I’m working on a project where I need my DHCP server to send an IP address from a specific DHCP range if the hostname is a certain value otherwise it needs to send a normal IP address range.<\/p>\n
I’m using Internet Systems Consortium DHCP Server V3.0.3 (ISC-DHCP).<\/p>\n
To give a specific address range, we first need to detect if the DHCP client is sending the option 12 host-name and if so assign it to a class.<\/p>\n
class “FooBar” { match if (option host-name = “foobar”); }<\/p><\/blockquote>\n
Once the client has a class associated to it we need to give it an address from a pool that doesn’t deny it.<\/p>\n
subnet 192.168.0.0 netmask 255.255.255.0 {<\/p><\/blockquote>\n
Other DHCP settings here but make sure that the range is not<\/strong> specified; it overrides the pool settings.<\/p>\n
pool {
\nallow members of “FooBar”;
\nrange 192.168.0.90 192.168.0.99;
\n}<\/p><\/blockquote>\nOtherwise we want the systems that don’t specify a hostname to get an address from the normal IP address pool<\/p>\n
pool {
\nrange 192.168.0.254 192.168.0.100;
\n}<\/p><\/blockquote>\nAdd more pools if needed<\/p>\n
} # ending the subnet declaration<\/p><\/blockquote>\n
Pretty simple, hu?<\/p>\n
UPDATE:<\/p>\n
Thanks to a post I read by Bill Stephens of the PepsiCo Business Solutions Group, you can match a hostname using substr.\u00a0 If your DHCP clients are named foobar-xyz you can use substr to match for foobar:<\/p>\n
class “FooBar” {<\/p>\n
match if ( substring(option host-name,0,6) = “foobar”);<\/p>\n
}<\/p><\/blockquote>\n
(This would match the first 6 characters of the option 12 host-name)<\/p>\n","protected":false},"excerpt":{"rendered":"
I’m working on a project where I need my DHCP server to send an IP address from a specific DHCP range if the hostname is a certain value otherwise it needs to send a normal IP address range.<\/p>\n
I’m using Internet Systems Consortium DHCP Server V3.0.3 (ISC-DHCP).<\/p>\n
To give a specific address range, we first need to detect if the DHCP client is sending the option 12 host-name and if so assign it to a class.<\/p>\n
class “FooBar” { match if (option host-name = “foobar”); }<\/p>\n
Once the client has a class associated to it we need to give it an address from a pool that doesn’t deny it.<\/p>\n