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For each router, the following steps occur:
1) The "access-group in" command is checked on the interface, and discards the packet if the rule tells it to do so.
2) The "TTL" field is decreased by 1.
3) If TTL is now 0, the router discards the packet and sends a reply packet back to the sender.
4) The packet's IP address is compared to the routing table to determine the next hop of the packet.
5) The router advises if the network or host is unreachable due to a down interface or no known route.
6) The router sends the packet to the outgoing interface's queue to be sent to the next hop.
7) The "access-group out" command is checked on the interface, and discards the packet if the rule tells it to do so.
8) The router sends the packet to the next hop.
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Why is it that an ICMP packet does not have source and destination port?
Because ICMP is on the network layer
What is the size of the smallest icmp packet?
64 Bytes.
What packet is used in ping command?
Packet Internet Groper(PING) is an Internet Control Message Protocol(ICMP) request packet for it's working. ICMP packets are used to check networks are live or not. -- By MYNarutoAnime ----
What is the maximum size of an IP packet carrying an ICMP packet?
The maximum for any IP packet via ethernet is limited to a maximum of 1508 characters. ICMP packets are typically small but can be configured to use any amount of characters up to the maximum size of a packet.
What is the minimum maximum size of ICMP packet?
Minimum size is 36
What protocol allows hosts to exchange messages to indicate problems with packet delivery?
ICMP The Internet Message Protocol (ICMP) allows hosts to exchange messages to indicate the status of a packet as it travels through the network.
Which protocol allows host to exchange messages to indicate problems with packet delivery?
ICMP
What does the ascii payload section of an icmp packet in linux contain?
A string of characters followed by 0-9
What are the main functions of icmp?
Internet Control Message Protocol (ICMP), documented in RFC 792, is a required protocol tightly integrated with IP. ICMP messages, delivered in IP packets, are used for out-of-band messages related to network operation or mis-operation. Of course, since ICMP uses IP, ICMP packet delivery is unreliable, so hosts can't count on receiving ICMP packets for any network problem. Some of ICMP's functions are to: * Announce network errors, such as a host or entire portion of the network being unreachable, due to some type of failure. A TCP or UDP packet directed at a port number with no receiver attached is also reported via ICMP. * Announce network congestion. When a router begins buffering too many packets, due to an inability to transmit them as fast as they are being received, it will generate ICMP Source Quenchmessages. Directed at the sender, these messages should cause the rate of packet transmission to be slowed. Of course, generating too many Source Quench messages would cause even more network congestion, so they are used sparingly. * Assist Troubleshooting. ICMP supports an Echo function, which just sends a packet on a round--trip between two hosts. Ping, a common network management tool, is based on this feature. Ping will transmit a series of packets, measuring average round--trip times and computing loss percentages. * Announce Timeouts. If an IP packet's TTL field drops to zero, the router discarding the packet will often generate an ICMP packet announcing this fact. TraceRoute is a tool which maps network routes by sending packets with small TTL values and watching the ICMP timeout announcements.By far the most common use of icmp is ping.
What will happen if a router received a ICMP packet with TTL 0?
1.The router will discard the packet. 2.The router will send a time exceeded message to the source host.
What transport layer protocol does ping use?
Assuming IPv4 ICMP. Ping uses IP for transport. Ping in itself is an "Echo Request", which is a function of the ICMP protocol. The IP Packet will carry the ICMP protocol from end-to-end. ICMP has a protocol number of 1, so the "Protocol" field in the IPv4 header will contain "1" as a reference to the ICMP payload. For IPv6, ICMPv6 is used, and the transport will be IPv6.
What is the purpose of including the IP header and the first 8 bytes of datagram data in the error reporting ICMP message?
To match the packet to the process that sent it.
