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Old 09-30-2006, 05:00 PM   #1
bluel1te
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Registered: Jan 2006
Location: Australia
Distribution: Slackware 10.2
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Iptables & Dhcp


Hi,

I am using Slackware 10.2 and was playing around with my iptables rules file and noticed that even if I enter only one rule in my rules file - iptables -A INPUT -j DROP - I notice that when the PC boots it is still able to get a DHCP IP from my router. I created a rc.firewall file in the etc/rc.d folder so the rules are implemented when I boot.

I may be missing something here but I thought if I had only the above rule in my rules file, even DHCP requests would be blocked when the PC boots. Can anyone shed any light on this for me??

Thanks.
 
Old 09-30-2006, 05:06 PM   #2
chadl
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Registered: Sep 2005
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Distribution: Gentoo AMD64 Testing
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DHCP is not affected by the IPTables settings, because it binds directly to the network interface in much the same way as a packet monitor does (this is one of the reasons you need to run it as root).

Last edited by chadl; 09-30-2006 at 05:07 PM.
 
Old 09-30-2006, 07:13 PM   #3
//////
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Registered: Nov 2005
Location: Land of Linux :: Finland
Distribution: Dual boot :: Slackware 14.1 64bit multilib | Kali linux 64bit multi lib
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Quote:
Originally Posted by chadl
DHCP is not affected by the IPTables settings
If that is the case it explains/solves my problems concerning bootps/dhcp, thanks for that info.
 
  


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