Bug 1753128
| Summary: | Cannot set MTU lower than 1280 | ||||||
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| Product: | Red Hat Enterprise Linux 8 | Reporter: | Gris Ge <fge> | ||||
| Component: | NetworkManager | Assignee: | Beniamino Galvani <bgalvani> | ||||
| Status: | CLOSED ERRATA | QA Contact: | Desktop QE <desktop-qa-list> | ||||
| Severity: | medium | Docs Contact: | |||||
| Priority: | unspecified | ||||||
| Version: | 8.1 | CC: | atragler, bgalvani, edwardh, fgiudici, lrintel, pasik, rkhan, sukulkar, thaller, toneata, vbenes | ||||
| Target Milestone: | rc | Keywords: | ZStream | ||||
| Target Release: | 8.2 | Flags: | pm-rhel:
mirror+
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| Hardware: | x86_64 | ||||||
| OS: | Linux | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | NetworkManager-1.22.0-0.1.el8 | Doc Type: | If docs needed, set a value | ||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | |||||||
| : | 1775136 (view as bug list) | Environment: | |||||
| Last Closed: | 2020-04-28 16:53:06 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: | 1775136 | ||||||
| Attachments: |
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Added a couple of commits to fix this to merge request https://gitlab.freedesktop.org/NetworkManager/NetworkManager/merge_requests/273 Fixed on master by: https://gitlab.freedesktop.org/NetworkManager/NetworkManager/commit/5f284e1574e0c3ab319b504671d263ce89ca12f9 https://gitlab.freedesktop.org/NetworkManager/NetworkManager/commit/353c7c95c1c664c024c4267e67ed2d4b57b44437 This problem does not exists in NetworkManager-1.12.6-5.fc29.x86_64 of Fedora 29. Regression it is. RHV customers have the capability to set the MTU lower than 1280, so it is a regression if we do not fix it for RHEL 8.1.z Could you please backport it? Per comment c#5, requesting a z stream update for this. Will be required for RHV to pick up this change for their 4.4 release. Anita, Can you please provide z stream+? Thanks! Sushil 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-2020:1847 |
Created attachment 1616113 [details] System logs with NM trace enabled Description of problem: Cannot set `802-3-ethernet.mtu` lower than 1280, the network manager will still activate the profile with 1280 MTU. Version-Release number of selected component (if applicable): NetworkManager-1.20.0-3.el8.x86_64 How reproducible: 100% Steps to Reproduce: #!/bin/bash nmcli c del veth1 ip link del veth1 nmcli c del veth1 ip link add veth1 type veth peer name veth1.ep ip link set veth1 up ip link set veth1.ep up nmcli device set veth1 managed yes nmcli c add type ethernet ifname veth1 \ connection.id veth1 \ ipv4.method disabled \ 802-3-ethernet.mtu 1200 \ ipv6.method disabled nmcli c up veth1 ip link show veth1 Actual results: The MTU of veth1 show as 1280. Expected results: The MTU of veth1 show as 1200. Additional info: