Hi,
新安装的系统，我尝试修改网络。但networking restart一直处于失效状态，但是我reboot之后他就可以使用。
排查了一下原因发现ifdown -v ethx 的时候发现 ip addr del ip/mask删除的不是老的地址，而是新的地址。所以在networking restart之后 他只是新加/etc/network/interfaces中的新的ip地址。ip addr 发现他们两是并存的状态。
#ifconfig eth3
eth3: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 172.16.1.20
#cat /etc/network/interfaces
auto eth3
iface eth3 inet static
address 172.16.1.16
netmask 255.255.255.0
#ifdown -v eth3 #他删除的是新interfaces配置中的网络，而不是老的网络。
我的临时修复方案是：
# cat fix-network.sh
#!/bin/bash
/etc/init.d/networking stop
$(ip addr|grep inet|grep -v 127.0.0.1|awk '{printf "ip addr del %s dev %s\n", $2,$NF}')
/etc/init.d/networking start
#ifup eth0
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google translation
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Newly installed system, I tried to modify the network. But networking restart has been in a failed state, but I can use it after reboot.
Troubleshoot the reasons for finding ifdown -v ethx found ip addr del ip / mask deleted is not the old address, but the new address. So in the closed restart he just added / etc / network / interfaces in the new ip address. Ip addr found that they both coexist the state.
#ifconfig eth3
Eth3: flags = 4099 <UP, BROADCAST, MULTICAST> mtu 1500
Inet 172.16.1.20
#cat / etc / network / interfaces
Auto eth3
Iface eth3 inet static
Address 172.16.1.16
Netmask 255.255.255.0
#ifdown -v eth3 # He deleted the network in the new interfaces configuration, not the old network.
My temporary fix is:
## cat fix-network.sh
#! / Bin / bash
/etc/init.d/networking stop
$ (Ip addr | grep inet | grep -v 127.0.0.1 | awk '{printf "ip addr del% s dev% s \ n", $ 2, $ NF}')
/etc/init.d/networking start
#ifup eth0