[TriLUG] Setting up a DHCP server

[Joseph Mack NA3T]

On Sun, 2 Nov 2008, Dwayne Arruza wrote:

> For example, "option routers" - what router? I have a 
> Linksys WRT54GS performing the routing function. Is that 
> the IP I need to use for this option?

yes

>        option routers 192.168.1.?;

whatever machine you would have as your default gw if you'd 
assigned the IPs by hand

most likely 192.168.1.1 or 192.168.1.254

The first address is the usual router address. The second 
address as the router allows you to establish a sensible 
network which survives testing a commodity router in its 
standard configuration on the same network. These commodity 
devices come with IP=192.168.1.1 and will hose your routing.

>        option broadcast-address 192.168.1.?;

the broadcast address you would have used if you assigned 
the IP by hand.

Almost certainly 192.168.1.255

>        option subnet-mask 255.255.255.0;
>
>        option domain-name-servers 192.168.1.?;

will be the address(es) given to you by your ISP. If you 
have a local name server (may as well if you're going to 
setup dhcpd), it will be the IP of your name server which 
will most likely be your router. Your nameserver will use 
the ISP's name servers as the "forwarder" entry. Your local 
name server will have entries for all the local machines and 
will forward all other request to the ISP's name server.

Joe

--
jmack (at) wm7d (dot) net - azimuthal equidistant map
generator at http://www.wm7d.net/azproj.shtml
Homepage http://www.austintek.com/ It's GNU/Linux!