ipforward [[ipv4 / ipv6] 0 / 1]

[root@sylixos:/root]# help ipforward      
Set/Get IP forward setting
eg. ipforward
    ipforward          (show IP forward setting)
    ipforward 1        (enable IP forward)
    ipforward 0        (disable IP forward)
    ipforward ipv4 1   (enable IPv4 forward)
    ipforward ipv6 0   (disable IPv6 forward)
ipforward [[ipv4 / ipv6] 0 / 1]
[root@sylixos:/root]# 

[root@sylixos:/root]# ipforward
IPv4 forward: Off IPv6 forward: Off
[root@sylixos:/root]# ipforward 1
[root@sylixos:/root]# ipforward
IPv4 forward: On IPv6 forward: On
[root@sylixos:/root]# ipforward ipv4 0
[root@sylixos:/root]# ipforward
IPv4 forward: Off IPv6 forward: On
[root@sylixos:/root]# ipforward ipv6 0
[root@sylixos:/root]# ipforward
IPv4 forward: Off IPv6 forward: Off
[root@sylixos:/root]#