ZyXEL Communications Centralized Network Management Vantage CNM - Manual (Page 375)

Vantage CNM User’s Guide
375
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P P E N D I X
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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.
Case A: The device is using the same LAN and WAN IP
addresses
The following figure shows an example where the device is using a WAN IP address that is the
same as the IP address of a computer on the LAN.
Figure 226 IP Address Conflicts: Case A
You must set the device to use different LAN and WAN IP addresses on different subnets if
you enable DHCP server on the device. 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 device use
a public WAN IP address.
Case B: The Device LAN IP address conflicts with the DHCP
client IP address
In the following figure, the device is acting as a DHCP server. The device assigns an IP
address, which is the same as its LAN port IP address, to a DHCP client attached to the LAN.