Alcatel-Lucent 7705 Configuration Manual page 112

IP Router Command Reference
netmask — the subnet mask in dotted-decimal notation
dhcp — specifies that the IP address is assigned dynamically using DHCP
client-identifier ascii-value | interface-name — the DHCP client ID, either an ASCII string or
vendor-class-id — the DHCP vendor class ID that identifies the vendor type and configuration of
allow-directed-broadcasts
Syntax [no] allow-directed-broadcasts
Context config>router>interface
Description This command enables the forwarding of directed broadcasts out of the IP interface.
A directed broadcast is a packet received on a local router interface destined for the subnet broadcast
address of another IP interface. The allow-directed-broadcasts command on an IP interface enables
or disables the transmission of packets destined for the subnet broadcast address of the egress IP
interface.
When enabled, a frame destined for the local subnet on this IP interface is sent as a subnet broadcast
out this interface.
By default, directed broadcasts are not allowed and are discarded at this egress IP interface.
The no form of the command disables directed broadcasts forwarding out of the IP interface.
Default
no allow-directed broadcasts
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Values 0.0.0.0 to 255.255.255.255 (network bits all 1 and host bits all 0)
the interface name; each client attached to a subnet must have a unique identifier. If the string
contains special characters (#, $, spaces, etc.), the entire string must be enclosed within
double quotes. If the interface-name is specified, the system uses the MAC address of the
interface.
Values ascii-value — an ASCII string up to 64 characters (as per RFC
2132)
interface-name — hexadecimal MAC address (as per RFC 2132)
the DHCP client as a variable-length string of octets. If the string contains special characters
(#, $, spaces, etc.), the entire string must be enclosed within double quotes.
Values an ASCII string up to 64 characters (as per RFC 2132)
Note: Allowing directed broadcasts is a well-known mechanism used for denial-of-service
attacks.
7705 SAR OS Router Configuration Guide