Hi, I have implemented this scenario wherein the DHCP server is 3 router's away or 3 hops away from the access layer switches. I have connected two cisco routers on the access switches that emulates PC1 and Rogue DHCP server in that order.
I have shutdown the ports on the true DHCP server.
The SVI on the access switch is configured with ip helper-address [ip address of DHCP server].
I have enabled debug dhcp detail on the 2 cisco routers(PCI and Rogue DHCP server). It seems that the PC1 can't see the Rogue DHCP server. Might this be an IOU software bug? I have reloaded my VMware number of tmes and started it back up but still the PC can't get an IP on the Rogue DHCP server. I have not yet enabled spoofing so the Rogue DHCP server should get it....
debug on client: MKTG1#!!!!!! *Mar 1 00:31:03.091: DHCP: SDiscover attempt # 2 for entry: *Mar 1 00:31:03.095: Temp IP addr: 0.0.0.0 for peer on Interface: Ethernet0 *Mar 1 00:31:03.095: Temp sub net mask: 0.0.0.0 *Mar 1 00:31:03.095: DHCP Lease server: 0.0.0.0, state: 1 Selecting *Mar 1 00:31:03.095: DHCP transaction id: 710 *Mar 1 00:31:03.095: Lease: 0 secs, Renewal: 0 secs, Rebind: 0 secs *Mar 1 00:31:03.095: Next timer fires after: 00:00:04 *Mar 1 00:31:03.095: Retry count: 2 Client-ID: cisco-d00c.1c4b.0001-Et0 *Mar 1 00:31:03.095: Client-ID hex dump: 636973636F2D643030632E316334622E *Mar 1 00:31:03.095: 303030312D457430
debug on Rogue DHCP server: ROGUEDHCP#!! *Mar 1 00:31:08.155: DHCPD: DHCPDISCOVER received from client 0063.6973.636f.2d64.3030.632e.3163.3462.2e30.3030.312d.4574.30 on interface Ethernet0.
Here is the topology I made...
http://imgur.com/a/Zssks
