From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Thu May 05 2005 - 21:12:20 GMT-3
John,
The helper command is telling the router where to FORWARD the
packets not ROUTE the packets. Routing and forwarding are two totally
different things.
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 4:45 PM
To: Brian Dennis; ccielab@groupstudy.com
Subject: RE: ip helper-address command
hmmm......how and why would a router forward udp ports for netbios if
netbios is a non-routable protocol??
>From: "Brian Dennis" <bdennis@internetworkexpert.com>
>To: "John Matus" <john_matus@hotmail.com>,<ccielab@groupstudy.com>
>Subject: RE: ip helper-address command
>Date: Thu, 5 May 2005 19:38:28 -0400
>
>Key is to just know what you are trying to forward. The router will
>forward these UDP ports by default:
>
>37 Time Protocol
>49 TACACS
>53 DNS
>68 BootP Server
>69 TFTP
>137 NetBios
>138 NetBios Datagram
>
>If you want to forward any other UDP ports, you should specify them
with
>the "ip forward-protocol udp <port number>" command. If you do not
want
>the router to forward any of the default ports, use the "no ip
>forward-protocol udp <port number>" command.
>
>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: John Matus [mailto:john_matus@hotmail.com]
>Sent: Thursday, May 05, 2005 4:15 PM
>To: Brian Dennis; ccielab@groupstudy.com
>Subject: RE: ip helper-address command
>
>yes, that is an ugly document indeed. so it looks like the answer is
>"no"
>unless you're running lots of routers that are processing multiple
>duplicate
>broadcast request.
>
> >From: "Brian Dennis" <bdennis@internetworkexpert.com>
> >To: "John Matus" <john_matus@hotmail.com>,<ccielab@groupstudy.com>
> >Subject: RE: ip helper-address command
> >Date: Thu, 5 May 2005 18:50:44 -0400
> >
> >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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