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		<h1>10 ví dụ về lệnh Netstat trên Linux</h1>
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			<li>Thứ sáu - 18/12/2020 23:58</li>
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			<img alt="10 ví dụ về lệnh Netstat trên Linux" src="https://st.quantrimang.com/photos/image/2020/12/18/lenh-netstat-tren-linux-1.jpg" width="460" class="img-thumbnail" />
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			<p style="text-align: justify;">Netstat là một tiện ích dòng lệnh có thể được sử dụng để liệt kê tất cả các kết nối mạng (socket), cho phép so sánh với các kết nối mạng, bảng định tuyến, bản ghi interface, kết nối giả mạo, v.v... Bài viết này sẽ chia sẻ với bạn đọc 10 ví dụ hàng đầu về lệnh Netstat trên&nbsp;Linux.</p>

<figure>
<div style="text-align: justify;"><img alt="Netstat là một tiện ích dòng lệnh hữu ích trong Linux" data-i="0" data-src="https://st.quantrimang.com/photos/image/2020/12/18/lenh-netstat-tren-linux-1.jpg" data-was-processed="true" height="366" src="https://st.quantrimang.com/photos/image/2020/12/18/lenh-netstat-tren-linux-1.jpg" width="650" /></div>

<figcaption>
<div style="text-align: justify;">Netstat là một tiện ích dòng lệnh hữu ích trong Linux</div>
</figcaption>
</figure>

<h2 style="text-align: justify;">Listening và non-listening socket</h2>

<p style="text-align: justify;">Để hiển thị về các listening và non-listening socket, hãy sử dụng lệnh sau:</p>

<pre id="pre0">
<code>$ netstat -all</code></pre>

<p style="text-align: justify;">Đầu ra mẫu sẽ trông giống như sau:</p>

<pre id="pre1">
<code>Active Internet connections (servers and established)
 Proto Recv-Q Send-Q Local Address Foreign Address State
 tcp 0 0 localhost:mysql *:* LISTEN
 tcp 0 0 linux-Inspiron-3:domain *:* LISTEN
 tcp 0 0 linux-Inspiron-35:46930 ec2-54-236-207-15:https ESTABLISHED
 tcp 0 0 linux-Inspiron-35:59820 maa03s22-in-f14.1:https ESTABLISHED
 tcp 0 0 linux-Inspiron-35:46662 sc-in-f188.1e100.n:5228 ESTABLISHED
 tcp 0 0 linux-Inspiron-35:41914 bom05s08-in-f4.1e:https ESTABLISHED
 tcp 0 0 linux-Inspiron-35:59760 maa03s22-in-f14.1:https ESTABLISHED
 tcp 0 0 linux-Inspiron-35:33172 ec2-54-221-62-191:https ESTABLISHED
 tcp 0 0 linux-Inspiron-35:43466 ec2-34-192-133-18:https ESTABLISHED
 tcp 0 0 linux-Inspiron-35:43480 a104-81-21-73.depl:http TIME_WAIT
 tcp 0 0 linux-Inspiron-35:36270 maa03s20-in-f14.1:https ESTABLISHED
 tcp 0 0 linux-Inspiron-35:53360 maa03s20-in-f3.1e1:http ESTABLISHED
 ........................................................................................</code></pre>

<h2 style="text-align: justify;">PID và tên của chương trình</h2>

<p style="text-align: justify;">Để hiển thị PID và tên của chương trình mà mỗi socket thuộc về, hãy sử dụng lệnh sau:</p>

<pre id="pre2">
<code>$ netstat --program</code></pre>

<p style="text-align: justify;">Đầu ra mẫu sẽ trông giống như sau:</p>

<pre id="pre3">
<code>Active Internet connections (w/o servers)
 Proto    Recv-Q    Send-Q    Local Address    Foreign Address    State PID/Program name
 tcp       0          0 linux-Inspiron-35:46930 ec2-54-236-207-15:https ESTABLISHED 23074/chrome
 tcp       0          0 linux-Inspiron-35:59820 maa03s22-in-f14.1:https ESTABLISHED 23235/chromium-brow
 tcp       0          0 linux-Inspiron-35:46662 sc-in-f188.1e100.n:5228 ESTABLISHED 23074/chrome
 tcp       0          0 linux-Inspiron-35:41914 bom05s08-in-f4.1e:https ESTABLISHED 23074/chrome
 tcp       1          0 linux-Inspiron-35:60770 117.18.237.42:http CLOSE_WAIT 23074/chrome
 tcp       0          0 linux-Inspiron-35:43466 ec2-34-192-133-18:https ESTABLISHED 23074/chrome
 ............................................................................................</code></pre>

