IPSEC 연결을 통한 LT2P 예기치 않은 종료 문제를 해결하는 방법

IPSEC 연결을 통한 LT2P 예기치 않은 종료 문제를 해결하는 방법

안녕하세요, 저는 Debian 10에서 네트워크 관리자를 사용하여 IPSEC VPN 연결을 통한 L2TP를 생성하고 있습니다. 매우 이상한 이유로 프로세스는 신호 15에서 종료됩니다. 다음 명령을 사용하여 연결을 설정합니다.

nmcli con up office

구성 파일 /etc/NetworkManager/system-connections/office.nmconnection은 다음과 같습니다.

[connection]
id=office
uuid=cf7498fb-01c9-44c1-91a9-789d6627950b
type=vpn
autoconnect=true
interface-name=--
permissions=

[vpn]
gateway=10.0.0.1
ipsec-enabled=yes
ipsec-psk=0sbWVuZWxhb3M3MTg=
mru=1400
mtu=1400
password-flags=0
ipsec-esp=3des-sha1
ipsec-ike=3des-sha1-modp1024!
#refuse-chap=yes
#refuse-mschap=yes
#refuse-pap=yes
#require-mppe=yes
user=raspberry1
service-type=org.freedesktop.NetworkManager.l2tp

[vpn-secrets]
password=...

[ipv4]
dns-search=
method=auto
never-default=true

[ipv6]
addr-gen-mode=stable-privacy
dns-search=
method=auto

/var/log/messages에서 연결과 오류를 볼 수 있습니다

May 19 07:25:01 rpi4-20210210 NetworkManager[391]: <info>  [1621409101.4139] agent-manager: req[0xffff98002ca0, :1.53/nmcli-connect/0]: agent registered
May 19 07:25:01 rpi4-20210210 NetworkManager[391]: <info>  [1621409101.4195] audit: op="connection-activate" uuid="cf7498fb-01c9-44c1-91a9-789d6627950b" name="office" pid=1330 uid=0 result="success"
May 19 07:25:01 rpi4-20210210 NetworkManager[391]: <info>  [1621409101.4277] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",0]: Started the VPN service, PID 1336
May 19 07:25:01 rpi4-20210210 NetworkManager[391]: <info>  [1621409101.4445] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",0]: Saw the service appear; activating connection
May 19 07:25:01 rpi4-20210210 NetworkManager[391]: <info>  [1621409101.4561] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",0]: VPN connection: (ConnectInteractive) reply received
May 19 07:25:01 rpi4-20210210 nm-l2tp-service[1336]: Check port 1701
May 19 07:25:04 rpi4-20210210 nm-l2tp-service[1336]: xl2tpd started with pid 1407
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.8892] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",0]: VPN plugin: state changed: starting (3)
May 19 07:25:04 rpi4-20210210 pppd[1408]: Plugin pppol2tp.so loaded.
May 19 07:25:04 rpi4-20210210 pppd[1408]: Plugin /usr/lib/pppd/2.4.7/nm-l2tp-pppd-plugin.so loaded.
May 19 07:25:04 rpi4-20210210 pppd[1408]: pppd 2.4.7 started by root, uid 0
May 19 07:25:04 rpi4-20210210 pppd[1408]: Using interface ppp0
May 19 07:25:04 rpi4-20210210 pppd[1408]: Connect: ppp0 <--> 
May 19 07:25:04 rpi4-20210210 pppd[1408]: Overriding mtu 1500 to 1400
May 19 07:25:04 rpi4-20210210 pppd[1408]: Overriding mru 1500 to mtu value 1400
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9186] manager: (ppp0): new Ppp device (/org/freedesktop/NetworkManager/Devices/9)
May 19 07:25:04 rpi4-20210210 pppd[1408]: Overriding mtu 1450 to 1400
May 19 07:25:04 rpi4-20210210 pppd[1408]: CHAP authentication succeeded
May 19 07:25:04 rpi4-20210210 pppd[1408]: local  IP address 10.1.1.10
May 19 07:25:04 rpi4-20210210 pppd[1408]: remote IP address 10.1.1.1
May 19 07:25:04 rpi4-20210210 pppd[1408]: primary   DNS address 10.1.1.1
May 19 07:25:04 rpi4-20210210 pppd[1408]: secondary DNS address 1.1.1.1
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9512] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",0]: VPN connection: (IP4 Config Get) reply received from old-style plugin
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9524] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data: VPN Gateway: 10.0.0.1
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9525] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data: Tunnel Device: "ppp0"
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9526] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data: IPv4 configuration:
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9526] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data:   Internal Address: 10.1.1.10
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9526] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data:   Internal Prefix: 32
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9527] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data:   Internal Point-to-Point Address: 10.1.1.1
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9527] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data:   Static Route: 10.1.1.1/32   Next Hop: 0.0.0.0
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9527] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data:   Internal DNS: 10.1.1.1
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9528] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data:   Internal DNS: 1.1.1.1
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9528] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data:   DNS Domain: '(none)'
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9528] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: Data: No IPv6 configuration
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9529] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: VPN plugin: state changed: started (4)
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9592] vpn-connection[0xaaaafdcd24d0,cf7498fb-01c9-44c1-91a9-789d6627950b,"office",9:(ppp0)]: VPN connection: (IP Config Get) complete
May 19 07:25:04 rpi4-20210210 NetworkManager[391]: <info>  [1621409104.9596] device (ppp0): state change: unmanaged -> unavailable (reason 'connection-assumed', sys-iface-state: 'external')
May 19 07:25:05 rpi4-20210210 NetworkManager[391]: <info>  [1621409105.0093] device (ppp0): state change: unavailable -> disconnected (reason 'none', sys-iface-state: 'external')
May 19 07:26:35 rpi4-20210210 NetworkManager[391]: <info>  [1621409195.9260] device (ppp0): state change: disconnected -> unmanaged (reason 'connection-assumed', sys-iface-state: 'external')
May 19 07:26:35 rpi4-20210210 pppd[1408]: Terminating on signal 15
May 19 07:26:35 rpi4-20210210 pppd[1408]: Connect time 1.6 minutes.
May 19 07:26:35 rpi4-20210210 pppd[1408]: Sent 0 bytes, received 343296 bytes.
May 19 07:26:35 rpi4-20210210 pppd[1408]: Overriding mtu 1500 to 1400
May 19 07:26:35 rpi4-20210210 pppd[1408]: Overriding mru 1500 to mtu value 1400

연결되면 잘 되는 것 같은데, 원인이 될 수 있는 "상태 변경: 관리되지 않음 -> 사용할 수 없음(이유 '연결 가정', sys-iface-state: '외부')"을 진단할 수 없습니다. ppp 클라이언트 연결을 종료하려면 신호 15를 보냅니다.

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