From: C Chan (cch.ccie@gmail.com)
Date: Sun Mar 01 2009 - 21:02:50 ARST
Hi Expert,
Whenever the DHCP server (eg 172.16.1.1) is located remotely, we ususally
use "ip helper-address 172.16.1.1" in local router interface (eg
192.168.1.254) in order to grant IP address to local user. As I know, the
local router will unicast the DHCP packet (src 192.168.1.254 udp 67, dest
172.16.1.1 udp 68) to DHCP server. How will the DHCP server reply? Does it
unicast back the DHCP packet to router's interface (ie 192.168.1.254)? or
DHCP will reply to a directed-broadcast address of request LAN (ie
192.168.1.*255*)?
Where can I find a cisco official doc to describe the actual L3 packet
exchange?
Chan
Blogs and organic groups at http://www.ccie.net
This archive was generated by hypermail 2.1.4 : Mon Apr 06 2009 - 06:44:03 ART