Thanks all for your comments.
Now I have a clear vision for what to do and what to use.
Regards,
Xavier C.
Daniel Cid wrote:
Your Linux box running snort in inline mode can't be considered a
firewall. By the default, snort-inline allows everything and only
block what it detects as "wrong". You BSD firewall should block
everything and only allow what is necessary on your network.
It's two different devices doing different things. Do not expect your
IDS (snort inline is basically an IDS with a blocking response) to do
what
your firewall should be doing.
Daniel
Xavier Cabrera wrote:
Hello:
Thanks for all your answers. Wel i think too the best aproach for
this is doing on iptables like Will say.. but if we really want a IPS
with snort maybe we can start to think on that solution. Maybe people
of sourcefire can plant this solution for future releases.
If snort in future can handle the connections with syn proxy or
(seudo syn proxy) validating the real one's before they can pass can
start to think in the best IPS of the World
Well, i have to continue with my two boxes.... Like Matt say... right
now i have a Linux-Snorted behind a BSD.... and that is not
elegant.... A firewall behind another one?
Regards
Xavier Cabrera.
Will Metcalf wrote:
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.
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