From: Larry Letterman (lletterm@cisco.com)
Date: Thu May 05 2005 - 21:48:47 GMT-3
I personally consider forwarding a layer 2 task which moves the data/packet
from port 1 to
port 2 in a switch or router port..routing uses a route lookup table to get
the packet to the next hop
address and then forwards the packet to the correct interface..
############################
Larry Letterman
Cisco Systems
############################
----- Original Message -----
From: "John Matus" <john_matus@hotmail.com>
To: <bdennis@internetworkexpert.com>; <ccielab@groupstudy.com>
Sent: Thursday, May 05, 2005 7:32 PM
Subject: RE: ip helper-address command
> hmmm........not sure i understand the difference between routing and
> forwarding....perhaps forwarding does not use the routing table for it's
> decistion......<i dunno!!!> maybe they should change the test to the R &
S
> & F exam.
>
> >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 20:12:20 -0400
> >
> >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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