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Network Diagnostics for server connectivity issues

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  1. 1

    Broad Network Check for server connectivity issues

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    • Objective: Determine if the issue is isolated to the server or affects the wider network.
    • Action: Ping another server within the same network.
    • Outcome:
    1. False: Issue is not overall network side but its with that host/server
    2. True: Might be overall network side issue


    ping <ip_within_the_same_network>
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    1
  2. 2

    Server-Side Checks for server connectivity issues

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    • Objective: Assess server's network configuration and operational status.
    • Actions:
    1. Virtual Console Check
    2. Network Interface and IP Configuration


    2
    1. 2.1

      Virtual Console Check

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      Log into the server via virtual console. Check if the server is powered on and operational by verifying its uptime.

      uptime
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      2.1
    2. 2.2

      Network Interface and IP Configuration for server connectivity issues

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      2.2
      1. 2.2.1

        Verify network interface status for server connectivity issues

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        ip addr show
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        2.2.1
      2. 2.2.2

        (Optional) Review IP configuration in /etc/sysconfig/network-scripts/ifcfg-<interface>

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        cat /etc/sysconfig/network-scripts/ifcfg-<interface>
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        2.2.2
  3. 3

    Connectivity Checks for server connectivity issues

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    3
    1. 3.1

      Ping the Gateway for server connectivity issues

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      ping -c 4 <gateway_IP>
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      3.1
    2. 3.2

      Check Routes for server connectivity issues

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      ip route show
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      3.2
  4. 4

    Security Configuration for server connectivity issues

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    4
    1. 4.1

      Check SELinux Status for server connectivity issues

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      Action: Ensure SELinux is not blocking access to the service/server.

      getenforce
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      4.1
    2. 4.2

      Review Firewall Rules for server connectivity issues

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      Command:

      • sudo iptables -L (for iptables)
      • sudo firewall-cmd --list-all (for firewalld)
      sudo iptables -L sudo firewall-cmd --list-all
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      4.2
  5. 5

    Physical Connection

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    • Objective: Ensure there's no physical disruption to the network connection.
    • Action: Perform a physical inspection of network cables and hardware. Verify the link lights on the network interface card (NIC).


    5