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3.1.5.5 Echo-Request Message

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This control message is sent by either peer of a PAC/PNS control connection to inform the other peer that this peer is alive as specified in [RFC2637] section 3.1.4. The PAC/PNS SHOULD send this message whenever the Echo Timer (section 3.1.2) expires. The format of this message is specified in [RFC2637] section 2.5.