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b81774cff8
Since kernel 4.10 commit 61e84623ace3 ("net: centralize net_device min/max MTU checking"), the range of mtu is [min_mtu, max_mtu], which is [68, 1500] by default. It's necessary to set a max_mtu if a mtu > 1500 is supported. Signed-off-by: Mathias Kresin <dev@kresin.me> (backported from 5da2c68d001ee44b15a58639ed03a0ebb6f68020)