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angelampcostadaisyfaithauma
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Updates protocol support (#22234)
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src/content/docs/load-balancing/monitors/index.mdx

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@@ -82,6 +82,6 @@ The following table summarizes the different types of monitors available in Clou
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| ------------ | -------------- | ----------- | -------------------- | -------------- |
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| HTTP/HTTPS | Public and private | Used for HTTP and HTTPS endpoints with specific protocol attributes. | The probe is configured with settings and success criteria such as Method, Simulate Zone, Follow Redirects, Request Headers, and Response Body. The probe then evaluates the configured success criteria using the HTTP protocol. Throughout the configured timeout period, the TCP connection is kept active using [keep-alives](/fundamentals/reference/tcp-connections/#tcp-connections-and-keep-alives), even if no response is received. | Success is based on meeting the configured HTTP success criteria. No response within the configured timeout and retries is considered unhealthy. |
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| TCP | Public and private | Checks TCP connectivity by attempting to open a connection to the endpoint. | The monitor sends a TCP SYN message to the specified port. A successful health check requires receiving a SYN/ACK message to establish the connection. The connection is closed by sending a FIN or RST packet, or by receiving a FIN packet from the endpoint. | Failure to establish a TCP connection within the configured timeout and retries is considered unhealthy. |
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| ICMP Ping | Public | Confirms basic Layer 3 (L3) connectivity to the endpoint using ICMP. The endpoints need to be allowed to reply to ICMP packets and any intervening networking equipment must support ICMP. | The monitor sends an ICMP/ICMPv6 echo request (ping) and expects an ICMP/ICMPv6 echo reply from the endpoint. | The endpoint must reply to the ICMP ping within the configured timeout and retries to be considered healthy. |
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| UDP-ICMP | Public | UDP-ICMP monitor works by sending a UDP probe packet after ICMP Ping monitor completes as healthy. | After receiving a successful ICMP reply, the monitor sends a UDP probe packet to the endpoint. If no ICMP Port Unreachable message is received, the endpoint is considered healthy. | If the monitor receives an ICMP Port Unreachable message within the configured timeout and retries, the endpoint is considered unhealthy. |
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| ICMP Ping | Public and private | Confirms basic Layer 3 (L3) connectivity to the endpoint using ICMP. The endpoints need to be allowed to reply to ICMP packets and any intervening networking equipment must support ICMP. | The monitor sends an ICMP/ICMPv6 echo request (ping) and expects an ICMP/ICMPv6 echo reply from the endpoint. | The endpoint must reply to the ICMP ping within the configured timeout and retries to be considered healthy. |
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| UDP-ICMP | Public and private | UDP-ICMP monitor works by sending a UDP probe packet after ICMP Ping monitor completes as healthy. | After receiving a successful ICMP reply, the monitor sends a UDP probe packet to the endpoint. If no ICMP Port Unreachable message is received, the endpoint is considered healthy. | If the monitor receives an ICMP Port Unreachable message within the configured timeout and retries, the endpoint is considered unhealthy. |
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| SMTP | Public | Verifies SMTP availability at the application layer. | The monitor establishes a TCP connection and sends an SMTP HELO command. It expects a reply with code 250. The monitor then sends an SMTP QUIT command, expecting a reply with code 221. At the end of each interval, the TCP connection is closed by sending a TCP FIN packet. | The endpoint must respond with correct SMTP codes (250 for HELO, 221 for QUIT) within the configured timeout and retries to be considered healthy. |

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