[j-nsp] L2TP Multilink not working

[Jonas Frey]

Hello,

i am trying to do mppp with a M7i with integrated ASM acting as a LNS.
Multilink doesnt seem to work. The problem seems to be the negotiation
of the MRRU between the M7i and the CPE. There is no way to configure
the MRRU on the M7i for L2TP.

This dump is from a cisco 1841:

Dec  2 00:49:23.041: Vi2 LCP: O CONFACK [REQsent] id 243 len 18
Dec  2 00:49:23.041: Vi2 LCP:    MRU 1492 (0x010405D4)
Dec  2 00:49:23.041: Vi2 LCP:    AuthProto PAP (0x0304C023)
Dec  2 00:49:23.041: Vi2 LCP:    MagicNumber 0x2931D269 (0x05062931D269)
Dec  2 00:49:23.041: Vi2 LCP: I CONFREJ [ACKsent] id 1 len 20
Dec  2 00:49:23.041: Vi2 LCP:    MRRU 1524 (0x110405F4)
Dec  2 00:49:23.041: Vi2 LCP:    EndpointDisc 1 funworks 
(0x130C0166756E776F726B7320)
Dec  2 00:49:23.041: Vi2 LCP: O CONFREQ [ACKsent] id 2 len 14
Dec  2 00:49:23.041: Vi2 LCP:    MRU 1492 (0x010405D4)
Dec  2 00:49:23.041: Vi2 LCP:    MagicNumber 0x220F7774 (0x0506220F7774)


On the juniper:

Dec  2 01:49:23 jnp_ppp_thread_get_event: Ses 13125/62684 0x85f5d00:
state ppp_pap_server_initial processing event AUTH OK (19)
Dec  2 01:49:23 Ses 13125/62684 PPP: Server auth OK
Dec  2 01:49:23 Ses 13125/62684 PPP: I magic 0x220f7774 O magic
0x2931d269 I mru 1500 O mru 1492
Dec  2 01:49:23 Ses 13125/62684 PPP: I mrru 0 O mrru 0
Dec  2 01:49:23 Ses 13125/62684 shdsl-xxx PPP: idle 0 keepalive 10
interface
Dec  2 01:49:23 Ses 13125/62684 shdsl-xxx PPP: cos  0 0 0  overhead 0
cell 0
Dec  2 01:49:23 fill_service_interface using tunnel_if_id


As you can see, the juniper sets the MRRU for both incoming and outgoing
to 0.

As there is no way to configure the MRRU i really wonder how MPPP should
work for L2TP?

Regards,
Jonas Frey