From juansm at fibertel.com.ar  Tue Aug  5 08:40:35 2003
From: juansm at fibertel.com.ar (Juan Salvador)
Date: Tue, 5 Aug 2003 12:40:35 -0300
Subject: [NARC] Dynamic IP & Custom Conf Variables
Message-ID: <000001c35b67$eb6108f0$0500a8c0@sagitario>

Hi! I'm new to the list. I'm running narc in my home gateway, under slack 9.
My question is, How can I properly use variables in narc-custom.conf so that
if my EXT_INT_IP changes I don't have to perform the annoying task of
modifying every single line (there are many... trust me) in which my ext. ip
is mentioned?
 
The main config as well as the port forwarding options seem to be working
allright. However, as 3 of my home terminals run under win32 platforms, I
need some custom commands due to program specifications which narc-forward
can't address. My cablemodem provider gives me only one dynamic IP, and it's
such a fuzz when it changes and programs based on port forwarding stop
working or loose performance.
 
I've noticed the following in the main script, regarding the
EXTERNAL_INTERFACE_IP variable related to the FORWARD_CONF variable:
if [ "$PORT_FORWARD" == 'yes' ] ; then
        for var in `grep -v "^ *#" $FORWARD_CONF | strings` ; do
                PROTOCOL=`$ECHO $var | cut -d \" -f2`
                ORIG_IP=`$ECHO $var | cut -d \" -f4`
                ORIG_PORT=`$ECHO $var | cut -d \" -f6`
                NEW_IP=`$ECHO $var | cut -d \" -f8`
                NEW_PORT=`$ECHO $var | cut -d \" -f10`
                if [ "$ORIG_IP" == 'AUTOGET_EXTERNAL_IP' ] ; then
                        ORIG_IP="$EXTERNAL_INTERFACE_IP"
 
My question is, then:
Is there any way in which I can use EXTERNAL_INTERFACE_IP in my
narc-custom.conf ?
If no, then is there a way in which I can declare a variable in the
narc-custom script and then use it along the rest of it?
 
Thank you so much for your attention and SALUDOS DESDE ARGENTINA !!!
 
Juan Salvador Mayedonchi
juansm at fibertel.com.ar
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From j.brosens at chello.nl  Thu Aug 21 04:18:59 2003
From: j.brosens at chello.nl (Jeroen Brosens)
Date: Thu, 21 Aug 2003 13:18:59 +0200
Subject: [NARC] Unable to do portforwarding on Debian? Check if you have binutils (strings) installed!
Message-ID: <000301c367d6$047fea20$0200a8c0@thunderbird>

For the past few days I have been struggling with setting up port
forwarding and found out that on a clean install of Debian 3.0r1
(without binutils), the file /usr/bin/strings is missing, and that is
what NARC needs (for extracting the port forwarding lines from the
narc-forward.conf). If you open the narc script, do a search for
'strings'; you'll find the port-forwarding section here.

 

During a 'narc start' I got the message "/usr/sbin/narc: strings:
command not found" and then NARC tells me "No ports to forward! Check
your /etc/narc/narc-forward.conf" and it bombs out with a "Something bad
happened!". 

 

It took me quite some time to find out by chance that when I apt-getted
binutils, the error was gone. Binutils installs the /usr/bin/strings
file that is needed.

 

Btw, I mentioned this to Shane Chen and he said he will make sure a
check for this is incorporated in the next release.

 

Kind regards from the Netherlands,

Jeroen Brosens

 

 

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From support at earthtravel.net  Thu Aug 21 19:19:23 2003
From: support at earthtravel.net (support at earthtravel.net)
Date: Thu, 21 Aug 2003 19:19:23 -0700
Subject: [NARC] How to let a private IP address in?
In-Reply-To: <20030821132704.15857.25742.Mailman@moles>
Message-ID: <5.2.1.1.0.20030821191808.01885f10@mail.earthtravel.net>

How can I let a private IP address in lets say 192.168.2.5? I have tried to 
let it in via the custom script
iptables -I TCP_CHK 3 -p tcp -s 192.168.2.5 -i eth0 -j ACCEPT


It seems to have already been dropped by the Anti Spoofing rule by the time 
the custom script rules apply.

Thanks.

-mag
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