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Old 10-15-2001, 03:07 PM   #1
LQ Newbie
Registered: Jun 2001
Location: Frankfort, IL
Distribution: Suse 7.1
Posts: 9

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ipchains & dhcp for internal network

I am trying to configure dhcp for my internal network and am having trouble with my firewall blocking it. I am using ipchains (configured through "newbie" settings on webmin at "low" setting) and have the following text show up when logging:

DHCPDISCOVER from 00:a0:cc:73:bb:d2 via eth1
DHCPOFFER on to 00:a0:cc:73:bb:d2 via eth1
send_packet: Operation not permitted

My internal (LAN) interface is eth1 with an IP of I've set up the dhcp script to lease from a range of to

Here's the section labeled for DHCP rules in my firewall script:

ipchains -A input -i eth1 -s 68 -d 67 -p udp -j ACCEPT
ipchains -A output -i eht1 -s 67 -d 68 -p udp -j ACCEPT

When I turn off the firewall, the dhcp stuff works like a charm, but as soon as I turn the firewall back on, the clients can't grab an IP from the dhcp server.

Any thoughts on what to do to fix the ipchains?
Old 10-15-2001, 08:29 PM   #2
LQ Newbie
Registered: Jun 2001
Location: Frankfort, IL
Distribution: Suse 7.1
Posts: 9

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Smile fixed it!

edit second line to be:

ipchains -A output -i eth1 -s 67 -d 68 -p udp -j ACCEPT


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