User`s manual

 From RFC 1473 (PPP/IP MIB):
 PPP IP Group
 From RFC 1474 (PPP/Bridge MIB):
 PPP Bridge Group
 From RFC1573 (IfMIB):
 ifMIBObjects Group
 From RFC1695 (atmMIB):
 atmMIBObjects
 From RFC 1907 (SNMPv2):
 only snmpSetSerialNo OID
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