ZyXEL Communications GS1910 series User Manual page 43

Go to Configuration > Security > Network > DHCP > Snooping to activate DHCP snooping on
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the Switch.
Specify whether ports are trusted or untrusted ports for DHCP snooping. Select Trusted in the
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Mode field for port 5 because the DHCP server is connected to port 5. Set ports 6 and 7 to
Untrusted as they are connected to DHCP clients. Click Save.
Connect your DHCP server to port 5 and a computer (as DHCP client) to either port 6 or 7. The
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computer should be able to get an IP address from the DHCP server. If you put the DHCP server on
port 6 or 7, the computer will not able to get an IP address.
Click Configuration > Security > Network > IP Source Guard > Configuration and enable IP
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source guard on the Switch and on ports 6 and 7. Set the maximum number of DHCP clients to
learn dynamically on ports 6 and 7. Click Save.
Chapter 5 Tutorials
GS1910/XGS1910 Series User's Guide
43