On Wednesday 04 January 2012 12:17:18 Jan Engelhardt wrote: > On Wednesday 2012-01-04 11:18, Hans Schillstrom wrote: > > >On Wednesday 04 January 2012 10:03:49 Jozsef Kadlecsik wrote: > >> On Wed, 4 Jan 2012, Hans Schillstrom wrote: > >> > >> > On Wednesday 04 January 2012 09:28:05 Jozsef Kadlecsik wrote: > >> > > > >> > > On Wed, 4 Jan 2012, Hans Schillstrom wrote: > >> > > > >> > > > In some cases it not desirable to have auto defrag. > >> > > > Ex. in a cluster where packets can arrive on different blades. > >> > > > In that case it is possible to use containers (LXC) and send > >> > > > all fragments to one place where defrag is enabled. > >> > > > > >> > > > This patch makes it possible to turn off the defrag per network name space, > >> > > > by setting net.netfilter.nf_conntrack_nodefrag to 1. > >> > > > Both IPv4 and IPv6 is effected by this sysctl. > >> > > > Default is 0 which is defrag. > >> > > > >> > > Conntrack assumes that the packets are defragmented and will drop any > >> > > unfragmented one. So your patch results packet drops. > >> > > >> > Hmmm, more work... > >> > > > >> > > Also, if you want to disable defragmentation then why don't you simply > >> > > "mark" the packets with the NOTRACK target? > >> > > >> > I don't think that will work since NF_IP_PRI_CONNTRACK_DEFRAG is -400 > >> > >> Then change NF_IP_PRI_RAW so that it precedes NF_IP_PRI_CONNTRACK_DEFRAG. > >> The raw table should be made possible to completely override conntack and > >> defrag is implicit part of the latter. > >> > > > >An other idea, turn off both conntrack and defrag > >i.e. do like NOTRAC and rename the flag ? > > Or just add a new table - that one we can remove/stash > when I get my xt2 patches out. > I like that idea, an "early" table at prio -500 with PREROUTING. There is also a need for a new flag "--allfrags" i.e. all fragments needs to be sorted out and sent to same dest for defrag. ex. iptables -t early -A PREROUTING -i eth0 --allfrags -j NOTRACK -- Regards Hans Schillstrom <hans.schillstrom@xxxxxxxxxxxx> -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
