Linux Netstat命令
1.列出TCP和UDP连接的所有LISTENING端口
清单用 netstat -a选项的所有端口（TCP和UDP）。# netstat -a | more Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:sunrpc *:* LISTEN tcp 0 52 192.168.0.2:ssh 192.168.0.1:egs ESTABLISHED tcp 1 0 192.168.0.2:59292 www.gov.com:http CLOSE_WAIT tcp 0 0 localhost:smtp *:* LISTEN tcp 0 0 *:59482 *:* LISTEN udp 0 0 *:35036 *:* udp 0 0 *:npmp-local *:* Active UNIX domain sockets (servers and established) Proto RefCnt Flags Type State I-Node Path unix 2 [ ACC ] STREAM LISTENING 16972 /tmp/orbit-root/linc-76b-0-6fa08790553d6 unix 2 [ ACC ] STREAM LISTENING 17149 /tmp/orbit-root/linc-794-0-7058d584166d2 unix 2 [ ACC ] STREAM LISTENING 17161 /tmp/orbit-root/linc-792-0-546fe905321cc unix 2 [ ACC ] STREAM LISTENING 15938 /tmp/orbit-root/linc-74b-0-415135cb6aeab
2.列出TCP端口连接
清单用 netstat -at只有 TCP（ 传输控制协议 ）端口连接。# netstat -at Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:ssh *:* LISTEN tcp 0 0 localhost:ipp *:* LISTEN tcp 0 0 localhost:smtp *:* LISTEN tcp 0 52 192.168.0.2:ssh 192.168.0.1:egs ESTABLISHED tcp 1 0 192.168.0.2:59292 www.gov.com:http CLOSE_WAIT
3.列出UDP端口连接
清单用 netstat -au只有 UDP（ 用户数据报协议 ）端口连接。# netstat -au Active Internet connections (servers and established) Proto Recv-Q Send-Q Local Address Foreign Address State udp 0 0 *:35036 *:* udp 0 0 *:npmp-local *:* udp 0 0 *:mdns *:*
4.列出所有LISTENING连接
清单用 netstat -l所有活动监听端口的连接。# netstat -l Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:sunrpc *:* LISTEN tcp 0 0 *:58642 *:* LISTEN tcp 0 0 *:ssh *:* LISTEN udp 0 0 *:35036 *:* udp 0 0 *:npmp-local *:* Active UNIX domain sockets (only servers) Proto RefCnt Flags Type State I-Node Path unix 2 [ ACC ] STREAM LISTENING 16972 /tmp/orbit-root/linc-76b-0-6fa08790553d6 unix 2 [ ACC ] STREAM LISTENING 17149 /tmp/orbit-root/linc-794-0-7058d584166d2 unix 2 [ ACC ] STREAM LISTENING 17161 /tmp/orbit-root/linc-792-0-546fe905321cc unix 2 [ ACC ] STREAM LISTENING 15938 /tmp/orbit-root/linc-74b-0-415135cb6aeab
5.列出所有TCP监听端口
列出所有积极倾听的TCP端口使用 netstat的选项 -lt。# netstat -lt Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 *:dctp *:* LISTEN tcp 0 0 *:mysql *:* LISTEN tcp 0 0 *:sunrpc *:* LISTEN tcp 0 0 *:munin *:* LISTEN tcp 0 0 *:ftp *:* LISTEN tcp 0 0 localhost.localdomain:ipp *:* LISTEN tcp 0 0 localhost.localdomain:smtp *:* LISTEN tcp 0 0 *:http *:* LISTEN tcp 0 0 *:ssh *:* LISTEN tcp 0 0 *:https *:* LISTEN
6.列出所有UDP监听端口
列出所有主动监听UDP端口使用 netstat的选项 -lu。# netstat -lu Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State udp 0 0 *:39578 *:* udp 0 0 *:meregister *:* udp 0 0 *:vpps-qua *:* udp 0 0 *:openvpn *:* udp 0 0 *:mdns *:* udp 0 0 *:sunrpc *:* udp 0 0 *:ipp *:* udp 0 0 *:60222 *:* udp 0 0 *:mdns *:*
7.列出所有UNIX监听端口
