6. Why is it that an ICMP packet does not have source and destination port number? Solution: The ICMP packet does not have source and destination port numbers because it was designed to communicate network-layer information between hosts and routers, not between application layer processes.
As a general answer, the ICMP protocol does not use port number 7 which is a TCP and UDP service called echo that is absolute.
TCP and UDP have Ports, ICMP does not.
Ping uses ICMP(Internet Control Message Protocol). it does not use TCP or UDP. To be more precise ICMP type 8(echo request message) and type 0(echo reply message) are used. ICMP has no ports!
ICMP packets are IP packets with ICMP in the IP data portion. ICMP messages also contain the entire IP header from the original message, so the end system knows which packet failed. The ICMP header appears after the IPv4 or IPv6 packet header and is identified as IP protocol number 1.
ICMP is a protocol for sending various messages to report network conditions—it is not ping. The echo request is one of many messages. Ping can be filtered out, but the majority of ICMP message types are required for proper operation of IP, TCP and other protocols.
Internet Control Message Protocol (ICMP) is one of the protocols of the TCP/IP suite. The ICMP echo request and the ICMP echo reply messages are commonly known as ping messages.
An important troubleshooting tool within the ICMP protocol is the Packet Internet Groper (ping). The ping command is used to verify connectivity with another host on a network, employing a series of echo requests and echo reply messages to query the status of a node on a network.
the Ping command
The packet Internet groper (Ping) command sends an Internet Control Message Protocol (ICMP/ICMPv6) Echo Request to a host, gateway, or router with the expectation of receiving a reply.
The Ping tool is used to test whether a particular host is reachable across an IP network. A Ping measures the time it takes for packets to be sent from the local host to a destination computer and back. The Ping tool measures and records the round-trip time of the packet and any losses along the way.
|ping -v||ping -v||Verbose Output. Lists individual ICMP packets, as well as Echo Responses|
This post will discuss what we call "pings." A ping is, essentially, a notification—primarily for smartphones. When someone sends a "ping," particular get a popup on their phone (or desktop application), if they belong to the group pinged. All pings on discord start with the "@" symbol.
not safe for work
NSFW is an internet acronym that means "not safe for work." NSFW often serves as a content warning, urging the viewer to use discretion or avoid the post or image when they are in a professional or public setting.
This signal, which is measured in milliseconds (ms), lets you know how long it takes for a packet of data to travel from your computer to a server on the internet and back. That measurement is referred to as the latency between the computer and its server.
Does @here ping notify people who currently have ” idle ” status? A big NO. If a user has their status on “idle,” they won't get notified by a message that has been sent with @here ping. However, if you ping people with @everyone, and their status is “idle,” they will surely be pinged and get notified.
The @here ping allows administrators and moderators of a server to ping everyone that is currently online on the server (in a specific channel). Only online members that have the permission to see the channel where the @here ping has been done will be pinged & notified, though.
The difference between the two is that @everyone mentions even offline users while @here only mentions users who are online and aren't idle at the moment. @everyone will ping/mention everyone in the server who is online, offline, or idle. @here will ping users who are only online and not offline or idle.
Head to the Roles tab from the menu and click @eveyrone to manage the permissions for all server members. Scroll down to Text Channel Permissions and make sure to turn off the “Mention @everyone, @here, and All Roles” option. Click the Save Changes button at the bottom of your screen to confirm your decision.
Disable A Channel's @everyone
Jul 30, 2020
Rather than entirely disabling the mentions, you can suppress them, ie, you can choose to not get notified when someone sends a message with an '@everyone' or '@here' mention. You can use this option even if you are not the server admin.
The only possible ways for you to avoid getting pinged is to completely block whatever user is sending them (only effective if a specific few users are pinging roles and you don't mind not seeing their messages), or to leave the server.