l2tp reconnects every few minutes.

kameelperdza · Fri Sep 16, 2011 1:14 pm

Hi

I have eoip over l2tp connection. The routers has been running for 15 days without any problems.
But today i have checked and the l2tp connection reconnects all the time.

The wireless connection does not have connection problems and does not reconnect.

Router A (l2tp server)

-RB750G
-Routeros 5.6
-log export

# sep/16/2011 12: 1:52 by RouterOS 5.6
# software id = ZKEF-NLID
#
11:08:12 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:10:14 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:10:16 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:12:19 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:12:28 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:14:24 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:14:27 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:14:54 l2tp,ppp,info,account kkt1 logged out, 1224 46584 1014680 512 5152 
11:14:54 l2tp,ppp,info l2tp-in1: terminating... - administrator request 
11:14:54 l2tp,ppp,info l2tp-in1: disconnected 
11:14:54 l2tp,info first L2TP UDP packet received from 172.23.128.14 
11:14:54 l2tp,ppp,info <l2tp-0>: waiting for call... 
11:14:54 l2tp,ppp,info l2tp-in1: authenticated 
11:14:54 l2tp,ppp,info l2tp-in1: connected 
11:14:54 l2tp,ppp,info,account kkt1 logged in, 22.2.2.2 
11:14:54 l2tp,ppp,info l2tp-in1: using encoding - MPPE128 stateless 
11:16:29 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:16:37 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:18:34 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:18:42 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:20:39 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:20:43 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:22:44 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:22:49 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:24:49 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:24:49 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:26:54 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:26:57 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:28:59 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:29:02 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:31:04 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:31:04 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:33:09 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:33:11 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:34:11 l2tp,ppp,info,account kkt1 logged out, 1156 43145 916415 474 4495 
11:34:11 l2tp,ppp,info l2tp-in1: terminating... - administrator request 
11:34:11 l2tp,ppp,info l2tp-in1: disconnected 
11:34:11 l2tp,ppp,info <l2tp-0>: waiting for call... 
11:34:11 l2tp,ppp,info l2tp-in1: authenticated 
11:34:11 l2tp,ppp,info l2tp-in1: connected 
11:34:11 l2tp,ppp,info,account kkt1 logged in, 22.2.2.2 
11:34:11 l2tp,ppp,info l2tp-in1: using encoding - MPPE128 stateless 
11:35:14 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:35:18 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:37:19 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:37:20 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:39:24 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:39:26 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:41:29 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:41:32 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:43:34 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:43:44 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:44:28 l2tp,info first L2TP UDP packet received from 172.23.128.177 
11:44:28 l2tp,ppp,info <l2tp-0>: waiting for call... 
11:44:28 l2tp,ppp,info <l2tp-0>: authenticated 
11:44:28 l2tp,ppp,info <l2tp-0>: connected 
11:44:28 l2tp,ppp,info,account kkt1 logged in, 22.2.2.2 
11:44:28 l2tp,ppp,info <l2tp-kkt1>: using encoding - MPPE128 stateless 
11:44:35 l2tp,ppp,info,account kkt1 logged out, 624 23500 669899 261 3107 
11:44:35 l2tp,ppp,info l2tp-in1: terminating... - administrator request 
11:44:35 l2tp,ppp,info l2tp-in1: disconnected 
11:45:39 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:45:43 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:47:44 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:47:45 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:49:49 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:49:51 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:51:54 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:51:57 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:53:59 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:54:07 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:54:52 l2tp,ppp,info,account kkt1 logged out, 624 1796790 2751622 7628 12192 
11:54:52 l2tp,ppp,info <l2tp-kkt1>: terminating... - administrator request 
11:54:52 l2tp,ppp,info <l2tp-kkt1>: disconnected 
11:54:52 l2tp,info first L2TP UDP packet received from 172.23.128.14 
11:54:52 l2tp,ppp,info <l2tp-0>: waiting for call... 
11:54:52 l2tp,ppp,info l2tp-in1: authenticated 
11:54:52 l2tp,ppp,info l2tp-in1: connected 
11:54:52 l2tp,ppp,info,account kkt1 logged in, 22.2.2.2 
11:54:52 l2tp,ppp,info l2tp-in1: using encoding - MPPE128 stateless 
11:56:04 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:56:06 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
11:56:09 l2tp,info first L2TP UDP packet received from 172.23.128.177 
11:56:09 l2tp,ppp,info <l2tp-0>: waiting for call... 
11:56:09 l2tp,ppp,info <l2tp-0>: authenticated 
11:56:09 l2tp,ppp,info <l2tp-0>: connected 
11:56:09 l2tp,ppp,info,account kkt1 logged in, 22.2.2.2 
11:56:09 l2tp,ppp,info <l2tp-kkt1>: using encoding - MPPE128 stateless 
11:56:16 l2tp,ppp,info,account kkt1 logged out, 84 2823 87645 37 501 
11:56:16 l2tp,ppp,info l2tp-in1: terminating... - administrator request 
11:56:16 l2tp,ppp,info l2tp-in1: disconnected 
11:56:22 system,info,account user Emile logged in from 192.168.0.123 via winbox 
11:56:40 system,info,account user Emile logged out from 192.168.0.123 via winbox 
11:58:03 system,info,account user Emile logged in from 192.168.0.101 via winbox 
11:58:09 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
11:58:12 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
12:00:14 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 32 
12:00:21 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 32 
12:01:32 system,info,account user Emile logged in from 192.168.0.101 via winbox 
12:01:40 system,info,account user Emile logged in from 192.168.0.101 via telnet

