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draca
Asked: 2022-04-11 10:05:58 +0800 CST

OpenVPN 连接但 IP 不变

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我在个人 AWS EC2 实例上设置了 OpenVPN 服务器，并尝试从 Ubuntu 14.04 客户端连接到它。（我必须更新服务器以获得 TLS 1.0 的最低版本才能使握手工作）

现在，当我键入sudo openvpn --config client.ovpn它似乎连接时，通过以“初始化序列完成”结束日志消息

但是，在我的网络浏览器中，我的 IP 地址与我的家庭 IP 地址相同。

完成 vpn 连接需要什么？

编辑：我包括“ip route”和openvpn命令的日志输出

连接到 openvpn 之前的“ip route”输出

default via 192.168.1.1 dev eth0  proto static 
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.12  metric 1

注意：在下面的所有输出中，我已将我的 openvpn 服务器的公共 ip 替换为 111.222.333.444 以保持匿名

openvpn 命令的输出

sudo openvpn --config client.ovpn  --redirect-gateway def1  --auth-user-pass pass.txt 
Tue Apr 12 07:04:20 2022 OpenVPN 2.3.2 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [EPOLL] [PKCS11] [eurephia] [MH] [IPv6] built on Jun 22 2017
Tue Apr 12 07:04:20 2022 WARNING: file 'pass.txt' is group or others accessible
Tue Apr 12 07:04:20 2022 Control Channel Authentication: tls-auth using INLINE static key file
Tue Apr 12 07:04:20 2022 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
Tue Apr 12 07:04:20 2022 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
Tue Apr 12 07:04:20 2022 Socket Buffers: R=[212992->212992] S=[212992->212992]
Tue Apr 12 07:04:20 2022 UDPv4 link local: [undef]
Tue Apr 12 07:04:20 2022 UDPv4 link remote: [AF_INET]111.222.333.444:1194
Tue Apr 12 07:04:20 2022 TLS: Initial packet from [AF_INET]111.222.333.444:1194, sid=2847d960 bd54dabd
Tue Apr 12 07:04:20 2022 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Tue Apr 12 07:04:20 2022 VERIFY OK: depth=1, CN=OpenVPN CA
Tue Apr 12 07:04:20 2022 VERIFY OK: nsCertType=SERVER
Tue Apr 12 07:04:20 2022 VERIFY OK: depth=0, CN=OpenVPN Server
Tue Apr 12 07:04:21 2022 Data Channel Encrypt: Cipher 'AES-256-CBC' initialized with 256 bit key
Tue Apr 12 07:04:21 2022 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Tue Apr 12 07:04:21 2022 Data Channel Decrypt: Cipher 'AES-256-CBC' initialized with 256 bit key
Tue Apr 12 07:04:21 2022 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Tue Apr 12 07:04:21 2022 Control Channel: TLSv1, cipher TLSv1/SSLv3 ECDHE-RSA-AES256-SHA, 2048 bit RSA
Tue Apr 12 07:04:21 2022 [OpenVPN Server] Peer Connection Initiated with [AF_INET]111.222.333.444:1194
Tue Apr 12 07:04:23 2022 SENT CONTROL [OpenVPN Server]: 'PUSH_REQUEST' (status=1)
Tue Apr 12 07:04:23 2022 PUSH: Received control message: 'PUSH_REPLY,explicit-exit-notify,topology subnet,route-delay 5 30,dhcp-pre-release,dhcp-renew,dhcp-release,route-metric 101,ping 12,ping-restart 50,comp-lzo no,redirect-private def1,redirect-private bypass-dhcp,redirect-private autolocal,redirect-private bypass-dns,route-gateway 172.27.232.1,route 172.27.224.0 255.255.240.0,route 172.31.0.0 255.255.0.0,block-ipv6,ifconfig 172.27.232.15 255.255.248.0,auth-token SESS_ID'
Tue Apr 12 07:04:23 2022 Unrecognized option or missing parameter(s) in [PUSH-OPTIONS]:4: dhcp-pre-release (2.3.2)
Tue Apr 12 07:04:23 2022 Unrecognized option or missing parameter(s) in [PUSH-OPTIONS]:5: dhcp-renew (2.3.2)
Tue Apr 12 07:04:23 2022 Unrecognized option or missing parameter(s) in [PUSH-OPTIONS]:6: dhcp-release (2.3.2)
Tue Apr 12 07:04:23 2022 Unrecognized option or missing parameter(s) in [PUSH-OPTIONS]:18: block-ipv6 (2.3.2)
Tue Apr 12 07:04:23 2022 OPTIONS IMPORT: timers and/or timeouts modified
Tue Apr 12 07:04:23 2022 OPTIONS IMPORT: explicit notify parm(s) modified
Tue Apr 12 07:04:23 2022 OPTIONS IMPORT: LZO parms modified
Tue Apr 12 07:04:23 2022 OPTIONS IMPORT: --ifconfig/up options modified
Tue Apr 12 07:04:23 2022 OPTIONS IMPORT: route options modified
Tue Apr 12 07:04:23 2022 OPTIONS IMPORT: route-related options modified
Tue Apr 12 07:04:23 2022 ROUTE_GATEWAY 192.168.1.1/255.255.255.0 IFACE=eth0 HWADDR=ec:f4:bb:57:57:1a
Tue Apr 12 07:04:23 2022 TUN/TAP device tun0 opened
Tue Apr 12 07:04:23 2022 TUN/TAP TX queue length set to 100
Tue Apr 12 07:04:23 2022 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Tue Apr 12 07:04:23 2022 /sbin/ip link set dev tun0 up mtu 1500
Tue Apr 12 07:04:23 2022 /sbin/ip addr add dev tun0 172.27.232.15/21 broadcast 172.27.239.255
Tue Apr 12 07:04:28 2022 ROUTE remote_host is NOT LOCAL
Tue Apr 12 07:04:28 2022 /sbin/ip route add 111.222.333.444/32 via 192.168.1.1
Tue Apr 12 07:04:28 2022 /sbin/ip route add 0.0.0.0/1 via 172.27.232.1
Tue Apr 12 07:04:28 2022 /sbin/ip route add 128.0.0.0/1 via 172.27.232.1
Tue Apr 12 07:04:28 2022 /sbin/ip route add 172.27.224.0/20 via 172.27.232.1 metric 101
Tue Apr 12 07:04:28 2022 /sbin/ip route add 172.31.0.0/16 via 172.27.232.1 metric 101
Tue Apr 12 07:04:28 2022 Initialization Sequence Completed

