Link aggregation

[BERTRAND Joël <joel.bertrand%systella.fr@localhost>]

	Hello,

	I'm trying to aggregate two openvpn links between a Linux server 
(debian) and a NetBSD client (running 7.0.2).

	I suppose I have understood agr capabilities, I use it with a switch 
for a long time without trouble.

	On Linux side, I have started two openvpn servers (UDP configuration). 
Each VPN runs on a different VDSL2 link. I don't have openvpn 
configuration issue as this configuration runs fine without aggregation.

Linux
|
+- tap1 (UDP on ISP1)
+- tap2 (UDP on ISP2)

	I have added in /etc/network/interfaces:

auto bond0
iface bond0 inet static
        address 192.168.1.1
        netmask 255.255.255.0
        bond-slaves tap1 tap2
        bond_mode balance-rr

and I obtain a bond0 interface.

	On NetBSD side, I have tried to configure a new agr interface without 
success.

NetBSD
|
+- wm0 (WAN)
+- tap0 (to Linux's tap1)
+- tap1 (to Linux's tap2)
+- wm1
+- wm2

wm1 and wm2 are linked into agr0:

legendre# cat ifconfig.agr0
create
agrport wm1
agrport wm2
inet 192.168.10.128 netmask 255.255.255.0
up
!ifconfig wm1 up
!ifconfig wm2 up
legendre#

I have tried to create a new agr1 interface but it doesn't work as 
expected. Maybe I have misunderstood something.

ifconfig create agr1 creates a new interface. I have to add and remove 
agrports. Thus, I have written openvpn up and down scripts to add and 
remove agrports. Problem : when a tunnel stops, tap interface is 
dismounted and ifconfig returns :

agr1: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
	...
	agrport: , flags=0x3<COLLECTING,DISTRIBUTING>
	agrport: tap1, flags=0x3<COLLECTING,DISTRIBUTING>
	...

	Please note that tap0 is replaced by '' and this port cannot be delete 
anymore.

	I have created agr interface by hand (openvpn without inet/inet6 
parameters and I have added network configuration directly on agr1 
interface). I haven't obtain a running aggregated tunnel. I have tried 
to use link0 and -link0 parameters without success.

	Even with interfaces up on both sides, tunnel is unusable.

	Is it possible to write a configuration to aggregate two openVPN links 
between a Linux server an a NetBSD client ? And how can I manage agrport ?

	Best regards,

	JKB