Fortinet FortiGate Series Administration Manual page 194

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Configuring interfaces

Figure 80: Interface status detection settings

Detect Server

The IP address of the server to test connecting to.

Use standard ICMP ping to confirm that the server is responding. Ping confirms

that the server can respond to an ICMP ping request.

Use TCP echo to confirm that the server is responding. Select this option if the

server is configured to provide TCP echo services. In some cases a server may be

configured to reply to TCP echo requests but not to reply to ICMP pings.

TCP echo uses TCP packets on port number 7 to send a text string to the server

and expect an echo reply back from the server. The echo reply just echos back the

same text to confirm that the server can respond to TCP requests.

FortiGate units do not recognize RST (reset) packets from TCP Echo servers as

normal TCP echo replies. If the FortiGate receives an RST response to a TCP

echo request, the FortiGate unit assumes the server is unreachable.

Detect Interface Status

FortiGate Version 4.0 MR1 Administration Guide

01-410-89802-20090903

http://docs.fortinet.com/

System Network