<h2 style="text-align: justify;">Thông tin cổng TCP</h2>

<p style="text-align: justify;">Để lấy thông tin về các cổng TCP, hãy sử dụng lệnh sau:</p>

<pre id="pre4">
<code>$ netstat --tcp</code></pre>

<p style="text-align: justify;">Đầu ra mẫu sẽ trông giống như sau:</p>

<pre id="pre5">
<code>Active Internet connections (w/o servers)
 Proto    Recv-Q    Send-Q L   ocal Address    Foreign Address State
 tcp       0          0 linux-Inspiron-35:36310 maa03s20-in-f14.1:https ESTABLISHED
 tcp       0          0 linux-Inspiron-35:46930 ec2-54-236-207-15:https ESTABLISHED
 tcp       0          0 linux-Inspiron-35:46662 sc-in-f188.1e100.n:5228 ESTABLISHED
 tcp       0          0 linux-Inspiron-35:36320 maa03s20-in-f14.1:https ESTABLISHED
 tcp       0          0 linux-Inspiron-35:33216 ec2-54-221-62-191:https ESTABLISHED
 tcp       0          0 linux-Inspiron-35:46478 arn02s05-in-f3.1e:https ESTABLISHED
 tcp       0          0 linux-Inspiron-35:43466 ec2-34-192-133-18:https ESTABLISHED
 tcp       0          0 linux-Inspiron-35:60794 117.18.237.42:http ESTABLISHED
 tcp       0          0 linux-Inspiron-35:48080 104.244.42.136:https ESTABLISHED
 tcp       0          0 linux-Inspiron-35:58048 ip-166-62-112-150.:http ESTABLISHED
 tcp       0          0 linux-Inspiron-35:33272 bom05s08-in-f163.:https ESTABLISHED</code></pre>

<h2 style="text-align: justify;">Thông tin về cổng UDP</h2>

<p style="text-align: justify;">Để nhận thông tin cổng UDP, hãy sử dụng lệnh sau:</p>

<pre id="pre6">
<code>$ netstat --udp</code></pre>

<p style="text-align: justify;">Đầu ra mẫu sẽ trông giống như sau:</p>

<pre id="pre7">
<code>Active Internet connections (w/o servers)
 Proto Recv-Q Send-Q   Local Address            Foreign Address          State
 udp    0       0    linux-Inspiron-35:46539    maa03s20-in-f5.1e:https  ESTABLISHED
 udp   768      0    localhost:46996            linux-Inspiron-3:domain  ESTABLISHED</code></pre>

<h2 style="text-align: justify;">Danh sách các cổng Linux</h2>

<p style="text-align: justify;">Để lấy danh sách các cổng Linux, hãy sử dụng lệnh sau:</p>

