I have used ping – send ICMP ECHO_REQUEST to network hosts<\/p>from – man page of ping<\/cite><\/blockquote><\/figure>\n\n\n\n An IP header without options is 20 bytes. An ICMP ECHO_REQUEST packet contains an additional 8 bytes worth of ICMP header followed by an arbitrary amount of data. <\/p>\n\n\n\n Options available that I can use are<\/p>\n\n\n\n ping [-aAbBdDfhLnOqrRUvV46] [-c count] [-F flowlabel] [-i interval] [-I interface] [-l preload] [-m mark] [-M pmtudisc_option] [-N nodeinfo_option] [-w deadline] [-W timeout] [-p pattern] [-Q tos] [-s packetsize] [-S<\/p> sndbuf] [-t ttl] [-T timestamp option] [hop \u2026] destination<\/p><\/blockquote><\/figure>\n\n\n\n Stop after sending count ECHO_REQUEST packets. With deadline option, ping waits for count ECHO_REPLY packets, until the timeout expires.<\/p>from official man pages<\/cite><\/blockquote><\/figure>\n\n\n\n Specifies the number of data bytes to be sent. The default is 56, which translates into 64 ICMP data bytes when combined with the 8 bytes of ICMP header data.<\/p>from official man pages<\/cite><\/blockquote><\/figure>\n\n\n\n dig is a flexible tool for interrogating DNS name servers. It performs DNS lookups and displays the answers that are returned from the name server(s) that were queried.<\/p>\n\n\n\n Utility to investigate sockets (Socket Statistics), similar to Shows detailed information<\/p>\n\n\n\n Ping I have used ping often but never to an extend that I could understand the complete range of options and power available at hand. ping – send ICMP ECHO_REQUEST to network hosts from – man page of ping ICMP Packet details An IP header without options is 20 bytes. An ICMP ECHO_REQUEST packet contains […]<\/p>\n","protected":false},"author":2,"featured_media":1087,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"image","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[34],"tags":[112,116,115],"class_list":["post-1083","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-technical","tag-linux","tag-technical","tag-utils","post_format-post-format-image"],"_links":{"self":[{"href":"https:\/\/blog.samarthya.me\/wps\/wp-json\/wp\/v2\/posts\/1083","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.samarthya.me\/wps\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.samarthya.me\/wps\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.samarthya.me\/wps\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.samarthya.me\/wps\/wp-json\/wp\/v2\/comments?post=1083"}],"version-history":[{"count":0,"href":"https:\/\/blog.samarthya.me\/wps\/wp-json\/wp\/v2\/posts\/1083\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.samarthya.me\/wps\/wp-json\/wp\/v2\/media\/1087"}],"wp:attachment":[{"href":"https:\/\/blog.samarthya.me\/wps\/wp-json\/wp\/v2\/media?parent=1083"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.samarthya.me\/wps\/wp-json\/wp\/v2\/categories?post=1083"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.samarthya.me\/wps\/wp-json\/wp\/v2\/tags?post=1083"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}ping<\/code> often but never to an extend that I could understand the complete range of options and power available at hand.<\/p>\n\n\n\nICMP Packet details<\/h2>\n\n\n\n
