USGv6 R1 fails on Alma Linux 8.4

Hi Team:
We ran USGv6 R1 tests based on IPv6 version 5.0.1 documented here on both RHEL 8.4 and Alma Linux 8.4.

While 100% of tests passed on RHEL 8.4, we saw below failure on Alma Linux 8.4 (both RHEL 8.4 and Alma Linux 8.4 have same kernel version - 4.18.0-305.el8.x86_64)

Failure test cases

Document -

Test v6LC.1.1.1: Version Field in page 17

Test v6LC.2.1.6: Neighbor Solicitation Origination, Reachability Confirmation in page 85,96,87 and 88

Test v6LC.2.2.14: Router Advertisement Processing, Router Lifetime (Hosts Only) Part B, Part C in page 173

Test v6LC.2.3.14: Neighbor Cache Updated from State PROBE (Hosts Only) Part C, Part C in page 256, 257 and 258

Test v6LC.3.2.2: Address Lifetime Expiry (Hosts Only) in page 295

Test v6LC.4.1.5: Reduce PMTU Off-link in page 316

Just wanted to understand what is the plan to fix the above issues? This is a blocker for any product to get USGv6 R1 and IPv6 Ready Logo certification

Any info on this is highly appreciated


AlmaLinux is rebuilt from the sources of RHEL that Red Hat makes public. RH does publish sources of updates only for the latest point update of RHEL, which is currently 8.5.

Therefore, AlmaLinux can support only the latest content, which currently includes kernel-4.18.0-348.20.1.el8_5.

The kernel 4.18.0-305.el8.x86_64 is what RHEL 8.4 and AlmaLinux 8.4 were released with in May 2021. RHEL 8.4 (and hence Alma too ) did release several security patches and bugfixes before release of RHEL 8.5 last Fall.

RHEL 8.4 offers EUS. Red Hat Enterprise Linux Life Cycle - Red Hat Customer Portal
Therefore, RHEL 8.4 has probably released updates after release of RHEL 8.5 too, but they are not publicly available.

Point is, nobody should run with kernel 4.18.0-305.el8.x86_64 today. RHEL 8.4 has some 4.18.0-305.x.y.el8*, while RHEL 8.5 and AlmaLinux have the 4.18.0-348.20.1.el8_5.

Are you saying that logos are happily granted on basis of some ancient version that did conform? (A semi-reasonable assumption, unless additions and fixes create “regressions”.)

Hi There:
Thank you so much for your response.
I was checking if Alma Linux team or anyone else have run USGv5 R1 compliance test cases on Alma Linux 8.x and if it is a known issue that will be fixed soon

Anyways, we will re-run the USGv6 V1 tests on Alma Linux 8.5 - kernel-4.18.0-348.20.1.el8_5


These fora are mostly peer support, just like Mattermost Chat. The Chat seems to have more bit more traffic and more “eyes of the team”.

AlmaLinux is built from RHEL sources. A goal is to be bug-for-bug compatible. If the initial 8.4 did differ in behaviour, then we were a bit short back then. It is also possible that the conformance test looks at inconsequential details that should not matter. (That is very common for “security scan” tools.)