flood attack

hello guys , my server on cs 1.6 getting attacked with flood and hes lagging so much , and i saved logs attack like that : tcpdump -w 0001.pcap udp dst port 27016
if you guys have any solution or iptable to block this shit help me out and thank you :(

first one : http://www.mediafire.com/file/r6smgv...0001.pcap/file
seconds one : http://www.mediafire.com/file/goxyfm...0001.pcap/file