Cisco CCNP and CCIE Study Notes

A Cisco IOS router has been configured to act as a DHCP relay bewteen a DHCP client and a DHCP server. Assume that the server and client are configured properly. Given the following configuration on the DHCP relay router, can you determine why the client is unable to obtain an IP address from the DHCP server?

DHCP-RELAY#sh runn
Building configuration...

Current configuration : 660 bytes
!
hostname DHCP-RELAY
!
interface Ethernet0
 ip address 20.1.1.1 255.255.255.0
 ip access-group 101 in
 ip helper-address 10.1.1.254
 no keepalive
!
interface Ethernet1
 ip address 10.1.1.1 255.255.255.0
 no keepalive
!
access-list 101 deny   udp any any
!
end

DHCP-RELAY#