清单用 netstat -lx所有活动UNIX监听端口。# netstat -lx Active UNIX domain sockets (only servers) Proto RefCnt Flags Type State I-Node Path unix 2 [ ACC ] STREAM LISTENING 4171 @ISCSIADM_ABSTRACT_NAMESPACE unix 2 [ ACC ] STREAM LISTENING 5767 /var/run/cups/cups.sock unix 2 [ ACC ] STREAM LISTENING 7082 @/tmp/fam-root- unix 2 [ ACC ] STREAM LISTENING 6157 /dev/gpmctl unix 2 [ ACC ] STREAM LISTENING 6215 @/var/run/hald/dbus-IcefTIUkHm unix 2 [ ACC ] STREAM LISTENING 6038 /tmp/.font-unix/fs7100 unix 2 [ ACC ] STREAM LISTENING 6175 /var/run/avahi-daemon/socket unix 2 [ ACC ] STREAM LISTENING 4157 @ISCSID_UIP_ABSTRACT_NAMESPACE unix 2 [ ACC ] STREAM LISTENING 60835836 /var/lib/mysql/mysql.sock unix 2 [ ACC ] STREAM LISTENING 4645 /var/run/audispd_events unix 2 [ ACC ] STREAM LISTENING 5136 /var/run/dbus/system_bus_socket unix 2 [ ACC ] STREAM LISTENING 6216 @/var/run/hald/dbus-wsUBI30V2I unix 2 [ ACC ] STREAM LISTENING 5517 /var/run/acpid.socket unix 2 [ ACC ] STREAM LISTENING 5531 /var/run/pcscd.comm
8.按议定书显示统计
按协议显示统计信息。默认情况下，显示TCP，UDP，ICMP和IP协议的统计信息。 -s参数可用于指定一组协议。# netstat -s Ip: 2461 total packets received 0 forwarded 0 incoming packets discarded 2431 incoming packets delivered 2049 requests sent out Icmp: 0 ICMP messages received 0 input ICMP message failed. ICMP input histogram: 1 ICMP messages sent 0 ICMP messages failed ICMP output histogram: destination unreachable: 1 Tcp: 159 active connections openings 1 passive connection openings 4 failed connection attempts 0 connection resets received 1 connections established 2191 segments received 1745 segments send out 24 segments retransmited 0 bad segments received. 4 resets sent Udp: 243 packets received 1 packets to unknown port received. 0 packet receive errors 281 packets sent
9.显示TCP协议的统计
使用 netstat的选项 -st仅显示TCP协议的统计数据。# netstat -st Tcp: 2805201 active connections openings 1597466 passive connection openings 1522484 failed connection attempts 37806 connection resets received 1 connections established 57718706 segments received 64280042 segments send out 3135688 segments retransmited 74 bad segments received. 17580 resets sent
10.通过UDP协议显示统计信息
# netstat -su Udp: 1774823 packets received 901848 packets to unknown port received. 0 packet receive errors 2968722 packets sent
11.使用PID显示服务名称
显示服务名称与PID号，使用 netstat的选项将 -tp显示“PID /节目名”。# netstat -tp Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 192.168.0.2:ssh 192.168.0.1:egs ESTABLISHED 2179/sshd tcp 1 0 192.168.0.2:59292 www.gov.com:http CLOSE_WAIT 1939/clock-applet
12.显示混杂模式
使用-ac开关显示混杂模式，netstat每五秒打印所选信息或刷新屏幕。默认屏幕刷新每秒。# netstat -ac 5 | grep tcp tcp 0 0 *:sunrpc *:* LISTEN tcp 0 0 *:58642 *:* LISTEN tcp 0 0 *:ssh *:* LISTEN tcp 0 0 localhost:ipp *:* LISTEN tcp 0 0 localhost:smtp *:* LISTEN tcp 1 0 192.168.0.2:59447 www.gov.com:http CLOSE_WAIT tcp 0 52 192.168.0.2:ssh 192.168.0.1:egs ESTABLISHED tcp 0 0 *:sunrpc *:* LISTEN tcp 0 0 *:ssh *:* LISTEN tcp 0 0 localhost:ipp *:* LISTEN tcp 0 0 localhost:smtp *:* LISTEN tcp 0 0 *:59482 *:* LISTEN
13.显示内核IP路由
使用netstat和route命令显示内核IP路由表。# netstat -r Kernel IP routing table Destination Gateway Genmask Flags MSS Window irtt Iface 192.168.0.0 * 255.255.255.0 U 0 0 0 eth0 link-local * 255.255.0.0 U 0 0 0 eth0 default 192.168.0.1 0.0.0.0 UG 0 0 0 eth0
显示网络接口事务
