Re: Firewalling non-IPsec connections

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On Wed, Dec 17, 2003 at 11:02:35PM +0100, Peter Hoeg wrote:
> Mark Weaver wrote:
> 
> >I have to guess so.  I've no idea TBH where the packets actually go, but
> >this definitely works for me.  I'm more of a cook than a chef when it comes
> >to netfilter.  I've tried looking around the source, but I'm pretty
> >clueless, and the native ipsec doesn't seem to be documented at all.  It's
> >not even got a maintainer listed, and virtually nothing in
> >linux/Documentation.  (If anyone could point me in the right direction that
> >would be great!).

> mark, you simply rule! this fixed my problem. now, since i was going 
> nuts trying to figure it out and i couldn't find ANY info on ANYWHERE 
> (you guys were my last resort), so i have decided to make a small guide 
> (i needed to learn docbook anyway so this seemed like a good chance) 
> which can be found here:

> http://hoeg.org/lri/

> but one thing - to be honest i actually was thinking briefly about the 
> MARK solution myself but came to the conclusion that since it is similar 
> to the TOS marks you can set, then technically somebody else could tag 
> the packets themselves before entering my system which would bypass the 
> solution. and thats why i didnt take it further. can anybody shed any 
> light on that?

	No...  TOS is contained in the packet.  It's actually a header
field.  MARK is not.  It's not a part of the packet at all outside of the
system.  It can not be introduced from outside the system.

> but in order for the search engines to pick up this message: racoon 
> linux kernel 2.6 ipsec vpn tunnel firewall iptables netfilter

> >It kind of makes sense, because without this we'd have no possibility of
> >handling packets that came in via an IPSC tunnel separately.

> agree

	Mike
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