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Steps to reduce SYN Attacks
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1. Enable syn-cookies (prevent syn-flood attacks):

echo "1" >/proc/sys/net/ipv4/tcp_syncookies

2. Reduce number of possible SYN Floods:

echo "1024" >/proc/sys/net/ipv4/tcp_max_syn_backlog

3. Limit SYN connections using Iptables ( Adjust the limit as 5/s or 10/s )

iptables -A INPUT -p tcp --syn -m limit --limit 5/s -i eth0 -j ACCEPT

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