** Description changed:

  My connection works in 20.04 and fails in 22.04.  Perhaps something i've
  been using is now depricated?  Or perhaps jammy xl2tpd is...still
  working on it?
  
  see my attached syslog extracts at comments #6 and #7.  i extracted them
  thus:
  
  egrep -i "l2tp|swan|ipsec|charon|XFRM|layer 2|\<ike"
  /var/log/syslog|egrep -v "INFORMATIONAL_V1|packet: from"
  
  what seems to stand out is:
  
  These lines show up in syslog only in 20.04:
  Nov 22 06:22:04 e540 ipsec[782]: 12[KNL] 3.i.p.4 appeared on ppp0
  Nov 22 06:22:04 e540 ipsec[782]: 14[KNL] 3.i.p.4 disappeared from ppp0
  Nov 22 06:22:04 e540 ipsec[782]: 09[KNL] 3.i.p.4 appeared on ppp0
  Nov 22 06:22:04 e540 ipsec[782]: 05[KNL] interface ppp0 activated
  
  These lines show up in syslog only in jammy:
  Nov 24 20:11:45 e540 xl2tpd[983]: Can not find tunnel 105 (refhim=0)
  Nov 24 20:11:45 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 105 Dumping.
  Nov 24 20:11:46 e540 xl2tpd[983]: Can not find tunnel 12 (refhim=0)
  Nov 24 20:11:46 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 12 Dumping.
  Nov 24 20:11:46 e540 xl2tpd[983]: Can not find tunnel 105 (refhim=0)
  Nov 24 20:11:46 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 105 Dumping.
  Nov 24 20:11:48 e540 xl2tpd[983]: Can not find tunnel 12 (refhim=0)
  Nov 24 20:11:48 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 12 Dumping.
  Nov 24 20:11:48 e540 xl2tpd[983]: Can not find tunnel 105 (refhim=0)
  Nov 24 20:11:48 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 105 Dumping.
  Nov 24 20:11:52 e540 xl2tpd[983]: Can not find tunnel 12 (refhim=0)
  Nov 24 20:11:52 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 12 Dumping.
  Nov 24 20:11:52 e540 xl2tpd[983]: Can not find tunnel 105 (refhim=0)
  Nov 24 20:11:52 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 105 Dumping.
  Nov 24 20:12:00 e540 xl2tpd[983]: Can not find tunnel 12 (refhim=0)
  Nov 24 20:12:00 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 12 Dumping.
  Nov 24 20:12:00 e540 xl2tpd[983]: Can not find tunnel 105 (refhim=0)
  Nov 24 20:12:00 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 105 Dumping.
  Nov 24 20:12:16 e540 xl2tpd[983]: Maximum retries exceeded for tunnel 39202.  
Closing.
  Nov 24 20:12:16 e540 xl2tpd[983]: Connection 0 closed to 2.i.p.7, port 1701 
(Timeout)
  Nov 24 20:12:16 e540 xl2tpd[983]: Can not find tunnel 45 (refhim=0)
  Nov 24 20:12:16 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 45 Dumping.
  Nov 24 20:12:17 e540 xl2tpd[983]: Can not find tunnel 45 (refhim=0)
  Nov 24 20:12:17 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 45 Dumping.
  Nov 24 20:12:19 e540 xl2tpd[983]: Can not find tunnel 45 (refhim=0)
  Nov 24 20:12:19 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 45 Dumping.
  Nov 24 20:12:23 e540 xl2tpd[983]: Can not find tunnel 45 (refhim=0)
  Nov 24 20:12:23 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 45 Dumping.
  Nov 24 20:12:31 e540 xl2tpd[983]: Can not find tunnel 45 (refhim=0)
  Nov 24 20:12:31 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 45 Dumping.
  Nov 24 20:12:47 e540 xl2tpd[983]: Unable to deliver closing message for 
tunnel 39202. Destroying anyway.
  
  my /etc/ipsec.conf:
+ config setup
+ 
+ conn %default
+   ikelifetime=60m
+   keylife=20m
+   rekeymargin=3m
+   keyingtries=1
+   keyexchange=ikev1
+   authby=secret
+   ike=aes256-sha1-modp2048!
+   esp=aes-sha1!
+ 
  conn myvp7
    right=2.i.p.7
    rightprotoport=17/1701
    leftprotoport=17/1701
    left=%defaultroute
    keyexchange=ikev1
    type=transport
    authby=secret
    auto=add
  
  my /etc/ipsec.secrets:
  : PSK ...
  
  my /etc/xl2tpd/xl2tpd.conf:
  [lac myvp7]
  lns = 2.i.p.7
  ppp debug = yes
  pppoptfile = /etc/ppp/options.l2tpd.client
  length bit = yes
  
  my /etc/ppp/options.l2tpd.client:
  ipcp-accept-local
  ipcp-accept-remote
  refuse-eap
  require-chap
  noccp
  noauth
  mtu 1280
  mru 1280
  noipdefault
  defaultroute
  usepeerdns
  connect-delay 5000
  
  name ...
  password ...
  
