Re: IMAP and SMTP port redirect

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On Tue, Jan 13, 2009 at 7:27 AM, Arun Shrimali <arun.reso@xxxxxxxxx> wrote:
> Hi everyone,
>
> I have some network related problem.
>
> I have network as follows :
>
> LAN (172.16.251.0/255.255.255.0 ) ---> Linux server (fedora 6, eth1
> 172.16.251.234, eth2 172.16.250.246, gw 172.16.250.245) <--NAT on
> router--> router (172.16.250.245)---> internet
>
> In LAN, PCs are not routed through gateway, because of security, I use
> squid for HTTP proxy using NCSA authentication.
> Now, I need configure Linux server to REDIRECT 143 port and 25 to wan.
>
> I would like to set LAN-PCs email clients imap server as:
> 172.16.251.234, when email client would like to download mail, he
> asked 172.16.251.234:143 and 172.16.251.234 will send packets to
> remote imap server (everyone in LAN use same imap).
> For smtp is the same case.
>
> Please, advice me, how to set iptables chains on linux machine.
>
> I have google a lot, but lot has confused me a lot
>
> Can anyone provide me a simple solution.
>
> Thank you very much and regards


I am in a bit of a rush right now, and don't have exact instructions,
but what you want to Google up is port forwarding. You can find some
fairly simple docs on that, i suggest the following search term:
"iptables port forwarding" You will probably need to do "masquerading"
as well.


-- 
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