The virtual machine cannot obtain an IPv6 address. How do I troubleshoot this?

Solution

1. Check the /etc/modprobe.d/disable_ipv6.conf file and verify the options ipv6 disable=0 setting.

2. Check /etc/sysconfig/network and verify the NETWORKING_IPV6=yes setting.

3. Edit /etc/sysctl.conf and verify the following settings: net.ipv6.conf.all.disable_ipv6=0, net.ipv6.conf.default.disable_ipv6=0, and net.ipv6.conf.lo.disable_ipv6=0.

4. Check the network adapter configuration file /etc/sysconfig/network-scripts/ifcfg-ens33 and verify that the parameters are configured correctly.