  my startup commands:
  ipsec up myvp7&&
  echo>/var/run/xl2tpd/l2tp-control c myvp7&&
  while i=$(ip route) j=${i#*3.i.p.}
     [[ $j = "$i" ]]
  do echo -n .;sleep .3
  done
  i="ip route add 192.168.128.0/21 via 192.168.128.${j%% *}"
  echo $i;$i
+ 
+ er-x /etc/ipsec.conf:
+ config setup
+ 
+ conn %default
+         keyexchange=ikev1
+ 
+ conn remote-access
+   authby=secret
+   type=transport
+   keyexchange=ikev1
+   left=2.i.p.7
+ 
+   leftprotoport=17/1701
+   right=%any
+   rightprotoport=17/%any
+   auto=add
+   dpddelay=15
+   dpdtimeout=45
+   dpdaction=clear
+   rekey=no
+   ikelifetime=3600
+   keylife=3600
+ 
+ er-x /etc/ipsec.secrets:
+ 2.i.p.7 %any : PSK ...
+ 
+ er-x /etc/xl2tpd/xl2tpd.conf:
+ [global]
+ listen-addr = 2.i.p.7
+ 
+ [lns default]
+ ip range = 3.i.p.4-3.i.p.9
+ local ip = 10.255.255.0
+ refuse pap = yes
+ require authentication = yes
+ name = VyattaL2TPServer
+ ppp debug = yes
+ pppoptfile = /etc/ppp/options.xl2tpd
+ length bit = yes
+ 
+ er-x /etc/ppp/options.xl2tpd:
+ name xl2tpd
+ linkname l2tp
+ ipcp-accept-local
+ ipcp-accept-remote
+ ms-dns 8.8.8.8
+ ms-dns 8.8.4.4
+ noccp
+ auth
+ nodefaultroute
+ debug
+ proxyarp
+ connect-delay 5000
+ idle 1800

** Description changed:

  My connection works in 20.04 and fails in 22.04.  Perhaps something i've
  been using is now depricated?  Or perhaps jammy xl2tpd is...still
  working on it?
  
  see my attached syslog extracts at comments #6 and #7.  i extracted them
  thus:
  
  egrep -i "l2tp|swan|ipsec|charon|XFRM|layer 2|\<ike"
  /var/log/syslog|egrep -v "INFORMATIONAL_V1|packet: from"
  
  what seems to stand out is:
  
  These lines show up in syslog only in 20.04:
  Nov 22 06:22:04 e540 ipsec[782]: 12[KNL] 3.i.p.4 appeared on ppp0
  Nov 22 06:22:04 e540 ipsec[782]: 14[KNL] 3.i.p.4 disappeared from ppp0
  Nov 22 06:22:04 e540 ipsec[782]: 09[KNL] 3.i.p.4 appeared on ppp0
  Nov 22 06:22:04 e540 ipsec[782]: 05[KNL] interface ppp0 activated
  
  These lines show up in syslog only in jammy:
  Nov 24 20:11:45 e540 xl2tpd[983]: Can not find tunnel 105 (refhim=0)
  Nov 24 20:11:45 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 105 Dumping.
  Nov 24 20:11:46 e540 xl2tpd[983]: Can not find tunnel 12 (refhim=0)
  Nov 24 20:11:46 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 12 Dumping.
  Nov 24 20:11:46 e540 xl2tpd[983]: Can not find tunnel 105 (refhim=0)
  Nov 24 20:11:46 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 105 Dumping.
  Nov 24 20:11:48 e540 xl2tpd[983]: Can not find tunnel 12 (refhim=0)
  Nov 24 20:11:48 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 12 Dumping.
  Nov 24 20:11:48 e540 xl2tpd[983]: Can not find tunnel 105 (refhim=0)
  Nov 24 20:11:48 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 105 Dumping.
  Nov 24 20:11:52 e540 xl2tpd[983]: Can not find tunnel 12 (refhim=0)
  Nov 24 20:11:52 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 12 Dumping.
  Nov 24 20:11:52 e540 xl2tpd[983]: Can not find tunnel 105 (refhim=0)
  Nov 24 20:11:52 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 105 Dumping.
  Nov 24 20:12:00 e540 xl2tpd[983]: Can not find tunnel 12 (refhim=0)
  Nov 24 20:12:00 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 12 Dumping.
  Nov 24 20:12:00 e540 xl2tpd[983]: Can not find tunnel 105 (refhim=0)
  Nov 24 20:12:00 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 105 Dumping.
  Nov 24 20:12:16 e540 xl2tpd[983]: Maximum retries exceeded for tunnel 39202.  
Closing.
  Nov 24 20:12:16 e540 xl2tpd[983]: Connection 0 closed to 2.i.p.7, port 1701 
(Timeout)
  Nov 24 20:12:16 e540 xl2tpd[983]: Can not find tunnel 45 (refhim=0)
  Nov 24 20:12:16 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 45 Dumping.
  Nov 24 20:12:17 e540 xl2tpd[983]: Can not find tunnel 45 (refhim=0)
  Nov 24 20:12:17 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 45 Dumping.
  Nov 24 20:12:19 e540 xl2tpd[983]: Can not find tunnel 45 (refhim=0)
  Nov 24 20:12:19 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 45 Dumping.
  Nov 24 20:12:23 e540 xl2tpd[983]: Can not find tunnel 45 (refhim=0)
  Nov 24 20:12:23 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 45 Dumping.
  Nov 24 20:12:31 e540 xl2tpd[983]: Can not find tunnel 45 (refhim=0)
  Nov 24 20:12:31 e540 xl2tpd[983]: network_thread: unable to find call or 
tunnel to handle packet.  call = 39202, tunnel = 45 Dumping.
  Nov 24 20:12:47 e540 xl2tpd[983]: Unable to deliver closing message for 
tunnel 39202. Destroying anyway.
  
