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RFC 1812 provides an explanation.
1 = Host Unreachable - generated by a router if a forwarding path (route) to the destination host on a directly connected network is not available (does not respond to ARP);
RFC 1812 provides an explanation.
1 = Host Unreachable - generated by a router if a forwarding path (route) to the destination host on a directly connected network is not available (does not respond to ARP);