packetlevel.ch

analysis of icmp

Analysing ICMP traffic ist important, because you can see, what is going wrong in the network:
Examples:
- fragmentation Problems
- network or port unreachable
- routing redirects

Sniffed icmp packets

Sample 1:Port Unreachable

Text

Sample 2:Host Unreachable

Text

Sample 3:Net Unreachable

Text

Sample 4:Fragmentaion

Text

Usefull ICMP References

www.iana.org/assignments/icmp-parameters

Usefull ICMP Filters

icmp and not (icmp[0]=0x08 or icmp[0]=0x00)

sniff all icmp , but not icmp request and replay

Usefull ICMP Scripts

icmppacket.sh is a shell script with HPING , for generating all type of ICMP Packets.

root@bitmonsterli # ./icmppacket.sh
	
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
 -  icmppacket.sh  packet creation enviroment          -
 -  christoph Weber                                    -
 -  (c) packetlevel.ch                                 -
 -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

   Usage : ./icmppacket.sh   [nb] [ttl]

icmppacket.sh