ppp TunnelStats: LCP_UNKNOWN_OPTIONS 1,LCP_PROTO_REJ 1,FSM_UNEXPECTED_DOWN 1,

Hello,

We have similar issues in our logs : 

Oct 11 08:59:47 f5.fqdn.lan notice tmm1[19810]: 014905d4:5: /VPN/APM_VPN_prod:VPN:de8c7754:c212b9aa: TunnelStats: LCP_UNKNOWN_OPTIONS 1,LCP_LINK_FAILURES 1,LCP_PROTO_REJ 1,FSM_UNEXPECTED_DOWN 1,
Oct 11 08:59:47 f5.fqdn.lan notice tmm1[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4000f4a0e100 (ID: c212b9aa) closed.
Oct 11 09:24:03 f5.fqdn.lan notice tmm1[19810]: 01490549:5: /VPN/APM_VPN_prod:VPN:de8c7754: Assigned PPP Dynamic IPv4: AA.BB.CC.131 ID: a95de0ef Tunnel Type: VPN_TUNNELTYPE_TLS NA Resource: /VPN/NA_VPN_prod Client IP: XX.YY.NN.MM - Reconnect
Oct 11 09:24:03 f5.fqdn.lan notice tmm1[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4000f4a6f100 (ID: a95de0ef) started.
Oct 11 09:25:23 f5.fqdn.lan notice tmm1[19810]: 014905d4:5: /VPN/APM_VPN_prod:VPN:de8c7754:a95de0ef: TunnelStats: LCP_UNKNOWN_OPTIONS 1,LCP_PROTO_REJ 1,
Oct 11 09:25:23 f5.fqdn.lan notice tmm1[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4000f4a6f100 (ID: a95de0ef) closed.
Oct 11 09:25:30 f5.fqdn.lan notice tmm3[19810]: 01490549:5: /VPN/APM_VPN_prod:VPN:de8c7754: Assigned PPP Dynamic IPv4: AA.BB.CC.131 ID: 29d312b1 Tunnel Type: VPN_TUNNELTYPE_TLS NA Resource: /VPN/NA_VPN_prod Client IP: XX.YY.NN.MM - Reconnect
Oct 11 09:25:30 f5.fqdn.lan notice tmm3[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4002de164a00 (ID: 29d312b1) started.
Oct 11 09:43:21 f5.fqdn.lan notice tmm3[19810]: 01490549:5: /VPN/APM_VPN_prod:VPN:de8c7754: Assigned PPP Dynamic IPv4: AA.BB.CC.131 ID: 0ed76c9c Tunnel Type: VPN_TUNNELTYPE_TLS NA Resource: /VPN/NA_VPN_prod Client IP: XX.YY.NN.MM - Reconnect
Oct 11 09:43:21 f5.fqdn.lan notice tmm3[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4002a3ac2600 (ID: 0ed76c9c) started.
Oct 11 09:43:21 f5.fqdn.lan notice tmm3[19810]: 014905d4:5: /VPN/APM_VPN_prod:VPN:de8c7754:29d312b1: TunnelStats: PPP_LISTENER_ERRORS 439,LCP_PROTO_REJ 1,
Oct 11 09:43:21 f5.fqdn.lan notice tmm3[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4002de164a00 (ID: 29d312b1) closed.
Oct 11 09:43:46 f5.fqdn.lan notice tmm3[19810]: 014905d4:5: /VPN/APM_VPN_prod:VPN:de8c7754:0ed76c9c: TunnelStats: PPP_LISTENER_ERRORS 873,LCP_PROTO_REJ 1,
Oct 11 09:43:46 f5.fqdn.lan notice tmm3[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4002a3ac2600 (ID: 0ed76c9c) closed.
Oct 11 09:43:49 f5.fqdn.lan notice tmm1[19810]: 01490549:5: /VPN/APM_VPN_prod:VPN:de8c7754: Assigned PPP Dynamic IPv4: AA.BB.CC.131 ID: b9b9e6ae Tunnel Type: VPN_TUNNELTYPE_TLS NA Resource: /VPN/NA_VPN_prod Client IP: XX.YY.NN.MM - Reconnect
Oct 11 09:43:49 f5.fqdn.lan notice tmm1[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4000dc97bd00 (ID: b9b9e6ae) started.
