[mpls-linux-devel] L2 VPN with MPLS - another problem

[Pali <pal...@gm...>]

Hi mpls community,
I successfully run

 *MPLS-Linux labs – 5.1 Layer 2 VPN with MPLS*
*http://www.sj.ifsc.edu.br/~msobral/RCO2/docs/mpls-linux/5-1-layer2_vpn.html
*

using last stable Etch Debian with kernel 2.6.15.1 and mpls v1.950 patch. No
more kernel panic appear, just kernel oops when I execute *del_mpls.sh* with
no previous mpls configuration.

Linux routers are quite stable, on uplink direction (A1->A3) everything
works fine, broadcast, and arp request successfully travel from A1 to A3. No
traffic return back, even I see arp reply on A3. Let me describe situation:

A1: ping 172.16.30.30 or arping -i eth2 172.16.30.30
E2: receive ICMP echo request on eth1, encapsulate as two layer MPLS packet
(1000,100) and send out on eth0.
E3: receive MPLS packet, change top label 1000 to 3000 and send MPLS packet
(3000,100) from outgoing interface eth2.
E1: receive MPLS packet (3000,100), remove all labels and send Ethernet
frame from outging eth1
A3: receive arp request on 172.16.30.30, because it has requested IP
address, if replay with ARP-reply, that 172.16.30.30 is available under MAC
address 00:0c:29:54:f1:0d
E1: receive no ARP replay so it encapsulate no traffic back to E3->E2->A1.
Here is the problem that I need to solve.

I have same results with ping (L3) and arping (L2), even if I configure
staticly MAC address of remote computer on A1 and A3

example of static assignment:
A3: arp -v -i eth0 -s 172.16.30.10 00:0c:29:53:64:53

When I bypass MPLS network and connect A1 and A3 directly, everything works
as expected, even with static MAC address assignment.

Any ideas what could be wrong?
I have this topology connected and freeze as virtual machines on VMware
Workstation, so I can provide anytime all information, that You will
request. I will search also mpls-linux mailing list archive if I found
something.

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