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Hi, Thanks for suggestion. I Agree. As mentioned earlier, i'm facing this problem while IPv6 TCP SYN flood attack but not facing while IPv4 TCP syn flood attack. Actually, I have requirement as legitimate users should able to access our device while there is TCP SYN Flood attack. I'm trying...

Hi, Thanks for reply. According to these shared articles v4.19 also, SYN Cookie have support for IPv6. But, didn't get information about verification/testing performed on IPv6 with SYN Cookie for TCPv6 SYN Flood protection. As mentioned initial post, i have below observation which seems this...

Is there any drawback/limitation at syncookie implementation for ipv6 ? Because, current I'm using Linux 4.19 & syncookie enabled as net.ipv4.tcp_syncookies=1 Used netwox tool for simulate TCP synflood for ipv4/ipv6. Didn't observe any issue for ipv4. But, observed cpu% for si hits spike for...