Not netfilter, but directly in the kernel
echo 1> /proc/sys/net/ipv4/tcp_syncookies
But it's usually activated by default. Are you sure it's just syn flooding or a full TCP connection but no query within ?
On 29/10/10 09:12, Ciaran Johnston wrote:
> Hi folks,
> has anyone any iptables magic which will protect a server from a SYN flood
> on port 80 (apparrently random source IPs) while allowing real traffic
> through?
>> Thanks,
> Ciaran
>>
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