What is source default value in SNMP : Agent : Access (v1, v2c) ?

I had to do some tests with this, and I want to add more information if someone else needs.

Let's call the following as global list:

System > SNMP > Agent > Configuration > SNMP Access > Client Allow List

Let's call the following as community list:

System > SNMP > Agent > Access (v1, v2c) > (select a community string) > source

The global list applies to snmpd process, while the community list applies to that specific community.

The community list does not overwrite the global list.

If you want to have remote SNMP access, you need to add the network/IP to both global and community lists.

Adding just to one of them will not work.

In the community list, you can specify default, and that will use the global list.

You can also select all in the source for the community list.

Selecting all or specifying default will have the same effect, as only what is allowed in the global list will work.