<?xml version="1.0" encoding="utf-8"?> <icmptype> <short>Address Unreachable</short> <description>This error message is generated by a router, or by the IPv6 layer in the originating node, in response to a packet that cannot be delivered to its destination address for reasons other than congestion.</description> <destination ipv4="no"/> <destination ipv6="yes"/> </icmptype>