On 07/26/2013 01:39 AM, Christophe Ségui wrote: > Another (important detail) : Setup is working when client node try to > reach a web server located in netB but not for an internet web > server.... routefilter=0 and logmartians=0 options are set for FW > interface on netB
If you want selective route filtering, then you want ROUTE_FILTER=No in
shorewall.conf. The effective setting for each interface is the
*maximum* of the setting for that interface
(/proc/sys/net/ipv4/<interface>/rp_filter) and the all setting
(/proc/sys/net/ipv4/all/rp_filter). From The
Documentation/networking/ip-sysctl file:
rp_filter - INTEGER
0 - No source validation.
1 - Strict mode as defined in RFC3704 Strict Reverse Path
Each incoming packet is tested against the FIB and if the
interface
is not the best reverse path the packet check will fail.
By default failed packets are discarded.
2 - Loose mode as defined in RFC3704 Loose Reverse Path
Each incoming packet's source address is also tested against
the FIB
and if the source address is not reachable via any interface
the packet check will fail.
Current recommended practice in RFC3704 is to enable strict mode
to prevent IP spoofing from DDos attacks. If using asymmetric
routing
or other complicated routing, then loose mode is recommended.
The max value from conf/{all,interface}/rp_filter is used
when doing source validation on the {interface}.
Default value is 0. Note that some distributions enable it
in startup scripts.
Note that Debian is one of those distributions.
I'll try to make this clearer in the Shorewall documentation.
-Tom
--
Tom Eastep \ When I die, I want to go like my Grandfather who
Shoreline, \ died peacefully in his sleep. Not screaming like
Washington, USA \ all of the passengers in his car
http://shorewall.net \________________________________________________
signature.asc
Description: OpenPGP digital signature
------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk
_______________________________________________ Shorewall-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/shorewall-users
