We offer Internet access using a cisco 3845 which we configure NAT/DHCP, we have the following issues:
1. We sometime get IP conflict on the private side of the interface, we believe some customers using Linksys router must have set IP address on the WAN port of their Linksys router.
2. We also noticed some customers see other computers belonging to other customers in their Windows network setup.
How do I mitigate against these?
My Config:
ip dhcp excluded-address 172.20.255.0 172.20.255.254
!
ip dhcp pool CTBusiness3
network 172.20.0.0 255.255.0.0
default-router 172.20.0.1
dns-server 80.255.35.180 198.6.1.1
!
!
interface FastEthernet0/0
description $FW_OUTSIDE$
ip address 198.X.X.X 255.255.255.192
no ip directed-broadcast
ip nbar protocol-discovery
ip nat outside
ip virtual-reassembly
duplex full
speed 100
!
interface FastEthernet0/1
description Connect to WuseII6506 fa3/34 (VLAN 34 access port)$FW_INSIDE$
ip address 172.20.0.1 255.255.0.0
no ip directed-broadcast
ip nbar protocol-discovery
ip nat inside
ip virtual-reassembly
duplex full
speed 100
!
ip classless
ip route 0.0.0.0 0.0.0.0 XXXXXXXXX
