Re: SYN Proxy

[Will Metcalf <william.metcalf () gmail com>]

I could think of a way to do this, it probably wouldn't be very clean
and would more than likely require an ip stack to be loaded on your
inline box.

This is really something that should be handled in netfilter rather
than in snort-inline.  If packets make it to the queue and you have a
lot of spoofed packets your DoS isn't going to be on the end host your
trying to protect, it's going to be your inline box dealing with all
the damn context switching between user space and kernel space.

Regards,

Will

On 7/19/05, Matt Kettler <mkettler () evi-inc com> wrote:
> Xavier Cabrera wrote:
> > Anyone know how snort can work like a Syn Proxy in inline mode?
>
> Not that I'm aware of.. Ultimately I think you'll have to do this in two stages,
> something like this:
>
> PC -> syn proxy -> snort inline -> Internet
>
> You might be able to wrap it all up on the same box by using two interfaces and
> have the proxy tool running on the inside interface, and then inline snort on
> the outside.
>
>
> Something like this:
>
> inside interface ->syn proxy -> OS routing -> snort inline -> outside interface
>
>
>
> but I'm not up-to-speed on all the syn proxy tools out there, or snort's current
> inline support.
>
>
> -------------------------------------------------------
> SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
> from IBM. Find simple to follow Roadmaps, straightforward articles,
> informative Webcasts and more! Get everything you need to get up to
> speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click
> _______________________________________________
> Snort-users mailing list
> Snort-users () lists sourceforge net
> Go to this URL to change user options or unsubscribe:
> https://lists.sourceforge.net/lists/listinfo/snort-users
> Snort-users list archive:
> http://www.geocrawler.com/redir-sf.php3?list=snort-users


-------------------------------------------------------
SF.Net email is sponsored by: Discover Easy Linux Migration Strategies
from IBM. Find simple to follow Roadmaps, straightforward articles,
informative Webcasts and more! Get everything you need to get up to
speed, fast. http://ads.osdn.com/?ad_idt77&alloc_id492&op=click
_______________________________________________
Snort-users mailing list
Snort-users () lists sourceforge net
Go to this URL to change user options or unsubscribe:
https://lists.sourceforge.net/lists/listinfo/snort-users
Snort-users list archive:
http://www.geocrawler.com/redir-sf.php3?list=snort-users