====== Telenegar Ping Check Tool ======

The **Telenegar Ping Check Tool** is a network connectivity diagnostic utility designed to measure reachability, round-trip packet latency, and packet loss from remote probe vantage points to any target IPv4/IPv6 address or domain hostname.

It supports both standard **ICMP Ping** protocol testing and **TCP Ping** testing (useful when ICMP echo requests are filtered by firewalls or when shell/raw-socket access is restricted on probe nodes).

----

===== Tool Features & Parameters =====

The Ping Check interface provides customized parameters to test reachability across different transport modes and probes:

^ Parameter ^ Description ^ Options / Examples ^
| **Target Host / IP** | The domain name, hostname, or IP address to test for reachability. | e.g., ''s231.mehost.co'', ''192.0.2.1'' |
| **PACKET COUNT** | The number of echo request packets sent during the check. | Options: ''4 packets'', ''8 packets'', ''10 packets'' |
| **TCP PORT** | The specific TCP service port used when performing a TCP Ping (e.g., HTTP/HTTPS, SSH). | Default: ''443'' (HTTPS), ''80'' (HTTP), ''22'' (SSH), ''25'' (SMTP) |
| **PROBE** | The geographical probe vantage point and protocol type executing the ping test. | Categorized into **ICMP Ping** and **TCP Ping (no shell access)** probes. |

==== Probe Types & Protocols ====

  * **ICMP Ping Probes:** Uses raw ICMP Echo Request/Reply packets (`ping`). Provides true network-layer latency and packet loss metrics.
    * *Example:* ''Tehran, Iran — Atrin Information & Communications Technology Company''
  * **TCP Ping Probes:** Uses TCP `SYN` handshakes to measure response times to a specific TCP port (`TCP Ping`). Used when probes lack raw socket/shell permissions or when targets block ICMP traffic.
    * *Example:* ''Falkenstein, Germany — Hetzner Online GmbH''

<note warning>
Probes operating in **TCP Ping** mode test whether a specific TCP port responds rather than sending raw ICMP echo requests. While useful for verifying port-level reachability, latency values reflect the TCP three-way handshake time rather than ICMP echo response time.
</note>

----

===== How to Perform a Ping Check =====

  # **Enter Target Host Name or IP:** Type the domain or IP into the input field (e.g., ''s231.mehost.co'').
  # **Select Packet Count:** Choose the number of probe packets to send from the **PACKET COUNT** dropdown menu (e.g., ''4 packets'').
  # **Set TCP Port (If Applicable):** If using a TCP Ping probe, specify the target TCP port in the **TCP PORT** field (e.g., ''443'' for web servers, ''25'' or ''587'' for mail servers).
  # **Select Probe Location & Protocol:** Open the **PROBE** dropdown menu and select an active probe under either **ICMP Ping** or **TCP Ping (no shell access)**.
  # **Execute Test:** Click the blue **Ping** button to initiate packet transmission and view min/avg/max latency (ms) and packet loss percentage.

----

===== Key Use Cases & Diagnostics =====

==== 1. Reachability & Packet Loss Detection ====
Determine whether a host or server is online and responding from domestic or international vantage points. A 100% packet loss indicates an offline host, network outage, or strict firewall blocking.

==== 2. Firewall & ICMP Filter Troubleshooting ====
If a server fails an **ICMP Ping** but passes a **TCP Ping** on port `443` or `80`, the host is online and functioning, but its edge firewall is dropping ICMP echo requests.

==== 3. Mail & Web Service Connectivity Verification ====
Test TCP reachability on service-specific ports to verify edge firewalls are open:
  * Port `443` / `80` — Web server reachability (audit further with [[tools:sitecheck|Telenegar Site Check Tool]]).
  * Port `25` / `587` / `993` — Mail server reachability (audit further with [[tools:mailcheck|Telenegar Mail Check Tool]]).

==== 4. Latency Analysis (Domestic vs. International) ====
Compare round-trip times (RTT) across European and Iranian probes to evaluate route latency, BGP routing paths, and network degradation.

----

===== Related Documentation & Tools =====

  * [[tools:sitecheck|Telenegar Site Check Tool]] — Test website HTTP/HTTPS availability, redirects, and SSL certificates.
  * [[tools:dnscheck|Telenegar DNS Check Tool]] — Query DNS record resolution, propagation, and DNSSEC validation.
  * [[tools:mailcheck|Telenegar Mail Check Tool]] — Diagnostic tool for email security, SPF, DKIM, and DMARC checks.
  * [[security:best-practices|Cybersecurity Best Practices]] — Infrastructure hardening and firewall rule guidelines.
  * [[email:troubleshooting:reverse-dns|Reverse DNS (PTR)]] — Match server IP addresses to hostnames.