From: Gregory W. Posey Jr. (gposey@uaes.org)
Date: Sat Jun 05 2004 - 19:17:44 GMT-3
I believe the specific IP address of the DHCP server was specified. I'll
have to ask my friend again, because I can't imagine there being any
confusion if a directed broadcast was specified as the argument for "ip
helper-address" but let me check with him, and I'll get back to the list.
Thank you,
Greg Posey Jr.
CCIE #7981
CCSP, CCSE
M.S. EE
-----Original Message-----
From: Nick Payton [mailto:cisco@paytonsplace.net]
Sent: Saturday, June 05, 2004 5:08 PM
To: 'Gregory W. Posey Jr.'; ccielab@groupstudy.com
Subject: RE: IP Helper & Directed Broadcast
Greg,
Did you specify the DHCP server's address on the IP Helper address or did
you specify the network broadcast the DHCP server resides on?
Nick
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Gregory W. Posey Jr.
Sent: Saturday, June 05, 2004 3:03 PM
To: ccielab@groupstudy.com
Subject: IP Helper & Directed Broadcast
Quick question A buddy of mine and I were discussing what happens when you
use IP Helper for DHCP, and we were wondering WHY there is a need to have ip
directed-broadcast turned on for the interface where the DHCP server is. If
the broadcast from the client gets converted to a unicast for the DHCP
server, then where does directed-broadcast come into the picture.
To top it off, he threw on a sniffer and verified that the traffic being
sent to the DHCP server was unicast (in both the Layer 2 and Layer 3 senses
of the word), yet when he disabled directed broadcasts, he was unable to
obtain an IP address for his client.
Any insights (or is it just the way that Cisco has implemented the feature,
no standards/technologies that actually make this necessary)?
Thank you,
Greg Posey Jr.
CCIE #7981
CCSP, CCSE
M.S. EE
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