zhanggang@T60:~$ sudo netstat -upna
激活Internet连接 (服务器和已建立连接的)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
udp        0      0 127.0.0.1:161           0.0.0.0:*                           18137/snmpd   

zhanggang@T60:/etc/snmp$ snmpwalk -v 2c -c public 127.0.0.1 if
IF-MIB::ifTable = No more variables left in this MIB View (It is past the end of the MIB tree)

zhanggang@T60:/etc/snmp$ snmpwalk -v 2c -c public 192.168.100.122 if
Timeout: No Response from 192.168.100.122

zhanggang@T60:~$  snmpwalk -v 2c -c public 192.168.0.1  if 
IF-MIB::ifIndex.1 = INTEGER: 1
IF-MIB::ifDescr.1 = STRING: Ethernet-WAN
IF-MIB::ifType.1 = INTEGER: ethernetCsmacd(6)
IF-MIB::ifMtu.1 = INTEGER: 1492
IF-MIB::ifSpeed.1 = Gauge32: 0
IF-MIB::ifPhysAddress.1 = STRING: 0:17:9a:60:f0:94
IF-MIB::ifAdminStatus.1 = INTEGER: up(1)
IF-MIB::ifOperStatus.1 = INTEGER: up(1)
IF-MIB::ifLastChange.1 = Timeticks: (251140) 0:41:51.40
IF-MIB::ifInOctets.1 = Counter32: 3445220
IF-MIB::ifInUcastPkts.1 = Counter32: 1797
IF-MIB::ifInNUcastPkts.1 = Counter32: 0
IF-MIB::ifInDiscards.1 = Counter32: 0
IF-MIB::ifInErrors.1 = Counter32: 0
IF-MIB::ifInUnknownProtos.1 = Counter32: 0
IF-MIB::ifOutOctets.1 = Counter32: 338244
IF-MIB::ifOutUcastPkts.1 = Counter32: 1126
IF-MIB::ifOutNUcastPkts.1 = Counter32: 7
IF-MIB::ifOutDiscards.1 = Counter32: 0
IF-MIB::ifOutErrors.1 = Counter32: 0
IF-MIB::ifOutQLen.1 = Gauge32: 16
IF-MIB::ifSpecific.1 = OID: ccitt
End of MIB