With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
pppCHAPInResponses
ppp CHAP In Responses
1.3.6.1.4.1.2.6.119.4.2.5.1.5
Total number of CHAP responses received over the PPP interface.
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IPHost Network monitor allows you to monitor pppCHAPInResponses on IBM device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring IBM servers right now.