使用单个公共 IP NIC 设置桥接 OpenVPN 服务器

Question

使用单个公共 IP NIC 设置桥接 OpenVPN 服务器

Tom*_*asz 6 networking vpn routing openvpn bridge

我一直在尝试设置桥接OpenVPN 服务器，但没有取得多大成功。我有一个运行 Ubuntu 的 VPS，它有一个网卡，它为它分配了静态公共 IP。我希望能够有几个客户端连接到它并形成一个网络，该网络可以像普通 LAN 一样工作，并具有工作广播。

物理连接示意图：物理网络连接

我想有laptop和desktop，并server在一个网络让我们说10.0.0.0/24。使用下面的配置，我只能连接到 OpenVPN 服务器，但机器之间没有实际连接。我让它工作的最远的是server只能看到ARP来自客户端的请求，但不会发回任何响应。我无法server从任何客户端ping ，任何来自server. 我显然做错了什么，但不能把我的手指放在它上面。请告诉我某处有错别字。

server的接口：

root@server:~# cat /etc/network/interfaces    
auto lo
iface lo inet loopback

auto eth0
iface eth0 inet manual
  up ip link set $IFACE addr f2:3c:91:69:33:c2 promisc on up
  down ip link set $IFACE down

auto tap0
iface tap0 inet manual
  pre-up openvpn --mktun --dev $IFACE
  up ip link set $IFACE addr f2:3c:91:69:33:c1 promisc on up
  down ip link set $IFACE down
  post-down openvpn --rmtun --dev $IFACE

auto br0
iface br0 inet dhcp
  bridge_ports eth0 tap0
  bridge_fd 0
  bridge_stp off
  pre-up ip link set $IFACE addr f2:3c:91:69:33:c3 # DHCP filters by MAC

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server 启用 IPv4 转发：

root@server:~# sysctl -p
net.ipv4.ip_forward = 1

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server 配置：

proto         udp
dev           tap0
port          1194
local         vpn.server.tld

server-bridge 10.0.0.2 255.255.255.0 10.0.0.128 10.0.0.254
push          "route 10.0.0.0 255.255.255.0"
client-to-client

ca            keys/ca.crt
cert          keys/server.crt
key           keys/server.key
dh            keys/dh1024.pem
tls-server
tls-auth      keys/ta.key 0

user          nobody
group         nogroup
persist-key
persist-tun

keepalive     10 60
comp-lzo

status        /var/log/openvpn.status
log           /var/log/openvpn.log
verb          3

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desktop 配置：

client
proto        udp
dev          tap
port         20251 # forwarded in office router
remote       vpn.server.tld 1194

ca           ../keys/ca.crt
cert         ../keys/tomasz@desktop.crt
key          ../keys/tomasz@desktop.key
tls-client
tls-auth     ../keys/ta.key 1
ns-cert-type server

