What is ICMP (Internet Control Message Protocol)?

ICMP, or Internet Control Message Protocol, is an error-reporting protocol used by routers, hosts, and other network devices to communicate error information or updates to other routers, hosts, and network devices. Watch this video to learn more about ICMP.

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[saaransh]

What a simple, happy and crisp explaination Sir...
thank you :)

[smailsafire]

Thanks, you made me understand that shit easy. My teacher over explained it but u fixed it :)

[jeremyperreau]

wow, teacher over explained it too, now problem solved, thank you !

[othmanchekabab]

thank you for the video, You did explain ICMP better than my teacher

[manahealkamran]

how beautifully and concisely you explained.. Thank you

[xjkxwqr]

I never block ICMP because I'm 9 years old and I've just learned the concept.

[XlrSparkle]

Answer to question:
Whenever we initialize a connection with the server, if the target port is filtered then we will get an ICMP unreachable packet/flag or message from the target port..
PS:correct me if iam wrong somewhere. :)

[primalmachine]

wait, the network gateway will send an ICMP message to let me know of a shorter route? isnt it related to OSP or BGP?

[chorkano]

sorry im a little confused is it like udp or tcp ? and does it use ports?

[workgrinit]

3 page topic Understood in 2 mins, G E N I U S

[AbdullahALQahtani]

Can the ICMP Messages be discovered when it's sent from an untrusted source?

[griffn]

What do I do when it says icmp filtered?

[simonkaran]

Why do you pronounce traceroute like ''trays-root''? It sounds like you are american (just for curiosity).