Ubuntu

VPN 客戶端沒有網際網路連接

  • November 26, 2019

我在 AWS 上使用 Ubuntu 18.04 LTS,我正在嘗試使用商業 VPN (PIA) 設置拆分隧道。

我無法立即使用他們的 .opvn 配置,因為當我這樣做時,我的 SSH 連接斷開,我必須重新啟動伺服器才能恢復,所以我添加了pull-filter ignore redirect-gateway(這是route-nopull.

我的 .opvn 文件 (NYC.opvn) 包含以下內容:

client
dev tun
proto udp
remote us-newyorkcity.privateinternetaccess.com 1198
resolv-retry infinite
nobind
persist-key
persist-tun
cipher aes-128-cbc
auth sha1
tls-client
remote-cert-tls server
pull-filter ignore redirect-gateway

auth-user-pass login.conf
compress
verb 1
reneg-sec 0

我開始隧道sudo openvpn NYC.opvn並得到這個:

Wed Nov 20 17:34:52 2019 OpenVPN 2.4.4 x86_64-pc-linux-gnu [SSL (OpenSSL)] [LZO] [LZ4] [EPOLL] [PKCS11] [MH/PKTINFO] [AEAD] built on May 14 2019
Wed Nov 20 17:34:52 2019 library versions: OpenSSL 1.1.1d  10 Sep 2019, LZO 2.08
Wed Nov 20 17:34:52 2019 TCP/UDP: Preserving recently used remote address: [AF_INET]209.95.50.11:1198
Wed Nov 20 17:34:52 2019 UDP link local: (not bound)
Wed Nov 20 17:34:52 2019 UDP link remote: [AF_INET]209.95.50.11:1198
Wed Nov 20 17:34:52 2019 [8d26667dabcc2a9cc7b10009813a306a] Peer Connection Initiated with [AF_INET]209.95.50.11:1198
Wed Nov 20 17:34:53 2019 TUN/TAP device tun0 opened
Wed Nov 20 17:34:53 2019 do_ifconfig, tt->did_ifconfig_ipv6_setup=0
Wed Nov 20 17:34:53 2019 /sbin/ip link set dev tun0 up mtu 1500
Wed Nov 20 17:34:53 2019 /sbin/ip addr add dev tun0 local 10.43.11.6 peer 10.43.11.5
Wed Nov 20 17:34:53 2019 Initialization Sequence Completed

但是,我在 tun0 上沒有網際網路訪問權限:

curl --interface tun0 -v ipinfo.io
* Rebuilt URL to: ipinfo.io/
*   Trying 216.239.38.21...
* TCP_NODELAY set
* Local Interface tun0 is ip 10.43.11.6 using address family 2
* Local port: 0

它只是掛起(curl --interface ens5 -v ipinfo.io工作正常)。

關於網路(VPN啟動後):

route -n

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.31.32.1     0.0.0.0         UG    100    0        0 ens5
10.43.11.1      10.43.11.5      255.255.255.255 UGH   0      0        0 tun0
10.43.11.5      0.0.0.0         255.255.255.255 UH    0      0        0 tun0
172.31.32.0     0.0.0.0         255.255.240.0   U     0      0        0 ens5
172.31.32.1     0.0.0.0         255.255.255.255 UH    100    0        0 ens5


ip addr show

1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
   link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
   inet 127.0.0.1/8 scope host lo
      valid_lft forever preferred_lft forever
   inet6 ::1/128 scope host 
      valid_lft forever preferred_lft forever
2: ens5: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9001 qdisc mq state UP group default qlen 1000
   link/ether 0e:a7:57:4c:36:ab brd ff:ff:ff:ff:ff:ff
   inet 172.31.47.214/20 brd 172.31.47.255 scope global dynamic ens5
      valid_lft 3359sec preferred_lft 3359sec
   inet6 fe80::ca7:57ff:fe4c:36ab/64 scope link 
      valid_lft forever preferred_lft forever
19: tun0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100
   link/none 
   inet 10.43.11.6 peer 10.43.11.5/32 scope global tun0
      valid_lft forever preferred_lft forever
   inet6 fe80::2444:7d65:81eb:af01/64 scope link stable-privacy 
      valid_lft forever preferred_lft forever

如何讓網際網路在 tun0 上工作,以便可以將它與 cURL 一起使用?

