一.命令 proc/net/dev

user_00@xxxx64:~> cat /proc/net/devInter- | Receive | Transmitface| bytes packets errs drop fifo frame compressed multicast | bytes packets errs drop fifo colls carrier compressedeth0: 0 0 0 0 000 0 0 0 0 0 00 00eth1: 67437819880 552776948 0 0 000 6 63179118041 486899714 0 0 00 00lo:2338316682 34154992 0 0 000 0 2338316682 34154992 0 0 00 00tunl0: 0 0 0 0 000 0 0 0 0 0 00 00sit0: 0 0 0 0 000 0 0 0 0 0 00 00ip6tnl0: 0 0 0 0 000 0 0 0 0 0 00 00

最左边的表示接口的名字。

Receive表示收包;Transmit表示收包；bytes表示收发的字节数；packets表示收发正确的包量；errs表示收发错误的包量；drop表示收发丢弃的包量；

二，/proc/net/snmp

user_00@xxxxx64:~> cat /proc/net/snmp

Ip: Forwarding DefaultTTL InReceives InHdrErrors InAddrErrors ForwDatagrams InUnknownProtos InDiscards InDelivers OutRequests OutDiscards OutNoRoutes ReasmTimeout ReasmReqds ReasmOKs ReasmFails FragOKs FragFails FragCreates

Ip: 2 64 583571152 0 0 0 0 0 583571152 520325247 0 0 0 0 0 0 0 0 0

Icmp: InMsgs InErrors InDestUnreachs InTimeExcds InParmProbs InSrcQuenchs InRedirects InEchos InEchoReps InTimestamps InTimestampReps InAddrMasks InAddrMaskReps OutMsgs OutErrors OutDestUnreachs OutTimeExcds OutParmProbs OutSrcQuenchs OutRedirects OutEchos OutEchoReps OutTimestamps OutTimestampReps OutAddrMasks OutAddrMaskReps

Icmp: 9859518 193 316 0 0 0 0 9859190 5 1 0 5 0 9859310 0 119 0 0 0 0 0 9859190 0 1 0 0

Tcp: RtoAlgorithm RtoMin RtoMax MaxConn ActiveOpens PassiveOpens AttemptFails EstabResets CurrEstab InSegs OutSegs RetransSegs InErrs OutRsts

Tcp: 1 200 120000 -1 42226398 41112433 0 407271 84 516490860 453242269 140892 0 1056150

Udp: InDatagrams NoPorts InErrors OutDatagrams

Udp: 57220606 116 0 57223663

通过访问该文件系统，可以对TCP和UDP进行监控：

平均每秒新增TCP连接数

通过/proc/net/snmp文件得到最近240秒内PassiveOpens的增量，除以240得到每秒的平均增量

机器的TCP连接数

通过/proc/net/snmp文件的CurrEstab得到TCP连接数

平均每秒的UDP接收数据报

通过/proc/net/snmp文件得到最近240秒内InDatagrams的增量，除以240得到平均每秒的UDP接收数据报。

平均每秒的UDP发送数据报

通过/proc/net/snmp文件得到最近240秒内OutDatagrams的增量，除以240得到平均每秒的UDP发送数据报。