2019-01-02 ssh: connect to host xx.xxx.xxx.xx port 22: Can't assign requested address

今天碰到問題，mac休眠重新點亮後，首先是VPN連接不到服務器，再試一下SSH服務器，提示：

Anthonys-MacBook-Pro-2:~ anthony$ ssh xx.xxx.xxx.xx
ssh: connect to host xx.xxx.xxx.xx port 22: Can't assign requested address

直接點wifi圖標先禁用再啓用不起作用，需要在終端下，先用ifconfig看下網卡名稱叫en0，然後手工重啓網卡，刷新路由表：

Anthonys-MacBook-Pro-2:~ anthony$ sudo ifconfig en0 down
Password:
Anthonys-MacBook-Pro-2:~ anthony$ sudo route flush
xx.xxx.xxx.xx        10.84.80.1           done
route: write to routing socket: No such process
got only -1 for rlen
Anthonys-MacBook-Pro-2:~ anthony$ sudo ifconfig en0 up
Anthonys-MacBook-Pro-2:~ anthony$ ssh xx.xxx.xxx.xx
Welcome to Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-43-generic x86_64)
....

正常了，記錄備查

^_