From: Jim (nhatquang@thiennam.org)
Date: Fri May 06 2005 - 05:31:31 GMT-3
If UDP destination port are out of supported types listed below, you must
specify which UDP port is forwarded by the command ip forward-protocol udp.
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:
a.. The MAC address of the received frame must be all-ones broadcast
address (ffff.ffff.ffff).
b.. 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.
c.. The IP time-to-live (TTL) value must be at least 2.
d.. The IP protocol must be UDP (17).
e.. 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.
----- Original Message -----
From: "Hai Minh" <minh@ipmac.com.vn>
To: <ccielab@groupstudy.com>
Sent: Friday, May 06, 2005 3:06 PM
Subject: Re: ip helper-address command
> From DocCD: Regardless of whether you implement IP helper addressing or
> UDP
> flooding, you must use the ip forward-protocol udp global configuration
> command to enable the UDP forwarding
>
> I think we have to use both two commands, "ip helper-address" and "ip
> forward-protocol udp"
>
>
> ----- Original Message -----
> From: "Brian Dennis" <bdennis@internetworkexpert.com>
> To: "John Matus" <john_matus@hotmail.com>; <ccielab@groupstudy.com>
> Sent: Friday, May 06, 2005 5:50 AM
> Subject: RE: ip helper-address command
>
>
>> Everything you ever wanted to know about the "ip helper-address" and "ip
>> forward-protocol udp" commands but were afraid to ask:
>>
>> http://www.cisco.com/univercd/cc/td/doc/cisintwk/idg4/nd2019.htm
>>
>> Direct from the DocCD ;-)
>>
>> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
>>
>> bdennis@internetworkexpert.com
>> Internetwork Expert, Inc.
>> http://www.InternetworkExpert.com
>> Toll Free: 877-224-8987
>> Direct: 775-745-6404 (Outside the US and Canada)
>>
>> -----Original Message-----
>> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>> John Matus
>> Sent: Thursday, May 05, 2005 2:54 PM
>> To: ccielab@groupstudy.com
>> Subject: ip helper-address command
>>
>> does the "ip helper-address" command need the "ip forward-protocol udp"
>> command in order to work correctly?
>>
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