  my /etc/ipsec.conf:
  config setup
  
  conn %default
-   ikelifetime=60m
-   keylife=20m
-   rekeymargin=3m
-   keyingtries=1
-   keyexchange=ikev1
-   authby=secret
-   ike=aes256-sha1-modp2048!
-   esp=aes-sha1!
+   ikelifetime=60m
+   keylife=20m
+   rekeymargin=3m
+   keyingtries=1
+   keyexchange=ikev1
+   authby=secret
+   ike=aes256-sha1-modp2048!
+   esp=aes-sha1!
  
  conn myvp7
    right=2.i.p.7
    rightprotoport=17/1701
    leftprotoport=17/1701
    left=%defaultroute
    keyexchange=ikev1
    type=transport
    authby=secret
    auto=add
  
  my /etc/ipsec.secrets:
  : PSK ...
  
  my /etc/xl2tpd/xl2tpd.conf:
  [lac myvp7]
  lns = 2.i.p.7
  ppp debug = yes
  pppoptfile = /etc/ppp/options.l2tpd.client
  length bit = yes
  
  my /etc/ppp/options.l2tpd.client:
  ipcp-accept-local
  ipcp-accept-remote
  refuse-eap
  require-chap
  noccp
  noauth
  mtu 1280
  mru 1280
  noipdefault
  defaultroute
  usepeerdns
  connect-delay 5000
  
  name ...
  password ...
  
  my startup commands:
  ipsec up myvp7&&
  echo>/var/run/xl2tpd/l2tp-control c myvp7&&
  while i=$(ip route) j=${i#*3.i.p.}
     [[ $j = "$i" ]]
  do echo -n .;sleep .3
  done
- i="ip route add 192.168.128.0/21 via 192.168.128.${j%% *}"
+ i="ip route add 3.i.p.0/21 via 3.i.p.${j%% *}"
  echo $i;$i
  
  er-x /etc/ipsec.conf:
  config setup
  
  conn %default
-         keyexchange=ikev1
+         keyexchange=ikev1
  
  conn remote-access
-   authby=secret
-   type=transport
-   keyexchange=ikev1
-   left=2.i.p.7
+   authby=secret
+   type=transport
+   keyexchange=ikev1
+   left=2.i.p.7
  
-   leftprotoport=17/1701
-   right=%any
-   rightprotoport=17/%any
-   auto=add
-   dpddelay=15
-   dpdtimeout=45
-   dpdaction=clear
-   rekey=no
-   ikelifetime=3600
-   keylife=3600
+   leftprotoport=17/1701
+   right=%any
+   rightprotoport=17/%any
+   auto=add
+   dpddelay=15
+   dpdtimeout=45
+   dpdaction=clear
+   rekey=no
+   ikelifetime=3600
+   keylife=3600
  
  er-x /etc/ipsec.secrets:
  2.i.p.7 %any : PSK ...
  
  er-x /etc/xl2tpd/xl2tpd.conf:
  [global]
  listen-addr = 2.i.p.7
  
  [lns default]
  ip range = 3.i.p.4-3.i.p.9
  local ip = 10.255.255.0
  refuse pap = yes
  require authentication = yes
  name = VyattaL2TPServer
  ppp debug = yes
  pppoptfile = /etc/ppp/options.xl2tpd
  length bit = yes
  
  er-x /etc/ppp/options.xl2tpd:
  name xl2tpd
  linkname l2tp
  ipcp-accept-local
  ipcp-accept-remote
  ms-dns 8.8.8.8
  ms-dns 8.8.4.4
  noccp
  auth
  nodefaultroute
  debug
  proxyarp
  connect-delay 5000
  idle 1800

** Attachment added: "er-x charon.log when 20.04 connects"
   
https://bugs.launchpad.net/ubuntu/+source/xl2tpd/+bug/1951832/+attachment/5543179/+files/fcha

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https://bugs.launchpad.net/bugs/1951832

Title:
  xl2tpd "Can not find tunnel" in jammy

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