Oct 11 12:42:19 f5.fqdn.lan notice tmm1[19810]: 014905d4:5: /VPN/APM_VPN_prod:VPN:de8c7754:b9b9e6ae: TunnelStats: PPP_LISTENER_ERRORS 669,LCP_LINK_FAILURES 1,LCP_PROTO_REJ 1,FSM_UNEXPECTED_DOWN 1,
Oct 11 12:42:19 f5.fqdn.lan notice tmm1[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4000dc97bd00 (ID: b9b9e6ae) closed.
Oct 11 12:42:20 f5.fqdn.lan notice tmm[19810]: 01490549:5: /VPN/APM_VPN_prod:VPN:de8c7754: Assigned PPP Dynamic IPv4: AA.BB.CC.131 ID: 08e1a9f1 Tunnel Type: VPN_TUNNELTYPE_TLS NA Resource: /VPN/NA_VPN_prod Client IP: XX.YY.NN.MM - Reconnect
Oct 11 12:42:20 f5.fqdn.lan notice tmm[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x400001abbd00 (ID: 08e1a9f1) started.
Oct 11 12:46:50 f5.fqdn.lan notice tmm[19810]: 014905d4:5: /VPN/APM_VPN_prod:VPN:de8c7754:08e1a9f1: TunnelStats: PPP_LISTENER_ERRORS 3,LCP_LINK_FAILURES 1,LCP_PROTO_REJ 1,FSM_UNEXPECTED_DOWN 1,
Oct 11 12:46:50 f5.fqdn.lan notice tmm[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x400001abbd00 (ID: 08e1a9f1) closed.
Oct 11 13:09:02 f5.fqdn.lan notice tmm3[19810]: 01490549:5: /VPN/APM_VPN_prod:VPN:de8c7754: Assigned PPP Dynamic IPv4: AA.BB.CC.131 ID: bf314a7a Tunnel Type: VPN_TUNNELTYPE_TLS NA Resource: /VPN/NA_VPN_prod Client IP: XX.YY.NN.MM - Reconnect
Oct 11 13:09:02 f5.fqdn.lan notice tmm3[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x40028a507700 (ID: bf314a7a) started.
Oct 11 13:14:05 f5.fqdn.lan notice tmm3[19810]: 014905d4:5: /VPN/APM_VPN_prod:VPN:de8c7754:bf314a7a: TunnelStats: PPP_LISTENER_ERRORS 201,PPP_F5_FRAMING_ERRORS 15,LCP_LINK_FAILURES 1,LCP_PROTO_REJ 1,FSM_UNEXPECTED_DOWN 1,FSM_UNEXPECTED_FRAME 1,
Oct 11 13:14:05 f5.fqdn.lan notice tmm3[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x40028a507700 (ID: bf314a7a) closed.
Oct 11 13:50:56 f5.fqdn.lan notice tmm2[19810]: 01490549:5: /VPN/APM_VPN_prod:VPN:de8c7754: Assigned PPP Dynamic IPv4: AA.BB.CC.131 ID: 114c01a6 Tunnel Type: VPN_TUNNELTYPE_TLS NA Resource: /VPN/NA_VPN_prod Client IP: XX.YY.NN.MM - Reconnect
Oct 11 13:50:56 f5.fqdn.lan notice tmm2[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4001b36f2d00 (ID: 114c01a6) started.
Oct 11 14:46:59 f5.fqdn.lan notice tmm2[19810]: 014905d4:5: /VPN/APM_VPN_prod:VPN:de8c7754:114c01a6: TunnelStats: PPP_LISTENER_ERRORS 116,PPP_F5_FRAMING_ERRORS 26,LCP_LINK_FAILURES 1,LCP_PROTO_REJ 1,FSM_UNEXPECTED_DOWN 1,FSM_UNEXPECTED_FRAME 1,
Oct 11 14:46:59 f5.fqdn.lan notice tmm2[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4001b36f2d00 (ID: 114c01a6) closed.
Oct 11 14:47:00 f5.fqdn.lan notice tmm2[19810]: 01490549:5: /VPN/APM_VPN_prod:VPN:de8c7754: Assigned PPP Dynamic IPv4: AA.BB.CC.131 ID: 0394d90a Tunnel Type: VPN_TUNNELTYPE_TLS NA Resource: /VPN/NA_VPN_prod Client IP: XX.YY.NN.MM - Reconnect
Oct 11 14:47:00 f5.fqdn.lan notice tmm2[19810]: 01490505:5: /VPN/APM_VPN_prod:VPN:de8c7754: PPP tunnel 0x4001b369bf00 (ID: 0394d90a) started.

Do you know what these errors could mean ? 

Thank you

Thomas