我想在 Centos 机器和我的 pfSense 防火墙之间建立 ipsec 隧道。附件是 strongswan 状态的结果：
Active: active (running) since Tue 2020-12-08 17:56:54 CET; 2min 2s ago
Process: 1956 ExecStartPost=/usr/sbin/swanctl --load-all --noprompt (code=exited, status=0/SUCCESS)
Main PID: 1939 (charon-systemd)
Status: "charon-systemd running, strongSwan 5.8.2, Linux 5.4.73-1-pve, x86_64"
Tasks: 17 (limit: 24877)
Memory: 6.0M
CGroup: /system.slice/strongswan.service
└─1939 /usr/sbin/charon-systemd
swanctl[1956]: no files found matching '/etc/strongswan/swanctl/conf.d/*.conf'
swanctl[1956]: no authorities found, 0 unloaded
swanctl[1956]: no pools found, 0 unloaded
swanctl[1956]: no connections found, 0 unloaded
systemd[1]: Started strongSwan IPsec IKEv1/IKEv2 daemon using swanctl.
charon-systemd[1939]: received packet: from Y.Y.Y.Y[500] to X.X.X.X[500] (464 bytes)
charon-systemd[1939]: parsed IKE_SA_INIT request 0 [ SA KE No N(NATD_S_IP) N(NATD_D_IP) N(FRAG_SUP) N(>
charon-systemd[1939]: no IKE config found for X.X.X.X...Y.Y.Y.Y, sending NO_PROPOSAL_CHOSEN
charon-systemd[1939]: generating IKE_SA_INIT response 0 [ N(NO_PROP) ]
charon-systemd[1939]: sending packet: from X.X.X.X[500] to Y.Y.Y.Y[500] (36 bytes)
请提供任何帮助。