Option 82 or subnet: who wins?
David McGaughey
mcgoy1 at clearwire.net
Fri Mar 13 16:56:38 UTC 2009
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
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