Bug 1972636 - [MTU] MTU gets lowered by 1 after applying route rules
Summary: [MTU] MTU gets lowered by 1 after applying route rules
Alias: None
Product: Red Hat Enterprise Linux 8
Classification: Red Hat
Component: nmstate
Version: 8.4
Hardware: Unspecified
OS: Unspecified
Target Milestone: beta
: ---
Assignee: Gris Ge
QA Contact: Mingyu Shi
Depends On:
Blocks: 1962563
TreeView+ depends on / blocked
Reported: 2021-06-16 11:05 UTC by Ales Musil
Modified: 2021-11-09 20:23 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: No Doc Update
Doc Text:
Clone Of:
Last Closed: 2021-11-09 17:43:51 UTC
Type: Bug
Target Upstream Version:

Attachments (Terms of Use)
Reproducer (1.91 KB, application/x-shellscript)
2021-06-16 11:05 UTC, Ales Musil
no flags Details

System ID Private Priority Status Summary Last Updated
Github nmstate nmstate pull 1641 0 None closed [nmstate-1.1] nm wired: Preserve existing wired setting 2021-06-24 04:38:35 UTC
Red Hat Product Errata RHBA-2021:4157 0 None None None 2021-11-09 17:44:23 UTC

Description Ales Musil 2021-06-16 11:05:22 UTC
Created attachment 1791524 [details]

Description of problem:
When applying route rules to bridge with default MTU 1500, the MTU is lowered by 1 to 1499. 

Version-Release number of selected component (if applicable):
nmstate-2.0.0 latest git base

How reproducible:

Steps to Reproduce:
1. Run reproducer script

Actual results:
-  mtu: 1500
+  mtu: 1499

Expected results:
The MTU should stay the same.

Additional info:
I was able to track down start of this failure to PR#1595

However I am not really sure if it\s the root cause.

Comment 1 Gris Ge 2021-06-18 06:57:07 UTC
RHV confirmed the scratch/copr build fixed the issue.

Comment 4 Mingyu Shi 2021-07-21 08:00:49 UTC
Verified with versions:

Comment 6 errata-xmlrpc 2021-11-09 17:43:51 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 (nmstate bug fix and enhancement update), and where to find the updated
files, follow the link below.

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


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