# Permanently set MTU on StartTunnel for Tor to connect

**URL:** <https://community.start9.com/t/permanently-set-mtu-on-starttunnel-for-tor-to-connect/5924>\
**Category:** Services Support\
**Created:** [October 31, 2026, 3:54pm UTC](https://community.start9.com/t/permanently-set-mtu-on-starttunnel-for-tor-to-connect/5924 "2026-10-31T15:54:24Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![monk](https://community.start9.com/letter_avatar_proxy/v4/letter/m/c89c15/32.png) [@monk](https://community.start9.com/u/monk)\
**Post date:** [October 31, 2026, 3:54pm UTC](https://community.start9.com/t/permanently-set-mtu-on-starttunnel-for-tor-to-connect/5924/1 "2026-10-31T15:54:24Z")

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Tor on 0.4.x won’t connect to my StartTunnel VPS (T-Mobile internet provider) unless I run

> `sudo ip link set wg0 mtu 1280`

The problem is when I reboot the server, the MTU goes back to 1420. Some of the things I have tried to make the change permanent:

1. sudo systemctl edit wg-quick@wg0
2. setting MTUBytes via /etc/systemd/network/10-wg0.link
3. setting mtu via /etc/udev/rules.d/10-mtu.rules

Any ideas appreciated.

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**Author:** ![ruxal](https://community.start9.com/user_avatar/community.start9.com/ruxal/32/451_2.png) [@ruxal](https://community.start9.com/u/ruxal)\
**Post date:** [October 31, 2026, 11:00pm UTC](https://community.start9.com/t/permanently-set-mtu-on-starttunnel-for-tor-to-connect/5924/2 "2026-10-31T23:00:25Z")

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> **[GitHub - JesseMarkowitz/admintools-startos: This is NOT a wrapper for another service. This...](https://github.com/JesseMarkowitz/admintools-startos)**
>
> This is NOT a wrapper for another service. This is a bash shell script designed to be used by a less technical admin to help administer their StartOS server via SSH.

you could install this toolset and setup a crown job every hour then to reset or even check MTU, problem is you need to re install it after an update but not every reboot. I am using this for automated backups. Below are the intrusctions for entering persistent mode if you dont want to use the tool itself

> [@Guide: Updated Automating Backups on StartOS 0.4.0 (Advanced)](https://community.start9.com/t/guide-updated-automating-backups-on-startos-0-4-0-advanced/5620):
>
> The guide below is a new draft updating the earlier guide for automating backups. This is more advanced and more complicated because it provides more protection for your password. Feedback is greatly appreciated. Automating StartOS Backups with SSH and Cron This guide applies to StartOS 0.4.0. It is fully standalone: it does not install, require, or reference any third-party administration tool. Every step uses only what StartOS itself ships (SSH, start-cli, and cron) plus a root-only passw…

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**Author:** ![Alvaro](https://community.start9.com/user_avatar/community.start9.com/alvaro/32/452_2.png) [@Alvaro](https://community.start9.com/u/Alvaro)\
**Post date:** [November 1, 2026, 9:01pm UTC](https://community.start9.com/t/permanently-set-mtu-on-starttunnel-for-tor-to-connect/5924/3 "2026-11-01T21:01:39Z")

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Are you running the latest versions of StartOS 0.4.1.1, Tor (Service) 0.4.9.15:0 and StartTunnel 1.5.0?