Router B (l2tp client)

-RB433
-Routeros 4.10
-log export

# sep/16/2011 12: 1:13 by RouterOS 4.10
# software id = N0YN-NAKI
#
11:24:49 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:26:54 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:26:57 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:28:59 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:29:02 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:31:04 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:31:04 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:33:09 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:33:11 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:34:10 l2tp,ppp,info l2tp-out1: terminating... - session closed 
11:34:10 l2tp,ppp,info l2tp-out1: disconnected 
11:34:10 l2tp,ppp,info l2tp-out1: initializing... 
11:34:10 l2tp,ppp,info l2tp-out1: dialing... 
11:34:10 l2tp,ppp,info l2tp-out1: terminating... - old tunnel is not closed yet 
11:34:11 l2tp,ppp,info l2tp-out1: disconnected 
11:34:11 l2tp,ppp,info l2tp-out1: initializing... 
11:34:11 l2tp,ppp,info l2tp-out1: dialing... 
11:34:11 l2tp,ppp,info l2tp-out1: terminating... - old tunnel is not closed yet 
11:34:11 l2tp,ppp,info l2tp-out1: disconnected 
11:34:11 l2tp,ppp,info l2tp-out1: initializing... 
11:34:11 l2tp,ppp,info l2tp-out1: dialing... 
11:34:11 l2tp,ppp,info l2tp-out1: authenticated 
11:34:11 l2tp,ppp,info l2tp-out1: connected 
11:34:11 l2tp,ppp,info l2tp-out1: using encoding - MPPE128 stateless 
11:35:14 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:35:18 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:37:19 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:37:20 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:39:24 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:39:26 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:41:29 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:41:32 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:43:34 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:43:44 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:44:27 l2tp,ppp,info l2tp-out1: terminating... - session closed 
11:44:27 l2tp,ppp,info l2tp-out1: disconnected 
11:44:27 l2tp,ppp,info l2tp-out1: initializing... 
11:44:27 l2tp,ppp,info l2tp-out1: dialing... 
11:44:27 l2tp,ppp,info l2tp-out1: terminating... - old tunnel is not closed yet 
11:44:27 l2tp,ppp,info l2tp-out1: disconnected 
11:44:27 l2tp,ppp,info l2tp-out1: initializing... 
11:44:27 l2tp,ppp,info l2tp-out1: dialing... 
11:44:27 l2tp,ppp,info l2tp-out1: terminating... - old tunnel is not closed yet 
11:44:27 l2tp,ppp,info l2tp-out1: disconnected 
11:44:28 l2tp,ppp,info l2tp-out1: initializing... 
11:44:28 l2tp,ppp,info l2tp-out1: dialing... 
11:44:28 l2tp,ppp,info l2tp-out1: authenticated 
11:44:28 l2tp,ppp,info l2tp-out1: connected 
11:44:28 l2tp,ppp,info l2tp-out1: using encoding - MPPE128 stateless 
