Bug 1462952 – [3.5] Node lost connectivity to pod on another node (due to invalid ARP cache)

Bug 1462952 - [3.5] Node lost connectivity to pod on another node (due to invalid ARP cache)

Summary:	[3.5] Node lost connectivity to pod on another node (due to invalid ARP cache)

Status:	CLOSED ERRATA

Aliases:	None

Product:	OpenShift Container Platform
Classification:	Red Hat
Component:	Networking (Show other bugs)
Sub Component:
Version:	3.4.1
Hardware:	Unspecified Linux

Priority	urgent Severity urgent
Target Milestone:	---
Target Release:	3.5.z
Assigned To:	Ben Bennett
QA Contact:	Meng Bo
Docs Contact:

URL:
Whiteboard:
Keywords:	OpsBlocker

Depends On:	1451854 1462955
Blocks:
	Show dependency tree / graph

Reported:	2017-06-19 14:18 EDT by Ben Bennett
Modified:	2017-07-18 02:51 EDT (History)
CC List:	10 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:	Cause: When an IP address was re-used it would be generated with a random MAC address that would be different from the previous one. Consequence: Any node with an ARP cache that still held the old entry for the IP would not be able to communicate with the node. Fix: Generate the MAC address deterministically from the IP address. Result: A re-used IP address will always have the same MAC address, so the ARP cache can not be out of sync. So the traffic will flow.
Story Points:	---
Clone Of:	1451854
Environment:
Last Closed:	2017-07-11 06:47:38 EDT
Type:	Bug
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Origin (Github)	14685	None	None	None	2017-06-19 14:18 EDT
Github	openshift/ose/pull/791	None	None	None	2017-06-19 14:33 EDT

Groups: None (edit)

Comment 2 hongli 2017-06-22 22:19:04 EDT

verified in atomic-openshift-3.5.5.28-1.git.0.5eb85e0.el7.x86_64, the pod MAC address generation has been changed and no other issue found.

  3: eth0@if15: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 8951 qdisc noqueue state UP 
    link/ether 0a:58:0a:02:02:09 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 10.2.2.9/23 scope global eth0

Comment 4 errata-xmlrpc 2017-07-11 06:47:38 EDT

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://access.redhat.com/errata/RHBA-2017:1640

Note You need to log in before you can comment on or make changes to this bug.