ER: ipmasq+DNS+sendmail

[runner@matavnet.hu]

Hi all ! (Sorry, it will last long !)

Please, help me ASAP ! I have to get our system out to the Internet 
and I want to build a secure system. So, I've read the HOWTOs 
and the brilliant TrinityOS, but so many thing focuses on RH or RH 
based systems. Ok, what we have: we have poor dialup connection 
over analog lines (it soon will be ISDN, I hope), one e-mail address 
at the ISP (we don't have registreted domain, we collect the letters 
into one box and redirect the mail to the workers by the subject 
line, because our clients identify themseves by the subject line) 
and 13 machines. I have understood the importance of the IP 
masquarading and created a firewall script, from the TrinityOS. And 
I installed the ipmasq. What to do with the other defs and rules ? 
Simly delete them and put only the firewall.rul into the 
/etc/masq/rules ? I also want that the firewall get initialised with the 
correct external IP address. I get the ppp file under /etc/ipmasq bur 
will it pass the correct IP to the script ? I use the scripts above to 
identify the ext IP and such things:
EXTIP=`/sbin/ifconfig | grep -A 4 $EXTIF | awk 
'/inet/ { print $2 } ' | sed -e s/addr://`

EXTBROAD=`/sbin/ifconfig | grep -A 1 $EXTIF | 
awk '/Bcast/ { print $3 }' | sed -e s/Bcast://`

EXTGW=`/sbin/route -n | grep -A 4 UG | awk '{ 
print $2}'`

I also want to use sendmail and deliver the 
local mails immediately and send the outbound 
mail to a queue to deliver later. I only want to 
relay for local domain (192.168.1) and because I 
want to set up a DNS on LAN (let say, it will be 
office.org) I have to transform the address to 
myname@myisp.com from anybody@office.org. Is it 
possible ? So, that was all. Sorry to the gurus, 
I'm just a begginner and if you tell me an URL 
where I can get Debian specific info about 
building a system like this I will get there and 
read all the RTFMs. Please cc xour answers to my 
private e-mail address, because I get the list 
in digest mode (and I just subscribed).
Million thanks,
Ago

"If you love somebody set them free..."
Sting is GPL fan :-)