Invalid Argument

Invalid Argument

[João Carlos Garcia]

Hi, 

I´m trying to configure iptables rules, but ...
I´m testing the rules in a separeted environment, but the final topology will be the following
ADSL -- [ LINUX ] -- LOCAL NETWORK

The script look like this

    #!/bin/sh
    INTIF=eth0
    EXTIF=eth1
    INTIP=192.168.0.3
    EXTIP=172.16.0.3

    echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp
    echo 1 > /proc/sys/net/ipv4/conf/eth1/proxy_arp
    echo 1 > /proc/sys/net/ipv4/ip_forward
    for f in /proc/sys/net/ipv4/conf/*/rp_filter; 
    do 
    echo 1 > $f; 
    done

    iptables -F INPUT
    iptables -F OUTPUT
    iptables -F FORWARD
    iptables -A INPUT -j DROP
    iptables -A FORWARD -j DROP
    iptables -A OUTPUT -j DROP
    ...

    iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o $EXTIF -j SNAT --to-source $EXTIP

When the script run the last rule ( NAT ), occurs an error : iptables invalid argument.
I want that the iptables change the source IP address ( 192.168 ) to his ip address ( 172.16.0.3 ) to all connection to Internet

Could anyone help me ?
Thanks in advanced
João Carlos




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Re: Invalid Argument

[Jose Maria Lopez]

El lun, 06 de 09 de 2004 a las 14:48, João Carlos Garcia escribió:
> Hi, 
> 
> I´m trying to configure iptables rules, but ...
> I´m testing the rules in a separeted environment, but the final topology will be the following
> ADSL -- [ LINUX ] -- LOCAL NETWORK
> 
> The script look like this
> 
>     #!/bin/sh
>     INTIF=eth0
>     EXTIF=eth1
>     INTIP=192.168.0.3
>     EXTIP=172.16.0.3
> 
>     echo 1 > /proc/sys/net/ipv4/conf/eth0/proxy_arp
>     echo 1 > /proc/sys/net/ipv4/conf/eth1/proxy_arp
>     echo 1 > /proc/sys/net/ipv4/ip_forward
>     for f in /proc/sys/net/ipv4/conf/*/rp_filter; 
>     do 
>     echo 1 > $f; 
>     done
> 
>     iptables -F INPUT
>     iptables -F OUTPUT
>     iptables -F FORWARD
>     iptables -A INPUT -j DROP
>     iptables -A FORWARD -j DROP
>     iptables -A OUTPUT -j DROP
>     ...
> 
>     iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o $EXTIF -j SNAT --to-source $EXTIP
> 
> When the script run the last rule ( NAT ), occurs an error : iptables invalid argument.
> I want that the iptables change the source IP address ( 192.168 ) to his ip address ( 172.16.0.3 ) to all connection to Internet
> 
> Could anyone help me ?
> Thanks in advanced
> João Carlos

The rule is correct, I write it in my system and it works, so you
probably have a problem of not having synced the iptables userspace
tools and the kernel space or something similar.

-- 
Jose Maria Lopez Hernandez
Director Tecnico de bgSEC
jkerouac@bgsec.com
bgSEC Seguridad y Consultoria de Sistemas Informaticos
http://www.bgsec.com
ESPAÑA

The only people for me are the mad ones -- the ones who are mad to live,
mad to talk, mad to be saved, desirous of everything at the same time,
the ones who never yawn or say a commonplace thing, but burn, burn, burn
like fabulous yellow Roman candles.
                -- Jack Kerouac, "On the Road"

Re: Invalid Argument

[Jason Opperisano]

On Mon, 2004-09-06 at 08:48, João Carlos Garcia wrote:
>     iptables -t nat -A POSTROUTING -s 192.168.0.0/24 -o $EXTIF -j SNAT --to-source $EXTIP
> 
> When the script run the last rule ( NAT ), occurs an error : iptables invalid argument.
> I want that the iptables change the source IP address ( 192.168 ) to his ip address ( 172.16.0.3 ) to all connection to Internet
> 
> Could anyone help me ?
> Thanks in advanced
> João Carlos

my guess is you've compiled a custom kernel, possibly applied some POM
patches, and you have not recompiled the iptables userspace utilities.

-j

-- 
Jason Opperisano <opie@817west.com>

invalid argument

[Luis GUSTAVO]

Hi people,

i´m using the follow rule:
iptables -t nat -A POSTROUTING -o eth0 -J MASQUERADE
invalid argument

what is this... my rule is ok.

thank you



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Re: invalid argument

[Patrick Leslie Polzer]

On Mon, 5 Jul 2004 08:59:54 -0300 (ART)
Luis GUSTAVO <lgpcf@yahoo.com.br> wrote:

> i´m using the follow rule:
> iptables -t nat -A POSTROUTING -o eth0 -J MASQUERADE
> invalid argument
> 
> what is this... my rule is ok.
No. It has to be a lower-case 'j'.

Leslie