<pre id="pre8">
<code>$ netstat -lx</code></pre>

<p style="text-align: justify;">Đầu ra mẫu sẽ trông giống như sau:</p>

<pre id="pre9">
<code>Active UNIX domain sockets (only servers)
 Proto    RefCnt    Flags    Type       State     I-Node    Path
 unix       2       &#91; ACC &#93; STREAM    LISTENING    27810    @/tmp/.ICE-unix/2345
 unix       2       &#91; ACC &#93; STREAM    LISTENING    26776    @/tmp/ibus/dbus-RkYlcXlm
 unix       2       &#91; ACC &#93; STREAM    LISTENING    20175    /var/run/mysqld/mysqld.sock
 unix       2       &#91; ACC &#93; STREAM    LISTENING    25423    /run/user/1000/systemd/private
 unix       2       &#91; ACC &#93; STREAM    LISTENING    24848    /run/user/126/systemd/private
 unix       2       &#91; ACC &#93; SEQPACKET LISTENING    1784    /run/udev/control
 unix       2       &#91; ACC &#93; STREAM    LISTENING    25933    /run/user/1000/keyring/control
 unix       2       &#91; ACC &#93; STREAM    LISTENING    22555    /var/run/NetworkManager/private-dhcp
 unix       2       &#91; ACC &#93; STREAM    LISTENING    24475    /run/user/1000/keyring/pkcs11
 unix       2       &#91; ACC &#93; STREAM    LISTENING    24477    /run/user/1000/keyring/ssh
 unix       2       &#91; ACC &#93; STREAM    LISTENING    112357    /tmp/.com.google.Chrome.3r7jSQ/SingletonSocket</code></pre>

<ul>
	<li style="text-align: justify;"><a href="https://quantrimang.com/lenh-history-trong-linux-175713" title="Cách sử dụng lệnh history trong Linux">Cách sử dụng lệnh history trong Linux</a></li>
</ul>

<h2 style="text-align: justify;">Hiển thị bảng định tuyến</h2>

<p style="text-align: justify;">Để hiển thị bảng định tuyến, hãy sử dụng lệnh sau:</p>

<pre id="pre10">
<code>$ netstat -r</code></pre>

<p style="text-align: justify;">Đầu ra mẫu sẽ trông giống như sau:</p>

<pre id="pre11">
<code>Kernel IP routing table
 Destination    Gateway          Genmask       Flags    MSS    Window    irtt    Iface
 default       TutorialsPoint1    0.0.0.0       UG       0       0         0     enp7s0
 default       192.168.1.254      0.0.0.0       UG       0       0         0     wlp6s0
 link-local    *                  255.255.0.0   U        0       0         0     enp7s0
 192.168.1.0   *                  255.255.255.0 U        0       0         0     enp7s0
 192.168.1.0   *                  255.255.255.0 U        0       0         0     wlp6s0</code></pre>

<h2 style="text-align: justify;">Hiển thị thống kê mạng</h2>

<p style="text-align: justify;">Để hiển thị thống kê mạng, hãy sử dụng lệnh sau:</p>

<pre id="pre12">
<code>$ netstat -s</code></pre>

<p style="text-align: justify;">Đầu ra mẫu sẽ trông giống như sau:</p>

<pre id="pre13">
<code>Ip:
    226777 total packets received
    99 with invalid addresses
    0 forwarded
    0 incoming packets discarded
    213036 incoming packets delivered
    126141 requests sent out
    48 outgoing packets dropped
 Icmp:
    420 ICMP messages received
    120 input ICMP message failed.
    ICMP input histogram:
       destination unreachable: 414
       echo requests: 6
    576 ICMP messages sent
    0 ICMP messages failed
    ICMP output histogram:
       destination unreachable: 570
       echo replies: 6
 IcmpMsg:
    InType3: 414
    InType8: 6
    OutType0: 6
    OutType3: 570
 ....................................................................................</code></pre>

<h2 style="text-align: justify;">Các họ địa chỉ không được hỗ trợ</h2>

<p style="text-align: justify;">Để tìm các họ địa chỉ không được hỗ trợ, hãy sử dụng lệnh sau:</p>

