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Bug 1394344

Summary:	[RFE] Improve Multihoming
Product:	Red Hat Enterprise Linux 7	Reporter:	Lubomir Rintel <lrintel>
Component:	NetworkManager	Assignee:	Lubomir Rintel <lrintel>
Status:	CLOSED ERRATA	QA Contact:	Desktop QE <desktop-qa-list>
Severity:	medium	Docs Contact:	Jiri Herrmann <jherrman>
Priority:	medium
Version:	7.4	CC:	atragler, bgalvani, fgiudici, jherrman, lrintel, mleitner, rkhan, sukulkar, thaller, tpelka, vbenes
Target Milestone:	rc	Keywords:	FutureFeature
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	NetworkManager-1.8.0-0.4.rc1.el7	Doc Type:	Enhancement
Doc Text:	Enhanced networked reliability on multihomed hosts On interfaces with a route that is already present on another interface, the NetworkManager utility now automatically switches the reverse path filtering method from `Strict` to `Loose`. This enhances network reliability on multihomed host machines.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-08-01 09:19:37 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1393481, 1411731

Description Lubomir Rintel 2016-11-11 18:26:08 UTC

In a situation where user user enables an address from a range he's using on different interface already on a higher-priority interface, rp_filter drops traffic from the original interface.

That causes the existing connections to time out.

A typical scenario is user with a router, that bridges wired LAN and WLAN plugging in a cable while he's already connected to a WLAN.

We need to figure out what to do about this.

One possibility is relaxing rp_filter on Workstation (from =1 to =2). Another would be dynamically changing the rp_filter if we detect the aforementioned situation.

Currently the rp_filter=1 is enabled by systemd's sysctl.conf.d

Comment 1 Lubomir Rintel 2017-03-28 14:02:59 UTC

Went in upstream: https://bugzilla.gnome.org/show_bug.cgi?id=780155

Comment 3 errata-xmlrpc 2017-08-01 09:19:37 UTC

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/RHSA-2017:2299