Figure 160 Ip Address Conflicts: Scenario 3 - ZyXEL Communications VSG-1200 User Manual

VSG-1200 User's Guide
Scenario 3: The Subscriber IP address is the same as the IP
address of a network device
The following figure depicts an example where the subscriber IP address is the same as the IP address
of a network device not attached to the VSG.

Figure 160 IP Address Conflicts: Scenario 3

You must set the VSG to use different LAN and WAN IP addresses on different subnets if you
enable DHCP server on the VSG. For example, you set the WAN IP address to 192.59.1.1 and
the LAN IP address to 10.59.1.1.
Otherwise, It is recommended the VSG use a public WAN IP address.
Scenario 4: Two or more subscribers have the same IP
address.
By converting all private IP addresses to the WAN IP address, the VSG allows subscribers
with different network configurations to access the Internet. However, there are situations
where two or more subscribers are using the same private IP address. This may happen when a
subscriber is configured to use a static (or fixed) IP address that is the same as the IP address
the VSG DHCP server assigns to another subscriber acting as a DHCP client.
In this case, the subscribers are not able to access the Internet.
218 Appendix B IP Address Assignment Conflicts