Many scripts that will be shown here are no longer correct.
http://wiki.mikrotik.com/wiki/DoS_attack_protection
Can someone help me to correct them.

Protection
Limit incoming connections
An IP address with too many connections can be added to a 'black-list' type address list for further blocking.

/ip firewall filter add chain=input protocol=tcp connection-limit=LIMIT,32 \
action=add-src-to-address-list address-list=blocked-addr address-list-timeout=1d

This is not correct a copy and paste this and see what error i have

If I understood right,
"LIMIT" has to be a numbers.
Wiki says: "LIMIT should be a value of 100 or..."

I have over looked.Thanks for your reply.
SOLVED