连接到 openvpn 后的“ip route”输出

0.0.0.0/1 via 172.27.232.1 dev tun0
default via 192.168.1.1 dev eth0  proto static
111.222.333.444 via 192.168.1.1 dev eth0            
128.0.0.0/1 via 172.27.232.1 dev tun0
172.27.224.0/20 via 172.27.232.1 dev tun0  metric 101
172.27.232.0/21 dev tun0  proto kernel  scope link  src 172.27.232.15
172.31.0.0/16 via 172.27.232.1 dev tun0  metric 101
192.168.1.0/24 dev eth0  proto kernel  scope link  src 192.168.1.12  metric 1
openvpn

1 个回答

  1. Best Answer

    根据文档，为了通过服务器路由所有流量（而不仅仅是发往 VPN 网络的流量），服务器需要设置一个指令push "redirect-gateway def1"并且服务器需要适当地路由流量：

    将以下指令添加到服务器配置文件：

    push "redirect-gateway def1"

    如果您的 VPN 设置是通过无线网络进行的，其中所有客户端和服务器都在同一个无线子网上，请添加本地标志：

    push "redirect-gateway local def1"

    将重定向网关选项推送到客户端将导致源自客户端计算机的所有 IP 网络流量通过 OpenVPN 服务器。服务器将需要配置为以某种方式处理此流量，例如通过 NAT 将其连接到 Internet，或通过服务器站点的 HTTP 代理对其进行路由。

    在 Linux 上，您可以使用如下命令将 VPN 客户端流量 NAT 到互联网：

    iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE

    此命令假定 VPN 子网是 10.8.0.0/24（取自 OpenVPN 服务器配置中的 server 指令）并且本地以太网接口是 eth0。

    编辑：

    我相信丹尼尔的评论。VPN 处于活动状态时的路由表应该会在给定0.0.0.0/1 via 172.27.232.1 dev tun0和128.0.0.0/1 via 172.27.232.1 dev tun0行的情况下将您推过 VPN。traceroute 的输出8.8.8.8可以确认。

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