[mpls-linux-general] Error: Packet exceeded MTU

[<gui...@ya...>]

Hello,

I'm testing a mpls network at new machines but I have
problems with TCP communications between them.

I'm using the 1.946 version of MPLS in FC2 with kernel
2.6.9 compiled to don't generate debug. The machines
are Intel XEON with 82546EB Gigabit Ethernet
Controllers.

I didn't connect IP HOSTS at LER's yet. My network is
configured like the drawing below:


        1000 ->      2000 ->


[LER A] -------- LSR ------- [LER B]
     .0.1    .0.2   .1.1     .1.2 

        <- 1100      <- 2100         



-----
LER A
-----

ifconfig eth0 10.0.0.1 netmask 255.255.255.0 broadcast
10.0.0.255

mpls nhlfe add key 0 
mpls nhlfe change key 0x2 instructions push gen 1000
nexthop eth0 ipv4 10.0.0.2
ip route add 10.0.1.2/32 via 10.0.0.2 spec_nh 0x8847
0x2

mpls labelspace add dev eth0 labelspace 0
mpls ilm add label gen 1100 labelspace 0

-----
LSR 
-----

ifconfig eth0 10.0.0.2 netmask 255.255.255.0 broadcast
10.0.0.255
ifconfig eth1 10.0.1.1 netmask 255.255.255.0 broadcast
10.0.1.255

mpls nhlfe add key 0 
mpls nhlfe change key 0x2 instructions push gen 2000
nexthop eth1 ipv4 10.0.1.2
mpls nhlfe add key 0 
mpls nhlfe change key 0x3 instructions push gen 1100
nexthop eth0 ipv4 10.0.0.1

mpls labelspace add dev eth0 labelspace 0
mpls ilm add label gen 1000 labelspace 0
mpls labelspace add dev eth1 labelspace 0
mpls ilm add label gen 2100 labelspace 0

mpls xc add ilm_label gen 1000 ilm_labelspace 0
nhlfe_key 0x00000002
mpls xc add ilm_label gen 2100 ilm_labelspace 0
nhlfe_key 0x00000003

-----
LER B
-----

ifconfig eth0 10.0.1.2 netmask 255.255.255.0 broadcast
10.0.1.255

mpls nhlfe add key 0 
mpls nhlfe change key 0x2 instructions push gen 2100
nexthop eth0 ipv4 10.0.1.1
ip route add 10.0.0.1/32 via 10.0.1.1 spec_nh 0x8847
0x2

mpls labelspace add dev eth0 labelspace 0
mpls ilm add label gen 2000 labelspace 0

====================================================

The ping and ssh connections between LER1 and LER2 are
ok. I have problems when I try do transfer big files
by scp. The transfer starts for a little and get
stalled.

When I try to measure the traffic with Iperf (server
in LER B and client in LER A) I get the message below:

MPLS: packet exceeded MTU 2944 > 1500 (1496)

Am I doing something wrong?

Best Regards


		
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