Amazon Linux 2よりL2TP/IPSecを使用して、VPN接続したい。

以下の記事を参考にL2TP/IPSecを設定しております。
https://qiita.com/t-kigi/items/c04f2cf287e7a2ae4ae5

ipsec verify
は全てOKとなっております。

ipsec auto --up L2TP
すると、

002 "L2TP" #1: initiating Main Mode
104 "L2TP" #1: STATE_MAIN_I1: initiate
010 "L2TP" #1: STATE_MAIN_I1: retransmission; will wait 0.5 seconds for response
010 "L2TP" #1: STATE_MAIN_I1: retransmission; will wait 1 seconds for response
010 "L2TP" #1: STATE_MAIN_I1: retransmission; will wait 2 seconds for response
010 "L2TP" #1: STATE_MAIN_I1: retransmission; will wait 4 seconds for response
010 "L2TP" #1: STATE_MAIN_I1: retransmission; will wait 8 seconds for response
010 "L2TP" #1: STATE_MAIN_I1: retransmission; will wait 16 seconds for response
010 "L2TP" #1: STATE_MAIN_I1: retransmission; will wait 32 seconds for response
031 "L2TP" #1: STATE_MAIN_I1: 60 second timeout exceeded after 7 retransmits.  No response (or no acceptable response) to our first IKEv1 message
000 "L2TP" #1: starting keying attempt 2 of at most 3, but releasing whack

となりました。コマンドが止まらない。

上記の原因を
調べても原因がわかりませんでした。

conn L2TP
     authby=secret
     pfs=no
     auto=add
     keyingtries=3
     dpddelay=30
     dpdtimeout=120
     dpdaction=clear
     keyexchange=ike
     phase2=esp
     encapsulation=yes
     rekey=yes
     ikelifetime=8h
     keylife=1h
     type=transport
     left=%defaultroute
     leftid=xxx.yyy.xxx.AAA
     right=ZZZ.YYY.XXX.CCC
     # rightid=SSS.TTT.UUU.VVV```

