Differences between version 5 and predecessor to the previous major change of DestinationHostUnreachable.
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| Newer page: | version 5 | Last edited on Thursday, April 12, 2007 3:08:44 pm | by BenStaz | Revert |
| Older page: | version 4 | Last edited on Tuesday, June 1, 2004 11:54:04 pm | by MattBrown | Revert |
@@ -1,3 +1,5 @@
[ICMP] reason subcode 0x1, used with [ICMP] reason code 0x3 to explain why a DestinationUnreachable message was sent.
+
+If a packet is to be forwarded to a host on a network that is directly connected to the router (i.e., the router is the last-hop router) and the router has ascertained that there is no path to the destination host then the router MUST generate a Destination Unreachable, Code 1 (Host Unreachable) ICMP message.
It is usally generated by a gateway when it does not have a route for the destination specified in the IP packet that caused the error. Often this reason is used when a router cannot contact the next hop router specified in it's routing table (ie. The next hop router is not responding to [ARP] requests).
