I am using FreeBSD 6.3-RELEASE, Sendmail & SQUID 2.7.STABLE6, on one machine with following enabled in /etc/rc.conf for NAT and Firewall
for NAT another file /etc/ipnat.rules
map em0 172.16.0.0/23 -> 0/32
rdr fxp0 0/0 port 80 -> 127.0.0.1 port 8080 tcp
em0 (is connected to DSL with Public Static IP) and
fxp0 (is connected to LAN with Private Static IP).
All of my traffic on LAN interface is directly forwarded to WAN Interface. Due to which in case of Virus Attack & SPAMs all the traffic is directly forwarded on internet, and Static IPs configured get black listed on the web.
Kindly guide, how can I block the attacks to pass on from my network to the internet.
As this is Proxy and Mail Server so how can I only allow NAT for 80 Port Traffic, for 21 port for FTP and what configuration is required for Mail Server.
Taking care of your Linux box.
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