手动配置网关，解决VMWare虚拟机内可以访问主机但无法访问互联网的问题

常常都被虚拟机的网络折腾得颠三倒四，做点笔记吧。

问题：选择NAT后并配置好IP和NetMask之后，可以ping通主机，但连不通Internet。

解决：手动配置默认网关。

步骤：

1. 在虚拟网络编辑器里，找到网关配置，这里是192.168.171.2 。

   

2. 在虚拟机设置里，确认选择NAT。

   

3. IP和NetMask已经配置：

   [root@localhost ~]# ifconfig ens33
   ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
           inet 192.168.171.128  netmask 255.255.255.0  broadcast 192.168.171.255
           inet6 fe80::20c:29ff:feba:ba7c  prefixlen 64  scopeid 0x20<link>
           ether 00:0c:29:ba:ba:7c  txqueuelen 1000  (Ethernet)
           RX packets 281023  bytes 361357640 (344.6 MiB)
           RX errors 0  dropped 0  overruns 0  frame 0
           TX packets 68897  bytes 14016800 (13.3 MiB)
           TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
   

4. 可以Ping通主机，但无法连接Internet：

   [root@localhost ~]# ping 192.168.171.1
   PING 192.168.171.1 (192.168.171.1) 56(84) bytes of data.
   64 bytes from 192.168.171.1: icmp_seq=1 ttl=128 time=0.416 ms
   64 bytes from 192.168.171.1: icmp_seq=2 ttl=128 time=0.318 ms
   64 bytes from 192.168.171.1: icmp_seq=3 ttl=128 time=0.348 ms
   64 bytes from 192.168.171.1: icmp_seq=4 ttl=128 time=0.262 ms
   ^C
   --- 192.168.171.1 ping statistics ---
   4 packets transmitted, 4 received, 0% packet loss, time 3001ms
   rtt min/avg/max/mdev = 0.262/0.336/0.416/0.055 ms
   [root@localhost ~]# ping 8.8.8.8
   connect: Network is unreachable

5. 检查路由表：

   [root@localhost ~]# netstat -nr
   Kernel IP routing table
   Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
   192.168.122.0   0.0.0.0         255.255.255.0   U         0 0          0 virbr0
   192.168.171.0   0.0.0.0         255.255.255.0   U         0 0          0 ens33

6. 手动添加网关：

   [root@localhost ~]# route add default gw 192.168.171.2
   [root@localhost ~]# netstat -nr
   Kernel IP routing table
   Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
   0.0.0.0         192.168.171.2   0.0.0.0         UG        0 0          0 ens33
   192.168.122.0   0.0.0.0         255.255.255.0   U         0 0          0 virbr0
   192.168.171.0   0.0.0.0         255.255.255.0   U         0 0          0 ens33

7. 再次尝试：

   [root@localhost ~]# ping 8.8.8.8
   PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
   64 bytes from 8.8.8.8: icmp_seq=1 ttl=128 time=23.4 ms
   64 bytes from 8.8.8.8: icmp_seq=2 ttl=128 time=26.5 ms
   64 bytes from 8.8.8.8: icmp_seq=3 ttl=128 time=22.5 ms
   64 bytes from 8.8.8.8: icmp_seq=4 ttl=128 time=29.2 ms
   ^C
   --- 8.8.8.8 ping statistics ---
   4 packets transmitted, 4 received, 0% packet loss, time 3007ms
   rtt min/avg/max/mdev = 22.524/25.448/29.255/2.666 ms

8. 删除刚刚添加的网关，重现之前的错误：

   [root@localhost ~]# route del default gw 192.168.171.2
   [root@localhost ~]# netstat -nr
   Kernel IP routing table
   Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
   192.168.122.0   0.0.0.0         255.255.255.0   U         0 0          0 virbr0
   192.168.171.0   0.0.0.0         255.255.255.0   U         0 0          0 ens33
   [root@localhost ~]# ping 8.8.8.8
   connect: Network is unreachable

参考链接：

https://www.freebsd.org/doc/h...
https://unix.stackexchange.co...