Hi
I need some help on the following problem with Iptables. Can anybody provide me with some help.
Server Details a) Our service provider provides us a catchall account & SMTP access. e.g. Server IP 10.10.10.10
b) We have a gateway firewall server with squid running. e.g. Server IP 55.55.55.55 (Live IP)
c) We have a email server running behind the firewall. e.g Server IP 77.77.77.77
To Do a) The email server should be able to send POP & SMTP requests to our email service providers server ie 10.10.10.10 via our gateway server
b) Users from internet should be able to access our internal email server i.e. 77.77.77.77 via our gateway server 55.55.55.55
Current Status a) I feel the following iptable code running on our gateway server will allow users from internet to access our internal email server. Please advice if this is right. (Note : eth1 - External Network Card)
iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE iptables -t nat -A PREROUTING -i eth1 -p tcp --sport 80 -j DNAT --to 77.77.77.77:80
I need to do this urgently and would require your precious contribution.
Regards
Joel 9820533294 (022) 56346700
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