Ubuntu

軟醚。客戶端可以連接，但我無法訪問伺服器

  • June 2, 2015

我按照本指南在 Digital Ocean Ubuntu 14.04 實例上設置 Softether VPN 伺服器。我在筆記型電腦（ubuntu 14.10）上安裝了 Softether vpn 客戶端和 openvpn。

伺服器日誌表明兩個客戶端都可以正常連接，但我無法 ping 或 telnet 到伺服器。另外，當我連接到 openvpn 時，我失去了所有的網際網路，除了 Skype。

使用 openvpn 客戶端 netstat -nr 報告如下。

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.30.14   128.0.0.0       UG        0 0          0 tun0
0.0.0.0         192.168.4.1     0.0.0.0         UG        0 0          0 eth0
54.158.28.151   192.168.4.1     255.255.255.255 UGH       0 0          0 eth0
128.0.0.0       192.168.30.14   128.0.0.0       UG        0 0          0 tun0
192.168.4.0     0.0.0.0         255.255.252.0   U         0 0          0 eth0
192.168.30.14   0.0.0.0         255.255.255.255 UH        0 0          0 tun0

使用 Softether 客戶端，netstat -nr 報告以下內容：

Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
0.0.0.0         192.168.4.1     0.0.0.0         UG        0 0          0 eth0
192.168.4.0     0.0.0.0         255.255.252.0   U         0 0          0 eth0

ping 到 telnet 到 192.168.30.14 超時。

Softether vpn 客戶端 ifconfig -a 報告以下內容。

vpn_markadapter Link encap:Ethernet HWaddr 00:ac:c5:ff:ce:ec 
inet6 addr: fe80::2ac:c5ff:feff:ceec/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1620 errors:0 dropped:0 overruns:0 frame:0
TX packets:1234 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:500 
RX bytes:118928 (118.9 KB) TX bytes:104989 (104.9 KB)

openvpn 客戶端，ifconfig -a：

tun0      Link encap:UNSPEC  HWaddr 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  
     inet addr:192.168.30.13  P-t-P:192.168.30.14      Mask:255.255.255.255
     UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
     RX packets:280 errors:0 dropped:0 overruns:0 frame:0
     TX packets:534 errors:0 dropped:0 overruns:0 carrier:0
     collisions:0 txqueuelen:100 
     RX bytes:38199 (38.1 KB)  TX bytes:60461 (60.4 KB)

Openvpn 控制台：

Thu May 28 19:10:12 2015 WARNING: No server certificate verification method has been enabled.  See http://openvpn.net/howto.html#mitm for more info.
Thu May 28 19:10:12 2015 Socket Buffers: R=[87380->131072] S=[16384->131072]
Thu May 28 19:10:12 2015 Attempting to establish TCP connection with [AF_INET]128.199.126.151:5555 [nonblock]
Thu May 28 19:10:13 2015 TCP connection established with [AF_INET]128.199.126.151:5555
Thu May 28 19:10:13 2015 TCPv4_CLIENT link local: [undef]
Thu May 28 19:10:13 2015 TCPv4_CLIENT link remote: [AF_INET]128.199.126.151:5555
Thu May 28 19:10:13 2015 TLS: Initial packet from [AF_INET]128.199.126.151:5555, sid=16ccbc28 f3c5eca8
Thu May 28 19:10:13 2015 WARNING: this configuration may cache passwords in memory -- use the auth-nocache option to prevent this
Thu May 28 19:10:14 2015 VERIFY OK: depth=0, CN=[128.199.126.151], O=[128.199.126.151], OU=[128.199.126.151], C=US
Thu May 28 19:10:14 2015 Data Channel Encrypt: Cipher 'AES-128-CBC' initialized with 128 bit key
Thu May 28 19:10:14 2015 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Thu May 28 19:10:14 2015 Data Channel Decrypt: Cipher 'AES-128-CBC' initialized with 128 bit key
Thu May 28 19:10:14 2015 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Thu May 28 19:10:14 2015 Control Channel: TLSv1, cipher TLSv1/SSLv3 DHE-RSA-AES256-SHA, 2048 bit RSA
Thu May 28 19:10:14 2015 [[128.199.126.151]] Peer Connection Initiated with [AF_INET]128.199.126.151:5555
Thu May 28 19:10:16 2015 SENT CONTROL [[128.199.126.151]]: 'PUSH_REQUEST' (status=1)
Thu May 28 19:10:16 2015 PUSH: Received control message: 'PUSH_REPLY,ping 3,ping-restart 10,ifconfig 192.168.30.13 192.168.30.14,dhcp-option DNS 192.168.30.1,route-gateway 192.168.30.14,redirect-gateway def1'
Thu May 28 19:10:16 2015 OPTIONS IMPORT: timers and/or timeouts modified
Thu May 28 19:10:16 2015 OPTIONS IMPORT: --ifconfig/up options modified
Thu May 28 19:10:16 2015 OPTIONS IMPORT: route options modified
Thu May 28 19:10:16 2015 OPTIONS IMPORT: route-related options modified
Thu May 28 19:10:16 2015 OPTIONS IMPORT: --ip-win32 and/or --dhcp-option options modified
Thu May 28 19:10:16 2015 ROUTE_GATEWAY 192.168.4.1/255.255.252.0 IFACE=eth0 HWADDR=b8:ac:6f:50:18:af
Thu May 28 19:10:16 2015 TUN/TAP device tun0 opened
Thu May 28 19:10:16 2015 TUN/TAP TX queue length set to 100
Thu May 28 19:10:16 2015 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Thu May 28 19:10:16 2015 /sbin/ip link set dev tun0 up mtu 1500
Thu May 28 19:10:16 2015 /sbin/ip addr add dev tun0 local 192.168.30.13 peer 192.168.30.14
Thu May 28 19:10:16 2015 /sbin/ip route add 128.199.126.151/32 via 192.168.4.1
Thu May 28 19:10:16 2015 /sbin/ip route add 0.0.0.0/1 via 192.168.30.14
Thu May 28 19:10:16 2015 /sbin/ip route add 128.0.0.0/1 via 192.168.30.14
Thu May 28 19:10:16 2015 Initialization Sequence Completed

如果客戶端是linux，則需要在softether啟動腳本末尾添加“dhclient tunx”命令。添加睡眠延遲時間也可以確保在啟動 dhclient 命令之前已連接 vpn。

你的配置沒問題。看起來有什麼東西阻止了您的傳出流量。我不確定它是什麼，可能是防火牆。

引用自：https://serverfault.com/questions/694957

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