ZyXEL Communications 43222612 User Manual page 87

Figure 64 Tutorial: Set the DHCP Server Port to Trusted
Go to Advanced Application > IP Source Guard > IPv4 Source Guard Setup > DHCP Snooping >
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Configure > VLAN, show VLAN 100 by entering 100 in the Start VID and End VID fields and click Apply.
Then select Yes in the Enabled field of the VLAN 100 entry shown at the bottom section of the screen.
If you want to add more information in the DHCP request packets such as source VLAN ID or system
name, you can also select an Option82 Profile in the entry.
Figure 65 Tutorial: Enable DHCP Snooping on this VLAN
Click Save at the top right corner of the Web Configurator to save the configuration permanently.
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Connect your DHCP server to port 4 and a computer (as DHCP client) to either port 5 or 6. The computer
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should be able to get an IP address from the DHCP server. If you put the DHCP server on port 5 or 6, the
computer will NOT be able to get an IP address.
10 To check if DHCP snooping works, go to Advanced Application > IP Source Guard > IPv4 Source Guard
Setup, you should see an IP assignment with the type DHCP-Snooping as shown.
Chapter 6 Tutorials
GS2220 Series User's Guide
87