PPPD returns no such device error while establishing XL2TPD over PPPoE

[AnjanaRajan97]

Hi Team,
We are trying to establish an XL2TPD connection between a linux machine and an embedded linux board. The embedded linux board uses Linux Kernel Version 4.19. The Linux Machine is running on Ubuntu 18.04. There is already a PPPoE connection between the Linux Machine and the Board, providing IP to the Board. The idea is to implement XL2TPD over PPPoE. Currently we are running XL2TPD without IPsec support.

1. Versions
   XL2TPD :- 1.3.14
   PPPD :- 2.4.8
   PPPoE :- 3.12

*In both Linux Machine and Board we are running as root

2. Commands used for connecting to LNS from LAC
   sudo xl2tpd -c /etc/xl2tpd/xl2tpd.conf -C /var/run/xl2tpd/l2tp-control
   sudo xl2tpd-control add l2tp lns=
   sudo xl2tpd-control add l2tp local ip=
   sudo xl2tpd-control connect l2tp -------> Username and Password stored in /etc/ppp/chap-secrets

3. Configuration in LNS

• /etc/xl2tpd/xl2tpd.conf
  [global] ; Global parameters:
  port = 1701 ; * Bind to port 1701
  access control = no ; * Refuse connections without IP match
  [lns default] ; Our fallthrough LNS definition
  ip range = 192.168.4.53-192.168.4.60 ; * Allocate from this IP range
  local ip = 192.168.4.52 ; * Our local IP to use
  require chap = yes ; * Require CHAP auth. by peer
  refuse pap = yes ; * Refuse PAP authentication
  name = <user mentioned in /etc/ppp/chap-secrets> ; * Report this as our hostname
  pppoptfile = /etc/ppp/options.xl2tpd ; * ppp options file

• /etc/ppp/options.xl2tpd
  logfd 2
  logfile /tmp/xl2tpd.log
  noccp
  auth
  refuse-eap
  mtu 1410
  mru 1410
  nodefaultroute
  proxyarp
  silent
  debug
  ms-dns 8.8.8.8

• /etc/ppp/options
  persist
  lcp-echo-failure 1
  lcp-echo-interval 30
  +ipv6
  ipv6cp-use-persistent
  mru 1492
  idle 0
  defaultroute
  usepeerdns
  user xxxxxxxx
  mtu 1492
  lock
  debug
  maxauthreq 5

• /etc/ppp/pppoe.conf
  MRU=1492
  USER=xxxxxxxx
  IFNAME='erouter0'
  DEMAND=no
  DNSTYPE=SERVER
  PEERDNS=yes
  DNS1=
  DNS2=
  DEFAULTROUTE=yes
  CONNECT_TIMEOUT=0
  CONNECT_POLL=2
  ACNAME=
  SERVICENAME=
  PING="."
  PIDFILE="/var/run/pppoe.pid"
  SYNCHRONOUS=no
  CLAMPMSS=1412
  LCP_INTERVAL=30
  LCP_FAILURE=3
  PPPOE_TIMEOUT=80
  FIREWALL=NONE
  PPPOE_EXTRA=""
  PPPD_EXTRA="host-uniq e4c0e22464d3"
  ETH='eth0.32'
  LINUX_PLUGIN="/usr/lib/pppd/2.4.8/rp-pppoe.so"

• /etc/ppp/chap-secrets
  Xl2tp_host * mysecretpass *

4. Configuration in LAC

• /etc/xl2tpd/xl2tpd.conf
  [global] ; Global parameters:
  port = 1701 ; * Bind to port 1701
  access control = no ; * Refuse connections without IP match
  [lac Xl2tp_host] ; Another quick LAC
  lns = ; * Required, but can take from default
  require authentication = no
  pppoptfile = /etc/ppp/options.xl2tpd

