ARGH. Sorry about my premature previous post...lemme try this again...
Hi again,
In looking through the mail archive, i see this thread,
http://lists.netfilter.org/pipermail/netfilter/2004-November/057098.html
which answered my question.
I verified that the kernel had IP_NF_NAT_LOCAL set to y, and i see that
I was missing the "iptables -t nat -A OUTUPT" line. Everything works
now. Whoohoo!
Thanks.
...alex...
Alex Tang wrote:
Hi folks.
I'm using a nat PREROUTING rule to forward all connections from port
25 to port 2000. This works fine for all addresses except for localhost.
the rule i'm using is: "-A PREROUTING -p tcp -m tcp --dport 25 -j
REDIRECT --to-ports 2000" (CentOS4, kernel 2.6.9-55, iptables-1.2.11)
For example, on my machine: foobar.example.com
If i telnet from any machine other than foobar.example.com to
foobar.example.com:25, the connection is redirected properly to
foobar.example.com:2000.
However, if i telnet from foobar.example.com to localhost:25, i get a
connection refused.
Telnetting to from foobar.example.com to localhost:2000 works fine (as
expected)
Telnetting from foobar.example.com to foobar.example.com:25 also does
not work.
I know that you can't do prerouting from localhost -> some.other.host
(or vice versa), but i thought localhost->localhost would work.
Am i screwing up the rule? Should I add another rule? Or am i just SOL.
Thanks.
...alex...
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