From: Jonathan Hays (nomad@gfoyle.org)
Date: Mon Dec 15 2003 - 19:23:11 GMT-3
you wrote:
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Brian McGahan
Sent: Monday, December 15, 2003 3:52 PM
To: 'Pun, Alec CL'; ccielab@groupstudy.com
Subject: RE: ip helper-address
Alec,
Technically the "ip forward-protocol udp" command does need to
be
configured to forward dhcp requests with the "ip helper-address"
command.
It's just that "ip forward-protocol udp bootps" is default:
Router(config)#ip forward-protocol udp 67
Router(config)#do sh run | in forward-protocol
Router(config)#no ip forward-protocol udp 67
Router(config)#do sh run | in forward-protocol
no ip forward-protocol udp bootps
If you disable the port, as Chuck suggested, the packet cannot
be
forwarded.
HTH,
Brian McGahan, CCIE #8593
bmcgahan@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 708-362-1418 (Outside the US and Canada)
= = =
Brian,
Sorry, but I must respectfully question the need to configure the "ip
forward-protocol udp 67" in addition to "ip helper-address" just to get
DHCP proxy functions to work. I have set up this "DHCP proxy" feature
for many clients using only the "ip helper-address" command on the
ethernet interface, and I don't recall having needed the "ip
forward-protocol udp 67" to get things working. In point of fact the "ip
helper-address" command enables forwarding on udp 67 so what would be
the point of configuring this command, unless you had previously entered
"no ip forward-protocol udp 67" for some reason?
Or are you trying to say that the "ip helper-address" command is
actually a sort of macro that executes "ip forward-protocol udp 67" but
it doesn't show up in the "sh run" output since it's the default?
Please clarify,
Jonathan
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