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Linux系統(tǒng)查詢顯示端口信息用什么命令

時(shí)間: 加城1195 分享

  有時(shí)Linux系統(tǒng)需要查看端口信息和狀態(tài),用一個(gè)命令就能實(shí)現(xiàn),就是netstat命令,不過(guò)用法有很多,可以用來(lái)查詢網(wǎng)絡(luò)狀況,連接狀況等,具體怎么用呢,下面由學(xué)習(xí)啦小編為大家整理了linux的端口查詢命令的相關(guān)知識(shí),希望對(duì)大家有幫助!

  linux的端口查詢命令詳解

  顯示詳細(xì)的網(wǎng)絡(luò)狀況

  # netstat -a

  顯示當(dāng)前戶籍UDP連接狀況

  # netstat -nu

  顯示UDP端口號(hào)的使用情況

  # netstat -apu

  Active Internet connections (servers and established)

  Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name

  udp 0 0 *:32768 *:* -

  udp 0 0 *:nfs *:* -

  udp 0 0 *:641 *:* 3006/rpc.statd

  udp 0 0 192.168.0.3:netbios-ns *:* 3537/nmbd

  udp 0 0 *:netbios-ns *:* 3537/nmbd

  udp 0 0 192.168.0.3:netbios-dgm *:* 3537/nmbd

  udp 0 0 *:netbios-dgm *:* 3537/nmbd

  udp 0 0 *:tftp *:* 3346/xinetd

  udp 0 0 *:999 *:* 3366/rpc.rquotad

  udp 0 0 *:sunrpc *:* 2986/portmap

  udp 0 0 *:ipp *:* 6938/cupsd

  udp 0 0 *:1022 *:* 3392/rpc.mountd

  udp 0 0 *:638 *:* 3006/rpc.statd

  顯示網(wǎng)卡列表

  # 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 181864 0 0 0 141278 0 0 0 BMRU

  lo 16436 0 3362 0 0 0 3362 0 0 0 LRU

  顯示組播組的關(guān)系

  # netstat -g

  IPv6/IPv4 Group Memberships

  Interface RefCnt Group

  --------------- ------ ---------------------

  lo 1 ALL-SYSTEMS.MCAST.NET

  eth0 1 ALL-SYSTEMS.MCAST.NET

  lo 1 ff02::1

  eth0 1 ff02::1:ff0a:b0c

  eth0 1 ff02::1

  顯示網(wǎng)絡(luò)統(tǒng)計(jì)信息

  # netstat -s

  Ip:

  184695 total packets received

  0 forwarded

  0 incoming packets discarded

  184687 incoming packets delivered

  143917 requests sent out

  32 outgoing packets dropped

  30 dropped because of missing route

  Icmp:

  676 ICMP messages received

  5 input ICMP message failed.

  ICMP input histogram:

  destination unreachable: 44

  echo requests: 287

  echo replies: 345

  304 ICMP messages sent

  0 ICMP messages failed

  ICMP output histogram:

  destination unreachable: 17

  echo replies: 287

  Tcp:

  473 active connections openings

  28 passive connection openings

  4 failed connection attempts

  11 connection resets received

  1 connections established

  178253 segments received

  137936 segments send out

  29 segments retransmited

  0 bad segments received.

  336 resets sent

  Udp:

  5714 packets received

  8 packets to unknown port received.

  0 packet receive errors

  5419 packets sent

  TcpExt:

  1 resets received for embryonic SYN_RECV sockets

  ArpFilter: 0

  12 TCP sockets finished time wait in fast timer

  572 delayed acks sent

  3 delayed acks further delayed because of locked socket

  13766 packets directly queued to recvmsg prequeue.

