From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed Jun 01 2005 - 20:14:58 GMT-3
John,
It's much simpler than all that.
you got a rtr -your HA - with 2 interfaces: s0/0 and e0/0 and you use
137.1.x.x/24 as your network addressing scheme.
This rtr happens to be running (take your pick, eigrp, ospf, rip, isis,
and/or bgp).
Now, you don't want your pc's attached to the ethernet ethernet int to have
the same subnet as the MN's.
So, all your MN get ip addresses out of 12.0.0.0 - your virtual network.
Now, how will pkts know where 12.0.0.0 is? Well, you redist this into your
IGP or BGP.
How will the MN know what their ip address is? You can use DHCP. And, the
MN must also be configured with the address of their HA. This can probably
also be done via DHCP but I'm just guessing about that.
So, all you do is create the virtual network and redist into your routing
protocol. Then you allocate ip addresses from this network to your MN's.
Bingo, you're done (with this part of it).
Last Saturday, I posted a detailed write-up on Mobile IP. Read it. I think
it will help you more fully understand this technology. I also strongly
recommend the Cisco Press book on the topic. It's how I learned what little
I know about this.
HTH, Tim
-----Original Message-----
From: John Matus [mailto:john_matus@hotmail.com]
Sent: Wednesday, June 01, 2005 6:42 PM
To: ccie2be@nyc.rr.com; ccielab@groupstudy.com
Subject: RE: ip mobile virtual-network
ok, so the virtual-metwork is the pseudo-network that would be assigned to
the MN on the HA side, or, it is the local-address assigned to the
MN...................but, is this allocated from internal address space or
external address space? does the virtual network need to be a routable ip
address? if a client wanted to send an email from pda to pda, how would
they know what address to send to? hmmm......perhaps there is a nat'ing
feature involved in with the virtual-networks.
>From: "ccie2be" <ccie2be@nyc.rr.com>
>To: "'John Matus'" <john_matus@hotmail.com>, <ccielab@groupstudy.com>
>Subject: RE: ip mobile virtual-network
>Date: Wed, 1 Jun 2005 18:33:30 -0400
>
>John,
>
>I didn't really understand the idea behind virtual networks either after
>having read the Doc-CD several times. But, after reading the new book on
>Mobile IP, I now understand it perfectly.
>
>It's actually not a difficult concept.
>
>Suppose your network provide connectivity for devices like laptops, pda's,
>ip cell phones that never actually physically connect to your network.
>
>Since these devices never physically connect to your network, there's
>really
>no reason to allocate a physical interface for these devices just so you
>can
>assign ip subnet.
>
>So, instead of allocating a physical interface and assigning an ip subnet
>to
>this interface, what you do instead is create a virtual network. From this
>virtual network, you allocate ip addresses to all these devices.
>
>Now, when these devices are away from their home network which is all the
>time, pkts sent to these devices will go to the HA router. From there, the
>HA will create a tunnel to the FA when these device actually attach to the
>network.
>
>For pkts to these MN to get to the HA in the first place, keep in mind,
>that
>this virtual network must be know throughout the entire network. This
>means
>that this virtual network must be included in the routing process.
>
>In the Mobile IP book, they talk about redist this network into the IGP,
>but
>I suspect that if you configure your IGP to cover this virtual network,
>that
>might also work. But, on this last point, I'm not sure.
>
>HTH, Tim
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>John
>Matus
>Sent: Wednesday, June 01, 2005 6:08 PM
>To: ccielab@groupstudy.com
>Subject: ip mobile virtual-network
>
>what is the virtual network? is it an arbitrary address assigned for the
>tunneling of the traffic from the HA to the FA? i think it's safe to
>assume
>
>that is is not the home network or the network associated with the FA......
>
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