTING -p tcp --dport 30xxx -j DNAT --to :143
>> # iptables -t nat -A PREROUTING -p tcp --dport 30yyy -j DNAT --to :993
>> # service iptables save
>> 
>> Regards,
> 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
>