[release-4.6] Bug 1998453: Fix MCS-blocking iptables rules

[creydr]

Cherry-pick of #243 for 4.6

[openshift-ci]

@creydr: This pull request references Bugzilla bug 1998453, which is valid. The bug has been moved to the POST state. The bug has been updated to refer to the pull request using the external bug tracker.

6 validation(s) were run on this bug

• bug is open, matching expected state (open)
• bug target release (4.6.z) matches configured target release for branch (4.6.z)
• bug is in the state NEW, which is one of the valid states (NEW, ASSIGNED, ON_DEV, POST, POST)
• dependent bug Bugzilla bug 1915027 is in the state CLOSED (ERRATA), which is one of the valid states (VERIFIED, RELEASE_PENDING, CLOSED (ERRATA), CLOSED (CURRENTRELEASE))
• dependent Bugzilla bug 1915027 targets the "4.7.0" release, which is one of the valid target releases: 4.7.0, 4.7.z
• bug has dependents

Requesting review from QA contact:
/cc @zhaozhanqi

In response to this:

[release-4.6] Bug 1998453: Fix MCS-blocking iptables rules

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[danwinship]

/lgtm

This bug only affected one customer that we know of, but it's an easy and safe fix.
(And even if it doesn't consistently break anyone else, it will still randomly break roughly 1 out of 32,768 connections for everybody...)

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: creydr, danwinship

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• OWNERS [danwinship]

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[dmunne]

@knobunc / @dcbw, can you help with the cherry-pick-approved label?
Thanks!

[creydr]

@knobunc / @dcbw can you help @dmunne here with the cherry-pick-approved label?
Thanks

[mfojtik]

[patch-manager] 🚀 Approved for z-stream by score: 1.00

adding cherry-pick approved

[openshift-ci]

@creydr: All pull requests linked via external trackers have merged:

• openshift/sdn#340

Bugzilla bug 1998453 has been moved to the MODIFIED state.

In response to this:

[release-4.6] Bug 1998453: Fix MCS-blocking iptables rules

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.