L2TP unstable on Dual WAN load-balancing configuration

[Petric]

Hi there,
I use the last 378.55 firmware by Merlin on Asus RT-AC66U.
In the case I setup a load-balancing config for 2 ISP:
- ISP1 - Automatic IP
- ISP2 - L2TP
The config works well by time to time router losts L2TP connections and cant get BRAS.. On the log it looks like
-----
Sep 25 10:24:15 /usr/sbin/l2tpd[1095]: tunnel_establish: gethostbyname failed for 'tp.internet.beeline.ru'
Sep 25 10:24:25 /usr/sbin/l2tpd[1095]: tunnel_establish: gethostbyname failed for 'tp.internet.beeline.ru'
Sep 25 10:24:35 /usr/sbin/l2tpd[1095]: tunnel_establish: gethostbyname failed for 'tp.internet.beeline.ru'
Sep 25 10:24:45 /usr/sbin/l2tpd[1095]: tunnel_establish: gethostbyname failed for 'tp.internet.beeline.ru
-----
I reload router in the case and L2TP works well for 3-6 hours..
Do you have any ideas how can I get more info why this happens?

 

[Petric]

Sep 27 13:35:30 pppd[1185]: Plugin pppol2tp.so loaded.
Sep 27 13:35:30 pppd[1185]: pppd 2.4.7 started by xxxxxxxx, uid 0
Sep 27 13:35:30 pppd[1185]: Using interface ppp1
Sep 27 13:35:30 pppd[1185]: Connect: ppp1 <--> l2tp (85.21.0.245)
Sep 27 13:35:30 pppd[1185]: CHAP authentication failed: Too many connections
Sep 27 13:35:30 pppd[1185]: CHAP authentication failed
Sep 27 13:35:30 pppd[1185]: Connection terminated.
Sep 27 13:35:30 pppd[1185]: Exit.
Sep 27 13:35:40 pppd[1200]: Plugin pppol2tp.so loaded.
Sep 27 13:35:40 pppd[1200]: pppd 2.4.7 started by xxxxxxx, uid 0
Sep 27 13:35:40 pppd[1200]: Using interface ppp1
Sep 27 13:35:40 pppd[1200]: Connect: ppp1 <--> l2tp (85.21.0.245)
Sep 27 13:35:40 pppd[1200]: CHAP authentication failed: Too many connections
Sep 27 13:35:40 pppd[1200]: CHAP authentication failed
Sep 27 13:35:40 pppd[1200]: Connection terminated.
Sep 27 13:35:40 pppd[1200]: Exit.
Sep 27 13:35:49 crond[296]: time disparity of 387994 minutes detected
Sep 27 13:35:50 /usr/sbin/l2tpd[412]: tunnel_establish: gethostbyname failed for 'tp.internet.beeline.ru'
Sep 27 13:36:00 /usr/sbin/l2tpd[412]: tunnel_establish: gethostbyname failed for 'tp.internet.beeline.ru'
Sep 27 13:36:10 /usr/sbin/l2tpd[412]: tunnel_establish: gethostbyname failed for 'tp.internet.beeline.ru'
Sep 27 13:36:20 /usr/sbin/l2tpd[412]: tunnel_establish: gethostbyname failed for 'tp.internet.beeline.ru'
Sep 27 13:36:30 /usr/sbin/l2tpd[412]: tunnel_establish: gethostbyname failed for 'tp.internet.beeline.ru'

 

[RMerlin]

To Hell with Beeline's brain-dead architecture, quite frankly. Dealing with them has been a huge waste of time and resources.

My guess is their twisted VPN+DHCP architecture simply doesn't work with a dual wan setup, so there's nothing you can do about it.

 

[Petric]

Merlin,
Thnx for update.. I can move Beeline to DHCP as they started to work without VPN auth...
Could you help me with recommendations how to troubleshooting dual WAN?

 

[Petric]

Merlin,
I'd much appreciate your feedback about this idea
http://simonmott.co.uk/vpn-bonding
Will it work in case of dual WAN with static IP (DHCP with real IP)? I can buy VPS in AWS for example..
The reason why I asked.. I see permanent changing bandwidth on DownLink and UpLink for both ISP.