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Re: port _redirection_ within single machine

Use "targets SNAT and DNAT, not REDIRECT".  Also try something that
matchs, use '-vL' too see what is going on.

# iptables -t nat -I PREROUTING <SKIP?: --src <REPLACE:>>
--dst <REPLACE:> -p tcp --dport 80 -j DNAT --to-destination

--- Martin Slouf <xslom03@vse.cz> wrote:

> Hi all,
> im newbie in firewall building and iptables; ive started to read the
> documentation recently, but no answer found yet for a problem on a port
> redirecting. help me pls.
> My computer is running tomcat on 8080, no web server there. tomcat is
> running as a separate user (tomcat).
> I would like to have all requests to port 80 (nothing there) being
> redirected to 8080 (tomcat waiting) _within_ the same machine.
> I think i have the possibility of starting tomcat as the root user,
> gain control over privilleged port 80 and then drop privilleges and
> continue running as the unprivilleged user (tomcat). (am i right? im
> using 'start-stop-daemon' and from the man page im not sure i can do
> this -- it seems it drops privilleges _before_ starting the process --
> anyway, this solution is satisfying, but not ideal.)
> so far so good.
> The problem is that users have already got accustomed to the port 8080;
> so i want to keep tomcat running on 8080 and for any new users i want
> port 80 being redirected from port 80 to 8080 transparently.
> i created this rule for port redirection, but it does not do what i
> expect. any solutions or suggestions why? (googling always ends with
> port forwarding / masquarading issues (targets SNAT and DNAT, not
> iptables -t nat -I PREROUTING --src 0/0 --dst \
> -p tcp --dport 80 -j REDIRECT --to-ports 8080
> maybe a clue?
> im browsing kernel documentation now -- maybe
> option CONFIG_IP_NF_NAT_LOCAL is the answer (all my testing _must_ be
> done locally -- computer is not connected to network now)?
> thx for any help.
> martin.
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