Configure IPv6

This was a little painful, it maybe an issue with VBox, teaming, or IPv6. I expect in the EX300 exam simply adding the IPV6ADDR=wxyz.wxyz… and nmcli con reload will work with out any issues. To get this working on my VBox setup took a lot more work and research.

First, here is the configuration of the NAT network.

Next, there was an issue with duplicate local IPv6 addresses. First, I disabled IPv6 on the enp0s8 and enp0s9, then I disabled dad, on both the server and client VMs.

Here are the relevent sections in /etc/sysconfig/network-scrtips/ifcfg-enp0s[8-9]

IPV6INIT=no
IPV6_AUTOCONF=no
IPV6_DEFROUTE=no
IPV6_PEERDNS=no
IPV6_PEERROUTES=no
IPV6_FAILURE_FATAL=no

Then I added this file and contents to disable dad:

# cat /etc/sysctl.d/90-ipv6-disable-dad.conf
net.ipv6.conf.default.optimistic_dad=1
net.ipv6.conf.default.accept_dad=0
net.ipv6.conf.enp0s8.optimistic_dad=1
net.ipv6.conf.enp0s8.accept_dad=0
net.ipv6.conf.enp0s9.optimistic_dad=1
net.ipv6.conf.enp0s9.accept_dad=0
net.ipv6.conf.Team1.optimistic_dad=1
net.ipv6.conf.Team1.accept_dad=0
net.ipv6.conf.all.use_tempaddr=-1

Then I went to this site to generate a local Unique Local Address (ULA):

You can just pick the first subnet.

My subnet was fdf8:d910:d680::/64.

I used fdf8:d910:d680::0001/64 server VM IPv6 address and fdf8:d910:d680::0002/64 for the client VM Ipv6 address.

Example: Add this line to /etc/sysconfig/network-scripts/ifcfg-Team1 on the server VM

IPV6ADDR=fdf8:d910:d680::0001/64

Then start the VMs once this is completed.

To test, I tried pinging the client VM from itself, which was successful.

Then I attempted to ping the client VM from the server VM which was also successful.

If you want my info on IPv6 their are excellent tutorials at the site TunnelBroker. They also have an interesting service that allows you to tunnel IPv6 over IPv4, but the last time I checked they had a feud with Cogent Communications that broke half the IPv6 internet.