Examples<\/h2>\n\n\n\n
ping hostname #www.samarthya.me<\/code><\/pre>\n\n\n\nping www.samarthya.me\nPING samarthya.me (148.72.168.185) 56(84) bytes of data.\n64 bytes from server4.hostsoch.in (148.72.168.185): icmp_seq=1 ttl=53 time=251 ms\n64 bytes from server4.hostsoch.in (148.72.168.185): icmp_seq=8 ttl=53 time=252 ms\n^C\n--- samarthya.me ping statistics ---\n2 packets transmitted, 2 received, 0% packet loss, time 2007ms\nrtt min\/avg\/max\/mdev = 250.972\/251.358\/252.325\/0.657 ms<\/code><\/pre>\n\n\n\nping ip #148.32.168.185<\/code><\/pre>\n\n\n\nping 148.72.168.185\nPING 148.72.168.185 (148.72.168.185) 56(84) bytes of data.\n64 bytes from 148.72.168.185: icmp_seq=1 ttl=53 time=251 ms\n64 bytes from 148.72.168.185: icmp_seq=2 ttl=53 time=251 ms\n64 bytes from 148.72.168.185: icmp_seq=3 ttl=53 time=251 ms\n^C\n--- 148.72.168.185 ping statistics ---\n3 packets transmitted, 3 received, 0% packet loss, time 2002ms\nrtt min\/avg\/max\/mdev = 251.039\/251.231\/251.438\/0.601 ms<\/code><\/pre>\n\n\n\n-c [COUNT] <\/h2>\n\n\n\n
ping -c 10 10.0.1.11\nPING 10.0.1.11 (10.0.1.11) 56(84) bytes of data.\n64 bytes from 10.0.1.11: icmp_seq=1 ttl=64 time=0.609 ms\n64 bytes from 10.0.1.11: icmp_seq=2 ttl=64 time=0.624 ms\n64 bytes from 10.0.1.11: icmp_seq=3 ttl=64 time=0.586 ms\n64 bytes from 10.0.1.11: icmp_seq=4 ttl=64 time=0.603 ms\n64 bytes from 10.0.1.11: icmp_seq=5 ttl=64 time=0.624 ms\n64 bytes from 10.0.1.11: icmp_seq=6 ttl=64 time=0.602 ms\n64 bytes from 10.0.1.11: icmp_seq=7 ttl=64 time=0.688 ms\n64 bytes from 10.0.1.11: icmp_seq=8 ttl=64 time=0.620 ms\n64 bytes from 10.0.1.11: icmp_seq=9 ttl=64 time=0.663 ms\n64 bytes from 10.0.1.11: icmp_seq=10 ttl=64 time=0.604 ms\n\n--- 10.0.1.11 ping statistics ---\n10 packets transmitted, 10 received, 0% packet loss, time 9000ms\nrtt min\/avg\/max\/mdev = 0.586\/0.622\/0.688\/0.035 ms<\/code><\/pre>\n\n\n\n-s [Packet Size]<\/h2>\n\n\n\n
ping -s 64 -c 2 10.0.1.11\nPING 10.0.1.11 (10.0.1.11) 64(92) bytes of data.\n72 bytes from 10.0.1.11: icmp_seq=1 ttl=64 time=0.665 ms\n72 bytes from 10.0.1.11: icmp_seq=2 ttl=64 time=0.612 ms\n\n--- 10.0.1.11 ping statistics ---\n2 packets transmitted, 2 received, 0% packet loss, time 1000ms\nrtt min\/avg\/max\/mdev = 0.612\/0.638\/0.665\/0.036 ms<\/code><\/pre>\n\n\n\nDIG<\/h1>\n\n\n\n
dig www.samarthya.me\n\n; <<>> DiG 9.11.4-P2-RedHat-9.11.4-16.P2.el7_8.6 <<>> www.samarthya.me\n;; global options: +cmd\n;; Got answer:\n;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48626\n;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 1\n\n;; OPT PSEUDOSECTION:\n; EDNS: version: 0, flags:; udp: 1220\n;; QUESTION SECTION:\n;www.samarthya.me. IN A\n\n;; ANSWER SECTION:\nwww.samarthya.me. 13357 IN CNAME samarthya.me.\nsamarthya.me. 13357 IN A 148.72.168.185\n\n;; Query time: 221 msec\n;; SERVER: 192.19.189.10#53(192.19.189.10)\n;; WHEN: Tue Oct 13 08:05:36 UTC 2020\n;; MSG SIZE rcvd: 75<\/code><\/pre>\n\n\n\nss<\/h2>\n\n\n\n
