ICMP Flashcards
(7 cards)
1
Q
What does ICMP?
A
Provides Feedback about issues related to the processing of IP Packets under certain conditions
2
Q
For what can ICMP be abused?
A
Recon, thus it’s blocked in some networks
3
Q
Commands which use ICMP
A
*Ping
*Traceroute (–> ping with special TTL)
4
Q
Why does sometimes the first ping request fail?
A
Cause it’s not in the ARP Table yet and the first request times out while the ip is resolved.
5
Q
Ping failed = Host not available?
A
No, ICMP can be blocked and thus ping fails
6
Q
ICMPv4 and ICMPv6 messages (not all)
A
*Host reachability (ICMP Echo Request)
*Destination or Service Unreachable
*Time exceeded (TTL)
7
Q
ICMPv6 Messages
A
*Router Solicitation (RS)
*Router Advertisement (RA)
*Neighbor Solicitation (NS) used for DAD
*Neighbor Advertisement (NA) –> ARP for IPv6