  1101482 packets directly received from backlog

  19599861 packets directly received from prequeue

  46860 packets header predicted

  14541 packets header predicted and directly queued to user

  TCPPureAcks: 12259

  TCPHPAcks: 9119

  TCPRenoRecovery: 0

  TCPSackRecovery: 0

  TCPSACKReneging: 0

  TCPFACKReorder: 0

  TCPSACKReorder: 0

  TCPRenoReorder: 0

  TCPTSReorder: 0

  TCPFullUndo: 0

  TCPPartialUndo: 0

  TCPDSACKUndo: 0

  TCPLossUndo: 0

  TCPLoss: 0

  TCPLostRetransmit: 0

  TCPRenoFailures: 0

  TCPSackFailures: 0

  TCPLossFailures: 0

  TCPFastRetrans: 0

  TCPForwardRetrans: 0

  TCPSlowStartRetrans: 0

  TCPTimeouts: 29

  TCPRenoRecoveryFail: 0

  TCPSackRecoveryFail: 0

  TCPSchedulerFailed: 0

  TCPRcvCollapsed: 0

  TCPDSACKOldSent: 0

  TCPDSACKOfoSent: 0

  TCPDSACKRecv: 0

  TCPDSACKOfoRecv: 0

  TCPAbortOnSyn: 0

  TCPAbortOnData: 1

  TCPAbortOnClose: 0

  TCPAbortOnMemory: 0

  TCPAbortOnTimeout: 3

  TCPAbortOnLinger: 0

  TCPAbortFailed: 3

  TCPMemoryPressures: 0

  顯示監(jiān)聽(tīng)的套接口

  # netstat -l

  Active Internet connections (only servers)

  Proto Recv-Q Send-Q Local Address Foreign Address State

  tcp 0 0 *:32769 *:* LISTEN

  tcp 0 0 *:nfs *:* LISTEN

  tcp 0 0 *:644 *:* LISTEN

  tcp 0 0 *:1002 *:* LISTEN

  tcp 0 0 *:netbios-ssn *:* LISTEN

  tcp 0 0 *:sunrpc *:* LISTEN

  tcp 0 0 vm-dev:ipp *:* LISTEN

  tcp 0 0 *:telnet *:* LISTEN

  tcp 0 0 *:601 *:* LISTEN

  tcp 0 0 *:microsoft-ds *:* LISTEN

  tcp 0 0 *:http *:* LISTEN

  tcp 0 0 *:ssh *:* LISTEN

  tcp 0 0 *:https *:* LISTEN

  udp 0 0 *:32768 *:*

  udp 0 0 *:nfs *:*

  udp 0 0 *:641 *:*

  udp 0 0 192.168.0.3:netbios-ns *:*

  udp 0 0 *:netbios-ns *:*

  udp 0 0 192.168.0.3:netbios-dgm *:*

  udp 0 0 *:netbios-dgm *:*

  udp 0 0 *:tftp *:*

  udp 0 0 *:999 *:*

  udp 0 0 *:sunrpc *:*

  udp 0 0 *:ipp *:*

  udp 0 0 *:1022 *:*

  udp 0 0 *:638 *:*

  Active UNIX domain sockets (only servers)

  Proto RefCnt Flags Type State I-Node Path

  unix 2 [ ACC ] STREAM LISTENING 10621 @/tmp/fam-root-

  unix 2 [ ACC ] STREAM LISTENING 7096 /var/run/acpid.socket

  unix 2 [ ACC ] STREAM LISTENING 9792 /tmp/.gdm_socket

  unix 2 [ ACC ] STREAM LISTENING 9927 /tmp/.X11-unix/X0

  unix 2 [ ACC ] STREAM LISTENING 10489 /tmp/ssh-lbUnUf4552/agent.4552

  unix 2 [ ACC ] STREAM LISTENING 10558 /tmp/ksocket-root/kdeinit__0

  unix 2 [ ACC ] STREAM LISTENING 10560 /tmp/ksocket-root/kdeinit-:0

  unix 2 [ ACC ] STREAM LISTENING 10570 /tmp/.ICE-unix/dcop4664-1270815442

  unix 2 [ ACC ] STREAM LISTENING 10843 /tmp/.ICE-unix/4735

  unix 2 [ ACC ] STREAM LISTENING 10591 /tmp/ksocket-root/klauncherah3arc.slave-socket

