在這里只說明我遇到的問題和解決方法，可能並不能解決你遇到的問題：
git clone git@gitlab.alpha.com:ipcam/ambarella.git
Cloning into 'ambarella'...
ssh: connect to host gitlab.alpha.com port 22: Network is unreachable
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
1、檢查網絡是否可以ping 通
ping xxx.xxx.xxx.xxx
2、查看/etc/network/interfaces
address 一欄和要下載的code server是否在同一網段
3、不在同一網段添加路由
sudo route add default gw xxx.xxx.xxx.xxx