This read-create value (0-10000) is the number of an IP access list restricting which source IP addresses may use this community name; a value of zero means any source IP is accepted for that community. An admin sets this to a specific access list number to lock a community name down to a known set of management station addresses, closing the trivial-authentication gap that community names alone leave open. For example, setting rsSnmpCommunityAccessList to a specific access list number restricts that community's SNMP access to only the IP addresses defined in that list, rather than accepting requests from any source claiming the correct community name.