trictrac a écrit :
avec quels parametres en particulier ??
Pour authoriser UNIQUEMENT le WoL dans le cadre du helper address ..
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ip forward-protocol
To specify which protocols and ports the router forwards when forwarding broadcast packets, use the ip forward-protocol command in global configuration mode. To remove a protocol or port, use the no form of this command.
ip forward-protocol {udp [port] | nd | sdns}
no ip forward-protocol {udp [port | nd | sdns}
Syntax Description
udp
Forwards User Datagram Protocol (UDP) packets. See the "Usage Guidelines" section for a list of port numbers forwarded by default.
port
(Optional) Destination port that controls which UDP services are forwarded.
nd
Forwards Network Disk (ND) packets. This protocol is used by older diskless Sun workstations.
sdns
Secure Data Network Service.
Defaults
Enabled
Command Modes
Global configuration
Command History
Release Modification
10.0
This command was introduced.
Usage Guidelines
Enabling a helper address or UDP flooding on an interface causes the Cisco IOS software to forward particular broadcast packets. You can use the ip forward-protocol command to specify exactly which types of broadcast packets you would like to have forwarded. A number of commonly forwarded applications are enabled by default. Enabling forwarding for some ports [for example, Routing Information Protocol (RIP)] may be hazardous to your network.
If you use the ip forward-protocol command, specifying only UDP without the port enables forwarding and flooding on the default ports.
One common application that requires helper addresses is Dynamic Host Configuration Protocol (DHCP). DHCP is defined in RFC 1531. DHCP protocol information is carried inside of BOOTP packets. To enable BOOTP broadcast forwarding for a set of clients, configure a helper address on the router interface closest to the client. The helper address should specify the address of the DHCP server. If you have multiple servers, you can configure one helper address for each server. Because BOOTP packets are forwarded by default, DHCP information can now be forwarded by the software. The DHCP server now receives broadcasts from the DHCP clients.
If an IP helper address is defined, UDP forwarding is enabled on default ports. If UDP flooding is configured, UDP flooding is enabled on the default ports.
If a helper address is specified and UDP forwarding is enabled, broadcast packets destined to the following port numbers are forwarded by default:
•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)
•Boot Protocol (BOOTP) client and server packets (ports 67 and 68)
•TACACS service (port 49)
•IEN-116 Name Service (port 42)
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Note If UDP port 68 is used as the destination port number, it is not forwarded by default.
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Examples
The following example defines a helper address and uses the ip forward-protocol command. Using the udp keyword without specifying any port numbers will allow forwarding of UDP packets on the default ports.
ip forward-protocol udp
interface ethernet 1
ip helper-address 10.24.42.2
