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netstat
Netstat简介
Netstat 命令用于显示各种网络相关信息，如网络连接，路由表，接口状态 (Interface Statistics)，masquerade 连接，多播成员 (Multicast Memberships) 等等。
参数如下：
[root@rhel6 script]# netstat --help usage: netstat [-veenNcCF] [<Af>] -r netstat {-V|--version|-h|--help} netstat [-vnNcaeol] [<Socket> ...] netstat { [-veenNac] -I[<Iface>] | [-veenNac] -i | [-cnNe] -M | -s } [delay] -r, --route display routing table -I, --interfaces=<Iface> display interface table for <Iface> -i, --interfaces display interface table -g, --groups display multicast group memberships -s, --statistics display networking statistics (like SNMP) -M, --masquerade display masqueraded connections -v, --verbose be verbose -n, --numeric don‘t resolve names --numeric-hosts don‘t resolve host names --numeric-ports don‘t resolve port names --numeric-users don‘t resolve user names -N, --symbolic resolve hardware names -e, --extend display other/more information -p, --programs display PID/Program name for sockets -c, --continuous continuous listing -l, --listening display listening server sockets -a, --all, --listening display all sockets (default: connected) -o, --timers display timers -F, --fib display Forwarding Information Base (default) -C, --cache display routing cache instead of FIB -T, --notrim stop trimming long addresses -Z, --context display SELinux security context for sockets
常见参数
-r, --route display routing table
-i, --interfaces interface table
-s, --statistics display networking statistics (like SNMP)
-l, --listening display listening server sockets
-p, --programs display PID/Program name for sockets
-n 拒绝显示别名，能显示数字的全部转化成数字。
-t (tcp) 仅显示tcp相关选项
-u (udp) 仅显示udp相关选项
应用实例
netstat -lntup
[root@rhel6 script]# netstat -lntup Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:5053 0.0.0.0:* LISTEN 1727/ovtrcd tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 16463/mysqld tcp 0 0 0.0.0.0:111 0.0.0.0:* LISTEN 1563/rpcbind tcp 0 0 0.0.0.0:46067 0.0.0.0:* LISTEN 1585/rpc.statd tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 1684/sshd tcp 0 0 :::54472 :::* LISTEN 1585/rpc.statd tcp 0 0 :::111 :::* LISTEN 1563/rpcbind tcp 0 0 :::22 :::* LISTEN 1684/sshd udp 0 0 0.0.0.0:111 0.0.0.0:* 1563/rpcbind udp 0 0 0.0.0.0:890 0.0.0.0:* 1563/rpcbind udp 0 0 10.120.4.90:123 0.0.0.0:* 1695/ntpd udp 0 0 127.0.0.1:123 0.0.0.0:* 1695/ntpd udp 0 0 0.0.0.0:123 0.0.0.0:* 1695/ntpd udp 0 0 127.0.0.1:914 0.0.0.0:* 1585/rpc.statd udp 0 0 0.0.0.0:45849 0.0.0.0:* 1585/rpc.statd udp 0 0 :::111 :::* 1563/rpcbind udp 0 0 :::890 :::* 1563/rpcbind udp 0 0 :::123 :::* 1695/ntpd udp 0 0 :::58040 :::* 1585/rpc.statd [root@rhel6 script]#
netstat -r
[root@rhel6 script]# netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 10.120.4.0 * 255.255.255.0 U 0 0 0 eth0 link-local * 255.255.0.0 U 0 0 0 eth0 default 10.120.4.1 0.0.0.0 UG 0 0 0 eth0 [root@rhel6 script]#
netstat -s
[root@rhel6 script]# netstat -s Ip: 2049877 total packets received 60418 with invalid addresses 0 forwarded 0 incoming packets discarded 1989459 incoming packets delivered 1981406 requests sent out 12474 outgoing packets dropped Icmp: 162525 ICMP messages received 0 input ICMP message failed. ICMP input histogram: destination unreachable: 162522 echo requests: 3 162525 ICMP messages sent 0 ICMP messages failed ICMP output histogram: destination unreachable: 162522 echo replies: 3 IcmpMsg: InType3: 162522 InType8: 3 OutType0: 3 OutType3: 162522 Tcp: 163249 active connections openings 163186 passive connection openings 58 failed connection attempts
netstat -i
[root@rhel6 script]# netstat -i Kernel Interface table Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg eth0 1500 0 527179 0 0 0 25253 0 0 0 BMRU lo 65536 0 1957492 0 0 0 1957492 0 0 0 LRU [root@rhel6 script]#
netstat
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