Date: Fri, 1 Dec 2000 15:32:48 -0500 (EST) From: Joe Oliveiro <joe@advancewebhosting.com> To: Umesh Krishnaswamy <umesh@juniper.net> Cc: freebsd-security@FreeBSD.ORG Subject: Re: Defeating SYN flood attacks Message-ID: <Pine.BSF.4.21.0012011532250.529-100000@joe.pythonvideo.com> In-Reply-To: <3A27F625.4C87CC7C@juniper.net>
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check your /etc/defaults/rc.conf file for protection against synfloods. FreeBSD - The BEST upgrade you can do to NT! On Fri, 1 Dec 2000, Umesh Krishnaswamy wrote: > Hi Folks, > > I wanted to double-check which version of FreeBSD (if any) can address a > SYN flooding DoS attack. The latest FreeBSD sources (tcp_input.c and > ip_input.c) do not seem to have any code to address such an attack. Maybe I am > missing something. > > So if you folks can enlighten me on whether or how to handle the SYN attack from > within the kernel, I would appreciate it. I am aware of ingress filtering; while > that can help attacks from randomized IP addresses, it will fail in the case of > an attack from a spoofed trusted IP address. Hence the desire to look into the > kernel for a fix. > > Thanks. > Umesh. > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-security" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-security" in the body of the message
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