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VSG-1200 V2 User’s Guide

Appendix B IP Address Assignment Conflicts 236

Appendix B

IP Address Assignment Conflicts

This appendix describes situations where IP address conflicts may occur. Subscribers with

duplicate IP addresses will not be able to access the Internet.

Scenario 1: The VSG is using the same LAN and WAN IP

addresses

The following figure shows an example where the VSG is using a WAN IP address that is the

same as the IP address of a computer on the LAN.

Figure 178 IP Address Conflicts: Scenario 1

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 2: The VSG LAN IP address conflicts with the DHCP

client IP address

In the following figure, the VSG is acting as a DHCP server. The VSG assigns an IP address,

which is the same as its LAN port IP address, to a DHCP client attached to the LAN.

Figure 179 IP Address Conflicts: Scenario 2

To solve this problem, make sure the VSG LAN IP address is not in the DHCP IP address

pool.

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ZyXEL VSG-1200 User Manual Page 236