Parameter and Command Reference > Secure Socket Layer Parameters > SSLCheckCommonName 

Verifies the identity of the peer. Specifies whether the host name listed in the peer's certificate (that is, the CommonName or "CN" attribute) resolves to the same IP address as the peer itself, as determined by the network connection.
For example, if the host name in a certificate is and resolves to an IP address of, then the peer must share the same IP address.