[Pkg-utopia-maintainers] Bug#418023: Interfaces managed by NetworkManager have MTU 576

[Michael Biebl]

Michel Dänzer wrote:
> Package: network-manager
> Version: 0.6.4-7
> Severity: important
> 
> 
> I noticed that all interfaces managed by NetworkManager seem to
> have an MTU of 576 bytes (the minimum). This seems to have a negative
> effect on download speed, or certainly not a positive one. As
> nm_system_get_mtu() in src/backends/NetworkManagerDebian.c returns 0,
> NetworkManager doesn't seem to set the MTU explicitly though, so I'm not
> sure where the default is coming from. I verified that hacking the above
> function to return 1500 results in interfaces managed by NetworkManager
> having an MTU of 1500, with a line like
> 
> Apr  6 12:18:52 thor NetworkManager: <information>^ISetting MTU of
> interface 'sungem' to 1500
> 
> in syslog.

Hi Michel,

do you have the same problem when you manage your devices with ifupdown?
Basically, nm_system_get_mtu() returning 0, means that the system
default is used and network-manager does not mess with it.
Is there an authoritive config file, where we could read the mtu
configuration? Otherwise I would refrain from setting the MTU to any
arbitrary fixed number.

Cheers,
Michael
-- 
Why is it that all of the instruments seeking intelligent life in the
universe are pointed away from Earth?

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