iptables for ADSL

iptables for ADSL

[Alejandro Cabrera Obed]

Hi people !!!

I have a basic doubt: I want to connect my Linux with iptables to Intrenet
via ADSL. Just one question:

Do I have to set
echo "1" > /proc/sys/net/ipv4/ip_dynadrr
in order to work with dynamic addresses asigned by my ISP ????

Thanks a lot

Ale

Re: iptables for ADSL

[Antony Stone]

On Friday 21 November 2003 7:25 pm, Alejandro Cabrera Obed wrote:

> Hi people !!!
>
> I have a basic doubt: I want to connect my Linux with iptables to Intrenet
> via ADSL. Just one question:
>
> Do I have to set
> echo "1" > /proc/sys/net/ipv4/ip_dynadrr
> in order to work with dynamic addresses asigned by my ISP ????

I have a dynamic IP cable modem connection and I've never done this.

Antony.

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Re: iptables for ADSL

[Tim Evans]

On Fri, 21 Nov 2003 19:29:28 +0000, Antony Stone wrote
> On Friday 21 November 2003 7:25 pm, Alejandro Cabrera Obed wrote:
> 
> > Hi people !!!
> >
> > I have a basic doubt: I want to connect my Linux with iptables to Intrenet
> > via ADSL. Just one question:
> >
> > Do I have to set
> > echo "1" > /proc/sys/net/ipv4/ip_dynadrr
> > in order to work with dynamic addresses asigned by my ISP ????

You just need to capture your dynamically assigned IP address at iptables
startup time and use it in your rules.  I have the following variable
assignment in my RH 7.3 startup sdript (all one line):

INET_IP=`ifconfig eth1 | grep 'inet addr' | awk -F":" '{print $2}' | sed 's/ 
Bcast//'`

Then just use $INET_IP in your rules.
--
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Re: iptables for ADSL

[Ramin Dousti]

On Fri, Nov 21, 2003 at 04:25:06PM -0300, Alejandro Cabrera Obed wrote:

> Hi people !!!
> 
> I have a basic doubt: I want to connect my Linux with iptables to Intrenet
> via ADSL. Just one question:
> 
> Do I have to set
> echo "1" > /proc/sys/net/ipv4/ip_dynadrr
> in order to work with dynamic addresses asigned by my ISP ????

Take a look at Documentation/networking/ip_dynaddr.txt of your
kernel source tree.

In short you do not need this.

Ramin

> 
> Thanks a lot
> 
> Ale
>