/proc/sys/net/ipv4/ip_forward set to 1 when install and start docker

[willzhang]

why /proc/sys/net/ipv4/ip_forward set to 1 when install and start docker,any dos for this ?what it mean?

[root@iZj6cetbb1qeqfstcehc34Z ~]# cat /proc/sys/net/ipv4/ip_forward                                                            
0
[root@iZj6cetbb1qeqfstcehc34Z ~]# 
[root@iZj6cetbb1qeqfstcehc34Z ~]# systemctl start docker
[root@iZj6cetbb1qeqfstcehc34Z ~]# cat /proc/sys/net/ipv4/ip_forward
1

[kai-cool-dev]

How should Docker handle networking when it can't forward packets?

[andrewhsu]

Docker needs to setup ip forwarding to function when doing networking. Docs for some more info.