Re: Inline IP_Forwarding and other simple questions?

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

Well said, except that drop does not reset the connection.  Using
reject will drop and reset the connection.

Regards,

Will

On Thu, 23 Dec 2004 15:21:37 -0500, Matt Kettler <mkettler () evi-inc com> wrote:
> At 02:04 PM 12/23/2004, mdpeters wrote:
> > Do I need to enable ip_forwarding on for the transparent bridge to work?
>
> As I understand it, you explicitly MUST NOT enable ip_forwarding, otherwise
> your snort-inline is a "pass all".
>
> > Do I need to install ebtables for inline to disrupt traffic or is
> > iptables, libnet, and libpcap all that I might need?
>
> AFAIK you don't need ebtables.  You do need libipq for inline and libnet.
> This is how snort-inline attaches to iptables by using libipq instead of
> using libpcap.
>
>
> >  It is my impression that iptables just firewalls with static rules.
>
> On it's own, yes, but IPTables is VERY extensible via libipq..
>
> That's where snort-inline comes in. Snort-inline interacts with iptables.
> It doesn't do things like create iptables rules to block packets, it the
> whole system becomes an iptables rule, it just happens to be a rule that
> runs snort instead of some simple expression.
>
>
> > Do the snort rules running on the transparent inline snort box reset the
> > traffic that passes through using inline?
>
> Depends on if you use DROP or SDROP :).. However, inline doesn't JUST reset
> the traffic.. it also prevents the packet from being forwarded at all. DROP
> will also reset, SDROP won't.
>
> Snort 2.3's inline capacity is a direct port of snort-inline. You might
> want to check their FAQ for other info:
>
> http://snort-inline.sourceforge.net/FAQ.html
>
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