Two JDK8 IPv6 failures on containers on dockerhost-azure x64 systems

[sxa]

The two test cases listed below from jdk_net fail consistently on containers on these machines: https://ci.adoptium.net/label/hw.dockerhost.dockerhost-azure-ubuntu2204-x64-1/ - Note that this is specific to JDK8 - later versions pass the tests on test-docker-ubuntu2404-x64-1

Please set the title to indicate the test name and machine name where known.

To make it easy for the infrastructure team to repeat and diagnose, please answer the following questions:

• test suite/name (e.g, BUILD_LIST, TARGET, CUSTOM_TARGET)? - : java/net/ipv6tests/B6521014.java.B6521014
• java/net/Inet6Address/B6206527.java.B6206527
• a link into recent Test_ job on https://ci.adoptium.net which showed the failure https://ci.adoptium.net/job/Test_openjdk8_hs_extended.openjdk_x86-64_linux/252/testReport plus various links in the notes at the bottom of https://github.com/adoptium/infrastructure/issues/3868#issuecomment-3227682265
• Hyperlink to re-run in Grinder: Link to re-grind - set LABEL accordingly
• Is there an existing issue elsewhere covering this?
• Which machine(s) does it work on? Anything that isn't an azure dockerhost
• Which machine(s) does it fail on? azure dockerhost containers

Any other details: Could be related to the networking on that host using NAT to access the internet?