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  • 學習啦 > 學習電腦 > 操作系統(tǒng) > Linux教程 >

    Linux系統(tǒng)查詢顯示端口信息用什么命令

    時間: 加城1195 分享

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

      linux的端口查詢命令詳解

      顯示詳細的網(wǎng)絡(luò)狀況

      # netstat -a

      顯示當前戶籍UDP連接狀況

      # netstat -nu

      顯示UDP端口號的使用情況

      # 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,開機時生效,保護root密碼被惡意修改等

      二、常見故障的分析解決:

      1. 1階段和1_5階段出問題時會開機執(zhí)行完BIOS自檢后直接報錯

      2. 前面兩個階段順利通過,到了執(zhí)行/boot/ 下面的第二個階段時的程序調(diào)用/boot/grub/grub.conf 時文件丟失或者/boot/下內(nèi)核文件和initramfs*.img 文件丟失都會造成卡在第二個階段:丟失initramfs文件時會在過了開機選擇內(nèi)核啟動之后卡住不動,沒有任何提示(在/boot/grub /grub.conf 配置文件中定義了timeout時間,會過了倒計時,然后沒有任何提示)如果是丟失grub.conf 是會進入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)可以開機,但是開機時會卡好長時間,因為許多服務等待超時無法啟動,此時磁盤按照默認以只讀掛載根,這個掛載是在開機時掛載的,因為沒有fstab文件所以無法重新掛載根文件系統(tǒng)以及其他的系統(tǒng),沒有運行級別

      4. 為grub設(shè)置了密碼會在開機進入內(nèi)核啟動時,想要修改grub和內(nèi)核的參數(shù)或者進入系統(tǒng)時需要輸入密碼,當然忘記這樣的密碼也只能使用光盤引導進入救援模式修改配置文件/etc/grub/grub.conf 把相應的密碼行刪除即可。

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