ipsec status

000 using kernel interface: netkey
000 interface lo/lo ::1@500
000 interface lo/lo 127.0.0.1@4500
000 interface lo/lo 127.0.0.1@500
000 interface eth0/eth0 172.31.32.76@4500
000 interface eth0/eth0 172.31.32.76@500
000
000
000 fips mode=disabled;
000 SElinux=disabled
000 seccomp=disabled
000
000 config setup options:
000
000 configdir=/etc, configfile=/etc/ipsec.conf, secrets=/etc/ipsec.secrets, ipsecdir=/etc/ipsec.d
000 nssdir=/etc/ipsec.d, dumpdir=/run/pluto, statsbin=unset
000 dnssec-rootkey-file=/var/lib/unbound/root.key, dnssec-trusted=<unset>
000 sbindir=/usr/sbin, libexecdir=/usr/libexec/ipsec
000 pluto_version=3.25, pluto_vendorid=OE-Libreswan-3.25
000 nhelpers=-1, uniqueids=yes, dnssec-enable=yes, perpeerlog=no, logappend=yes, logip=yes, shuntlifetime=900s, xfrmlifetime=300s
000 ddos-cookies-threshold=50000, ddos-max-halfopen=25000, ddos-mode=auto
000 ikeport=500, ikebuf=0, msg_errqueue=yes, strictcrlpolicy=no, crlcheckinterval=0, listen=<any>, nflog-all=0
000 ocsp-enable=no, ocsp-strict=no, ocsp-timeout=2, ocsp-uri=<unset>
000 ocsp-trust-name=<unset>
000 ocsp-cache-size=1000, ocsp-cache-min-age=3600, ocsp-cache-max-age=86400, ocsp-method=get
000 secctx-attr-type=32001
000 debug:
000
000 nat-traversal=yes, keep-alive=20, nat-ikeport=4500
000 virtual-private (%priv):
000 - allowed subnets: 10.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 25.0.0.0/8, 100.64.0.0/10, fd00::/8, fe80::/10
000
000 ESP algorithms supported:
000
000 algorithm ESP encrypt: id=3, name=ESP_3DES, ivlen=8, keysizemin=192, keysizemax=192
000 algorithm ESP encrypt: id=6, name=ESP_CAST, ivlen=8, keysizemin=128, keysizemax=128
000 algorithm ESP encrypt: id=11, name=ESP_NULL, ivlen=0, keysizemin=0, keysizemax=0
000 algorithm ESP encrypt: id=12, name=ESP_AES, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=13, name=ESP_AES_CTR, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=14, name=ESP_AES_CCM_A, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=15, name=ESP_AES_CCM_B, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=16, name=ESP_AES_CCM_C, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=18, name=ESP_AES_GCM_A, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=19, name=ESP_AES_GCM_B, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=20, name=ESP_AES_GCM_C, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=22, name=ESP_CAMELLIA, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=23, name=ESP_NULL_AUTH_AES_GMAC, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=252, name=ESP_SERPENT, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm ESP encrypt: id=253, name=ESP_TWOFISH, ivlen=8, keysizemin=128, keysizemax=256
000 algorithm AH/ESP auth: id=1, name=AUTH_ALGORITHM_HMAC_MD5, keysizemin=128, keysizemax=128
000 algorithm AH/ESP auth: id=2, name=AUTH_ALGORITHM_HMAC_SHA1, keysizemin=160, keysizemax=160
000 algorithm AH/ESP auth: id=5, name=AUTH_ALGORITHM_HMAC_SHA2_256, keysizemin=256, keysizemax=256
000 algorithm AH/ESP auth: id=6, name=AUTH_ALGORITHM_HMAC_SHA2_384, keysizemin=384, keysizemax=384
000 algorithm AH/ESP auth: id=7, name=AUTH_ALGORITHM_HMAC_SHA2_512, keysizemin=512, keysizemax=512
000 algorithm AH/ESP auth: id=8, name=AUTH_ALGORITHM_HMAC_RIPEMD, keysizemin=160, keysizemax=160
000 algorithm AH/ESP auth: id=9, name=AUTH_ALGORITHM_AES_XCBC, keysizemin=128, keysizemax=128
000 algorithm AH/ESP auth: id=250, name=AUTH_ALGORITHM_AES_CMAC_96, keysizemin=128, keysizemax=128
000 algorithm AH/ESP auth: id=251, name=AUTH_ALGORITHM_NULL_KAME, keysizemin=0, keysizemax=0
000
000 IKE algorithms supported:
000
000 algorithm IKE encrypt: v1id=5, v1name=OAKLEY_3DES_CBC, v2id=3, v2name=3DES, blocksize=8, keydeflen=192
000 algorithm IKE encrypt: v1id=8, v1name=OAKLEY_CAMELLIA_CBC, v2id=23, v2name=CAMELLIA_CBC, blocksize=16, keydeflen=128
000 algorithm IKE encrypt: v1id=-1, v1name=n/a, v2id=20, v2name=AES_GCM_C, blocksize=16, keydeflen=128
000 algorithm IKE encrypt: v1id=-1, v1name=n/a, v2id=19, v2name=AES_GCM_B, blocksize=16, keydeflen=128