netstat<\/code><\/p>\n\n\n\nss -e --extended<\/code><\/pre>\n\n\n\nss -e\nNetid State Recv-Q Send-Q Local Address:Port Peer Address:Port \nu_str ESTAB 0 0 \/run\/dbus\/system_bus_socket 14506 * 14457 <->\nu_str ESTAB 0 0 * 13157 * 13158 <->\nu_str ESTAB 0 0 * 17900 * 17901 <->\nu_str ESTAB 0 0 * 17937 * 17936 <->\nu_str ESTAB 0 0 * 17909 * 17910 <->\nu_str ESTAB 0 0 * 17888 * 17887 <->\nu_str ESTAB 0 0 * 17922 * 17921 <\/code><\/pre>\n\n\n\nss -l # All listening ports<\/code><\/pre>\n\n\n\nss -l\nNetid State Recv-Q Send-Q Local Address:Port Peer Address:Port \nnl UNCONN 0 0 rtnl:kernel * \nnl UNCONN 768 0 tcpdiag:kernel * \nnl UNCONN 4352 0 tcpdiag:ss\/11768 * \nnl UNCONN 0 0 xfrm:kernel * \nnl UNCONN 0 0 selinux:systemd\/1 * \nnl UNCONN 0 0 selinux:dbus-daemon\/492 * \nnl UNCONN 0 0 selinux:kernel * \nnl UNCONN 0 0 selinux:dbus-daemon\/492 * \nnl UNCONN 0 0 selinux:systemd\/1 * \nnl UNCONN 0 0 audit:systemd\/1 * \nnl UNCONN 0 0 audit:auditd\/422 * \nnl UNCONN 0 0 audit:kernel * \nnl UNCONN 0 0 fiblookup:kernel * \nnl UNCONN 0 0 connector:kernel * \nnl UNCONN 0 0 nft:kernel * \nnl UNCONN 0 0 uevent:kernel * \nnl UNCONN 0 0 uevent:systemd-udevd\/393 * \nnl UNCONN 0 0 uevent:systemd\/1 * \nnl UNCONN 0 0 uevent:-4117 * \nnl UNCONN 0 0 uevent:tuned\/907 * \nnl UNCONN 0 0 uevent:-4107 * <\/code><\/pre>\n\n\n\nss -s #summary<\/code><\/pre>\n\n\n\nss -s\nTotal: 226 (kernel 0)\nTCP: 8 (estab 2, closed 1, orphaned 0, synrecv 0, timewait 0\/0), ports 0\n\nTransport Total IP IPv6\n* 0 - - \nRAW 0 0 0 \nUDP 3 2 1 \nTCP 7 4 3 \nINET 10 6 4 \nFRAG 0 0 0 <\/code><\/pre>\n\n\n\nss -ta #all tcp ports<\/code><\/pre>\n\n\n\nss -t -a\nState Recv-Q Send-Q Local Address:Port Peer Address:Port \nLISTEN 0 128 127.0.0.1:10248 *:* \nLISTEN 0 128 *:sunrpc *:* \nLISTEN 0 10 127.0.0.1:45556 *:* \nLISTEN 0 5 192.168.122.1:domain *:* \nLISTEN 0 128 *:ssh *:* \nLISTEN 0 128 127.0.0.1:ipp *:* \nLISTEN 0 100 127.0.0.1:smtp *:* \nLISTEN 0 128 127.0.0.1:43483 *:* \nESTAB 0 0 10.80.241.80:ssh 10.52.43.159:51667 \nESTAB 0 0 10.80.241.80:ssh 10.52.43.159:51356 \nESTAB 0 0 10.80.241.80:39224 54.242.91.190:ssh \nESTAB 0 64 10.80.241.80:ssh 10.52.43.159:52010 \nLISTEN 0 128 [::]:7946 [::]:* \nLISTEN 0 128 [::]:10250 [::]:* \nLISTEN 0 128 [::]:sunrpc [::]:* \nLISTEN 0 128 [::]:ssh [::]:* \nLISTEN 0 128 [::1]:ipp [::]:* \nLISTEN 0 100 [::1]:smtp [::]:* <\/code><\/pre>\n\n\n\nss -tl # All TCP listening ports<\/code><\/pre>\n\n\n\nss -tl\nState Recv-Q Send-Q Local Address:Port Peer Address:Port \nLISTEN 0 128 127.0.0.1:10248 *:* \nLISTEN 0 128 *:sunrpc *:* \nLISTEN 0 10 127.0.0.1:45556 *:* \nLISTEN 0 5 192.168.122.1:domain *:* \nLISTEN 0 128 *:ssh *:* \nLISTEN 0 128 127.0.0.1:ipp *:* \nLISTEN 0 100 127.0.0.1:smtp *:* \nLISTEN 0 128 127.0.0.1:43483 *:* \nLISTEN 0 128 [::]:7946 [::]:* \nLISTEN 0 128 [::]:10250 [::]:* \nLISTEN 0 128 [::]:sunrpc [::]:* \nLISTEN 0 128 [::]:ssh [::]:* \nLISTEN 0 128 [::1]:ipp [::]:* \nLISTEN 0 100 [::1]:smtp [::]:* <\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"