persist-key
persist-tun

keepalive    10 60
comp-lzo
resolv-retry infinite

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server 连接日志：

root@server:~# tail -n 40 -f /var/log/openvpn.log
Sat Jul 27 00:32:30 2013 OpenVPN 2.2.1 x86_64-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] [eurephia] [MH] [PF_INET6] [IPv6 payload 20110424-2 (2.2RC2)] built on Feb 13 2013
Sat Jul 27 00:32:30 2013 NOTE: when bridging your LAN adapter with the TAP adapter, note that the new bridge adapter will often take on its own IP address that is different from what the LAN adapter was previously set to
Sat Jul 27 00:32:30 2013 NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
Sat Jul 27 00:32:30 2013 Diffie-Hellman initialized with 1024 bit key
Sat Jul 27 00:32:30 2013 Control Channel Authentication: using 'keys/ta.key' as a OpenVPN static key file
Sat Jul 27 00:32:30 2013 Outgoing Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
Sat Jul 27 00:32:30 2013 Incoming Control Channel Authentication: Using 160 bit message hash 'SHA1' for HMAC authentication
Sat Jul 27 00:32:30 2013 TLS-Auth MTU parms [ L:1574 D:166 EF:66 EB:0 ET:0 EL:0 ]
Sat Jul 27 00:32:30 2013 Socket Buffers: R=[212992->131072] S=[212992->131072]
Sat Jul 27 00:32:30 2013 TUN/TAP device tap0 opened
Sat Jul 27 00:32:30 2013 TUN/TAP TX queue length set to 100
Sat Jul 27 00:32:30 2013 Data Channel MTU parms [ L:1574 D:1450 EF:42 EB:135 ET:32 EL:0 AF:3/1 ]
Sat Jul 27 00:32:30 2013 GID set to nogroup
Sat Jul 27 00:32:30 2013 UID set to nobody
Sat Jul 27 00:32:30 2013 UDPv4 link local (bound): [AF_INET]79.123.43.99:1194
Sat Jul 27 00:32:30 2013 UDPv4 link remote: [undef]
Sat Jul 27 00:32:30 2013 MULTI: multi_init called, r=256 v=256
Sat Jul 27 00:32:30 2013 IFCONFIG POOL: base=10.0.0.128 size=127, ipv6=0
Sat Jul 27 00:32:30 2013 Initialization Sequence Completed
Sat Jul 27 00:32:44 2013 MULTI: multi_create_instance called
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 Re-using SSL/TLS context
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 LZO compression initialized
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 Control Channel MTU parms [ L:1574 D:166 EF:66 EB:0 ET:0 EL:0 ]
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 Data Channel MTU parms [ L:1574 D:1450 EF:42 EB:135 ET:32 EL:0 AF:3/1 ]
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 Local Options hash (VER=V4): '360696c5'
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 Expected Remote Options hash (VER=V4): '13a273ba'
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 TLS: Initial packet from [AF_INET]89.77.180.128:20251, sid=d27be456 62dc0bf7
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 VERIFY OK: depth=1, /C=**/ST=**/L=**/O=**/CN=**_Certification_Authority
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 VERIFY OK: depth=0, /C=**/ST=**/L=**/O=**/CN=tomasz@desktop
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 Data Channel Encrypt: Cipher 'BF-CBC' initialized with 128 bit key
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 Data Channel Encrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 Data Channel Decrypt: Cipher 'BF-CBC' initialized with 128 bit key
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 Data Channel Decrypt: Using 160 bit message hash 'SHA1' for HMAC authentication
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 Control Channel: TLSv1, cipher TLSv1/SSLv3 DHE-RSA-AES256-SHA, 1024 bit RSA
Sat Jul 27 00:32:44 2013 168.87.4.12:20251 [tomasz@desktop] Peer Connection Initiated with [AF_INET]168.87.4.12:20251
Sat Jul 27 00:32:44 2013 tomasz@desktop/168.87.4.12:20251 MULTI_sva: pool returned IPv4=10.0.0.128, IPv6=1::2100:0:0:0
Sat Jul 27 00:32:46 2013 tomasz@desktop/168.87.4.12:20251 PUSH: Received control message: 'PUSH_REQUEST'
Sat Jul 27 00:32:46 2013 tomasz@desktop/168.87.4.12:20251 send_push_reply(): safe_cap=960
Sat Jul 27 00:32:46 2013 tomasz@desktop/168.87.4.12:20251 SENT CONTROL [tomasz@desktop]: 'PUSH_REPLY,route 10.0.0.0 255.255.255.0,route-gateway 10.0.0.2,ping 10,ping-restart 60,ifconfig 10.0.0.128 255.255.255.0' (status=1)
Sat Jul 27 00:32:47 2013 tomasz@desktop/168.87.4.12:20251 MULTI: Learn: aa:7c:1d:c2:42:e1 -> tomasz@desktop/168.87.4.12:20251

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server运行 OpenVPN 的路由和接口：

root@remote:~# netstat -rn
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
default         79.123.43.1     0.0.0.0         UG        0 0          0 br0
79.123.43.0     *               255.255.255.0   U         0 0          0 br0

root@server:~# ifconfig
br0       Link encap:Ethernet  HWaddr f2:3c:91:69:33:c3  
          inet addr:79.123.43.99  Bcast:79.123.43.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:450 errors:0 dropped:0 overruns:0 frame:0
          TX packets:467 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:48685 (48.6 KB)  TX bytes:53043 (53.0 KB)

eth0      Link encap:Ethernet  HWaddr f2:3c:91:69:33:c2  
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:20803 errors:0 dropped:0 overruns:0 frame:0
          TX packets:26066 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000   
          RX bytes:2190355 (2.1 MB)  TX bytes:3683757 (3.6 MB)                                                                                                                
          Interrupt:76 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host  
          UP LOOPBACK RUNNING  MTU:65536  Metric:1
          RX packets:1183 errors:0 dropped:0 overruns:0 frame:0
          TX packets:1183 errors:0 dropped:0 overruns:0 carrier:0                                                                                                                    
          collisions:0 txqueuelen:0                                                                                                                                                  
          RX bytes:433649 (433.6 KB)  TX bytes:433649 (433.6 KB)

tap0      Link encap:Ethernet  HWaddr f2:3c:91:69:33:c1  
          UP BROADCAST RUNNING PROMISC MULTICAST  MTU:1500  Metric:1
          RX packets:6 errors:0 dropped:0 overruns:0 frame:0
          TX packets:39 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          RX bytes:1158 (1.1 KB)  TX bytes:3390 (3.3 KB)