11:45:39 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:45:43 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:47:44 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:47:45 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:49:49 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:49:51 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:51:54 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:51:57 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:53:59 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:54:07 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:54:52 l2tp,ppp,info l2tp-out1: terminating... - session closed 
11:54:52 l2tp,ppp,info l2tp-out1: disconnected 
11:54:52 l2tp,ppp,info l2tp-out1: initializing... 
11:54:52 l2tp,ppp,info l2tp-out1: dialing... 
11:54:52 l2tp,ppp,info l2tp-out1: terminating... - old tunnel is not closed yet 
11:54:52 l2tp,ppp,info l2tp-out1: disconnected 
11:54:52 l2tp,ppp,info l2tp-out1: initializing... 
11:54:52 l2tp,ppp,info l2tp-out1: dialing... 
11:54:52 l2tp,ppp,info l2tp-out1: terminating... - old tunnel is not closed yet 
11:54:52 l2tp,ppp,info l2tp-out1: disconnected 
11:54:52 l2tp,ppp,info l2tp-out1: initializing... 
11:54:52 l2tp,ppp,info l2tp-out1: dialing... 
11:54:52 l2tp,ppp,info l2tp-out1: authenticated 
11:54:52 l2tp,ppp,info l2tp-out1: connected 
11:54:52 l2tp,ppp,info l2tp-out1: using encoding - MPPE128 stateless 
11:56:04 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:56:06 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:56:08 l2tp,ppp,info l2tp-out1: terminating... - session closed 
11:56:08 l2tp,ppp,info l2tp-out1: disconnected 
11:56:08 l2tp,ppp,info l2tp-out1: initializing... 
11:56:08 l2tp,ppp,info l2tp-out1: dialing... 
11:56:08 l2tp,ppp,info l2tp-out1: terminating... - old tunnel is not closed yet 
11:56:08 l2tp,ppp,info l2tp-out1: disconnected 
11:56:08 l2tp,ppp,info l2tp-out1: initializing... 
11:56:08 l2tp,ppp,info l2tp-out1: dialing... 
11:56:08 l2tp,ppp,info l2tp-out1: terminating... - old tunnel is not closed yet 
11:56:09 l2tp,ppp,info l2tp-out1: disconnected 
11:56:09 l2tp,ppp,info l2tp-out1: initializing... 
11:56:09 l2tp,ppp,info l2tp-out1: dialing... 
11:56:09 l2tp,ppp,info l2tp-out1: authenticated 
11:56:09 l2tp,ppp,info l2tp-out1: connected 
11:56:09 l2tp,ppp,info l2tp-out1: using encoding - MPPE128 stateless 
11:58:09 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
11:58:12 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
11:58:48 system,info,account user Emile logged in from 192.168.0.101 via winbox 
11:58:49 system,info,account user Emile logged in from 192.168.0.101 via telnet 
11:58:49 system,info,account user Emile logged in from 192.168.0.101 via telnet 
12:00:14 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:06:4f:7b:bb:ab, proto 2, 192.168.0.1->224.0.0.1, len 8 
12:00:21 firewall,info Filter: input: in:bridge1 out:(none), src-mac 00:21:4c:91:41:77, proto 2, 192.168.0.6->224.0.0.1, len 8 
12:00:30 system,info,account user Emile logged in from 192.168.0.101 via telnet 
12:00:31 system,info,account user Emile logged in from 192.168.0.101 via telnet

