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Configuring Authenticated VLANs Setting Up Authentication Clients
OmniSwitch 6600 Family Network Configuration Guide April 2006 page 21-23
Configuring the AV-Client for DHCP
For an AV-Client, DHCP configuration is not required. AV-Clients do not require an IP address to authen-
ticate, but they may want an IP address for IP communication in an authenticated VLAN.
Note. If the AV-Client will be used with DHCP, the DHCP server must be configured as described in
“Setting Up the DHCP Server” on page 21-29.
At startup, an AV-Client user PC workstation will issue a Windows DHCP request if the AV-Client’s
DHCP release/renew feature is enabled. This feature is disabled by default. The AV-Client is capable of
obtaining an address from the default client VLAN or whatever VLAN it authenticates into if a DHCP
server is located in the VLAN.
The DHCP tab of the configuration utility gives you several options for managing DHCP when it is
enabled. You also have the option of disabling DHCP operations.
Delay for IP Address Request
• You can specify a delay between the moment the client workstation moves into an authentication
VLAN and the moment a DHCP request is issued for an IP address.
• You can specify a delay between the moment the client workstation moves into the default VLAN and
the moment a DHCP request is issued for an IP address.
Releasing the IP Address
• You can specify a delay between the moment the client workstation logs off the network and the
DHCP releases the IP address assigned to the client.
• You can configure the utility so that DHCP releases the IP address before the client workstation leaves
the default VLAN.
Note. A delay between DHCP release and client logoff is recommended because the DHCP server’s MAC
address may be timed out in the AV-Client’s ARP table. If that is the case, the client must send an ARP
packet to discover the DHCP server’s MAC address before it can send the release packet. If the logoff
packet is sent to the switch before the release packet gets sent, then the IP address will never be released.
Increasing the value of the delay parameter can prevent this from happening.