Serving nonstandard dhcp values

pcatiprodotnet · May 19, 2006, 4:37 AM

Although my interface IP/Netmask may be large, such as 10.0.0.0/8 … I want to DHCP to serve a more constrained range and netmask on this interface, such as 10.130.1.0/24 ... is this possible? If so, how would I set it up?
Thanks, -pc

sullrich · May 19, 2006, 3:05 PM

No, this is not currently possible.

pcatiprodotnet · May 19, 2006, 5:18 PM

Since the dhcp server is simply transmitting data fields (ip,netmask,gateway,dns,etc) out to clients. If the dhcpd server developers took it upon themselves to unnecessary code in non-required restrictions as to the content of the data (ie. netmask), well that just seems daft. If this is actually the case, I imagine that silly netmask validation routine could easily be commented out of dhcpd source.

sullrich · May 19, 2006, 5:17 PM

@pcatiprodotnet:

Since the dhcp server is simply transmitting data fields (ip,netmask,gateway,dns,etc) out to clients. If the dhcpd server developers took it upon themselves to unnecessary code in non-required restrictions as to the content of the data (ie. netmask), well that's just seems daft. If this is actually the case, I imagine that silly netmask validation routine could easily be commented out of dhcpd source.

Its possible but pfSense does not support it.

pcatiprodotnet · May 19, 2006, 9:43 PM

To verify, if my Interface IP/Netmask is "10.130.1.1/13" then the following dhcpd.conf entry for that interface would not work?

subnet 10.130.1.0 netmask 255.255.255.0 {
range 10.130.1.10 10.130.1.254;
option subnet-mask 255.255.255.0;
option broadcast-address 10.130.1.255;
option routers 10.130.1.1;
option domain-name-servers 10.130.1.1;
option domain-name "domain.com";
option ip-forwarding on;
option netbios-node-type 8;
}

jeroen234 · May 19, 2006, 5:53 PM

subnet on the client interface and the server interface need to be the same

pcatiprodotnet · May 19, 2006, 6:18 PM

Ah, corrected a typo, the interface IP is now specified as desired above.