Hey, I just pushed a fix that will disable IPv6 immediately and reinstate the disable-ipv6 file. This should take care of the current situation for people with the support pack. So far my testing has revealed no adverse effects.
Anybody any idea why IPv6 support is enabled by the cloud support pack? What about distribution of the support pack, it is currently available from downloads.cloud.com, how do we deal with this in release 4.0? Cheers, Hugo -----Original Message----- From: Chip Childers [mailto:chip.child...@sungard.com] Sent: Monday, July 30, 2012 5:11 PM To: cloudstack-dev@incubator.apache.org Subject: Re: Disable IPv6 for systemvm Indeed - I'm testing in an advanced networking zone, so we didn't bother doing the support pack installation. That would be the difference. I think your scripts will work, excluding the error condition that my environment introduces. IMO - if that pack isn't required, then we should expect to see environments like the one I'm using right now. -chip On Mon, Jul 30, 2012 at 11:07 AM, Hugo Trippaers <htrippa...@schubergphilis.com> wrote: > Hey Chip, > > Think I found it. Do you have the cloud support pack > (http://download.cloud.com/releases/3.0.1/XS-6.0.2/xenserver-cloud-supp.tgz ) > installed? My guess is you don't. > > During the firstboot of xen the file " /etc/modprobe.d/disable-ipv6" is > removed by that pack. This enables IPv6, which is indeed disabled by default > by XenServer. > > We (or actually the Cloudstack basic install guide) actively promotes that > this should be installed to enable security groups. > > Cheers, > > Hugo > > -----Original Message----- > From: Chip Childers [mailto:chip.child...@sungard.com] > Sent: Monday, July 30, 2012 4:57 PM > To: cloudstack-dev@incubator.apache.org > Subject: Re: Disable IPv6 for systemvm > > Looks like we are using the same version, but different configuration?: > > # uname -a > Linux xshost2 2.6.32.12-0.7.1.xs6.0.2.542.170665xen #1 SMP Tue Jan 17 > 15:14:24 EST 2012 i686 i686 i386 GNU/Linux > > # cat /etc/redhat-release > XenServer release 6.0.2-53456p (xenenterprise) > > # ls /proc/sys/net/ipv6/conf/all/autoconf > ls: /proc/sys/net/ipv6/conf/all/autoconf: No such file or directory > > I can't get a simpel ipv6 table list, because the protocol # ip6tables -L > ip6tables v1.3.5: can't initialize ip6tables table `filter': Address family > not supported by protocol Perhaps ip6tables or your kernel needs to be > upgraded. > > The ip6tables commands will fail with the above error if it's not enabled. > Other than that, I think the script would work (if v6 is enabled on the host). > > On Mon, Jul 30, 2012 at 10:44 AM, Hugo Trippaers > <htrippa...@schubergphilis.com> wrote: >> Hey Chip, >> >> Interesting, which version are you using? >> >> My box: >> Linux XXXXXX 2.6.32.12-0.7.1.xs6.0.2.542.170665xen #1 SMP Tue Jan 17 >> 15:14:24 EST 2012 i686 i686 i386 GNU/Linux [root@XXXXX ~]# cat >> /etc/redhat-release XenServer release 6.0.2-53456p (xenenterprise) >> [root@XXXXX ~]# ls /proc/sys/net/ipv6/conf/all/autoconf >> /proc/sys/net/ipv6/conf/all/autoconf >> [root@XXXXX ~]# cat /proc/sys/net/ipv6/conf/all/autoconf >> 1 >> >> Btw I plan to add this to setupxenserver.sh: >> # setup ip6tables >> if [ -x "/sbin/ip6tables" ] ; then >> /sbin/ip6tables -P INPUT DROP >> /sbin/ip6tables -P OUTPUT DROP >> /sbin/ip6tables -P FORWARD DROP >> if [ -x "/etc/init.d/ip6tables" ] ; then >> /etc/init.d/ip6tables save >> fi >> fi >> >> # disable IPv6 >> if [ -d "/proc/sys/net/ipv6/conf/all" ] ; then >> /sbin/sysctl -w net.ipv6.conf.all.forwarding=0 >> /sbin/sysctl -w net.ipv6.conf.all.accept_ra=0 >> /sbin/sysctl -w net.ipv6.conf.all.accept_redirects=0 >> /sbin/sysctl -w net.ipv6.conf.all.autoconf=0 >> /sbin/sysctl -w net.ipv6.conf.all.disable_ipv6=1 fi >> >> Cheers, >> >> Hugo >> >> -----Original Message----- >> From: Chip Childers [mailto:chip.child...@sungard.com] >> Sent: Monday, July 30, 2012 4:06 PM >> To: <cloudstack-dev@incubator.apache.org> >> Subject: Re: Disable IPv6 for systemvm >> >> The latest Xen Server install seems to have IPv6 disabled (just checked in >> my lab). Is it enabled in XCP? >> >> (I may be showing my Xen ignorance here) >> >> - chip >> >> On Jul 30, 2012, at 9:24 AM, Hugo Trippaers <htrippa...@schubergphilis.com> >> wrote: >> >>> Hey Chip, >>> >>> Yeah, I want help :-) >>> >>> I just committed the sysctl.conf changes for the systemvm. This morning i >>> applied them to my test environment and they do the job. >>> >>> We could add the actual sysctl command to the vmops next to adding the IPv6 >>> ip6tables statements I think. >>> >>> Cheers, >>> >>> Hugo >>> >>> >>> -----Original Message----- >>> From: Chip Childers [mailto:chip.child...@sungard.com] >>> Sent: Monday, July 30, 2012 3:13 PM >>> To: cloudstack-dev@incubator.apache.org >>> Subject: Re: Disable IPv6 for systemvm >>> >>> On Mon, Jul 30, 2012 at 7:32 AM, Hugo Trippaers >>> <htrippa...@schubergphilis.com> wrote: >>>> By the way, we might want to add the same configuration to vmops for >>>> XenServer. >>>> >>>> Currently it is possible to have a tenant vm send a router advertisement >>>> on the isolated lan that is picked up by XenServer. Even though XenServer >>>> only has a bridge interface in the tenant lan that interface will be >>>> autoconfigured. A simple ping to the local all-node address (ff02::1) will >>>> tell you the mac off of the XenServer interface. As XenServer has ssh >>>> active on all interfaces you can directly connect to the ssh daemon on the >>>> XenServer. We only push a IPv4 firewall to the XenServer so the IPv6 >>>> firewall is default (ACCEPT everything). >>>> >>>> Still you only gain access to the ssh port, but that is something that >>>> should not be possible from a tenant lan. >>>> >>>> Cheers, >>>> >>>> Hugo >>> >>> As a provider, this one is even more concerning. Unless someone has an >>> objection, I'd agree with your solution. We can remove a DENY rule in the >>> future, after IPv6 support is added properly / completely. >>> >>> If you want help working up the fix for this, please let me know! >>> >>> -chip >>> >> >
