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One of 30 working l2tp/ipsec tunnels suddenly stops !

Posted: Thu Mar 07, 2019 5:03 pm
by ik3umt
30 working l2tp/ipsec tunnels into a RB3011 server
One of them suddenly stops working:
client (a 3011 too) starts and complete phase1 and phase2 (a pair SA installed on both machines) , then it sends control message (three times) to server but this one doesn't receive anything.
Then, client drops the whole connection due to "tunnel xx received no replies, disconnecting"
Only the client side SA with Src.Address <local> and Dst.Address <remote> increases its "Current Bytes" counter (due to starting l2tp session) all other SA have no traffic.

No changes are made on both machines.
Server firewall filter uses the same rules for all clients (that are working) no incoming packets from client are dropped.
Rebooted routerboard and ISP router on both sides, no way.
Both RB are 6.44
Both have public ip address on their WANs

Any suggestion please ?

Re: One of 30 working l2tp/ipsec tunnels suddenly stops !

Posted: Fri Mar 22, 2019 9:26 am
by ik3umt
For ones who are experiencing such an issue...

It seems related to ISP router, the problem disappeared once ISP router was rebooted.

Despite both MT wan have a public IP address, the connection is not so "transparent" as it should expected to be.....

It would be nice to know where ip packets are lost in data exchange.

Anyone experienced ?