编辑/proc/sys/net/ipv4/ip_forward

[root@sre01 ~]# cat /proc/sys/net/ipv4/ip_forward
0
[root@sre01 ~]# echo 1 > /proc/sys/net/ipv4/ip_forward

[root@sre01 ~]# cat /proc/sys/net/ipv4/ip_forward
1