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Marat Gainutdinov
Asked: 2021-11-12 00:48:38 +0800 CST

使用 TAP 设备在 Linux 上桥接（Virtualbox）

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使用 TAP 设备在 Linux 上桥接

您好，我有以下架构：

在此处输入图像描述 为了能够 ping 远程主机，在我的情况下是分离主机 1，我启动了桥接设备 br0，它在服务器上结合了 tap0 + eth2，并将本地网络（192.168.111.0/24）与远程 openvpn 客户端（vpn2）桥接，但是仍然没有运气，请你建议我做错了什么

我可以 ping：vpn1 -> vpn2 vpn2 -> vpn1 vpn1 -> separatehost1 我无法从 vpn2（客户端）ping 单独的host1，反之亦然（目标主机无法访问）。

服务器配置文件

#Server config
proto udp
port 1194
persist-key
persist-tun
keepalive 10 60
tls-auth /etc/openvpn/movpn/ta.key 0
remote-cert-tls client
dh /etc/openvpn/movpn/dh2048.pem
ca /etc/openvpn/movpn/ca.crt
cert /etc/openvpn/movpn/server.crt
key /etc/openvpn/movpn/server.key
user nobody
group nogroup
# use ‘group nogroup’ on Debian/Ubuntu
verb 3
daemon
log-append /var/log/openvpn.log
#client-to-client
dev tap0
server-bridge 192.168.111.101 255.255.255.0 192.168.111.128 192.168.111.200

所有模式都是使用 Vagrantfile + net.ipv4.ip_forward = 1 创建的。

调出br0界面的脚本：

 #!/bin/bash
 br="br0"
 tap="tap0"
 eth="eth2"
 br_ip="192.168.111.101"
 br_netmask="255.255.255.0"
 br_broadcast="192.168.111.255"
 # Create the tap adapter
 openvpn --mktun --dev $tap
 # Create the bridge and add interfaces
 brctl addbr $br
 brctl addif $br $eth
 brctl addif $br $tap
 # Configure the bridge
 ifconfig $tap 0.0.0.0 promisc up
 ifconfig $eth 0.0.0.0 promisc up
 ifconfig $br $br_ip netmask $br_netmask broadcast $br_broadcast

在此处输入图像描述

根据我的故障排除，服务器没有将icmp数据包转发到separatehost1，我不知道为什么......

在此处输入图像描述

root@vpn1:/etc/openvpn/movpn# ip -d link show br0
12: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether 08:00:27:6c:77:40 brd ff:ff:ff:ff:ff:ff promiscuity 0 
    bridge forward_delay 1500 hello_time 200 max_age 2000 ageing_time 30000 stp_state 0 priority 32768 vlan_filtering 0 vlan_protocol 802.1Q bridge_id 8000.8:0:27:6c:77:40 designated_root 8000.8:0:27:6c:77:40 root_port 0 root_path_cost 0 topology_change 0 topology_change_detected 0 hello_timer    0.00 tcn_timer    0.00 topology_change_timer    0.00 gc_timer  150.00 vlan_default_pvid 1 vlan_stats_enabled 0 group_fwd_mask 0 group_address 01:80:c2:00:00:00 mcast_snooping 1 mcast_router 1 mcast_query_use_ifaddr 0 mcast_querier 0 mcast_hash_elasticity 4 mcast_hash_max 512 mcast_last_member_count 2 mcast_startup_query_count 2 mcast_last_member_interval 100 mcast_membership_interval 26000 mcast_querier_interval 25500 mcast_query_interval 12500 mcast_query_response_interval 1000 mcast_startup_query_interval 3124 mcast_stats_enabled 0 mcast_igmp_version 2 mcast_mld_version 1 nf_call_iptables 0 nf_call_ip6tables 0 nf_call_arptables 0 addrgenmode eui64 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 
root@vpn1:/etc/openvpn/movpn# ip link
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 08:00:27:b4:26:99 brd ff:ff:ff:ff:ff:ff
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000
    link/ether 08:00:27:db:97:af brd ff:ff:ff:ff:ff:ff
4: eth2: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP mode DEFAULT group default qlen 1000
    link/ether 08:00:27:6c:77:40 brd ff:ff:ff:ff:ff:ff
11: tap0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP mode DEFAULT group default qlen 100
    link/ether d6:df:32:8a:b0:5e brd ff:ff:ff:ff:ff:ff
12: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP mode DEFAULT group default qlen 1000
    link/ether 08:00:27:6c:77:40 brd ff:ff:ff:ff:ff:ff

