selftests: pmtu: Minimum MTU for vti6 is 68
A vti6 interface can carry IPv4 packets too. Signed-off-by: Stefano Brivio <sbrivio@redhat.com> Reviewed-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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