RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Description of problem:
Multicast does not work over IPv6

corosync 2.3.5 but I suspect this goes back some way

How reproducible:
Every time

Steps to Reproduce:
1. Set up a cluster to use IPv6 multicast
2. Start nodes

Actual results:
The nodes do not see each other. corosync-quorumtool shows that all the
nodes are isolated

Expected results:
Cluster should form correctly.

Additional info:
This is specific to IPv6, IPv4 clusters are not affected. Also IPv6 clusters using updu are also fine.

Here is my corosync.conf for testing. The other node has IP address
ending in :2 of course.

totem {
    version: 2
    secauth: off
    cluster_name: small
    transport: udp
    interface {
        ringnumber:   0
	mcastaddr:    ff08::2
	bindnetaddr:  2001:db8:1:0:200:11ff:fecc:1
	ttl: 8
    }
    ip_version: ipv6
    nodeid: 1
}

quorum {
    provider: corosync_votequorum
    expected_votes: 2
}

Created attachment 1094783 [details]
Patch to move the bind() so that ipV6 works

I've also tested that this patch does not break IPv4.

This bug was accidentally moved from POST to MODIFIED via an error in automation, please see mmccune with any questions

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2463.html