kubuntu-users Digest, Vol 12, Issue 48

Jordi Ferrando jferrando at netplc.com
Sun Jan 29 10:56:41 GMT 2006

Hi C Hamel,

Your script if straight-forward implementation, and I am sure it works 
good for you.
Anyway, if you are interested, for more refined init.d scripting, take a 
look at:


C Hamel wrote:

>On Friday January 27 2006 03:45, kubuntu-users-request at lists.ubuntu.com wrote:
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>>Today's Topics:
>>   1. Resizing the Desktop (Russ)
>>   2. ctrl e fn keys (Alessandro Pironi)
>>   3. Re: Katapult (Tobi Vollebregt)
>>   4. Re: NAT & bash questions (Jordi Ferrando Fabra)
>>   5. Re: kubuntu Dapper: kded crashes 'CppSQLite3Exception'
>>      -SOLVED (Bharat Rajagopalan)
>>Date: Fri, 27 Jan 2006 10:37:06 +0100
>>From: Jordi Ferrando Fabra <jferrando at netplc.com>
>>Subject: Re: NAT & bash questions
>>To: Kubuntu Help and User Discussions <kubuntu-users at lists.ubuntu.com>
>>Message-ID: <43D9E9C2.9010706 at netplc.com>
>>Content-Type: text/plain; charset="iso-8859-1"
>>I use an own-written init script to enable iptables at start-up:
>I am intrigued by your script even if I am having trouble following it.  I am 
>not terribly script-savvy, I fear.  (I may be moderately good at some things, 
>but scripting is not one of them.)  The script I put together was taken from 
>my last distro, and works great.  The only rub is that I really have not much 
>of an idea how to write debian-friendly scripts that one can 
>stop,start,restart,force-restart, etc. 
> Mine looks like this:
>#Set up IPTABLES here, since it is problematic where to place the startup
>#First we flush our current rules
> iptables -F
> iptables -t nat -F
>#Setup default policies to handle unmatched traffic
> iptables -P INPUT ACCEPT
> iptables -P OUTPUT ACCEPT
> iptables -P FORWARD DROP
>#Copy and paste these examples ...
> export LAN=eth0
> export WAN=ppp0
>#Then we lock our services so they only work from the LAN
> iptables -I INPUT 1 -i ${LAN} -j ACCEPT
> iptables -I INPUT 1 -i lo -j ACCEPT
> iptables -A INPUT -p UDP --dport bootps -i ! ${LAN} -j REJECT
> iptables -A INPUT -p UDP --dport domain -i ! ${LAN} -j REJECT
>#(Optional) Allow access to our ssh server from the WAN
> iptables -A INPUT -p TCP --dport ssh -i ${WAN} -j ACCEPT
>#Drop TCP / UDP packets to privileged ports
> iptables -A INPUT -p TCP -i ! ${LAN} -d 0/0 --dport 0:1023 -j DROP
> iptables -A INPUT -p UDP -i ! ${LAN} -d 0/0 --dport 0:1023 -j DROP
>#Finally we add the rules for NAT
> iptables -I FORWARD -i ${LAN} -d -j DROP
> iptables -A FORWARD -i ${LAN} -s -j ACCEPT
> iptables -A FORWARD -i ${WAN} -d -j ACCEPT
> iptables -t nat -A POSTROUTING -o ${WAN} -j MASQUERADE
>#Tell the kernel that ip forwarding is OK
> echo 1 > /proc/sys/net/ipv4/ip_forward
> for f in /proc/sys/net/ipv4/conf/*/rp_filter ; do echo 1 > $f ; done
>Finally, I enable ppp0-on-demand (note: no wireless where I live, it's still a 
>#Enable on-demand ppp0
>/usr/sbin/pppd call sc2k
>I'd be very interested in your insight.

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