Client in two subnets. In one it should get an fixed address.

[Marc Muehlfeld]

Hello.

I have two client subnets served by one DHCP server out of a third (server) 
subnet. The requests are send to the server via a DHCP-relay on the router, 
between the subnet.

How can I configure a fixed address for one host if it is connected in the 
first subnet and when it is connected to the second, it get one out of the pool?

Currently when I connect PC-02 to the first subnet, it gets an IP out of the 
10.1.0.241 10.1.0.254 range instead out of 10.1.0.100 10.1.0.200. In the 
second subnet it gets the configured fixed address, like wanted.

Regards
Marc





subnet 10.1.0.0 netmask 255.255.255.0 {

  option broadcast-address 10.1.0.255;
  option routers 10.1.0.5;

  # Hosts with fix IPs via DHCP
  pool {
   range 10.1.0.241 10.1.0.254;
   deny unknown-clients;
   host PC-01 { hardware ethernet AA:AA:AA:AA:AA:AA; fixed-address 10.1.0.254;}
  }

  # Printer with fix IPs via DHCP
  pool {
   range 10.1.0.17 10.1.0.31;
   deny unknown-clients;
   host PRT-1 { hardware ethernet 11:11:11:11:11:11; fixed-address 10.1.0.18;}
  }

  # All other DHCP clients
  pool {
   range 10.1.0.100 10.1.0.200;
   allow unknown-clients;
  }

}



subnet 10.1.1.0 netmask 255.255.255.0 {

  option broadcast-address 10.1.1.255;
  option routers 10.1.1.5;

  # Hosts with fix IPs via DHCP
  pool {
   range 10.1.1.241 10.1.1.254;
   deny unknown-clients;
   host PC-02 { hardware ethernet BB:BB:BB:BB:BB:BB; fixed-address 10.1.1.254;}
  }

  # Printer with fix IPs via DHCP
  pool {
   range 10.1.1.17 10.1.1.31;
   deny unknown-clients;
   host PRT-2 { hardware ethernet 22:22:22:22:22:22; fixed-address 10.1.1.18;}
  }

  # All other DHCP clients
  pool {
   range 10.1.1.100 10.1.1.200;
   allow unknown-clients;
  }

}