{"id":129,"date":"2024-10-12T20:13:15","date_gmt":"2024-10-12T20:13:15","guid":{"rendered":"http:\/\/linuxresellerwebhosting.in\/blog\/?p=129"},"modified":"2024-10-14T04:22:17","modified_gmt":"2024-10-14T04:22:17","slug":"troubleshooting-network-related-issues-using-netstat-command","status":"publish","type":"post","link":"https:\/\/linuxresellerwebhosting.in\/blog\/troubleshooting-network-related-issues-using-netstat-command\/","title":{"rendered":"How To Troubleshooting Network Related Issues using NETSTAT Command"},"content":{"rendered":"

Hi all !<\/span><\/span><\/p>\n

In this tutorail, we are going to see NETSTAT command-line utility. <\/span><\/span><\/p>\n

Netstat is a command line utility that can be used to list out all the network (socket) connections on a system. It lists out all the tcp, udp socket connections and the unix socket connections.\u00a0<\/span><\/span>The asnwer is both network and hosting server<\/a> administrator can use it to trouble shoot networkmconnection related issues. Netstat displays protocol statistics and current TCP\/IP network connections using the following command switches:<\/span> <\/span><\/span><\/p>\n

NETSTAT [-a] [-e] [-n] [-s] [-p propto] [-r] [interval]<\/h3>\n

 <\/p>\n

-a Displays all connections and listening ports.<\/p>\n

-e Displays Ethernet statistics. This may be combined with the -s option.<\/p>\n

-n Displays addresses and port numbers in numerical form.<\/p>\n

-o Displays the owning process ID associated with each connection.<\/p>\n

-p proto Shows connections for the protocol specified by proto; proto may be any of: TCP, UDP,
\nTCPv6, or UDPv6. If used with option to display per-protocol statistics, proto may be any
\nof: IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, or UDPv6.<\/p>\n

-r Displays the routing table.<\/p>\n

-s Displays per-protocol statistics. By default, statistics are
\nshown for IP, IPv6, ICMP, ICMPv6, TCP, TCPv6, UDP, and UDPv6;
\nthe<\/p>\n

-p option may be used to specify a subset of the default.
\ninterval Redisplays selected statistics, pausing interval seconds between each display. Press CTRL+C to stop redisplaying statistics. If omitted, netstat will print the current configuration information once.<\/p>\n

To display the routing table:<\/p>\n

#netstat -rn<\/pre>\n
-r: Kernel routing tables.
\n-n: Shows numerical addresses instead of trying to determine hosts.<\/p>\n
To display the extended interfaces statistics:<\/p>\n
#netstat -ie<\/pre>\n
-i: Interface
\n-e: Extended information<\/p>\n
To display all the opened network sockets:<\/p>\n
#netstat -uta<\/pre>\n
-u: UDP
\n-t: TCP
\n-a: All<\/p>\n
To display all the listening state sockets:<\/p>\n
#netstat -lt<\/pre>\n
-t: TCP
\n-l: Listening state sockets<\/p>\n
To display the quick interfaces statistics:<\/p>\n
#netstat -i<\/pre>\n
-i: Interface<\/p>\n
To display the summary statistics for each protocol<\/p>\n
#netstat -s<\/pre>\n
-s: Summary statistics for each protocol.<\/p>\n
Ip:
\n604 total packets received
\n1 with invalid addresses
\n0 forwarded
\n0 incoming packets discarded
\n485 incoming packets delivered
\n507 requests sent out<\/p>\n
Icmp:
\n0 ICMP messages received
\n0 input ICMP message failed.
\nICMP input histogram:
\n0 ICMP messages sent
\n0 ICMP messages failed
\nICMP output histogram:<\/p>\n
Tcp:
\n21 active connections openings
\n4 passive connection openings
\n0 failed connection attempts
\n0 connection resets received
\n3 connections established
\n351 segments received
\n388 segments send out
\n0 segments retransmited
\n0 bad segments received
\n2 resets sent<\/p>\n
Udp:
\n119 packets received
\n0 packets to unknown port received.
\n0 packet receive errors
\n119 packets sent<\/p>\n
TcpExt:
\n5 TCP sockets finished time wait in fast timer
\n21 delayed acks sent
\nQuick ack mode was activated 10 times
\n31 packets directly queued to recvmsg prequeue.
\n15765 of bytes directly received from prequeue
\n105 packet headers predicted
\n17 packets header predicted and directly queued to user
\n36 acknowledgments not containing data received
\n11 predicted acknowledgments
\n0 TCP data loss events<\/p>\n
By using these netstat<\/code> commands and analyzing the results, you can diagnose many common network & server<\/a> -related issues, such as port conflicts, dropped packets, or misconfigured routing tables.<\/p>\n","protected":false},"excerpt":{"rendered":"
Hi all ! In this tutorail, we are going to see NETSTAT command-line utility. Netstat is a command line utility<\/p>\n","protected":false},"author":1,"featured_media":969,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","footnotes":""},"categories":[1],"tags":[],"class_list":["post-129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/posts\/129","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/comments?post=129"}],"version-history":[{"count":19,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/posts\/129\/revisions"}],"predecessor-version":[{"id":148,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/posts\/129\/revisions\/148"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/media\/969"}],"wp:attachment":[{"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/media?parent=129"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/categories?post=129"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/linuxresellerwebhosting.in\/blog\/wp-json\/wp\/v2\/tags?post=129"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}