[c-nsp] Cisco L2TP Failed

Olivier CALVANO o.calvano at gmail.com
Fri Sep 10 08:41:58 EDT 2021


I'm looking for a little bit of help on an L2TP error.

I have a cisco 881 router which needs to make an L2TP connection, the conf:

l2tp-class PW
     hostname C881

pseudowire-class L2TP
  l2tpv2 encapsulation
  protocol l2tpv2 PW
  local ip interface FastEthernet4

FastEthernet4 interface
  ip address dhcp
  auto duplex
  auto speed

Virtual-PPP1 interface
  ip address negotiated
  no ip redirects
  no ip unreachables
  no ip proxy-arp
  ip mtu 1300
  ip verify unicast reverse-path
  ip tcp adjust-mss 1200
  load-interval 30
  no cdp enable
  ppp chap hostname mylogin @ realm
  ppp chap password 0 xxx
  ppp ipcp dns request
  ppp ipcp route default
  pseudowire 10.10.10.1 1 l2tpv2 pw-class L2TP encapsulation

ip route 0.0.0.0 0.0.0.0 Virtual-PPP1
ip route 10.10.10.1 255.255.255.255 FastEthernet4 dhcp




In debug L2TP all i have:



*Sep 10 05:00:46.359: L2TP app   _____:00001004:XCON: APP->L2TP: activate,
*Sep 10 05:00:46.359: L2TP app   _____:00001004:XCON:            client
00001004
*Sep 10 05:00:46.359: L2TP app   _____:00001004:XCON:            app
XCONNECT
*Sep 10 05:00:46.359: L2TP app   _____:00001004:XCON:
*Sep 10 05:00:46.359: L2TP       _____:________: Find cc between
*Sep 10 05:00:46.359: L2TP       _____:________:
10.153.60.172<->10.10.10.1
*Sep 10 05:00:46.359: L2TP       _____:________:   with class: PW
*Sep 10 05:00:46.359: L2TP       _____:________:   and IP proto: L2TPoUDP
*Sep 10 05:00:46.359: L2TP       _____:________:   and framing type: none
*Sep 10 05:00:46.359: L2TP       _____:________:   and bearer type: none
*Sep 10 05:00:46.359: L2TP       _____:________:   and version: V2
*Sep 10 05:00:46.359: L2TP       _____:________:   and local hostname: C881
*Sep 10 05:00:46.359: L2TP       _____:________: Need to instigate control
channel
*Sep 10 05:00:46.359: L2X  tnl   08706:________: Create logical tunnel
*Sep 10 05:00:46.359: L2TP tnl   08706:________: Create tunnel
*Sep 10 05:00:46.359: L2TP tnl   08706:________:     version set to V2
*Sep 10 05:00:46.359: L2TP tnl   08706:________:     remote ip set
to 10.10.10.1
*Sep 10 05:00:46.359: L2TP tnl   08706:________:     local ip set to
10.153.60.172
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B:     class name PW
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B:     class name PW
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B: FSM-CC ev App-Conn
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B: FSM-CC    Idle->Wt-Sock
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B: FSM-CC do App-Connect-Sock
*Sep 10 05:00:46.359: L2TP app   08706:00001004:XCON: Created
*Sep 10 05:00:46.359: L2TP app   08706:00001004:XCON:   App count now 1
*Sep 10 05:00:46.359: L2X        _____:________: l2x_open_socket: is called
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B: Open sock
10.153.60.172:1701-> 10.10.10.1  :1701
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B: FSM-CC ev Sock-Ready
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B: FSM-CC    Wt-Sock->Wt-SCCRP
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B: FSM-CC do Tx-SCCRQ
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B:
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B: O SCCRQ to 10.10.10.1
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B:  IETF v2:
*Sep 10 05:00:46.359: L2TP tnl   08706:0000055B:   Protocol Version  1,
Revision 0
*Sep 10 05:00:46.363: L2TP tnl   08706:0000055B:   Framing Cap
none(0x0)
*Sep 10 05:00:46.363: L2TP tnl   08706:0000055B:   Tie Breaker
*Sep 10 05:00:46.363: L2TP tnl   08706:0000055B:     6097E495022261A9
*Sep 10 05:00:46.363: L2TP tnl   08706:0000055B:   Firmware Ver      0x1130
*Sep 10 05:00:46.363: L2TP tnl   08706:0000055B:   Hostname           "C881"
*Sep 10 05:00:46.363: L2TP tnl   08706:0000055B:   Vendor Name
*Sep 10 05:00:46.363: L2TP tnl   08706:0000055B:      "Cisco Systems, Inc."
*Sep 10 05:00:46.363: L2TP tnl   08706:0000055B:   Assigned Tunnel I
0x0000055B (1371)
*Sep 10 05:00:46.363: L2TP tnl   08706:0000055B:   Recv Window Size  512
