tcpdump --diagnose

SYN Cookie Checker

Companion to SYN flood detection lies to you on a SYN-cookie kernel. Paste output below, nothing leaves your browser.

Commands to gather this

sysctl net.ipv4.tcp_syncookies
ss -tn state syn-recv | wc -l
cat /proc/sys/net/ipv4/tcp_max_syn_backlog