2.1.8 c-ip

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When a client creates a logging message, it SHOULD specify the c-ip field as "-" but MAY specify the IP address of the client.

If a proxy is forwarding a logging message on behalf of a client, the c-ip field MUST specify the IP address of the client. The proxy MUST replace the value of the c-ip field that was specified by the client with the IP address of the client (as known to the proxy).

The syntax of the c-ip field is defined as follows.

 c-ip =  "-" | ip_addr

Example:

  
 157.100.100.100

Example:

  
 3ffe:2900:d005:f28b:0000:5efe:157.55.145.142