Unit 4 Assignment
IT283 Networking with TCP/IP
Part I
| Message Type | Type Number | Description |
| Destination Unreachable | 3 | Response to an IP message being returned as undeliverable. Reasons are varied. |
| Time Exceeded | 11 | Response from a router which indicates that the packet was dropped because it reached its hop limit. |
| Parameter Problem | 12 | Response when a device detects that an incoming IP packet is corrupted or missing data. |
| Message Type | Type Number | Description |
| Destination Unreachable | 1 | Similar to ICMPv4. The packet cannot be delivered to the destination. |
| Packet too big | 2 | Message returned by a router when a packet cannot be forwarded because it has exceeded the packet size limits. |
| Time Exceeded | 3 | Similar to ICMPv4. Message is sent from the router where the delimiter would be dropped to 0 saying the packet has been dropped, or the reassembly timer has reached 0. |
| Parameter Problem | 4 | Similar to ICMPv4. Generic message triggered by a problem with the packet being sent. This message carries a pointer to where the problem occurred. |
| Echo Request | 128 | Message sent with ping to see if a target device is online and responding. |
| Echo Reply | 129 | Message sent in response to a ping request indicating its online status. |
| Router Solicitation | 133 | Message sent by a host to a router on power-on seeking its location and how to access it. |
| Router Advertisement | 134 | Message reply and occasionally resent from routers to hosts indicating where it can be found and how to access it. |
| Redirect Message | 137 | Considered an error in ICMPv4. “Used on networks with more than one local router” (Carrell, 2012). Used to indicate that traffic should be forwarded to a different router. |
| Router Renumbering | 138 | Used by network administrators to change the addressing prefixes of routers on a network. A command message is sent with the renumbering information for migration or integration purposes. |
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