}
public ProtocolInt31Field fetchDifferentiatedServices() {
if (_differentiatedServices == null) {
// differentiatedServices = new ProtocolBitField("tos", 1, 0, 8, this);
_differentiatedServices = new ProtocolInt31Field("tos", "差别服务", 1, 1, true, this);
}
return _differentiatedServices;
}