From: Ozgur Guler (Garanti Teknoloji) (OzgurG@garanti.com.tr)
Date: Sun Dec 14 2003 - 13:20:13 GMT-3
CCO
-----
All of the following conditions must be met in order for a UDP or IP packet to be helpered by the ip helper-address command:
The MAC address of the received frame must be all-ones broadcast address (ffff.ffff.ffff).
The IP destination address must be one of the following: all-ones broadcast (255.255.255.255), subnet broadcast for the receiving interface; or major-net broadcast for the receiving interface if the no ip classless command is also configured.
The IP time-to-live (TTL) value must be at least 2.
The IP protocol must be UDP (17).
The UDP destination port must be for TFTP, Domain Name System (DNS), Time, NetBIOS, ND, BOOTP or DHCP packet, or a UDP port specified by the ip forward-protocol udp global configuration command.
Ozgur
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Pun, Alec CL
Sent: Sunday, December 14, 2003 6:02 PM
To: ccielab
Subject: ip helper-address
When I use ip helper-address to handle, say DHCP request where the server is
located on another subnet, do I need to use ip forward-protocol udp as well
? If not, when to use this command ?
tks
alec
This archive was generated by hypermail 2.1.4 : Sat Jan 03 2004 - 08:25:40 GMT-3