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Top Forums UNIX for Advanced & Expert Users Forwarding internal internet packets to internal webserver using iptables Post 302257379 by angeloio on Wednesday 12th of November 2008 03:10:33 AM
Old 11-12-2008
transparent proxying

Hi,

If I understand what you want it is called transparent proxying and can be achieved with something like the following:
$IPTABLES -t nat -A PREROUTING -i $INTERNAL_IFACE -p tcp --dport 80 -j REDIRECT --to-port 3128
or you can redirect to any other port you like (the above implies redirection to the same machine).
If you want to redirect on another ip then you have to do something like the following:
$IPTABLES -t nat -A PREROUTING -i $INTERNAL_IFACE -p tcp -d <original dest ip> -j DNAT --to <new dest ip>

Hope this helps
 

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IPTABLES-SAVE(8)						  iptables 1.6.1						  IPTABLES-SAVE(8)

NAME
iptables-save -- dump iptables rules to stdout ip6tables-save -- dump iptables rules to stdout SYNOPSIS
iptables-save [-M modprobe] [-c] [-t table] ip6tables-save [-M modprobe] [-c] [-t table] DESCRIPTION
iptables-save and ip6tables-save are used to dump the contents of IP or IPv6 Table in easily parseable format to STDOUT. Use I/O-redirect- ion provided by your shell to write to a file. -M, --modprobe modprobe_program Specify the path to the modprobe program. By default, iptables-save will inspect /proc/sys/kernel/modprobe to determine the exe- cutable's path. -c, --counters include the current values of all packet and byte counters in the output -t, --table tablename restrict output to only one table. If not specified, output includes all available tables. BUGS
None known as of iptables-1.2.1 release AUTHORS
Harald Welte <laforge@gnumonks.org> Rusty Russell <rusty@rustcorp.com.au> Andras Kis-Szabo <kisza@sch.bme.hu> contributed ip6tables-save. SEE ALSO
iptables-apply(8),iptables-restore(8), iptables(8) The iptables-HOWTO, which details more iptables usage, the NAT-HOWTO, which details NAT, and the netfilter-hacking-HOWTO which details the internals. iptables 1.6.1 IPTABLES-SAVE(8)
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