p3scan does not seem to be working.

linuxlover.chaitanya · 06-15-2010, 04:37 AM

Hello all,

I have a server running CentOS5.5 Final and squid. I need some kind of mail proxy for pop3 so that I can use squid in non transparent mode and still allow clients to use mail clients.
I found p3scan and installed it successfully. Downloaded the tar file and installed from source. The version is 2.3.2 stable and got it from sourceforge and softpedia both. (Yes, I have two copies)
After installation, I used iptables rules, as stated in the documentation, to use it as transparent pop proxy.
But the redirection does not seem to work and mail clients are not able to connect to the pop server.
The squid server is behind an ADSL modem router.

iptables rules for redirection

Code:

iptables -t nat -A PREROUTING -p tcp -i eth0 --dport pop3 -j REDIRECT --to-ports 8110

The same rules are for smtp and pop3s though I do not need the later.

lsof -i shows that p3scan is listening on the specified port.

Any help would be appreciated.

linuxlover.chaitanya · 06-16-2010, 07:36 AM

What I have noticed is that the above rules does not work for transparent squid as well. So I think the entire port forwarding is not working.

Code:

iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 80 -j REDIRECT --to-ports 3128

is not working either.

But ip forwarding is activated in sysctl.conf file and it shows as well.

Code:

cat /proc/sys/net/ipv4/ip_forward

gives

Code:

But neither squid nor p3scan is working transparently.

Any guesses why?