  unix 2 [ ACC ] STREAM LISTENING 7763 /var/run/iiim/.iiimp-unix/9010

  unix 2 [ ACC ] STREAM LISTENING 11047 /tmp/orbit-root/linc-1291-0-1e92c8082411

  unix 2 [ ACC ] STREAM LISTENING 11053 /tmp/orbit-root/linc-128e-0-dc070659cbb3

  unix 2 [ ACC ] STREAM LISTENING 8020 /var/run/dbus/system_bus_socket

  unix 2 [ ACC ] STREAM LISTENING 58927 /tmp/mcop-root/vm-dev-2c28-4beba75f

  unix 2 [ ACC ] STREAM LISTENING 7860 /tmp/.font-unix/fs7100

  unix 2 [ ACC ] STREAM LISTENING 7658 /dev/gpmctl

  unix 2 [ ACC ] STREAM LISTENING 10498 @/tmp/dbus-s2MLJGO5Ci

  相關(guān)閱讀:Linux系統(tǒng)常見(jiàn)故障現(xiàn)象

  1. MBR中g(shù)rub損壞,1_5階段的數(shù)據(jù)損壞,2階段的grub損壞

  2. initramfs*.img文件損壞,內(nèi)核文件損壞

  3. /boot/grub/grub.conf文件丟失

  4. /etc/fstab丟失,無(wú)法掛載根等文件系統(tǒng)

  5. /boot 目錄全部的文件丟失

  6. root密碼忘記

  7. 為grub設(shè)置密碼,開(kāi)機(jī)時(shí)生效,保護(hù)root密碼被惡意修改等

  二、常見(jiàn)故障的分析解決:

  1. 1階段和1_5階段出問(wèn)題時(shí)會(huì)開(kāi)機(jī)執(zhí)行完BIOS自檢后直接報(bào)錯(cuò)

  2. 前面兩個(gè)階段順利通過(guò),到了執(zhí)行/boot/ 下面的第二個(gè)階段時(shí)的程序調(diào)用/boot/grub/grub.conf 時(shí)文件丟失或者/boot/下內(nèi)核文件和initramfs*.img 文件丟失都會(huì)造成卡在第二個(gè)階段:丟失initramfs文件時(shí)會(huì)在過(guò)了開(kāi)機(jī)選擇內(nèi)核啟動(dòng)之后卡住不動(dòng),沒(méi)有任何提示(在/boot/grub /grub.conf 配置文件中定義了timeout時(shí)間,會(huì)過(guò)了倒計(jì)時(shí),然后沒(méi)有任何提示)如果是丟失grub.conf 是會(huì)進(jìn)入grub>提示符由管理員指定內(nèi)核文件和initramfs文件位置

  3. /etc/fstab丟失:

  系統(tǒng)可以開(kāi)機(jī),但是開(kāi)機(jī)時(shí)會(huì)卡好長(zhǎng)時(shí)間,因?yàn)樵S多服務(wù)等待超時(shí)無(wú)法啟動(dòng),此時(shí)磁盤按照默認(rèn)以只讀掛載根,這個(gè)掛載是在開(kāi)機(jī)時(shí)掛載的,因?yàn)闆](méi)有fstab文件所以無(wú)法重新掛載根文件系統(tǒng)以及其他的系統(tǒng),沒(méi)有運(yùn)行級(jí)別

  4. 為grub設(shè)置了密碼會(huì)在開(kāi)機(jī)進(jìn)入內(nèi)核啟動(dòng)時(shí),想要修改grub和內(nèi)核的參數(shù)或者進(jìn)入系統(tǒng)時(shí)需要輸入密碼,當(dāng)然忘記這樣的密碼也只能使用光盤引導(dǎo)進(jìn)入救援模式修改配置文件/etc/grub/grub.conf 把相應(yīng)的密碼行刪除即可。

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