| Rev | Author | # | Line |
|---|---|---|---|
| 1 | MattBrown | 1 | [ICMP] reason subcode 0x5, used with [ICMP] reason code 0x3 to explain why a DestinationUnreachable message was sent. |
| 2 | |||
| 3 | It is usally generated by a router when it cannot forward the packet because it is using source routing and the required route does not exist. |
