Hello,
here is a sample config which will work on both routers. You don't need a special IOS, IP Only will work for DHCP:
ip dhcp excluded-address 10.27.0.1 10.27.0.255
ip dhcp excluded-address 10.27.1.0 10.27.1.99
ip dhcp excluded-address 10.27.1.151 10.27.1.255
ip dhcp excluded-address 10.27.2.1 10.27.255.254
ip dhcp excluded-address 10.27.255.255
!
ip dhcp pool MyCompany
network 10.27.0.0 255.255.0.0
domain-name mydomain
netbios-name-server 10.0.2.1
netbios-node-type h-node
default-router 10.27.6.1
dns-server 10.0.2.60
Here is a link to a document that describes in detail the options you have when you want to configure a Cisco router (including the 1760 and the 3640) as a DHCP server:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1830/products_feature_guide09186a008008743b.html
Regards,
GP
