Mailing List Archive: change from eth0 ---- router interface , to ppp0 --- ethernet modem interface

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I finally changed device to connect to internet on my gateway linux box
, from a netgear router to an ethernet modem device.
Offcourse occourred some changes in my iptables script , what before was
192.168.0.2 ip for eth0 and 192.168.0.1 for my front router now has a
eth0 with no ip and a ethernet router with my dynamic isp ip i grab with
this script :

> EXTIF=ppp0
> EXTIP="`ifconfig $EXTIF | grep inet | cut -d : -f 2 | cut -d \ -f 1`"

- -------
behind my gateway linuxbox (Debian etch) i have two more servers a mail
server and a web ftp server .Mail is working great with this iptables:
> ARGO="`ifconfig ppp0 | grep inet | cut -d : -f 2 | cut -d \ -f 1`"
> $IPT -t nat -A PREROUTING -p tcp -i $IF0 -d $ARGO --dport 25 -j DNAT --to $MAIL:25
> $IPT -A FORWARD -i $IF0 -o $IF1 -p tcp --dport 25 -d $MAIL -j ACCEPT

I have problems with http e https where i'm using this code:
> IF0=ppp0
> IF1=eth1
> $IPT -t nat -A PREROUTING -p tcp -i $IF0 -d $ARGO --dport 80 -j DNAT --to $WWW:80
> $IPT -t nat -A PREROUTING -p tcp -i $IF0 -d $ARGO --dport 443 -j DNAT --to $WWW:443
> $IPT -A FORWARD -i $IF0 -o $IF1 -p tcp --dport 80 -d $WWW -j ACCEPT
> $IPT -A FORWARD -i $IF0 -o $IF1 -p tcp --dport 443 -d $WWW -j ACCEPT

I'm using apache2 with mod_rewrite rewriting connecions from port 80 to 443.
What's wrong with my configuration ? I will try to remove that -d $ARGO
like this:
>$IPT -t nat -A PREROUTING -p tcp -i $IF0 --dport 80 -j DNAT --to $WWW:80
>$IPT -t nat -A PREROUTING -p tcp -i $IF0 --dport 443 -j DNAT --to $WWW:443
And invite you to give it a try http://www.gabrix.ath.cx let's see how
it goes.
Thanks for the attenction !
gabriele

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On 08/14/07 15:32, gabrix wrote:
> ARGO="`ifconfig ppp0 | grep inet | cut -d : -f 2 | cut -d \ -f 1`"
> $IPT -t nat -A PREROUTING -p tcp -i $IF0 -d $ARGO --dport 25 -j DNAT
> --to $MAIL:25
> $IPT -A FORWARD -i $IF0 -o $IF1 -p tcp --dport 25 -d $MAIL -j ACCEPT
>
> I have problems with http e https where i'm using this code:
>
> IF0=ppp0
> IF1=eth1
> $IPT -t nat -A PREROUTING -p tcp -i $IF0 -d $ARGO --dport 80 -j DNAT
> --to $WWW:80
> $IPT -t nat -A PREROUTING -p tcp -i $IF0 -d $ARGO --dport 443 -j DNAT
> --to $WWW:443
> $IPT -A FORWARD -i $IF0 -o $IF1 -p tcp --dport 80 -d $WWW -j ACCEPT
> $IPT -A FORWARD -i $IF0 -o $IF1 -p tcp --dport 443 -d $WWW -j ACCEPT

I do not see any thing wrong with the IPTables rules that you have
presented. However apparently something else is preventing things from
working correctly.

> I'm using apache2 with mod_rewrite rewriting connecions from port 80
> to 443. What's wrong with my configuration ? I will try to remove
> that -d $ARGO like this:

I am curious if you see any traffic comming in to your web server at
all, be it via netstat, TCPDump, logs, etc.

I also wonder what else may be in your IPTables rules that is not
presented that may be causing problems. Can / will you do an
iptables-save and show us the output of your entire IPTables configuration?

> And invite you to give it a try http://www.gabrix.ath.cx let's see
> how it goes.
>
> Thanks for the attenction !

*nod*

Grant. . . .