Created attachment 1613928[details]
Reproducer
Description of problem:
Considering scenario eth0 and two VLANs on top eth0.10 and eth.20 all of them with MTU 2000. When we change the MTU of eth0 and eth0.20 and apply this config the MTU of eth0.10 is reverted to default value (1500), but in the NM has still 2000 in the config.
Version-Release number of selected component (if applicable):
NetworkManager-1.20.0-3.el8.x86_64
How reproducible:
100%
Steps to Reproduce:
Full reproducer is in attachment.
Actual results:
76: dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 2200
77: dummy_abc.10@dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500
79: dummy_abc.20@dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 2200
Expected results:
76: dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 2200
77: dummy_abc.10@dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 2000
79: dummy_abc.20@dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 2200
Comment 1Beniamino Galvani
2019-09-13 10:21:28 UTC
(In reply to Beniamino Galvani from comment #4)
> (In reply to Beniamino Galvani from comment #3)
>
Editing the MTU/s on a server, especially on a hypervisor is a common practice and supported by layered products like RHV.
This problem seems like a regression (seems to have worked before) and it is too basic not to handle as soon as possible.
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 1613928 [details] Reproducer Description of problem: Considering scenario eth0 and two VLANs on top eth0.10 and eth.20 all of them with MTU 2000. When we change the MTU of eth0 and eth0.20 and apply this config the MTU of eth0.10 is reverted to default value (1500), but in the NM has still 2000 in the config. Version-Release number of selected component (if applicable): NetworkManager-1.20.0-3.el8.x86_64 How reproducible: 100% Steps to Reproduce: Full reproducer is in attachment. Actual results: 76: dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 2200 77: dummy_abc.10@dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 1500 79: dummy_abc.20@dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 2200 Expected results: 76: dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 2200 77: dummy_abc.10@dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 2000 79: dummy_abc.20@dummy_abc: <BROADCAST,NOARP,UP,LOWER_UP> mtu 2200