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dhcpd.conf setup question

Posted on 2004-09-27
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Last Modified: 2008-01-09
I have slackware 10 installed on my box with 2 nics.

eth0 is to be used for the internal LAN
eth1 is connected to the internet.

I need a simple configuration for dhcpd.conf that will give out IP's to the local LAN via eth0. Does anybody know of an example file that can used.?

This also needs to be set up so that no IP's are sent via eth1 by mistake.
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Question by:theaussie
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4 Comments
 
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Expert Comment

by:jlevie
ID: 12159951
# Global options
option domain-name "your-domain.tld";
option domain-name-servers 10.0.0.1;
                                                                               
authoritative;
ddns-update-style none;
                                                                               
subnet 10.0.0.0 netmask 255.255.255.0 {
  option subnet-mask 255.255.255.0;
  option broadcast-address 10.0.0.255;
  option routers 10.0.0.1;
  range 10.0.0.2 10.0.0.254;
}

Should work after adjustment for your domain and network. You'll want to use 'dhcpd eth0' to restrict the daemon to your inside NIC.
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Author Comment

by:theaussie
ID: 12160070
jlevie - Can you explain what you mean by 'use dhcpd eth0'.

 I have my settings in rc.inet.conf for eth0 as:
# Config information for eth0:
IPADDR[0]="10.0.0.2"
NETMASK[0]=""
USE_DHCP[0]=""
DHCP_HOSTNAME[0]="slackbox"
# Config information for eth1:
IPADDR[1]=""
NETMASK[1]=""
USE_DHCP[1]="yes"
DHCP_HOSTNAME[1]=""

My dhcpd.conf
 # Global options
option domain-name "slackbox";
option domain-name-servers 10.0.0.1;
                                                                               
authoritative;
ddns-update-style none;
                                                                               
subnet 10.0.0.0 netmask 255.255.255.0 {
  option subnet-mask 255.255.255.0;
  option broadcast-address 10.0.0.255;
  option routers 10.0.0.1;
  range 10.0.0.2 10.0.0.254;
}
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Accepted Solution

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jlevie earned 125 total points
ID: 12160658
Since your system has eth0 configured for 10.0.0.2 you'll need to use:

subnet 10.0.0.0 netmask 255.255.255.0 {
  option subnet-mask 255.255.255.0;
  option broadcast-address 10.0.0.255;
  option routers 10.0.0.2;
  range 10.0.0.3 10.0.0.254;
}

Also note that  "option domain-name "slackbox";" doesn't specify a valid domain. A domain name must contain at least one '.'. If you don't have a registered domain you could use "option domain-name "slacklocal.org";".

And you'll need to adust the IP specified in "option domain-name-servers". If you are running a DNS server on the Linux box you'd use eth0's IP. Otherwise you'll want to specify the IP of your ISP's name server.

> Can you explain what you mean by 'use dhcpd eth0'.

dhcpd is a daemon, which means that it runs all the time. Someplace during the boot process there has to be a command to start dhcpd and by making sure that the command line that does this uses 'dhcpd eth0' the daemon will only bind to the eth0 interface and thus only offer DHCP to the local network.
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Expert Comment

by:uptimecustomercare
ID: 12258753
All linux system have a sample configuration file for dhcp.Try to locate the file using "find "
or "locate" command."locate" command is faster.

locate  dhcpd.co*

or

find / -name dhcpd.co*  -print


rename or copy  the sample file to  dhcpd.conf and move it to /etc/dhcp or /etc/dhcpd . Edit the file to suit your lan requirements.

restart the dhcpd service.

This is simple and should work.
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