How to define Relay Agent Vendor Specific suboption in ISC dhcpd.conf

[Shu Lin]

Hi, 
I am trying to configure dhcpd.conf to support the DHCP request coming
from a WiMAX ASN-GW. According to RFC4243 and WiMAX Forum NWG document.
I need put some configuration supporting Relay Agent Vendor Specific
WiMAX suboption
I went through all the man pages and Internet. I can only find the way
to use "Vendor Encapsulated Options" to specify vendor specific options.
But, even with that solution, it is still vendor specific option in the
option level. What I exactly need actually is the vendor specific
suboption definition inside relay agent option which defined by RFC4243.
All the examples I can find from man page and internet don't come to
that level of detail.
Another problem I have is how to define the correct pool to catch
self-defined class. I followed the man page of dhcpd.conf,
dhcpd-options, dhcpd-eval coming with below definition:
option space WIMAX;
option WIMAX.mip4_registration code 1 = unsigned integer 8;
option WIMAX.HA_IP code 2 = ip-address;
class "vendor-classes"
{
        match option vendor-class-identifier;
}
subclass "vendor-classes" "wimax-ha-192.168.205.1"
{
        vendor-option-space WIMAX;
        option WIMAX.HA_IP 192.168.205.1;
}
subclass "vendor-classes" "wimax-ha-192.168.206.1"
{
        vendor-option-space WIMAX;
        option WIMAX.HA_IP 192.168.206.1;
}
But, I will get error when I try to use the class or subclass in the
pool like below:
shared-network ASN-67
{
        server-name                     "asnc_67";
        option domain-name-servers      192.168.200.5, 192.168.200.4;
        option time-offset              -28800;         # GMT-8
        default-lease-time 21600;       # 6 hours
        max-lease-time 86400;           # 24 hours
        subnet 10.67.0.0 netmask 255.255.0.0
        {
                pool
                {
                        allow members of "vendor-classes"
"wimax-ha-192.168.205.1";
                        range dynamic-bootp    10.67.128.1
10.67.255.253;
                }
               option subnet-mask              255.255.0.0;
               option routers                  10.67.0.1;      # gateway
        }
}
Or another error if I define the pool like below:
                pool
                {
                        allow members of "wimax-ha-192.168.205.1";
                        range dynamic-bootp    10.67.128.1
10.67.255.253;
                }
My question is the explanation of subclass in dhcpd.conf man page
confused me with the "Vendor Encapsulated Options" sample in
dhcpd-options man page. How can I use the subclass correctly to match
the wimax vendor specific option in the pool definition.
Thanks,
-Shu




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