Using Option 82

[Warner, Bill]

Here is a snip-it of my dhcpd.conf file  from the switch, the network admin sets the option agent.circuit-id to the hostname that the hardware should receive.  Everything else is handled by PXEBoot and DHCPd.

I'm posting this because I wasn't able to find any really good examples, and I was looking for some possible comments on if it is the best way to handle this:

#
# DHCP Server Configuration file.
#   see /usr/share/doc/dhcp*/dhcpd.conf.sample
#
ddns-update-style none;

option space pxelinux;
option pxelinux.magic      code 208 = string;
option pxelinux.configfile code 209 = text;
option pxelinux.pathprefix code 210 = text;
option pxelinux.reboottime code 211 = unsigned integer 32;

# Needed for dhcp 3.0.5
next-server x.x.x.18; # TFTP Server

# VLAN 1 is for VMs
# VLAN 2
class "static-x.x.x.36" { match if option agent.circuit-id="hostname1:switch2"; }
class "static-x.x.x.37" { match if option agent.circuit-id="hostname2:switch2"; }
class "static-x.x.x.38" { match if option agent.circuit-id="hostname3:switch2"; }
class "static-x.x.x.39" { match if option agent.circuit-id="HOSTNAME:switch2"; }
class "static-x.x.x.40" { match if option agent.circuit-id="HOSTNAME:switch2"; }
class "static-x.x.x.41" { match if option agent.circuit-id="HOSTNAME:switch2"; }
class "static-x.x.x.42" { match if option agent.circuit-id="HOSTNAME:switch2"; }
class "static-x.x.x.43" { match if option agent.circuit-id="HOSTNAME:switch2"; }
class "static-x.x.x.44" { match if option agent.circuit-id="HOSTNAME:switch2"; }
class "static-x.x.x.45" { match if option agent.circuit-id="HOSTNAME:switch2"; }
class "static-x.x.x.46" { match if option agent.circuit-id="HOSTNAME:switch2"; }
class "static-x.x.x.47" { match if option agent.circuit-id="HOSTNAME:switch2"; }
class "static-x.x.x.48" { match if option agent.circuit-id="HOSTNAME:switch2"; }
class "static-x.x.x.49" { match if option agent.circuit-id="HOSTNAME:switch2"; }

shared-network eth0 {
        not authoritative;
        use-host-decl-names true;

        site-option-space "pxelinux";
        option pxelinux.magic f1:00:74:7e;
        option pxelinux.reboottime 10;

        if exists dhcp-parameter-request-list {
                option dhcp-parameter-request-list = concat(option dhcp-parameter-request-list,d0,d1,d2,d3);
        }

        option host-name = substring(option agent.circuit-id, 0, 9);

        log (info, "client requested");
        log (info, concat("raw circuit-id = ", option agent.circuit-id));
        log (info, concat("parsed circuit-id = ", substring(option agent.circuit-id, 0, 9)));

        subnet x.x.x.0 netmask 255.255.255.224 {
                option domain-name "example.com";
                option subnet-mask      255.255.255.224;
                option routers    x.x.x.1;
                option domain-name-servers x.x.y.12, x.x.y.11;
                filename "images/base/boot/pxelinux.0";

                option root-path "x.x.x.18:/tftpboot/images/base";
                option pxelinux.configfile "pxelinux.cfg";
                option pxelinux.pathprefix "/images/base/boot/";
        }

        pool { range x.x.x.36; allow members of "static-x.x.x.36"; }
        pool { range x.x.x.37; allow members of "static-x.x.x.37"; }
        pool { range x.x.x.38; allow members of "static-x.x.x.38"; }
        pool { range x.x.x.39; allow members of "static-x.x.x.39"; }
        pool { range x.x.x.40; allow members of "static-x.x.x.40"; }
        pool { range x.x.x.41; allow members of "static-x.x.x.41"; }
        pool { range x.x.x.42; allow members of "static-x.x.x.42"; }
        pool { range x.x.x.43; allow members of "static-x.x.x.43"; }
        pool { range x.x.x.44; allow members of "static-x.x.x.44"; }
        pool { range x.x.x.45; allow members of "static-x.x.x.45"; }
        pool { range x.x.x.46; allow members of "static-x.x.x.46"; }
        pool { range x.x.x.47; allow members of "static-x.x.x.47"; }
        pool { range x.x.x.48; allow members of "static-x.x.x.48"; }
        pool { range x.x.x.49; allow members of "static-x.x.x.49"; }
} #end eth0

--
Bill Warner
Linux/Unix/VMWare/Storage Systems Administrator
Early Warning Services, LLC
Tel:  480-656-6901
Mob: 602-908-0784
Fax:  480-656-5001
Email: bill.warner at early-warning.com<mailto:bill.warner at early-warning.com>

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