i want to change nf_conntrack_max value....

i have search in google. i find out that to change the value of nf_conntrack_max ...

/sbin/sysctl -w net.netfilter.nf_conntrack_max = 196608

but its give me error...

Code:
[root@manage /root]# /sbin/sysctl -w net.netfilter.nf_conntrack_max = 196608
error: "net.netfilter.nf_conntrack_max" must be of the form name=value
error: Malformed setting "="
error: "196608" must be of the form name=value

please tell me how to change value of max conntrack ....