For the questions up above. 1) To test the MTU of your own system and to reproduce this behaviour from a host, the ping command has an option to set the payload. Based on OS the payload may include the ICMP header or exclusively the ICMP payload. By setting the DF bit on the ping command you can sweep through packet sizes to see the MTU that gets through (use a capture tool to remove any doubt as to what is going on the line). 2) To produce this behaviour in GNS3, on a particular link set each endpoints interface MTU via a command. The quickest way to do this would be between a link that has a router on each end. Hop on the respective interfaces and set the MTU to 1200. Then ping from host to host that is forced to cross that particular link in the network path. The commands to run on routers, or your host are VERY easily found on an internet search.
guys i ping a random site and it apears only ICMP protocols.There are no IPv4's and no fragments.How can i see those fragments and get to appear on my screen IPV4 protocols like those in the video
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For the questions up above.
1) To test the MTU of your own system and to reproduce this behaviour from a host, the ping command has an option to set the payload. Based on OS the payload may include the ICMP header or exclusively the ICMP payload.
By setting the DF bit on the ping command you can sweep through packet sizes to see the MTU that gets through (use a capture tool to remove any doubt as to what is going on the line).
2) To produce this behaviour in GNS3, on a particular link set each endpoints interface MTU via a command. The quickest way to do this would be between a link that has a router on each end. Hop on the respective interfaces and set the MTU to 1200. Then ping from host to host that is forced to cross that particular link in the network path.
The commands to run on routers, or your host are VERY easily found on an internet search.
It is 1480 bytes. Not bits. The offset counts 8-byte blocks
guys i ping a random site and it apears only ICMP protocols.There are no IPv4's and no fragments.How can i see those fragments and get to appear on my screen IPV4 protocols like those in the video
Make a lab how we get these fragments via gns3 lab
But how did you get packets fragmented? can I do that via command line manually?
yes, you have just to send more than the maximum mtu. For example: ping-s 1473 YOUR.DESTINATION.IP (for Ipv4) (1473 + 8 + 20 > 1500 MTU)
You can write a simple C code or python scapy for that purpose