root@separatehosts1:~# ip a
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
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:b4:26:99 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic eth0
       valid_lft 76182sec preferred_lft 76182sec
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:a5:4b:55 brd ff:ff:ff:ff:ff:ff
    inet 192.168.111.102/24 brd 192.168.111.255 scope global eth1
       valid_lft forever preferred_lft forever

root@vpn1:/etc/openvpn/movpn# ip a
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
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:b4:26:99 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic eth0
       valid_lft 75325sec preferred_lft 75325sec
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:db:97:af brd ff:ff:ff:ff:ff:ff
    inet 192.168.33.101/24 brd 192.168.33.255 scope global eth1
       valid_lft forever preferred_lft forever
4: eth2: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 1000
    link/ether 08:00:27:6c:77:40 brd ff:ff:ff:ff:ff:ff
    inet6 fe80::a00:27ff:fe6c:7740/64 scope link 
       valid_lft forever preferred_lft forever
11: tap0: <BROADCAST,MULTICAST,PROMISC,UP,LOWER_UP> mtu 1500 qdisc fq_codel master br0 state UP group default qlen 100
    link/ether d6:df:32:8a:b0:5e brd ff:ff:ff:ff:ff:ff
12: br0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
    link/ether 08:00:27:6c:77:40 brd ff:ff:ff:ff:ff:ff
    inet 192.168.111.101/24 brd 192.168.111.255 scope global br0
       valid_lft forever preferred_lft forever
root@vpn2:/etc/openvpn/movpn# ip a
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
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:b4:26:99 brd ff:ff:ff:ff:ff:ff
    inet 10.0.2.15/24 brd 10.0.2.255 scope global dynamic eth0
       valid_lft 75777sec preferred_lft 75777sec
3: eth1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 08:00:27:d8:ad:47 brd ff:ff:ff:ff:ff:ff
    inet 192.168.33.102/24 brd 192.168.33.255 scope global eth1
       valid_lft forever preferred_lft forever
9: tap0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UNKNOWN group default qlen 100
    link/ether 2a:2f:98:b3:34:81 brd ff:ff:ff:ff:ff:ff
    inet 192.168.111.128/24 brd 192.168.111.255 scope global tap0
       valid_lft forever preferred_lft forever
openvpn virtualbox linux-networking vagrant

1 个回答

  1. Best Answer

    VirtualBox 默认在虚拟交换机代码中直接使用基于 MAC 的过滤。它知道 VM 的 MAC 地址，并且不传递任何其他数据包（除了多播和广播）。原因当然是安全性 - 否则 VM 可以尝试重定向流量等。

    几个小时后，我重新启动了所有主机，流量开始通过隧道，在我看来，Virtualbox 的虚拟交换机发现我已经创建了额外的接口，并且在重新启动之前阻止它们在重新启动 arp 请求并且所有流量开始正常工作： )

    希望这个答案能节省您的时间。

    单独的主机1-> vpn2

    root@separatehosts1:~# ping 192.168.111.128
PING 192.168.111.128 (192.168.111.128) 56(84) bytes of data.
64 bytes from 192.168.111.128: icmp_seq=1 ttl=64 time=2.62 ms
64 bytes from 192.168.111.128: icmp_seq=2 ttl=64 time=2.50 ms
64 bytes from 192.168.111.128: icmp_seq=3 ttl=64 time=2.42 ms
64 bytes from 192.168.111.128: icmp_seq=4 ttl=64 time=1.57 ms
64 bytes from 192.168.111.128: icmp_seq=5 ttl=64 time=2.53 ms
^C
--- 192.168.111.128 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4258ms
rtt min/avg/max/mdev = 1.571/2.333/2.624/0.386 ms

    vpn2 -> 分离主机1

    root@vpn2:~# ping 192.168.111.102
PING 192.168.111.102 (192.168.111.102) 56(84) bytes of data.
64 bytes from 192.168.111.102: icmp_seq=1 ttl=64 time=1.21 ms
64 bytes from 192.168.111.102: icmp_seq=2 ttl=64 time=2.02 ms
64 bytes from 192.168.111.102: icmp_seq=3 ttl=64 time=2.15 ms
64 bytes from 192.168.111.102: icmp_seq=4 ttl=64 time=1.71 ms
64 bytes from 192.168.111.102: icmp_seq=5 ttl=64 time=2.63 ms
^C
--- 192.168.111.102 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4009ms
rtt min/avg/max/mdev = 1.214/1.946/2.634/0.474 ms
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