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Author Message
 Firewall and sendmail
Hi

I've installed some scripts to check my logs and mail them to my regular
user account and root, I didn't have sendmail installed because of the
security risks and didn't think it was needed for emails within my box.  As
it turned out it is needed so I installed sendmail.  The problem is that my
firewall lets connections to port 25 that respond to commands. I added  a
rule to specifically close port 25 but wasn't able to close the port.  A
similar problem occurs on 515 (lpd port).  Is there a way to setup mail w/o
sendmail to send mails within my box and how can I restrict access to the
lpd port.
The setup is to DENY everything and ACCEPT only ports that I allow, which
doesn't include 25 or 515.

Thnx in advance.

Guy



 Fri, 02 Aug 2002 03:00:00 GMT   
 Firewall and sendmail

Go to the following website and it will produce a custom firewall script
for you based on answers to some simple questions.

http://linux-firewall-tools.com/linux/firewall/index.html
--
Prasanth Kumar
kum...@home.com



 Fri, 02 Aug 2002 03:00:00 GMT   
 Firewall and sendmail

Watch out for prebuilt firewall scripts..  I found that mine had by
default denied all, allowed some, but also allowed all from ports >1024
to ports >1024!  So anything above 1024 was open unless I specifically
blocked it.

The part that opened the firewall wide-open was for passive FTP
transfers, I'm still trying to figure out how to set up the firewall to
allow passive transfers without such a huge opening.

--
Walter Francis
http://wally.hplx.net                      Powered by Red Hat Linux 6.0



 Fri, 09 Aug 2002 03:00:00 GMT   
 Firewall and sendmail

This built me a tight ipchain firewall rule set
   http://linux-firewall-tools.com/linux/firewall/index.html
I used DENY, hardcoded external addresses, logged everything.

As part of the instruction and if you read the script, it will
give several suggestions as to where you install the firewall.

--
The warrenty and liability expired as you read the message.
If the above breaks your system, it's yours and you keep both pieces.
Practice safe computing. Backup the file before you change it.
Do a,  man every_command_here, before doing anything or running a script.



 Sat, 10 Aug 2002 03:00:00 GMT   
 
   [ 4 post ] 

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