ANy help would be greatly apreciated.

mp3turbo · Sun Oct 16, 2011 12:11 pm

I have identical issue. RB411U connecting to RB493U. L2tp server + client, no ciphering, tried v5.6 and v5.7. Mikrotiks are located on the same table, but the intention is to create 3G network over the country. RB411 has 3G modem huawei 1752, connection is absolutely stable and does not drop. There is no filtering, no mangling, absolutely nothing... just IP address, default route, ppp secret, l2tp server enabled. The same applies to client. No WIFI at all. No traffic at all, no clients, just these two routers against themselves. After each change I reboot both routers, just to be absolutely sure.

what I spotted : as far as there are data flowing over the L2TP tunnel, THERE ARE ABSOLUTELY NO DISCONNECTIONS AT ALL. I sent 10.000 pings over the tunnel so that is about three hours - just about 9 dropped (fantastic result over 3g GSM connection !) and the tunnel did not drop at all. Not a single time.

IF THERE IS NO TRAFFIC AT ALL, THE TUNNEL DROPS EXACTLY AS YOURS with the same symptoms in log - drops about 5 to 10 times in a hour.

I also tried to change udp-timeout, udp-stream-timeout and generic timeout in /ip firewall connection tracking, changed those to 30 minutes intentionally - nothing changed. If no data are passed through L2TP tunnel, it drops about 5-10 times a hour so I returned those settings back to their original values.

Because these routers are located on the same table for testing purposes, I connected them by ethernet cross-cable. Will write shortly if the behavior changed...

mp3turbo · Sun Oct 16, 2011 1:57 pm

In about two hours, there was NO SINGLE drop-out when I connected those two routers via ethernet. There would be many disconnections already via 3G connection.

Go figure... I just don't know.

There are really no drop-outs on 3G connection I'm using, 10 pings out of 10000, /interface ppp-client shows uptime corresponding with time I power it on. So there are really no outages on the side of 3G, but still when L2TP is done over 3G connection, it drops out.

It doesn't when done via ethernet.

The only thing I changed on side of client is /interface l2tp-client "connect-to" parameter so it didn't use public IP of L2TP-server but private IP accessible over ethernet cable.

changeip · Mon Oct 17, 2011 7:39 pm

its simply your hardware or cell carrier putting the connection to sleep. they do this all the time to keep traffic down on their network - you probably have no control over it on your end. Cell networks are not made for 100% uptime and therefore they will flush your connection if its not being used.

omega-00 · Mon Oct 17, 2011 8:21 pm

Try adding a netwatch to the connection just to generate a continuous small amount of traffic and see if it stays Online?

mp3turbo · Fri Nov 25, 2011 11:13 pm

my apologies for not replying for a month - changeip is right, there has to be something with the 3G connection. No other explanation here...

I tried to implement a script to ping L2TP server from every L2TP client. I played around with frequency and length of pings, but achieved nothing worth speaking about, disconnections are still there. I feel they are less frequent but I don't have any statistical analysis available as I didn't dedicate so much time to it. At the end, I tried to start a script to ping L2TP Server each minute with one ping but that didn't help. We also changed and tested several different models of USB modems, we tried some 3G routers, nothing helped.

Application alone is running without any visible issues as it uses bottom-to-top approach (clients are connecting to server to find out new data, there is nothing being pushed from server to clients). If the tunel is dropped actually at the moment when application tries to get updates, there is about three to five seconds delay as the 3G connection is brought to live and L2TP tunnel established again.

Of course, TCP/IP can withstand such delay without any issues. For sure with UDP it would be much worse.

Sorry, no real solution here.

l2tp reconnects every few minutes.

l2tp reconnects every few minutes.

Re: l2tp reconnects every few minutes.

Re: l2tp reconnects every few minutes.

Re: l2tp reconnects every few minutes.

Re: l2tp reconnects every few minutes.

Re: l2tp reconnects every few minutes.

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