From: Brouwer Dale-ADB080 (D.Brouwer@xxxxxxxxxxxx)
Date: Wed May 29 2002 - 18:58:27 GMT-3
Use the "ip helper-address" & "ip forward-protocol" commands on
Router A to properly forward the DHCP requests to the LAN off router B.
Then use the "ip directed-broadcast #" command on Router B LAN interface
where # is the number of an extended access list in order to specifically
control what directed broadcast you allow and deny.
-----Original Message-----
From: Ty Bindrup [mailto:LPTBindr@ihc.com]
Sent: Wednesday, May 29, 2002 4:33 PM
To: ccielab@groupstudy.com
Subject: broadcast forwarding
IOS Wizards,
I need to find out how I can selectively forward broadcasts to another
site with the following constraints...
1. I have client hosts on ethernet 0 interface on router A. Router A
is connected to router B which, is connected to a DHCP server and an App
server that listens for UDP broadcasts on port 665.
2. All hosts need to receive IP addresses via the DHCP server off of
router B.
3. Because of security issues, I must be specific as to which hosts
may broadcast out to the App server off of router B. All hosts use a
client application that broadcasts out UDP port 665, however, I only
want broadcasts from a handful of clients to actually reach the app
server off of router B.
How do I controll which broadcasts may reach the app server and still
allow DHCP relay to work? I'm familiar with using the "ip
helper-address" in conjuction with the "ip forward-protocol" statement".
However, I don't see how I can be more granular with broadcast
control.
Also, using the "ip directed-broadcast" statement only allows me to
control broadcasts at layer 3.
Let me know if any of you know a way to accomplish what I need to do.
TIA.
Regards,
Ty
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