Contents
Is ICMP IPv4 or IPv6?
ICMP in IPv6 functions the same as ICMP in IPv4. ICMP for IPv6 generates error messages, such as ICMP destination unreachable messages, and informational messages, such as ICMP echo request and reply messages.
What is the role of ICMP in IPv4 datagram?
IPv4 and IPv6 ICMP provides feedback about hosts and networks to the sender of an IP packet. The routers and switches along the network path are not notified about the errors. An example of ICMP error reporting includes ‘host/network not found’ when the destination endpoint can’t be reached.
Does IPv6 need ICMP?
ICMP version 6, as an integral part of IPv6, provides a single comprehensive solution for the different network functions, which are usually performed by many different protocols in IPv4 like ARP, IGMP, ICMPv4 Router Discovery, ICMPv4 Redirect, etc. IPv6 is a connectionless and unreliable in its nature.
What are the ICMP messages common to both ICMPv4 and ICMPv6?
The ICMP messages common to both ICMPv4 and ICMPv6 include: host confirmation, destination (net, host, protocol, port) or service unreachable, time exceeded, and route redirection.
What is the purpose of ICMP messages?
Explanation:The purpose of ICMP messages is to provide feedback about issues that are related to the processing of IP packets.
What are two ICMPv6 messages that are?
The two ICMPv6 messages used in SLAAC are the router solicitation and the router advertisement.
What is the main function of ICMP?
Internet Control Message Protocol (ICMP) is used for reporting errors and performing network diagnostics. In the error reporting process, ICMP sends messages from the receiver to the sender when data does not come though as it should.
Is the ICMP for IPv6 the same as IPv4?
ICMP in IPv6 functions the same as ICMP in IPv4. ICMP for IPv6 generates error messages, such as ICMP destination unreachable messages, and informational messages, such as ICMP echo request and reply messages. Your software release may not support all the features documented in this module.
How are ICMP packets used in IPv6 discovery?
ICMP generates error messages, such as ICMP destination unreachable messages, and informational messages, such as ICMP echo request and reply messages. Additionally, ICMP packets in IPv6 are used in the IPv6 neighbor discovery process, path MTU discovery, and the Multicast Listener Discovery (MLD) protocol for IPv6.
What happens when an ICMPv6 error message is sent?
If this is not possible, the error message is silently dropped after any IPv6-layer processing. There are special rules for handling errors (see Section 8.3). An IPv6 node must limit the rate of ICMPv6 error messages it sends.
When to change IPv4 header checksum in ICMP?
In contrast, the IPv4 header checksum discussed in Chapter 5 is changed at every router hop. If an ICMP implementation receives an ICMP message with a bad checksum, the message is discarded; there is no ICMP message to indicate a bad checksum in a received ICMP message.