<pre id="pre14">
<code>$ netstat -v</code></pre>

<p style="text-align: justify;">Đầu ra mẫu sẽ trông giống như sau:</p>

<pre id="pre15">
<code>Active Internet connections (w/o servers)
 Proto    Recv-Q    Send-Q    Local Address             Foreign Address             State
 tcp       0          0    linux-Inspiron-35:46930    ec2-54-236-207-15:https    ESTABLISHED
 tcp       0          0    linux-Inspiron-35:39418    arn09s10-in-f14.1:https    ESTABLISHED
 tcp       0          0    linux-Inspiron-35:36398    maa03s20-in-f14.1:https    ESTABLISHED
 tcp       0          0    linux-Inspiron-35:59950    maa03s22-in-f14.1:https    ESTABLISHED
 tcp       0          0    linux-Inspiron-35:60888    117.18.237.42:http         ESTABLISHED
 tcp       0          0    linux-Inspiron-35:55716    maa03s20-in-f3.1e:https    TIME_WAIT
 tcp       0          0    linux-Inspiron-35:42044    bom05s08-in-f4.1e:https    ESTABLISHED
 tcp       0          0    linux-Inspiron-35:49654    ec2-54-221-3-35.c:https    ESTABLISHED
 tcp       0          0    linux-Inspiron-35:47238    sc-in-f188.1e100.n:5228    ESTABLISHED
 tcp       0          0    linux-Inspiron-35:42046    bom05s08-in-f4.1e:https    ESTABLISHED
 ...........................................................................................</code></pre>

<h2 style="text-align: justify;">Thông tin mạng</h2>

<p style="text-align: justify;">Để hiển thị thông tin khác/thêm về mạng, hãy sử dụng lệnh sau:</p>

<pre id="pre16">
<code>$ netstat -e</code></pre>

<p style="text-align: justify;">Đầu ra mẫu sẽ trông giống như sau:</p>

<pre id="pre17">
<code>Active Internet connections (w/o servers)
 Proto    Recv-Q    Send-Q    Local Address             Foreign Address           State       User    Inode
 tcp       0          0    linux-Inspiron-35:46930    ec2-54-236-207-15:https  ESTABLISHED    linux   123811
 tcp       0          0    linux-Inspiron-35:55458    52.222.136.134:https     ESTABLISHED    linux   148067
 tcp       0          0    linux-Inspiron-35:43780    sb-in-f188.1e100.n:5228  ESTABLISHED    linux   147150
 tcp       0          0    linux-Inspiron-35:60924    117.18.237.42:http ESTAB    LISHED      linux   148291
 tcp       0          0    linux-Inspiron-35:36446    maa03s20-in-f14.1:https   ESTABLISHED   linux   148068
 tcp       0          0    linux-Inspiron-35:51126    edge-star-mini-sh:https   ESTABLISHED   linux   149411
 tcp       0          0    linux-Inspiron-35:33338    ec2-54-221-62-191:https   CLOSE_WAIT    linux   146371
 udp       0          0    linux-Inspiron-35:46539    maa03s20-in-f5.1e:https   ESTABLISHED   linux   117623
 udp      768         0    localhost:46996            linux-Inspiron-3:domain   ESTABLISHED   linux   123551
 ..................................................................................</code></pre>

<h2 style="text-align: justify;">Nhận trợ giúp từ Netstat</h2>

<p style="text-align: justify;">Để nhận được sự trợ giúp từ netstat, hãy sử dụng lệnh sau:</p>

<pre id="pre18">
<code>$ netstat -h</code></pre>

<p style="text-align: justify;">Đầu ra mẫu sẽ trông giống như sau:</p>

<pre id="pre19">
<code>usage: netstat &#91;-vWeenNcCF&#93; &#91;&#93; -r    netstat {-V|--version|-h|--help}
        netstat &#91;-vWnNcaeol&#93; &#91; ...&#93;
        netstat { &#91;-vWeenNac&#93; -i | &#91;-cWnNe&#93; -M | -s }
 -r, --route             display routing table
 -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
 -W, --wide             don&#039;t truncate IP addresses
 -n, --numeric          don&#039;t resolve names
 --numeric-hosts          don&#039;t resolve host names
 --numeric-ports          don&#039;t resolve port names
 --numeric-users          don&#039;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 c      ontinuous 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|--tcp} {-u|--udp} {-w|--raw} {-x|--unix} --ax25 --ipx --netrom
 =Use &#039;-6|-4&#039; or &#039;-A &#039; or &#039;--&#039;; default: inet
 List of possible address families (which support routing):
 inet (DARPA Internet) inet6 (IPv6) ax25 (AMPR AX.25)
 netrom (AMPR NET/ROM) ipx (Novell IPX) ddp (Appletalk DDP)
 x25 (CCITT X.25)</code></pre>
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