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zoo:diagnosticsmac [2021/07/22]
127.0.0.1 external edit 		zoo:diagnosticsmac [2022/11/21]
joachim
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   - Type **Network Utility** to search.   - Type **Network Utility** to search.
   - Double-click **Network Utility** to run.   - Double-click **Network Utility** to run.
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 +>**Note:** With the release of macOS Big Sur, Apple chose to discontinue this application. However, you can still access many of its most useful features using **[[https://www.makeuseof.com/how-to-use-terminal-as-network-utility-replacement/|Terminal]]**.
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 =====Diagnostics===== =====Diagnostics=====
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 1. **Ping:** The ping diagnostics utility is the primary TCP/IP tool used to troubleshoot connectivity, reachability, and name resolution. Ping verifies IP-level connectivity to another TCP/IP computer by sending Internet Control Message Protocol (ICMP) Echo Request messages. Receipts of corresponding Echo Reply messages are displayed, along with round-trip times. 1. **Ping:** The ping diagnostics utility is the primary TCP/IP tool used to troubleshoot connectivity, reachability, and name resolution. Ping verifies IP-level connectivity to another TCP/IP computer by sending Internet Control Message Protocol (ICMP) Echo Request messages. Receipts of corresponding Echo Reply messages are displayed, along with round-trip times.
 {{:zoo:nu_ping.png?640|Ping}} {{:zoo:nu_ping.png?640|Ping}}
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->**Note:** The Windows firewall default settings block the ICMP echo requests used for ping command. To enable ICMP echo on Windows, go to Control Panel -> Windows Firewall -> Advanced settings -> Inbound Rules and enable File and Printer Sharing (Echo Request - ICMPv4-In) in the active security profile. 
  
 2. **Lookup:** The DNS Lookup diagnostic utility displays information that you can use to diagnose Domain Name System (DNS) infrastructure. 2. **Lookup:** The DNS Lookup diagnostic utility displays information that you can use to diagnose Domain Name System (DNS) infrastructure.
 {{:zoo:nu_lookup.png?640|Lookup}} {{:zoo:nu_lookup.png?640|Lookup}}
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 3.  **Traceroute:** The Trace Route diagnostic utility determines the route taken to a destination by sending Internet Control Message Protocol (ICMP) echo packets with varying IP Time-To-Live (TTL) values to the destination. Each router along the path is required to decrement the TTL on a packet by at least 1 before forwarding it, so the TTL is effectively a hop count. When the TTL on a packet reaches 0, the router should send an ICMP Time Exceeded message back to the source computer. 3.  **Traceroute:** The Trace Route diagnostic utility determines the route taken to a destination by sending Internet Control Message Protocol (ICMP) echo packets with varying IP Time-To-Live (TTL) values to the destination. Each router along the path is required to decrement the TTL on a packet by at least 1 before forwarding it, so the TTL is effectively a hop count. When the TTL on a packet reaches 0, the router should send an ICMP Time Exceeded message back to the source computer.
 {{:zoo:nu_traceroute.png?640|Traceroute}} {{:zoo:nu_traceroute.png?640|Traceroute}}
  
-4. **Port Scan:** The Port Scan test scans for open TCP ports. In the case of the Zoo, you will want to scane for for TCP Port 80.+4. **Port Scan:** The Port Scan test scans for open TCP ports. In the case of the Zoo, you will want to scan for TCP Port 80.
 {{:zoo:nu_portscan.png?640|Port Scan}} {{:zoo:nu_portscan.png?640|Port Scan}}
  
zoo/diagnosticsmac.txt ยท Last modified: 2023/11/28 by brian

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