No option to change MTU for mobile broadband in NetworkManager

Bug #801313 reported by James Haigh
This bug affects 1 person
Affects Status Importance Assigned to Milestone
Network Manager Applet
network-manager-applet (Ubuntu)

Bug Description

Mobile broadband connections seem to work best when the MTU is 1430:

Currently there is no native way of setting this in NM and I have to change it by this command every time I connect:
sudo ifconfig ppp0 mtu 1430

MTU can be set for wired and wireless, why not mobile?

I suggest that the MTU value should be set on the 'Mobile Broadband' tab of a connection under the 'Advanced' section. It should also be 1430 by default (or some other common recommended value for mobile broadband).

I'm running Natty but I've never seen an option in other releases either.

Revision history for this message
James Haigh (james.r.haigh) wrote :

This is actually network-manager-gnome; I didn't realise 'Network Connections' (nm-connection-editor) was a separate package from the applet.

james@james-ThinkPad-X60-Tablet:~$ dpkg -S /usr/bin/nm-connection-editor
network-manager-gnome: /usr/bin/nm-connection-editor

Revision history for this message
James Haigh (james.r.haigh) wrote :

"'network-manager-gnome' is a binary package. This bug has been assigned to its source package 'network-manager-applet' instead."

Oh! I was correct with 'network-manager-applet' all along! :)

Revision history for this message
James Haigh (james.r.haigh) wrote :

What are the chances for Oneiric? I guess none. I reported this weeks ago but there's still no reply.

Changed in network-manager-applet:
importance: Unknown → High
status: Unknown → New
Revision history for this message
Mathieu Trudel-Lapierre (cyphermox) wrote :

Thank you for taking the time to report this bug and helping to make Ubuntu better. The issue you are reporting is an upstream one and it would be nice if somebody having it could send the bug to the developers of the software by following the instructions at If you have done so, please tell us the number of the upstream bug (or the link), so we can add a bugwatch that will inform us about its status.

As a workaround, for now you should be able to set "mtu 1430" in /etc/ppp/options, which should be taken into account when you connect (but it will affect all ppp connections, including VPN).

Thanks in advance.

Revision history for this message
Mathieu Trudel-Lapierre (cyphermox) wrote :

Obviously, I'm an idiot so I didn't notice it was already upstream, so please disregard this :)

Changed in network-manager-applet (Ubuntu):
status: New → Confirmed
importance: Undecided → High
importance: High → Medium
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