Jul 07, 2003

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. Solved: Prohibited Unreachable ICMP Failing - Cisco Community Information and symptoms: IOS code 12.2.33SHX3 Pings intermittently failing No ACLs anywhere in the path. Errors from debugs: Feb 1 23:34:02.562 cst: ICMP: dst (165.68.17.3) prohibited unreachable rcv from 165.68.17.104 Feb 2 12:16:30.371 cst: FIBipv4-packet-proc: route packet from (local) src 16 7 Linux Route Command Examples (How to Add Route in Linux) The destination address ( 74.125.236.34 ) is not within the network range. So, in Layer-3 (IP header) the DESTINATION IP will be set as “74.125.236.34”. In Layer-2, the DESTINATION MAC address will be the filled in as the MAC address of the default gateway ( 192.168.1.10’s MAC ). The MAC will be found by using ARP as described earlier.

cisco - Change Ping Response for Traffic Blocked by Access

Solved: Prohibited Unreachable ICMP Failing - Cisco Community Information and symptoms: IOS code 12.2.33SHX3 Pings intermittently failing No ACLs anywhere in the path. Errors from debugs: Feb 1 23:34:02.562 cst: ICMP: dst (165.68.17.3) prohibited unreachable rcv from 165.68.17.104 Feb 2 12:16:30.371 cst: FIBipv4-packet-proc: route packet from (local) src 16 7 Linux Route Command Examples (How to Add Route in Linux) The destination address ( 74.125.236.34 ) is not within the network range. So, in Layer-3 (IP header) the DESTINATION IP will be set as “74.125.236.34”. In Layer-2, the DESTINATION MAC address will be the filled in as the MAC address of the default gateway ( 192.168.1.10’s MAC ). The MAC will be found by using ARP as described earlier.

NSX-T Evaluation Guide | VMware

Type Name Reference ---- ----- ----- 0 Echo Reply [RFC792] Codes 0 No Code 1 Unassigned [JBP] 2 Unassigned [JBP] 3 Destination Unreachable [RFC792] Codes 0 Net Unreachable 1 Host Unreachable 2 Protocol Unreachable 3 Port Unreachable 4 Fragmentation Needed and Don't Fragment was Set 5 Source Route Failed 6 Destination Network Unknown 7 Network Connection Destination Host Unreachable - Red Hat