RTF_UP		0x0001
RTF_GATEWAY	0x0002
RTF_HOST	0x0004
RTF_REINSTATE	0x0008
RTF_DYNAMIC	0x0010
RTF_MODIFIED	0x0020
RTF_MTU		0x0040
RTF_WINDOW	0x0080
RTF_IRTT	0x0100
RTF_REJECT	0x0200