It was fixed in CSS and CSGO few years ago, so you shouldn't need this:
Code:
] find queries
"sv_max_queries_sec" = "3.0"
- Maximum queries per second to respond to from a single IP address.
"sv_max_queries_window" = "30"
- Window over which to average queries per second averages.
"sv_max_queries_sec_global" = "3000"
- Maximum queries per second to respond to from anywhere.
"sv_enableoldqueries" = "0"
- Enable support for old style (HL1) server queries
In CSGO probably you can change this with sm_cvar