显示网络接口分组事务，包括传输和接收具有MTU大小的分组。# 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 4459 0 0 0 4057 0 0 0 BMRU lo 16436 0 8 0 0 0 8 0 0 0 LRU
15.显示内核接口表
显示内核接口表，类似于 ifconfig命令。# netstat -ie Kernel Interface table eth0 Link encap:Ethernet HWaddr 00:0C:29:B4:DA:21 inet addr:192.168.0.2 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:feb4:da21/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:4486 errors:0 dropped:0 overruns:0 frame:0 TX packets:4077 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:2720253 (2.5 MiB) TX bytes:1161745 (1.1 MiB) Interrupt:18 Base address:0x2000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:8 errors:0 dropped:0 overruns:0 frame:0 TX packets:8 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:480 (480.0 b) TX bytes:480 (480.0 b)
16.显示IPv4和IPv6信息
显示IPv4和IPv6的组播组成员资格信息。# netstat -g IPv6/IPv4 Group Memberships Interface RefCnt Group --------------- ------ --------------------- lo 1 all-systems.mcast.net eth0 1 224.0.0.251 eth0 1 all-systems.mcast.net lo 1 ff02::1 eth0 1 ff02::202 eth0 1 ff02::1:ffb4:da21 eth0 1 ff02::1
17.连续打印Netstat信息
要获取netstat信息每隔几秒钟，然后使用以下命令，它将连续打印netstat信息，说每隔几秒钟。# netstat -c Active Internet connections (w/o servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 youcl.com:http sg2nlhg007.shr.prod.s:36944 TIME_WAIT tcp 0 0 youcl.com:http sg2nlhg010.shr.prod.s:42110 TIME_WAIT tcp 0 132 youcl.com:ssh 115.113.134.3.static-:64662 ESTABLISHED tcp 0 0 youcl.com:http crawl-66-249-71-240.g:41166 TIME_WAIT tcp 0 0 localhost.localdomain:54823 localhost.localdomain:smtp TIME_WAIT tcp 0 0 localhost.localdomain:54822 localhost.localdomain:smtp TIME_WAIT tcp 0 0 youcl.com:http sg2nlhg010.shr.prod.s:42091 TIME_WAIT tcp 0 0 youcl.com:http sg2nlhg007.shr.prod.s:36998 TIME_WAIT
18.寻找不支持性地址
使用一些有用的信息查找未配置的地址系列。# netstat --verbose netstat: no support for `AF IPX' on this system. netstat: no support for `AF AX25' on this system. netstat: no support for `AF X25' on this system. netstat: no support for `AF NETROM' on this system.
19.寻找听力计划
了解在端口上运行的监听程序的数量。# netstat -ap | grep http tcp 0 0 *:http *:* LISTEN 9056/httpd tcp 0 0 *:https *:* LISTEN 9056/httpd tcp 0 0 youcl.com:http sg2nlhg008.shr.prod.s:35248 TIME_WAIT - tcp 0 0 youcl.com:http sg2nlhg007.shr.prod.s:57783 TIME_WAIT - tcp 0 0 youcl.com:http sg2nlhg007.shr.prod.s:57769 TIME_WAIT - tcp 0 0 youcl.com:http sg2nlhg008.shr.prod.s:35270 TIME_WAIT - tcp 0 0 youcl.com:http sg2nlhg009.shr.prod.s:41637 TIME_WAIT - tcp 0 0 youcl.com:http sg2nlhg009.shr.prod.s:41614 TIME_WAIT - unix 2 [ ] STREAM CONNECTED 88586726 10394/httpd
20.显示RAW网络统计信息
# netstat --statistics --raw Ip: 62175683 total packets received 52970 with invalid addresses 0 forwarded Icmp: 875519 ICMP messages received destination unreachable: 901671 echo request: 8 echo replies: 16253 IcmpMsg: InType0: 83 IpExt: InMcastPkts: 117就是这样，如果你正在寻找更多的信息和netstat命令的选项，请参阅netstat的手动文档或使用 人netstat命令来了解所有的信息。如果我们错过了列表中的任何内容，请使用下面的评论部分告知我们。因此，我们可以根据您的意见不断更新此列表。
