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Linux - Networking This forum is for any issue related to networks or networking.
Routing, network cards, OSI, etc. Anything is fair game.

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Old 11-30-2004, 03:44 PM   #1
drumlix18
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Registered: Oct 2004
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blocking and allowing ports


how would i go about making a small custom firewall? i have a txt file containing a list of ports along with an action stating whether to allow an IN, OUT, or BOTH connection. i understand i need to create a system call and/or modify the tcp_v4_rcv function but am unclear. can someone help me along or assist me in another approach? thanks!
 
Old 11-30-2004, 04:04 PM   #2
masand
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Registered: May 2003
Location: INDIA
Distribution: Ubuntu, Solaris,CentOS
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hi there

shorewall is easy and a good firewall
have look at
shorewall.org and chek out its docs

regards
 
Old 11-30-2004, 04:16 PM   #3
drumlix18
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thanks but i dont want a program. i need to make it myself (its also for a project) and i'm relatively new to linux. i just need to understand how to block and allow ports using the structaddr module
 
Old 11-30-2004, 04:24 PM   #4
jonr
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Registered: Jan 2003
Location: Kansas City, Missouri, USA
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Guarddog (which requires some of the KDE stuff, but not the KDE desktop) is what I use. It makes it easy to customize iptables however you want your firewall set up.
 
Old 11-30-2004, 07:36 PM   #5
SoccerDad
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Registered: Nov 2004
Location: Ontario, Canada
Distribution: Mepis
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Everything you need to know --> Netfilter
 
  


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