# Network Interface MTU question

**URL:** <https://forums.rockylinux.org/t/network-interface-mtu-question/6136>\
**Category:** Rocky Linux Help & Support\
**Created:** [May 24, 2022, 9:52am UTC](https://forums.rockylinux.org/t/network-interface-mtu-question/6136 "2022-05-24T09:52:10Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![ken\_gao](https://avatars.discourse-cdn.com/v4/letter/k/5f8ce5/32.png) [@ken\_gao](https://forums.rockylinux.org/u/ken_gao)\
**Post date:** [May 24, 2022, 9:52am UTC](https://forums.rockylinux.org/t/network-interface-mtu-question/6136/1 "2022-05-24T09:52:10Z")

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Rockylinux8.4 - Network Interface file (ifcfg-enp3s0) config MTU=1000 ,Restart network interface ,ifconfig enp3s0,show mtu=1280 ,not show 1000.

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**Author:** ![linuxlover](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/linuxlover/32/2227_2.png) [@linuxlover](https://forums.rockylinux.org/u/linuxlover)\
**Post date:** [May 24, 2022, 10:59am UTC](https://forums.rockylinux.org/t/network-interface-mtu-question/6136/2 "2022-05-24T10:59:03Z")

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Try

nmcli connection modify enp3s0 802-3-ethernet.mtu 1000

systemctl restart NetworkManager

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**Author:** ![jlehtone](https://avatars.discourse-cdn.com/v4/letter/j/e9a140/32.png) [@jlehtone](https://forums.rockylinux.org/u/jlehtone)\
**Post date:** [May 24, 2022, 11:03am UTC](https://forums.rockylinux.org/t/network-interface-mtu-question/6136/3 "2022-05-24T11:03:59Z")

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What do these show:

```bash
nmcli con show enp3s0 | grep -i mtu
ip link show enp3s0

```

(The ‘ifconfig’ got an improved replacement ‘ip’ – of iproute2 package – over two decades ago. That probably does not matter here.)  
(In RHEL 9 NetworkManager will no longer write/use legacy _ifcfg-\*_ files, at least not by default.)

PS. “Rockylinux8.4”? “8.4”? Rocky Linux is currently based on sources of RHEL 8.6 – the 8.[45] are no longer supported. NetworkManager appears to have been rebased in both 8.5 and 8.6; new features and fixes.

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**Author:** ![brian](https://sea2.discourse-cdn.com/flex020/user_avatar/forums.rockylinux.org/brian/32/5777_2.png) [@brian](https://forums.rockylinux.org/u/brian)\
**Post date:** [August 25, 2023, 3:48am UTC](https://forums.rockylinux.org/t/network-interface-mtu-question/6136/4 "2023-08-25T03:48:54Z")

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Closed on August 25, 2023, 3:48am UTC