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desktop的连接日志：

tomasz@desktop:$ sudo openvpn --config desktop.ovpn 
Sat Jul 27 00:58:33 2013 OpenVPN 2.3.2 x86_64-apple-darwin12.4.0 [SSL (OpenSSL)] [LZO] [eurephia] [MH] [IPv6] built on Jul 24 2013
Sat Jul 27 00:58:33 2013 Control Channel Authentication: using '../keys/ta.key' as a OpenVPN static key file
Sat Jul 27 00:58:33 2013 UDPv4 link local (bound): [undef]
Sat Jul 27 00:58:33 2013 UDPv4 link remote: [AF_INET]79.123.43.99:1194
Sat Jul 27 00:58:33 2013 [vpn.server.tld] Peer Connection Initiated with [AF_INET]79.123.43.99:1194
Sat Jul 27 00:58:36 2013 TUN/TAP device /dev/tap0 opened
Sat Jul 27 00:58:36 2013 do_ifconfig, tt->ipv6=0, tt->did_ifconfig_ipv6_setup=0
Sat Jul 27 00:58:36 2013 /sbin/ifconfig tap0 delete
ifconfig: ioctl (SIOCDIFADDR): Can't assign requested address
Sat Jul 27 00:58:36 2013 NOTE: Tried to delete pre-existing tun/tap instance -- No Problem if failure
Sat Jul 27 00:58:36 2013 /sbin/ifconfig tap0 10.0.0.128 netmask 255.255.255.0 mtu 1500 up
route: writing to routing socket: File exists
add net 10.0.0.0: gateway 10.0.0.2: File exists
Sat Jul 27 00:58:36 2013 Initialization Sequence Completed

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desktop运行 OpenVPN 的路由和接口：

tomasz@desktop$ ifconfig
en1: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    ether 00:26:bb:10:6e:14 
    inet6 fe80::226:bbff:fe10:6e14%en1 prefixlen 64 scopeid 0x5 
    inet 192.168.0.250 netmask 0xffffff00 broadcast 192.168.0.255
    media: autoselect
    status: active
tap0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
    ether aa:7c:1d:c2:42:e1 
    inet 10.0.0.128 netmask 0xffffff00 broadcast 10.0.0.255
    open (pid 14700)    

tomasz@desktop$ netstat -rn
Routing tables

Internet:
Destination        Gateway            Flags        Refs      Use   Netif Expire
default            192.168.0.1        UGSc           15      760     en1
10/24              link#8             UC              2        0    tap0
10.0.0.255         ff:ff:ff:ff:ff:ff  UHLWbI          0        4    tap0
127                127.0.0.1          UCS             0        0     lo0
127.0.0.1          127.0.0.1          UH              7     1873     lo0
169.254            link#5             UCS             0        0     en1
192.168.0          link#5             UCS             3        0     en1
192.168.0.1        80:c6:ab:cf:61:54  UHLWIir        16     4568     en1    704
192.168.0.250      127.0.0.1          UHS             0        0     lo0
192.168.0.255      ff:ff:ff:ff:ff:ff  UHLWbI          0        4     en1

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尝试从 pingserver时desktop：

tomasz@desktop:~$ ping -c 1 10.0.0.2
PING 10.0.0.2 (10.0.0.2): 56 data bytes
--- 10.0.0.2 ping statistics ---
1 packets transmitted, 0 packets received, 100.0% packet loss

tomasz@server:~$ sudo tcpdump -nel -i tap0
tcpdump: WARNING: tap0: no IPv4 address assigned
tcpdump: verbose output suppressed, use -v or -vv for full protocol decode
listening on tap0, link-type EN10MB (Ethernet), capture size 65535 bytes
01:02:44.023108 8a:13:46:10:03:ac > ff:ff:ff:ff:ff:ff, ethertype ARP (0x0806), length 42: Request who-has 10.0.0.2 tell 10.0.0.128, length 28

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Answer 1

Law*_*ceC 3

~~我认为在桥接模式下 OpenVPN 不会分发 IP。因此，您需要提供 DHCP 服务器来执行此操作。~~

仔细观察...这是我的想法。

我想你已经拿到tap0并eth0连接到桥上了br0？（brctl可以验证）

br0服务器上的 IP 不在 OpenVPN 子网内。

让我猜猜，eth0是您面向互联网的界面。你不需要这样做。不要放在eth0桥上。

我猜你想启用广播，即桥接设置，这样所有 VPN 主机都可以相互广播。我还没有这样做，但所有 VPN 化的主机应该能够在不eth0打开的情况下做到这一点br0。

之所以需要 OpenVPN 在服务器端建立一个桥接器，是为了连接 LAN 和 VPN。如果这是一个 VPS，听起来它背后并没有 LAN，因此不需要连接到另一个物理接口的桥接器，也不需要为您做任何事情。

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