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broadcast only on the 30 network interface will allow anyone from any other networks (10, 20, 40,
50) to send directed broadcast to the 30 network.
Example
This example shows how to enable IP directed broadcasts on VLAN 1:
C2(su)->router(Config)#interface vlan 1
C2(su)->router(Config-if(Vlan 1))#ip directed-broadcast
ip forward-protocol
Use this command to enable UDP broadcast forwarding and specify which protocols will be
forwarded.
Syntax
ip forward-protocol udp [port]
no ip forward-protocol udp [port]
Parameters
udp
port
Defaults
If port is not specified, the following defaults are used:
•
Trivial File Transfer Protocol (TFTP) (port 69)
•
Domain Naming System (port 53)
•
Time service (port 37)
•
NetBIOS Name Server (port 137)
•
NetBIOS Datagram Server (port 138)
•
TACACS service (port 49)
•
EN‐116 Name Service (port 42)
Mode
Router command, Global configuration: C2(su)‐>router(Config)#
Router interface configuration: C2(su)‐>router(Config‐if(Vlan 1)#
Usage
In order to actually forward protocols, you must configure an IP helper address on the individual
router interfaces with the command "ip helper‐address" (page 19‐14).
If a certain service exists inside the node, and there is no need to forward the request to remote
networks, the "no" form of this command should be used to disable the forwarding for the specific
port. Such requests will not be automatically blocked from being forwarded just because a service
for them exists in the node.
The no form of this command removes a UDP port or protocol, disabling forwarding.
Specifies UDP as the IP forwarding protocol.
(Optional) Specifies a destination port that controls which UDP services
are forwarded.
ip forward-protocol
SecureStack C2 Configuration Guide 19-13
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