I have and am currently using this setup on many models of Cisco gear.
!
ip dhcp pool WAP-MGT
network 10.59.123.0 255.255.255.0
default-router 10.59.123.1
option 43 ascii "10.55.122.205"
!
Cisco Routers
1800
2800
3800
6500
7200
...
Try it this way and see how it works.
!
ip dhcp pool alfa
network 192.168.2.0 255.255.255.0
default-router 192.168.2.1
dns-server 192.168.2.1
option 43 ascii x.x.x.x
!
