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This allows user-space to send a '1500' MTU VLAN packet on a 1500 MTU ethernet frame. The extra 4 bytes of a VLAN header is not usually charged against the MTU when other parts of the network stack is transmitting vlans... Signed-off-by: Ben Greear <greearb@candelatech.com> Reviewed-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>