C
LIENT
S
ECURITY
C
OMMANDS
23-8
• This switch provides a total of 7 masks for filtering functions,
including IP-MAC address packet filtering, NetBIOS packet filtering,
DHCP packet filtering, and ACLs. Three masks are allocated to
NetBIOS packet filtering if enabled on any interface. These masks will
be released for use by other filtering functions if NetBIOS packet
filtering is disabled on all interfaces.
Example
filter dhcp-request
This command filters DHCP request packets.
Syntax
filter dhcp-request {add | del} interface
•add - Enables DHCP request filtering.
•del - Disables DHCP request filtering.
•interface
-unit - Stack unit. (Range: 1)
-port-list - Single port number or list of ports. (Range: 1-18)
Default Setting
Disabled
Command Mode
Global Configuration
Command Usage
• In cases where the IP address for a client attached to a downlink port
is fixed (i.e., at the VDSL port on the CPE), you should use this
command to block any DHCP requests from the client.
• To specify a port list, use a hyphen to indicate a range of p orts, or a
comma to indicate a group of non-consecutive ports.
• This switch provides a total of 7 masks for filtering functions,
including IP-MAC address packet filtering, NetBIOS packet filtering,
DHCP packet filtering, and ACLs. One mask is allocated to DHCP
Console(config)#filter netbios add 1/1
Console(config)#