Option 82 or subnet: who wins?

[Austin Gabel]

Class declarations are global. Take it out of the subnet declaration.  If
these two subnets are on the same vlan they should be in a 'shared-network'
declaration. The class should also be outside of this shared network. Then
put a deny members of "ms_rm116_sw2650_hp1.0.17"; option in the 192.168.50.0
network.



On Fri, Mar 13, 2009 at 11:56 AM, David McGaughey <mcgoy1 at clearwire.net>wrote:

>  Greetings list!  And my apology if I’ve missed this somewhere in my
> googling.  I’ve a situation where I have an option 82 definition for a port
> on a switch and a separate subnet definition. If I plug my client into the
> switch port which has the class definition for a subnet AND I plug my dhcp
> server into the switch port next to my client – same vlan – then I get a
> mixture of the leases from both subnet definitions.  It would be nice to get
> one or the other, and not a mixture of both.  Here’s the config file:
>
>
>
> option domain-name "ci.lubbock.tx.us";
>
> option domain-name-servers 10.2.1.254, 10.2.1.253, 10.2.1.7;
>
> default-lease-time 259200;
>
> max-lease-time 259200;
>
> ddns-update-style none; ddns-updates off;
>
> authoritative;
>
> subnet 172.25.254.0 netmask 255.255.255.0 {
>
>   option subnet-mask 255.255.255.0;
>
>   option broadcast-address 172.25.254.255;
>
>   option routers 172.25.254.1;
>
> class "ms_rm116_sw2650_hp1.0.17"
>
> {
>
>  match if (
>
>          option agent.remote-id = 0:1d:b3:1f:c2:80
>
>      and
>
>          option agent.circuit-id = 0:11
>
>       );
>
> }
>
> pool {
>
>  range 172.25.254.47 172.25.254.49;
>
>  allow members of "ms_rm116_sw2650_hp1.0.17";
>
> }
>
> }
>
> subnet 192.168.50.0 netmask 255.255.254.0 {
>
>  pool {
>
>    option broadcast-address 192.168.51.255;
>
>    option routers 192.168.50.1;
>
>    option subnet-mask 255.255.254.0;
>
>    default-lease-time 14400;
>
>    max-lease-time 14400;
>
>    range 192.168.51.1 192.168.51.254;
>
>   }
>
> }
>
>
>
> Here’s what the client (ipconfig /all) got:
>
>
>
>
>
>  Windows IP Configuration
>
>
>
>         Host Name . . . . . . . . . . . . : WXPITIMAGE03c
>
>         Primary Dns Suffix  . . . . . . . :
>
>         Node Type . . . . . . . . . . . . : Unknown
>
>         IP Routing Enabled. . . . . . . . : No
>
>         WINS Proxy Enabled. . . . . . . . : No
>
>         DNS Suffix Search List. . . . . . : ci.lubbock.tx.us
>
>
>
> Ethernet adapter Local Area Connection 2:
>
>
>
>         Connection-specific DNS Suffix  . : ci.lubbock.tx.us
>
>         Description . . . . . . . . . . . : VMware Accelerated AMD PCNet
> Adapter
>
>         Physical Address. . . . . . . . . : 00-50-56-0F-0F-12
>
>         Dhcp Enabled. . . . . . . . . . . : Yes
>
>         Autoconfiguration Enabled . . . . : Yes
>
>         IP Address. . . . . . . . . . . . : 192.168.51.4
>
>         Subnet Mask . . . . . . . . . . . : 255.255.255.0
>
>         Default Gateway . . . . . . . . . : 172.25.254.1
>
>         DHCP Server . . . . . . . . . . . : 192.168.50.2
>
>         DNS Servers . . . . . . . . . . . : 10.2.1.254
>
>                                             10.2.1.253
>
>                                             10.2.1.7
>
>         Lease Obtained. . . . . . . . . . : Friday, March 13, 2009 11:43:21
> AM
>
>         Lease Expires . . . . . . . . . . : Friday, March 13, 2009 3:43:21
> PM
>
>
>
> Note that the IP Address comes from the second subnet, which happens to be
> that of the DHCP server, but the netmask and the router come from the FIRST
> subnet definition.
>
>
>
> Neither subnet is winning now.  Should one of them be the “winner” and
> assign all its information to the client?
>
>
>
> David McGaughey <http://mcgoy.plumbearcat.com/>
>
> Lubbock, Texas
>
> mcgoy at plumbearcat.com
>
> (806)438-7363
>
>
>
>
>
> _______________________________________________
> dhcp-users mailing list
> dhcp-users at lists.isc.org
> https://lists.isc.org/mailman/listinfo/dhcp-users
>
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