Basic DHCP Question

bfloeagle · 08-23-2000, 02:48 PM

I have two ethernet cards installed on my Linux (RH 6.2) box running a DHCP server. DHCPD tells me that it is listening for requests on both of my cards.

I want it to only listen to requests on the ethernet card that is for my internal network (eth0) so people from the internet (connected via my second ethernet card - eth1) do not get a response from my DCHP server and so I dont get busted for running a server behind my ISP... ;-)

How do I tell DHCPD to only use eth0?

jeremy · 08-23-2000, 06:52 PM

When you start dhcpd start it with:

Code:

dhcpd [options] eth0

If you don't specify an interface name on the command line dhcpd will identify all network interfaces that are up.

bfloeagle · 08-23-2000, 07:19 PM

Is there a way to make DHCPD do that when it first loads at bootup?

(Because I am Newbie and have no clue - What does [options] mean in the command you gave me?)

jeremy · 08-23-2000, 07:57 PM

If you need to start the server with any options you would insert them before the eth0. If you are reading a man page or a help file and you see [anything] it usually means it is optional (but NOT always). You should have a startup script in /etc/rc.d/init.d/ (probably named dhcpd). Open it up in your favorite text editor and add the eth0.