today i found it in sw 4506 this:
ip helper-address x.x.x.255
in all vlan interface. it this correct????
thanks.
ip helper-address
Sep 30, 2005
2 Replies
It is if you want all broadcasts on any subnet to be forwarded as broadcasts on the x.x.x.0/24 subnet.
Not quite. By default ip helper-address command only forwards 8 udp ports. They are also not forwarded as broadcasts, they are converted to a unicast packet directed to the host specified by the command.
The default are:
37 Time Protocol 49 TACACS 53 DNS 67 BOOTP Client 68 BOOTP Server 69 TFTP 137 NetBios 138 NetBios DatagramIf you want to forward additional ports accross the routed interface you would use the ip forward-protocol command, if you wanted to remove any of the 8 default you would use the no ip forward-protocol again, under the routed interface.
formatting link
-Brian
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