http://www.techpaste.com/2012/05/weblogic-server-ipv6-ipv4-network-channel/

If you have upgraded to configured network channel with IPV6 listen address on Weblogic managed servers. Then,
you need to do below steps to make sure Weblogic automatically differentiate the IPV4 and IPV6 traffic with the default and IPV6 network channels only.

Add below two JVM arguments to the startup script and Restart the servers:

-Djava.net.preferIPv6Addresses=true -Djava.net.preferIPv4Stack=false

Once above changes are done you can verify it by using below steps:

You can verify it by using the network utility commands like Ping6 and tracerts6 for IPV6