This is not a bug in network-manager. My guess is this fits better as
marked against the kernel, so I'm re-assigning this to the linux package
(because ifconfig returns SIOCSIFMTU when passed something greater than
the allowed value as a parameter).
Note that this is implemented in the driver in all cases. For instance,
the e1000 driver allows up to 16128 for MTU (and it's normal since it's
a gig-capable NIC). Others, although gigabit-capable, still limit to
1500 (for instance, tg3).
Windows may be accepting higher values but not necessarily taking them;
you should capture traffic coming from the host and see if it's really
being sent as jumbo frames, with which size, and if the other network
equipment will accept it properly. With that done, it's then possible to
provide more information to the kernel developers if the driver code
needs to be patched.
** Package changed: network-manager (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/777534
Title:
ifconfig eth0 mtu 7000 works but 9000 does not
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