Using NAT with multiple protocols

Tue, 26 Apr 2005 18:42:43 -0700 

Hi,

I'm trying to NAT this protocols: HTTPS, FTP (active and passive), NTP, SSH, SMTP, POP3, POP3S, IMAP and IMAPS. But I'm not sure if I'm doing it right.

# This is my network config:
# Internal network: 192.168.0.0/24
# External IP: 193.135.345.123

# NAT for HTTPS, FTP (active and passive), SSH, SMTP, POP3, POP3S, IMAP and IMAPS.
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -p tcp -m multiport --dports 443,21,20,22,25,110,995,143,993 -j SNAT --to-source 193.135.345.123

# NAT for NTP.
iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -p upd -m multiport --dports 123 -j SNAT --to-source 193.135.345.123


I have also loaded these modules:
modprobe ip_conntrack
modprobe ip_conntrack_ftp
modprobe ip_nat_ftp


Thanks,
  Patr�cio Batista
  Portugal.

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