Zhang,
The purpose of the helper address is to allow a certain amount of
broadcasts to go from one broadcast domain into another.
For example. Say you have a Windows DHCP server hanging off
e0..........and you have some clients that would like to use that DHCP
server but they are on e1. Well DHCP requires a certain amount of
broadcast interaction to function. The broadcasts generated from clients
off e1 will never see the DHCP server in e0. So we do like this:
int e0
ip address 192.168.1.0 255.255.255.0
int e1
ip address 10.1.1.1 255.255.255.0
ip helper-address 192.168.1.255
What we have done here, is transferred a certain amount of broadcast
traffic from e1, over to e0. Not all broadcasts are transferred, only
certain well known services like DHCP, Windows Login, and a few others.
You can either set the helper address to be the broadcast address of the
network you want to reach, as I did above. Or, if you are just wanting to
get the traffic to a specific server, then you can make the helper-address
a unicast address.
Brian
-----------------------------------------------------
Brian Feeny, CCNA [EMAIL PROTECTED]
318-222-2638 x 109 http://www.shreve.net/~signal
Network Administrator ShreveNet Inc. (ASN 11881)
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