L2TP server problem - RC5 & RC6

RouterOS General
1

I have 5 L2TP tunels (without IP sec) from MT to MT. On version 2.9.xx this work fine, but on RC5 and RC6 (x86) work fine 3 of 5 tunels.
Why?

I try change MTU, Auth mode (chap, pap, mschap2), a more other things. I have rule in mangle for changing MSS - clamp to pmtu.

2

I can confirm this behaviour. At RC6 (server) I reset config to default, assign IPs, enable L2TP server and create secret:

0   name="test" service=any caller-id="" password="***" profile=default
     local-address=192.168.10.200 remote-address=192.168.10.1 routes=""
     limit-bytes-in=0 limit-bytes-out=0

At client (2.9.45) I created dial-out interface with proper user/password. After I enable it, it’s try dial-out, at server is created dynamic interface l2tp0 with status “link established” but no uptime info. Server don’t assign IP to client. Client shows “link established” without uptime info.

I captured communication between client and server and it’s timeouts at ‘PPP LCP Configuration Request’ sent from client to server. Server don’t respond to it.

I try the same with pptp protocol and it works ok.