mpls-linux-general

[mpls-linux-general] ebtables info

[Ricardo F. <ric...@fe...>]

Hello,
I am doing a network to use MPLS with several terminal machines ( this
have IPs) and to connect all i have a layer 2 network made by computers
that are going to route the traffic using MPLS. I need to know, in this
middle computers, the neightbours MAC to build the path between the
terminal machines ( that have IPS). My problem is that ARP need to
associate a MAC to a IP, which i do not have in this middle  computers.
So i was wondering if ebtables could help me build a "arp" table, i.e.,
the computer PC2 that is connected to one final terminal PC1 ( that has
an IP) sends back to the network, in broadcast, a specific frame with is
own  PC2-MAC, and the terminal PC1 MAC-IP pair. The PC3 listen to this
frame and stores that the route to the IP of PC1 is using PC2. PC3 does
exactly the same and so on. PC4 does the as PC2 when PC5 connects to it.
I want to know if ebtables could help me build specific frames and how
to send them to the network and how to catch them.


EX.:

   PC1----------PC2--------PC3------PC4--------PC5
(MAC/IP)   (MAC)    (MAC)  (MAC)   (MAC/IP)




If someone could help me i would appreciated.
Thank you and sorry for the bad spelling english.

Re: [mpls-linux-general] ebtables info

[Adrian P. <adr...@gm...>]

Hello,
You can try by manually setting MAC-IP mappings and bypass the ARP mechanism
(this way you can test your mpls testbed). You can try with something like:
 arp [-v]   [<HW>] [-i <if>] -s  <host> <hwaddr> [temp]            <-Add
entry
 arp -s 1.2.3.4 00:11:22:33:44:55

You can view your mappings with arp -n.

Good luck!


On Tue, May 19, 2009 at 3:29 AM, Ricardo Faria <ric...@fe...>wrote:

> Hello,
> I am doing a network to use MPLS with several terminal machines ( this
> have IPs) and to connect all i have a layer 2 network made by computers
> that are going to route the traffic using MPLS. I need to know, in this
> middle computers, the neightbours MAC to build the path between the
> terminal machines ( that have IPS). My problem is that ARP need to
> associate a MAC to a IP, which i do not have in this middle  computers.
> So i was wondering if ebtables could help me build a "arp" table, i.e.,
> the computer PC2 that is connected to one final terminal PC1 ( that has
> an IP) sends back to the network, in broadcast, a specific frame with is
> own  PC2-MAC, and the terminal PC1 MAC-IP pair. The PC3 listen to this
> frame and stores that the route to the IP of PC1 is using PC2. PC3 does
> exactly the same and so on. PC4 does the as PC2 when PC5 connects to it.
> I want to know if ebtables could help me build specific frames and how
> to send them to the network and how to catch them.
>
>
> EX.:
>
>   PC1----------PC2--------PC3------PC4--------PC5
> (MAC/IP)   (MAC)    (MAC)  (MAC)   (MAC/IP)
>
>
>
>
> If someone could help me i would appreciated.
> Thank you and sorry for the bad spelling english.
>
>
>
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[mpls-linux-general] Use an ID instead of IP

[Ricardo F. <ric...@fe...>]

Hello,

i want to use MPLS in a ethernet network, layer 2, but to add the mpls
routes i have to use the IP destination.
I was wondering if i use an id, any kind of id, (f.e., mpls nhlfe add
key 0 instructions push gen 1000 nexthop eth5 ipv4 1234), instead of
ip,  and i associate that id with the MAC address off the next
hop/destination, in the arp table, the packets would reach the destination?

Best regards,
Ricardo

[mpls-linux-general] mpls in layer 2 equipment (pc working as switch)

[Ricardo F. <ric...@fe...>]

Hello.

It is possible to use MPLS in a layer 2 (data link) equipment? 

I want to connect several pcs, with IPs, with layer 2 equipments (pc working
as switch) running MPLS. This means that this switch-pcs don't have IPs.
Therefore, the mpls nhlfe command cannot be performed between 2 switch-pcs,
(again, no IP exists, only MAC). 

Also, I cannot make ip route add. 

Any suggestion?

 

Thanks, 

Ricardo

 

Re: [mpls-linux-general] mpls in layer 2 equipment (pc working as switch)

[Adrian P. <adr...@gm...>]

Hello Ricardo,

By design, MPLS was not intended to run on switches. It was intended to
replace IP lookup in core routers - so it expects it connects routers. You
don't need MPLS for layer 2 because switches don't do "best match" table
lookup (like IP routers)- so the operation is not so costly.

You can connect 2 PCs in a simulated LAN environment over MPLS by creating a
layer 2 MPLS tunnel that will transport your Layer 2 traffic between the
PCs. Look at the Layer 2 VPN examples in the documentation if this is what
you are looking for. However, your PC Switches will need IPs on some
interfaces to communicate.

Regards,
Adrian

On Thu, May 28, 2009 at 1:52 PM, Ricardo Faria <ric...@fe...>wrote:

>   Hello.
>
> It is possible to use MPLS in a layer 2 (data link) equipment?
>
> I want to connect several pcs, with IPs, with layer 2 equipments (pc
> working as switch) running MPLS. This means that this switch-pcs don’t have
> IPs. Therefore, the mpls nhlfe command cannot be performed between 2
> switch-pcs, (again, no IP exists, only MAC).
>
> Also, I cannot make ip route add.
>
> Any suggestion?
>
>
>
> Thanks,
>
> Ricardo
>
>
>
>
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Re: [mpls-linux-general] mpls in layer 2 equipment (pc working as switch)

[James R. L. <jl...@mi...>]

The nexthop logic that is associated with a NHLFE is designed to
figure out how to deliver the MPLS packet to the next device.
In the linux kernel this is done via the 'neighbour' sub system which
handles all of the possible link types and there associated addressing
models.

It would be easy to modify the 'mpls' command to accept a MAC address
'nexthop eth1 MAC 00:0a:0a:0a:0a:0a', but I'm not quite sure how
easy it is to by-pass the neighbour subsystem.

If we get that far, then you could create MPLS tunnel interfaces
on your ingress LERs and point IP routes down the tunnels or use
ebtables to map ingress ethernet frames to an LSP.

I'm trying to finish up converting my development environment
and build scripts to GIT.  Once that is done I could start to look
into the feasability of use MACs as nexthops.

On Thu, May 28, 2009 at 11:52:28AM +0100, Ricardo Faria wrote:
> Hello.
> 
> It is possible to use MPLS in a layer 2 (data link) equipment? 
> 
> I want to connect several pcs, with IPs, with layer 2 equipments (pc working
> as switch) running MPLS. This means that this switch-pcs don't have IPs.
> Therefore, the mpls nhlfe command cannot be performed between 2 switch-pcs,
> (again, no IP exists, only MAC). 
> 
> Also, I cannot make ip route add. 
> 
> Any suggestion?
> 
>  
> 
> Thanks, 
> 
> Ricardo
> 
>  
> 

> ------------------------------------------------------------------------------
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> is a gathering of tech-side developers & brand creativity professionals. Meet
> the minds behind Google Creative Lab, Visual Complexity, Processing, & 
> iPhoneDevCamp as they present alongside digital heavyweights like Barbarian 
> Group, R/GA, & Big Spaceship. http://p.sf.net/sfu/creativitycat-com 
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> mpls-linux-general mailing list
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> https://lists.sourceforge.net/lists/listinfo/mpls-linux-general


-- 
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jl...@mi...