Broadcast MTU size

[Gerrit Binnenmars <gerritbinnenmars@xxxxxxxxx>]

Hello,

I have configured my ethernet device eth0 for jumbo frames: ifconfig
eth0 mtu 9000
I have a vlan eth0.3 on 192.168.0.1 that needs this jumbo frame size.
I also have an alias eth0:test on 192.168.1.1 that can not support
jumbo frames, so I added a route:
ip route change 192.168.1.0/24 dev eth0 src 192.168.1.1 mtu lock 1500
This works fine, on 192.168.0.1 packets go out with size 9000 and on
192.168.1.1 packets go out with 1500.

Now I need a broadcast (of a large packet) to 192.168.1.255 but so far
I wasn't able to  force Linux to use the mtu size of 1500 for
broadcast (kernel 2.6.29).
I tried:
ip route change table local broadcast 192.168.1.255 dev eth0 src
192.168.1.1 mtu lock 1500 without success.

Any ideas?

Gerrit Binnenmars
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