# Disabled IPV6 and 802.1Q VLANs

**URL:** <https://forum.opennebula.io/t/disabled-ipv6-and-802-1q-vlans/5283>\
**Category:** Product Support\
**Created:** [November 17, 2017, 9:27pm UTC](https://forum.opennebula.io/t/disabled-ipv6-and-802-1q-vlans/5283 "2017-11-17T21:27:18Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![rvalle](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/rvalle/32/6267_2.png) [@rvalle](https://forum.opennebula.io/u/rvalle)\
**Post date:** [November 17, 2017, 9:27pm UTC](https://forum.opennebula.io/t/disabled-ipv6-and-802-1q-vlans/5283/1 "2017-11-17T21:27:18Z")

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Hi!

We don’t use/configure IPV6 so we have it disabled in our servers.

I am trying to setup VLAN based Virtual Networks. I obviously only assign IPV4 addresses.

However when I try to start VMs I get IPV6 error messages:

```auto
Mon Nov 13 06:44:16 2017 [Z0][VMM][I]: ip6tables v1.4.21: can't initialize ip6tables table `filter': Address family not supported by protocol
Mon Nov 13 06:44:16 2017 [Z0][VMM][I]: Perhaps ip6tables or your kernel needs to be upgraded.
Mon Nov 13 06:44:16 2017 [Z0][VMM][E]: post: Command Error: sudo ip6tables -S
Mon Nov 13 06:44:16 2017 [Z0][VMM][E]: post: ["/var/tmp/one/vnm/command.rb:62:in `block in run!'", 

```

My guess is that it is trying to apply default IPV6 rules for when no IPV6 is configured.

However, what can I do if IPV6 is disabled completely?

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**Author:** ![feldsam](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/feldsam/32/4441_2.png) [@feldsam](https://forum.opennebula.io/u/feldsam)\
**Post date:** [November 20, 2017, 8:27pm UTC](https://forum.opennebula.io/t/disabled-ipv6-and-802-1q-vlans/5283/2 "2017-11-20T20:27:46Z")

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Looks like you have to install ip6tables on compute nodes or update vnm driver to not run ip6tables command.

There is no check about network have/not have ipv6 configured in security groups.

> <https://github.com/OpenNebula/one/blob/one-5.4/src/vnm_mad/remotes/lib/security_groups_iptables.rb>

You can open issue on [dev.opennebula.org](http://dev.opennebula.org) or update that file on frontend node and them `onehost sync --force` to update that file (by removing ip6tables cmds) on compute nodes also

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<div class="post-metadata">

**Author:** ![rvalle](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/rvalle/32/6267_2.png) [@rvalle](https://forum.opennebula.io/u/rvalle)\
**Post date:** [November 26, 2017, 5:12pm UTC](https://forum.opennebula.io/t/disabled-ipv6-and-802-1q-vlans/5283/3 "2017-11-26T17:12:11Z")

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ip6tables is installed.

I basically turn off the IPv6 stack by providing a kernel switch at boot time. So, any attempt to deal with ipv6 kernel objects just fails.

I am not experiencing any issues with the BRIDGE network driver.

But the VLAN driver will mess ipv6 tables even if you don’t setup ipv6 addressing.

I will open an issue…

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<div class="post-metadata">

**Author:** ![feldsam](https://yyz1.discourse-cdn.com/flex031/user_avatar/forum.opennebula.io/feldsam/32/4441_2.png) [@feldsam](https://forum.opennebula.io/u/feldsam)\
**Post date:** [November 26, 2017, 5:48pm UTC](https://forum.opennebula.io/t/disabled-ipv6-and-802-1q-vlans/5283/4 "2017-11-26T17:48:00Z")

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Hello, I understand. So you have to temporary update that driver by deleting ip6 sections and open issue on github, because redmine was discontinued few days ago