Re: dhcp config

[Tim <ignored_mailbox@xxxxxxxxxxxx>]

On Mon, 2006-02-20 at 16:21 -0600, Steven J Lamb wrote:
> I am trying to configure dhcpd3 to allocate two pools of addresses based on 
> the requesting router's ip. I have a Cisco router with two interfaces that I 
> would like to give different ip blocks to each group depending on what 
> interface they are connected on. I have things set up so that my log files 
> say connecting via 192.168.0.254 or connecting via 192.168.1.254 depending 
> on the router the dhcp request comes from. however it hands all of the ip's 
> out of the same pool. I could do this with two different servers but I don't 
> want to set up a new instance of dhcp. any suggestions.

It'd help if you posted your dhcpd.conf file.  But I've done something
similar, you need to play with subnet options in it.  You could see what
I've done in mine (below) as an example (NB: it's full of experiments,
you don't need most of what's there).

cat /etc/dhcpd.conf

# common parts:
authoritative;
allow                   client-updates;
include                 "/etc/rndc.key";  # (same key used by BIND, needed to update DNS records)

ddns-domainname         "example.com.";
ddns-rev-domainname     "in-addr.arpa.";
ddns-update-style       interim;
ddns-updates            on;

default-lease-time      21600;  # 2 hours
max-lease-time          43200;  # 24 hours
min-lease-time          30;     # 30 seconds (might allow renewing experiments)

option domain-name      "example.com.";

option nntp-server      news.example.com;
option pop-server       pop3.example.com;
option smtp-server      smtp.example.com;
option wpad-curl        code 252 = text;
#option wpad-curl       "http://proxy.example.com/wpad.dat";;
option www-server       example.com;

option ntp-servers      time.example.com;
option time-offset      34200;  # Australian Central Standard Time
#option time-offset     37800;  # Central Australia Daylight Time

# Seem to be stupidly stuck with manually setting this!
# Daylight savings:  2am last Sun of Oct - 3am first Sun of Apr

option ip-forwarding    off;    # tell clients not to act as gateways (?)

shared-network example.com {

        option wpad-curl        "http://proxy.example.com/wpad.dat";;

        subnet 192.168.1.0 netmask 255.255.255.0 {

                range 192.168.1.100 192.168.1.200;

                option routers                  192.168.1.2;  # default gateway
                option subnet-mask              255.255.255.0;
                option broadcast-address        192.168.1.255;
                option domain-name-servers      192.168.1.2;

                option netbios-dd-server        192.168.1.2;
                option netbios-name-servers     192.168.1.2;  # WINS
                option netbios-node-type 8;
                option netbios-scope "";

                option finger-server            finger.example.com;

                zone  1.168.192.in-addr.arpa. {
                        primary 192.168.1.2;
                        key rndckey;
                }

                zone example.com. {
                        primary 192.168.1.2;
                        key rndckey;
                }

                # we want the nameserver to appear at a fixed address
                # (Any terminal saying it's ns.example.com will be
                # assigned this IP.)

                host ns {
                        #next-server ns.example.com;
                        fixed-address 192.168.1.2;
                }

                host fixed {
                        fixed-address 192.168.1.99;
                }

                host fixme {
                        fixed-address 192.168.1.150;
                }

                #host flakey {
                #       hardware ethernet 00:00:21:25:92:fb;
                #       fixed-address 192.168.1.180;
                #       option host-name "deadmeat";
                #       update-static-leases on;
                #}

#               host rover {
#                       hardware ethernet 00:48:54:8e:8c:0c;
#                       fixed-address 192.168.1.18;
#               #       set ddns-rev-name = "101.1.168.192.in-addr.arpa.";
#                       fixed-address rover.example.com;
#                       option host-name "rover";
#               }
        }




        subnet 192.168.2.0 netmask 255.255.255.0 {

                range 192.168.2.100 192.168.2.200;

                option routers                  192.168.2.2;  # default gateway
                option subnet-mask              255.255.255.0;
                option broadcast-address        192.168.2.255;
                option domain-name-servers      192.168.2.2;

                option netbios-dd-server        192.168.2.2;
                option netbios-name-servers     192.168.2.2;  # WINS
                option netbios-node-type 8;
                option netbios-scope "";

                option finger-server            finger.example.com;

                zone  1.168.192.in-addr.arpa. {
                        primary 192.168.2.2;
                        key rndckey;
                }

                zone example.com. {
                        primary 192.168.2.2;
                        key rndckey;
                }


                host ns {
                        #next-server ns.example.com;
                        fixed-address 192.168.2.2;
                }

                host fixed {
                        fixed-address 192.168.2.99;
                }


        }

}

# ------------------ end of it all ---------------------------------------

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