The value of tmnxOamPingCtlTgtAddress specifies the destination IP host
address to be used when performing an OAM ping operation. The
corresponding address type is configured using
tmnxOamPingCtlTgtAddrType.
For 'dnsPing' this is the address of the DNS server host that will be
asked to resolve a dns name specified by tmnxOamPingCtlDnsName.