mpls-linux-general

[mpls-linux-general] Simple examples, they do not work!

[Jung J. <jj...@hs...>]

Hi!

I have just read the manual and insalled mplsadm2, and iproute.
I have a simple network, like "2. Simle example":

-----------------------------------------------------
Host A:
eth1: 10.120.0.5
---------------
Host B
eth1: 10.120.0.6
-----------------------------------------------------

I would like to set up a manual LSP between them.
(as shown in example 2)

A:
mplsadm2 -AO 0    (out: key1)
mplsadm2 -O key1 -o push:gen:16:set:eth1:ipv4:10.120.0.6
ip route add 10.120.0.6/32 lsp key1
#out:RTNETLINK answers: no such device

what does it mean? what is RTNETLINK?
i think this host can not send
IP packets over mpls :)

mplsadm2 -AI gen:17:0
but can it receive packets?

mplsadm2 -L eth1:0
-----------------------------------------------------
And when I try to set up a tunnel:
(4. MPLS tunnel interfaces)

A:
mplsadm2 -AO 0 -o push:gen:1024:set:eth1:ipv4:10.120.0.6 (out:key2)
mplsadm2 -AT tunnel1
ifconfig tunnel1 10.120.0.5 netmask 255.255.255.255
mplsadm2 -BO key2 -T tunnel1
route add -host 10.120.0.6 tunnel1

and now Host A can send packets to host B
(with ethereal i can see it!!!)
and host B can send packets to Host A

BUT THEY CAN NOT RECEIVE PACKETS, JUST SEND!
(ping between A and B did not work)

what should i do?

regards!
jj

Re: [mpls-linux-general] Simple examples, they do not work!

[Ramon C. <cas...@in...>]

On Fri, 23 Jan 2004, Jung Janos wrote:

> Hi!
>
> mplsadm2 -AO 0    (out: key1)
> mplsadm2 -O key1 -o push:gen:16:set:eth1:ipv4:10.120.0.6
> ip route add 10.120.0.6/32 lsp key1
> #out:RTNETLINK answers: no such device

I am not really sure (I am mostly working on the 2.6 version with a new
mplsadm and debugging mechanisms that will make it easier to track bugs),
but I wonder if the eth1 interfcace is MPLS enabled? Try setting the
labelspace (e.g. to 0) before actually mapping the traffic to the LSP

mplsadm2 -L eth1:0

before
mplsadm2 -O key1 -o push:gen:16:set:eth1:ipv4:10.120.0.6

Idem for host B


> what does it mean? what is RTNETLINK?

The answer to that question is complicated and out of the scope of this
mail :-P but netlink is a linux kernel mechanism that allows user space
applications to communicate with parts of the kernel (for example to
get/set routes).


> i think this host can not send
> IP packets over mpls :)

It's being lazy....


Not sure if it answers your question, but it is worth trying.

Regards,

R.

Re: [mpls-linux-general] Simple examples, they do not work!

[Christian <c.t...@gm...>]

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Hash: SHA1

Hello!

Am Freitag, 23. Januar 2004 15:19 schrieb Jung Janos:
> mplsadm2 -AO 0    (out: key1)
> mplsadm2 -O key1 -o push:gen:16:set:eth1:ipv4:10.120.0.6
> ip route add 10.120.0.6/32 lsp key1
> #out:RTNETLINK answers: no such device
You need to specify your Device like:
ip route add 10.120.0.6 /32 dev eth1 lsp key1

I have written a litte script for the setup of a static route perhaps you f=
ind
it helpful:

=2D ---8<---
#!/bin/bash
#
# Script to setup a static mpls route between two hosts
#
# December 2003 - Christan Tr=F6ster
#

IP=3D"1.1.1.1"
KEY1=3D`mplsadm2 -A -O 0 2> /dev/null | grep Key | cut -d" " -f2`
DEVICE=3D"eth1"

echo "Setting up mpls route to $IP via $DEVICE using key $KEY1..."
mplsadm2 -O $KEY1 -o push:gen:16:set:$DEVICE:ipv4:$IP
ip route add $IP/32 dev $DEVICE lsp $KEY1
mplsadm2 -A -I gen:17:0
mplsadm2 -L $DEVICE:0
echo "done"
=2D ---8<---

Bye, Christian

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