*Sep 10 05:00:46.363: L2TP tnl   08706:0000055B:
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: StopCCN: skip authen, no
nonce yet
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: Drain unsentQ, cur/max
resendQ sz 0/4, unsentQ 0
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: I StopCCN, flg TLS, ver 2,
len 36
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:  IETF v2:
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:   Result Code
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:     Requester is not
authorized to establish a control channel(4)
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:     Error code
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:       No error(0)
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:   Assigned Tunnel I
0x0000FFFF (65535)
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: O ZLB ACK to
10.10.10.1   tnl 65535
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: FSM-CC ev Rx-StopCCN
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: FSM-CC    in Wt-SCCRP
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: FSM-CC do Rx-StopCCN
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: Shutting down tunnel
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:   With 1 app
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:   Result Code
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:     Requester is not
authorized to establish a control channel
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:   Error Code
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:     No error
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:   Vendor Error
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:     None
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B:
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: FSM-CC ev Shut-Now
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: FSM-CC
 Wt-SCCRP->Wt-STOPACK
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: FSM-CC do Shutnow-Error
*Sep 10 05:00:46.723: L2TP tnl   08706:0000055B: Notify 1 app cc, FAILED
*Sep 10 05:00:46.723: L2TP app   08706:00001004:XCON:
*Sep 10 05:00:46.723: L2TP app   08706:00001004:XCON: APP<-L2TP: notify cc,
*Sep 10 05:00:46.723: L2TP app   08706:00001004:XCON:            client
00001004
*Sep 10 05:00:46.723: L2TP app   08706:00001004:XCON:            app
XCONNECT
*Sep 10 05:00:46.723: L2TP app   08706:00001004:XCON:            FAILED
*Sep 10 05:00:46.727: L2TP app   08706:00001004:XCON:
*Sep 10 05:00:46.727: L2TP       _____:________: L2TUN: app XCONNECT cc
status
*Sep 10 05:00:46.727: L2TP tnl   08706:0000055B: FSM-CC ev App-Disc
*Sep 10 05:00:46.727: L2TP tnl   08706:0000055B: FSM-CC    in Wt-STOPACK
*Sep 10 05:00:46.727: L2TP tnl   08706:0000055B: FSM-CC do App-Disc-Shut
*Sep 10 05:00:46.727: L2TP app   08706:00001004:XCON: Destroyed
*Sep 10 05:00:46.727: L2TP app   08706:00001004:XCON:   App count now 0
*Sep 10 05:00:46.727: L2TP tnl   08706:0000055B: FSM-CC ev Shut-Comp
*Sep 10 05:00:46.727: L2TP tnl   08706:0000055B: FSM-CC    Wt-STOPACK->Dead
*Sep 10 05:00:46.727: L2TP tnl   08706:0000055B: FSM-CC do
Shutdown-Completed
*Sep 10 05:00:46.727: L2TP tnl   08706:0000055B: Control channel down
*Sep 10 05:00:46.727: L2TP tnl   08706:0000055B:
10.153.60.172<->10.10.10.1
*Sep 10 05:00:46.727: L2TP tnl   08706:0000055B: Destroying tunnel
*Sep 10 05:00:46.727: L2TP: Removing per-cc stats db entry, tun-id 1371
*Sep 10 05:00:46.727: L2X  tnl   08706:________: Destroying logical tunnel
*Sep 10 05:00:46.727: L2X        _____:________:
*Sep 10 05:00:46.727: L2X        _____:________: APP->L2TP: Disconnect [10],
*Sep 10 05:00:46.727: L2X        _____:________:            sock 00001005
*Sep 10 05:00:46.727: L2X        _____:________:            serv 00000000
*Sep 10 05:00:46.727: L2X        _____:________:            replied on same
socket
*Sep 10 05:00:46.727: L2X        _____:________:






I do not know this error "Requester is not authorized to establish a
control channel" anyone have any idea of the problem?

thank you


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