我在我的osx机器上通过VirtualBox创build了一个Ubuntu-16.04虚拟机。 我正在使用2个networking适配器： Bridged Adapter [en0: Wi-Fi (Airport)]和Host-only Adapter (vboxnet0) 。
这是来自2台机器的ifconfig o / p，首先是osx：
en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 3c:15:c2:c8:27:d0 inet 192.168.1.5 netmask 0xffffff00 broadcast 192.168.1.255 media: autoselect status: active bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 options=63<RXCSUM,TXCSUM,TSO4,TSO6> ether 3e:15:c2:8c:a2:00 Configuration: id 0:0:0:0:0:0 priority 0 hellotime 0 fwddelay 0 maxage 0 holdcnt 0 proto stp maxaddr 100 timeout 1200 root id 0:0:0:0:0:0 priority 0 ifcost 0 port 0 ipfilter disabled flags 0x2 member: en1 flags=3<LEARNING,DISCOVER> ifmaxaddr 0 port 5 priority 0 path cost 0 member: en2 flags=3<LEARNING,DISCOVER> ifmaxaddr 0 port 6 priority 0 path cost 0 media: <unknown type> status: inactive vboxnet0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 ether 0a:00:27:00:00:00 inet 192.168.56.1 netmask 0xffffff00 broadcast 192.168.56.255
Ubuntu下一个：
enp0s3 Link encap:Ethernet HWaddr 08:00:27:7a:ba:0d inet addr:192.168.1.2 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::f296:f0:610e:2b37/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:8596 errors:0 dropped:0 overruns:0 frame:0 TX packets:7017 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:7956786 (7.9 MB) TX bytes:945469 (945.4 KB) enp0s8 Link encap:Ethernet HWaddr 08:00:27:b6:c9:6e inet addr:192.168.56.101 Bcast:192.168.56.255 Mask:255.255.255.0 inet6 addr: fe80::ba63:3f0e:321:ee37/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:35 errors:0 dropped:0 overruns:0 frame:0 TX packets:66 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3864 (3.8 KB) TX bytes:7966 (7.9 KB) 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:1065 errors:0 dropped:0 overruns:0 frame:0 TX packets:1065 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:100747 (100.7 KB) TX bytes:100747 (100.7 KB)
我无法从ubuntu ping通osx：
$ ping 192.168.1.5 PING 192.168.1.5 (192.168.1.5) 56(84) bytes of data. ^C --- 192.168.1.5 ping statistics --- 480 packets transmitted, 0 received, 100% packet loss, time 490401ms
但是我可以从osx ping ubuntu（guest）。 我怎样才能解决这个问题？
Note: Firewall is disabled on both the machines
我只是在两台机器上都运行tcpdumps，这是Guest（Ubuntu）的输出：
inet 127.0.0.1 netmask 0xff000000 $ sudo tcpdump -nni any dst host 192.168.1.5 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes 07:18:46.141730 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1992, seq 1, length 64 07:18:47.156510 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1992, seq 2, length 64 07:18:48.179200 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1992, seq 3, length 64 07:18:49.203053 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1992, seq 4, length 64 07:18:50.227545 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1992, seq 5, length 64 07:18:51.251328 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1992, seq 6, length 64 07:18:51.316782 ARP, Request who-has 192.168.1.5 tell 192.168.1.2, length 28 $ sudo tcpdump -nni any src host 192.168.1.5 tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on any, link-type LINUX_SLL (Linux cooked), capture size 262144 bytes 07:19:43.027612 ARP, Reply 192.168.1.5 is-at 3c:15:c2:c8:27:d0, length 46 07:20:25.011455 ARP, Reply 192.168.1.5 is-at 3c:15:c2:c8:27:d0, length 46 ^C 2 packets captured 2 packets received by filter 0 packets dropped by kernel
并在主机（osx）上：
$ sudo tcpdump -nni any icmp tcpdump: data link type PKTAP tcpdump: verbose output suppressed, use -v or -vv for full protocol decode listening on any, link-type PKTAP (Packet Tap), capture size 65535 bytes 07:59:37.858801 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1941, seq 6, length 64 07:59:38.882701 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1941, seq 7, length 64 07:59:39.905794 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1941, seq 8, length 64 07:59:40.928857 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1941, seq 9, length 64 07:59:41.953113 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1941, seq 10, length 64 07:59:42.975912 IP 192.168.1.2 > 192.168.1.5: ICMP echo request, id 1941, seq 11, length 64
这意味着主机确实正在接收来自客户端的ping请求，但没有响应它们？
您是否尝试过closuresOS X防火墙？ 或者至less确保如下所示未启用“启用隐藏模式”（系统偏好设置>安全和隐私>防火墙>防火墙选项…）。 它为我工作，但我没有设置第二个networking适配器。 我只设置了一个桥接适配器。
启用隐形模式