How does snmpwalk work?

Hi,

can somebody describe me how snmpwalk work? Does it run the getnext request
all the time? Is that it? And how does it finish? I suppose getnext will
return the next object even if it is in another subtree than in the one
which was requested. In other words, let's say I request for an OID which is
the last one in some subtree.   Getnext will return an next OID no matter
it's in a different subtree. Am I right here?
But snmpwalk stops itself when it has got all the data in the specified
subtree. For example, snmpwalk  -v 1 -c public computer.com system will
print just OIDs in the system subtree.

I want to implement my own mib using just a simple program and pass_persist
directive. I don't exactly know how to implement getnext comand. What should
the program return when the last OID in my mib is requested by getnext ?

Thanks

Roman

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