非常感謝


編輯

一位網路管理員告訴我,我必須執行以下操作:

  • 再創建一張路由表
  • 通過 10.43.11.5 將預設路由添加到該自定義表 0.0.0.0/0
  • 為來自 tun0 的數據包添加規則以從該新路由表中查找路由

所以我做了:

(注意: tun0 IP 自原始發布以來已更改,現在是inet 10.55.10.6 netmask 255.255.255.255 destination 10.55.10.5

echo "1000 vpn" >> /etc/iproute2/rt_tables
ip route add default via 10.55.10.5 dev tun0 table vpn
ip rule add iif tun0 lookup vpn
ip route add 255.255.255.255 dev tun0 proto kernel src 10.55.10.6 table vpn

不幸的是,cURL 仍然掛起:

curl -v --interface tun0  http://ipinfo.io
* Rebuilt URL to: http://ipinfo.io/
*   Trying 216.239.36.21...
* TCP_NODELAY set
* Local Interface tun0 is ip 10.55.10.6 using address family 2
* Local port: 0

以下是更多調試數據:

ubuntu@ip-172-31-47-214:~$ route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.31.32.1     0.0.0.0         UG    100    0        0 ens5
10.55.10.1      10.55.10.5      255.255.255.255 UGH   0      0        0 tun0
10.55.10.5      0.0.0.0         255.255.255.255 UH    0      0        0 tun0
172.31.32.0     0.0.0.0         255.255.240.0   U     0      0        0 ens5
172.31.32.1     0.0.0.0         255.255.255.255 UH    100    0        0 ens5
ubuntu@ip-172-31-47-214:~$ ifconfig
ens5: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 9001
       inet 172.31.47.214  netmask 255.255.240.0  broadcast 172.31.47.255
       inet6 fe80::ca7:57ff:fe4c:36ab  prefixlen 64  scopeid 0x20<link>
       ether 0e:a7:57:4c:36:ab  txqueuelen 1000  (Ethernet)
       RX packets 1188  bytes 117537 (117.5 KB)
       RX errors 0  dropped 0  overruns 0  frame 0
       TX packets 841  bytes 109924 (109.9 KB)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
       inet 127.0.0.1  netmask 255.0.0.0
       inet6 ::1  prefixlen 128  scopeid 0x10<host>
       loop  txqueuelen 1000  (Local Loopback)
       RX packets 168  bytes 13034 (13.0 KB)
       RX errors 0  dropped 0  overruns 0  frame 0
       TX packets 168  bytes 13034 (13.0 KB)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

tun0: flags=4305<UP,POINTOPOINT,RUNNING,NOARP,MULTICAST>  mtu 1500
       inet 10.55.10.6  netmask 255.255.255.255  destination 10.55.10.5
       inet6 fe80::28a:e5f2:9cdf:b63  prefixlen 64  scopeid 0x20<link>
       unspec 00-00-00-00-00-00-00-00-00-00-00-00-00-00-00-00  txqueuelen 100  (UNSPEC)
       RX packets 10  bytes 600 (600.0 B)
       RX errors 0  dropped 0  overruns 0  frame 0
       TX packets 13  bytes 684 (684.0 B)
       TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ubuntu@ip-172-31-47-214:~$ ip rule show
0:  from all lookup local 
32765:  from all iif tun0 lookup vpn 
32766:  from all lookup main 
32767:  from all lookup default 

man ip-rule:“……

oif NAME — 選擇要匹配的傳出設備。傳出介面僅適用於源自綁定到設備的本地套接字的數據包

……”

因此,而不是ip rule add iif tun0 lookup vpn你應該使用:

ip rule add oif tun0 lookup vpn

但實際上它不會起作用 ,因為輸出介面之前會被主路由表選擇。所以,唯一可行的選擇是ip rule基於源IP使用。例如,如果您確定 VPN 的 IP 將保留在網路10/8中,就像10.43.11.6它一樣簡單

ip rule add from 10.0.0.0/8 lookup vpn

引用自:https://serverfault.com/questions/992624