[Olsr-dev] Asymmetric ipip not working

Sven-Ola Tuecke (spam-protected)
Mon Apr 26 09:58:34 CEST 2010


hhm. dunno yet. I don't think that adding iptables-functions to olsrd is a 
good thing. A routing daemon should not fiddle to much with the system 
besides routing tables IMO.

Besides that: the rp_filter stuff is getting nasty. As I wrote, the 
itunl0.rp_filter=0 is required on 2.6.31. There's already a query in 
linux/net.c, some "if is_at_least_linuxkernel_2_6_31". On 2.6.30 there is a 
tunl0.rp_filter file, but on 2.6.18 (my XEN based gateway server) does not 
offer rp_filter for the ipip tunnel device. Same on 2.4.30...


// Sven-Ola

Am Montag 26 April 2010 09:25:50 schrieb Henning Rogge:
> On Mon April 26 2010 08:57:27 Sven-Ola Tuecke wrote:
> > And one more: I need to re-check the security implications. Suppose you
> > do a telnet which is encapsulated in ipip or something similar.
> > Your firewall may be surprised (even if that simple telnet does not
> > work)...
> Maybe there should be an additional firewall rule for traffic coming out of
> the generic tunnel-endpoint to block this ?
> Henning Rogge

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