• /etc/ppp/chap-secrets
  Xl2tp_host * mysecretpass *

5. IPtable Rules added for XL2TPD
   iptables -I INPUT -p udp --dport 1701 -j ACCEPT

6. XL2TPD Logs from LNS
   Listening on IP address 0.0.0.0, port 1701
   Connection established to 172.32.50.1, 1701. Local: 22865, Remote: 62009 (ref=0/0). LNS session is 'default'
   control_finish: Warning: Peer did not specify transmit speed
   Call established with 172.32.50.1, Local: 8, Remote: 7794, Serial: 1
   using channel 17
   Using interface ppp1
   Connect: ppp1 <--> /dev/pts/1
   rcvd [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x816a3a4c>]
   sent [LCP ConfReq id=0x1 <asyncmap 0x0> <magic 0x34d9f77c> ]
   sent [LCP ConfNak id=0x1 ]
   rcvd [LCP ConfReq id=0x2 <asyncmap 0x0> <magic 0x816a3a4c>]
   sent [LCP ConfAck id=0x2 <asyncmap 0x0> <magic 0x816a3a4c>]
   rcvd [LCP ConfAck id=0x1 <asyncmap 0x0> <magic 0x34d9f77c> ]
   ioctl(SIOCSIFMTU): No such device (line 1243)
   sent [LCP EchoReq id=0x0 magic=0x34d9f77c]
   sent [CHAP Challenge id=0x4c <39ad28dd6d86e73670b9ed66936ebfc322603c20>, name = "Xl2tp_host"]
   rcvd [CHAP Challenge id=0x79 , name = "Xl2tp_host"]
   sent [CHAP Response id=0x79 , name = "Xl2tp_host"]
   rcvd [LCP EchoReq id=0x0 magic=0x816a3a4c]
   sent [LCP EchoRep id=0x0 magic=0x34d9f77c]
   rcvd [CHAP Response id=0x4c , name = "Xl2tp_host"]
   sent [CHAP Success id=0x4c "Access granted"]
   rcvd [LCP EchoRep id=0x0 magic=0x816a3a4c]
   rcvd [CHAP Success id=0x79 "Access granted"]
   CHAP authentication succeeded: Access granted
   CHAP authentication succeeded
   sent [IPCP ConfReq id=0x1 <compress VJ 0f 01> <addr 192.168.4.0>]
   rcvd [IPCP ConfReq id=0x1 <addr 0.0.0.0>]
   sent [IPCP ConfRej id=0x1 <addr 0.0.0.0>]
   rcvd [IPCP ConfRej id=0x1 <compress VJ 0f 01>]
   sent [IPCP ConfReq id=0x2 <addr 192.168.4.0>]
   rcvd [IPCP ConfReq id=0x2 <addrs 0.0.0.0 0.0.0.0>]
   sent [IPCP ConfRej id=0x2 <addrs 0.0.0.0 0.0.0.0>]
   rcvd [IPCP ConfAck id=0x2 <addr 192.168.4.0>]
   rcvd [IPCP ConfReq id=0x3]
   sent [IPCP ConfAck id=0x3]
   Could not determine remote IP address: defaulting to 10.64.64.65
   ioctl(SIOCSIFADDR): No such device (line 2630)
   Interface configuration failed
   Couldn't get PPP statistics: No such device
   ioctl (SIOCGIFFLAGS): No such device (line 2587)
   ioctl(SIOCSIFADDR): No such device (line 2750)
   sent [IPCP TermReq id=0x3 "Interface configuration failed"]
   rcvd [IPCP TermReq id=0x4 "Could not determine local IP address"]
   sent [IPCP TermAck id=0x4]
   rcvd [IPCP TermAck id=0x3]
   Couldn't get PPP statistics: No such device
   sent [LCP TermReq id=0x2 "No network protocols running"]
   rcvd [LCP TermReq id=0x3 "No network protocols running"]
   sent [LCP TermAck id=0x3]
   rcvd [LCP TermAck id=0x2]
   Connection terminated.

We have tried the above setup and configuration between two virtual machines running on Ubuntu 18.04 and were able to successfully establish XL2TPD over PPPoE. Any suggestions or help would be much appreciated.