Re: IPSec, netfilter, and virtual interfaces

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H. Peter Anvin <hpa@zytor.com> wrote:
> 
> The Linux 2.6 ipsec code gets rid of virtual interfaces for IPSec.
> This is clearly The Right Thing for transport mode or AH, but it
> increasingly seems to me that it's The Wrong Thing for tunnel-mode
> ESP.

I'm sorry but you're mistaken.  You would've encountered exactly
the same problem under KLIPS.
 
> I know there is work underway to deal with the netfilter issue, but
> the routing/address selection issue also seems like a problem.  How
> should this be dealt with?

This is an issue that the KM (e.g., openswan) should deal with
by adding a route with the appropriate source address.  In fact,
openswan already deals with it.  What you want to do is set
leftsourceip/rightsourceip.  Unfortunately this isn't currently
documented in ipsec.conf.5.

If you have a moment please send a patch to dev@lists.openswan.org
and document this feature.

BTW, for issues like this you should also post to users@lists.openswan.org.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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