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
Maintained by the ILUG website team. The aim of Linux.ie is to
support and help commercial and private users of Linux in Ireland. You can
display ILUG news in your own webpages, read backend
information to find out how. Networking services kindly provided by HEAnet, server kindly donated by
Dell. Linux is a trademark of Linus Torvalds,
used with permission. No penguins were harmed in the production or maintenance
of this highly praised website. Looking for the
Indian Linux Users' Group? Try here. If you've read all this and aren't a lawyer: you should be!