000 algorithm IKE encrypt: v1id=-1, v1name=n/a, v2id=18, v2name=AES_GCM_A, blocksize=16, keydeflen=128
000 algorithm IKE encrypt: v1id=13, v1name=OAKLEY_AES_CTR, v2id=13, v2name=AES_CTR, blocksize=16, keydeflen=128
000 algorithm IKE encrypt: v1id=7, v1name=OAKLEY_AES_CBC, v2id=12, v2name=AES_CBC, blocksize=16, keydeflen=128
000 algorithm IKE encrypt: v1id=65004, v1name=OAKLEY_SERPENT_CBC, v2id=65004, v2name=SERPENT_CBC, blocksize=16, keydeflen=128
000 algorithm IKE encrypt: v1id=65005, v1name=OAKLEY_TWOFISH_CBC, v2id=65005, v2name=TWOFISH_CBC, blocksize=16, keydeflen=128
000 algorithm IKE encrypt: v1id=65289, v1name=OAKLEY_TWOFISH_CBC_SSH, v2id=65289, v2name=TWOFISH_CBC_SSH, blocksize=16, keydeflen=128
000 algorithm IKE PRF: name=HMAC_MD5, hashlen=16
000 algorithm IKE PRF: name=HMAC_SHA1, hashlen=20
000 algorithm IKE PRF: name=HMAC_SHA2_256, hashlen=32
000 algorithm IKE PRF: name=HMAC_SHA2_384, hashlen=48
000 algorithm IKE PRF: name=HMAC_SHA2_512, hashlen=64
000 algorithm IKE PRF: name=AES_XCBC, hashlen=16
000 algorithm IKE DH Key Exchange: name=MODP1024, bits=1024
000 algorithm IKE DH Key Exchange: name=MODP1536, bits=1536
000 algorithm IKE DH Key Exchange: name=MODP2048, bits=2048
000 algorithm IKE DH Key Exchange: name=MODP3072, bits=3072
000 algorithm IKE DH Key Exchange: name=MODP4096, bits=4096
000 algorithm IKE DH Key Exchange: name=MODP6144, bits=6144
000 algorithm IKE DH Key Exchange: name=MODP8192, bits=8192
000 algorithm IKE DH Key Exchange: name=DH19, bits=512
000 algorithm IKE DH Key Exchange: name=DH20, bits=768
000 algorithm IKE DH Key Exchange: name=DH21, bits=1056
000 algorithm IKE DH Key Exchange: name=DH22, bits=1024
000 algorithm IKE DH Key Exchange: name=DH23, bits=2048
000 algorithm IKE DH Key Exchange: name=DH24, bits=2048
000
000 stats db_ops: {curr_cnt, total_cnt, maxsz} :context={0,0,0} trans={0,0,0} attrs={0,0,0}
000
000 Connection list:
000
000 "L2TP": 172.31.32.76[zz.178.yy.xx]---172.31.32.1...222.228.xxx.yyy<222.228.220.xxx>; unrouted; eroute owner: #0
000 "L2TP":     oriented; my_ip=unset; their_ip=unset; my_updown=ipsec _updown;
000 "L2TP":   xauth us:none, xauth them:none,  my_username=[any]; their_username=[any]
000 "L2TP":   our auth:secret, their auth:secret
000 "L2TP":   modecfg info: us:none, them:none, modecfg policy:push, dns:unset, domains:unset, banner:unset, cat:unset;
000 "L2TP":   labeled_ipsec:no;
000 "L2TP":   policy_label:unset;
000 "L2TP":   ike_life: 28800s; ipsec_life: 3600s; replay_window: 32; rekey_margin: 540s; rekey_fuzz: 100%; keyingtries: 3;
000 "L2TP":   retransmit-interval: 500ms; retransmit-timeout: 60s;
000 "L2TP":   initial-contact:no; cisco-unity:no; fake-strongswan:no; send-vendorid:no; send-no-esp-tfc:no;
000 "L2TP":   policy: PSK+ENCRYPT+UP+IKEV1_ALLOW+IKEV2_ALLOW+SAREF_TRACK+IKE_FRAG_ALLOW+ESN_NO;
000 "L2TP":   conn_prio: 32,32; interface: eth0; metric: 0; mtu: unset; sa_prio:auto; sa_tfc:none;
000 "L2TP":   nflog-group: unset; mark: unset; vti-iface:unset; vti-routing:no; vti-shared:no; nic-offload:auto;
000 "L2TP":   our idtype: ID_IPV4_ADDR; our id=54.178.40.74; their idtype: ID_IPV4_ADDR; their id=222.228.220.222
000 "L2TP":   dpd: action:clear; delay:30; timeout:120; nat-t: encaps:yes; nat_keepalive:yes; ikev1_natt:both
000 "L2TP":   newest ISAKMP SA: #0; newest IPsec SA: #0;
000
000 Total IPsec connections: loaded 1, active 0
000
000 State Information: DDoS cookies not required, Accepting new IKE connections
000 IKE SAs: total(1), half-open(1), open(0), authenticated(0), anonymous(0)
000 IPsec SAs: total(0), authenticated(0), anonymous(0)
000
000 #2: "L2TP":500 STATE_MAIN_I1 (sent MI1, expecting MR1); EVENT_v1_RETRANSMIT in 16s; nodpd; idle; import:admin initiate
000 #2: pending Phase 2 for "L2TP"
000
000 Bare Shunt list:
000

行動規範の内容に同意します

回答1件

ベストアンサー

UDP 500, 4500 番ポートに接続できていないように思います。
「right=ZZZ.YYY.XXX.CCC」が VPN サーバーの IP アドレスと思いますが、Amazon Linux 2 から ZZZ.YYY.XXX.CCC に ping(ICMP) やその他の TCP, UDP ポートで疎通できるか確認ください。

** (2020/08/17 23:32) 追記**