linux/proc/net/arp文件
/proc/net/arp
This holds an ASCII readable dump of the kernel ARP table used for address resolutions.
It will show both dynamically learned and preprogrammed ARP entries.
The format is:
IP address HW type Flags HW address Mask Device
192.168.0.50 0x1 0x2 00:50:BF:25:68:F3 * eth0
192.168.0.250 0x1 0xc 00:00:00:00:00:00 * eth0
Here "IP address" is the IPv4 address of the machine
and the "HW type" is the hardware type of the address from RFC 826.
The flags are the internal
flags of the ARP structure (as defined in /usr/include/linux/if_arp.h) and
the "HW address" is the data link layer mapping for that IP address if it is known.
/* ARP protocol HARDWARE identifiers. */
#define ARPHRD_NETROM 0 /* from KA9Q: NET/ROM pseudo */
#define ARPHRD_ETHER 1 /* Ethernet 10Mbps */
#define ARPHRD_EETHER 2 /* Experimental Ethernet */
#define ARPHRD_AX25 3 /* AX.25 Level 2 */
#define ARPHRD_PRONET 4 /* PROnet token ring */
#define ARPHRD_CHAOS 5 /* Chaosnet */
#define ARPHRD_IEEE802 6 /* IEEE 802.2 Ethernet/TR/TB */
#define ARPHRD_ARCNET 7 /* ARCnet */
#define ARPHRD_APPLETLK 8 /* APPLEtalk */
#define ARPHRD_DLCI 15 /* Frame Relay DLCI */
#define ARPHRD_ATM 19 /* ATM */
#define ARPHRD_METRICOM 23 /* Metricom STRIP (new IANA id) */
#define ARPHRD_IEEE1394 24 /* IEEE 1394 IPv4 - RFC 2734 */
#define ARPHRD_EUI64 27 /* EUI-64 */
#define ARPHRD_INFINIBAND 32 /* InfiniBand */
/* ARP Flag values. */
#define ATF_COM 0x02 /* completed entry (ha valid) */
#define ATF_PERM 0x04 /* permanent entry */
#define ATF_PUBL 0x08 /* publish entry */
#define ATF_USETRAILERS 0x10 /* has requested trailers */
#define ATF_NETMASK 0x20 /* want to use a netmask (only
for proxy entries) */
#define ATF_DONTPUB 0x40 /* don't answer this addresses */
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