Problem using -p udp

Problem using -p udp

[Phil Sutter]

Hi,

I have been using Iptables on linux 2.4.26 for several years. I am
running on an Axis platform (cris architecture). Recently I started
moving my application to 2.6.19 and am using iptables 1.3.7. When I try
to use the sample rules shown below from my old environment, they fail
with an invalid parameter. The parameter causing the issue is the "udp"
associated with the "-p".  If I issue the same rule with a "-p tcp" they
work fine. Could someone explain why  "-p udp"  will not work?

/sbin/iptables -t nat -A PREROUTING -i ppp0 -p udp --dport 80 -j
REDIRECT --to-port 6383

/sbin/iptables -t nat -A PREROUTING -i ppp0 -p udp --dport 90 -j DNAT
--to 192.168.1.122:80


Thank you,

Phil

Re: Problem using -p udp

[Покотиленко Костик]

В Вск, 19/08/2007 в 15:37 -0700, Phil Sutter пишет:
> Hi,
> 
> I have been using Iptables on linux 2.4.26 for several years. I am
> running on an Axis platform (cris architecture). Recently I started
> moving my application to 2.6.19 and am using iptables 1.3.7. When I try
> to use the sample rules shown below from my old environment, they fail
> with an invalid parameter. The parameter causing the issue is the "udp"
> associated with the "-p".  If I issue the same rule with a "-p tcp" they
> work fine. Could someone explain why  "-p udp"  will not work?
> 
> /sbin/iptables -t nat -A PREROUTING -i ppp0 -p udp --dport 80 -j
> REDIRECT --to-port 6383
> 
> /sbin/iptables -t nat -A PREROUTING -i ppp0 -p udp --dport 90 -j DNAT
> --to 192.168.1.122:80

I have just tryed your rules on my Debian Etch box with kernel 2.6.18
and iptables 1.3.6 and they worked out.

Did you built your kernel and iptables youself? This case you probably
have forgotten to enable something.

-- 
Покотиленко Костик <casper@meteor.dp.ua>