Messages in this thread | | | Date | Mon, 29 Jun 2009 15:48:51 +0200 | From | Patrick McHardy <> | Subject | Re: [PATCH] gre: copy ToS/DiffServ bits to outer IP header |
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Andreas Jaggi wrote: > When tunneling IP traffic with GRE this patch makes it possible to > export the ToS/DiffServ information to the outer IP header. > This is particularly useful in a scenario with ESP/AH where the inner IP > header is encrypted but the packet priority/DiffServ information > should still be respected by the transporting routers (for example in an > MPLS backbone network). > > The feature is disabled by default and can be enabled on a per-interface > basis (/proc/sys/net/ipv4/conf/ethX/gre_copy_tos). > > Also does this bring Linux back in the game, as JunOS/IOS provide this > for quite some time: > http://www.cisco.com/en/US/docs/ios/11_3/feature/guide/greqos.html > http://www.juniper.net/techpubs/software/junos/junos94/swconfig-services/configuring-a-gre-tunnel-to-copy-tos-bits-to-the-outer-ip-header.html > > > Signed-off-by: Andreas Jaggi <aj@open.ch> > > diff -urN vanilla-linux-2.6.29.4/include/linux/sysctl.h > gre-copy-tos/include/linux/sysctl.h > --- vanilla-linux-2.6.29.4/include/linux/sysctl.h 2009-05-19 > 01:52:34.000000000 +0200 > +++ gre-copy-tos/include/linux/sysctl.h 2009-06-29 14:23:07.000000000 > +0200 > @@ -490,6 +490,7 @@ > NET_IPV4_CONF_ARP_IGNORE=19, > NET_IPV4_CONF_PROMOTE_SECONDARIES=20, > NET_IPV4_CONF_ARP_ACCEPT=21, > + NET_IPV4_CONF_GRE_COPY_TOS=22,
Please add this to the rtnl_link interface instead of using sysctls.
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