What SNMP Is Really Doing

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What SNMP Is Really Doing

The following example tracks a sample of SNMP traffic between a manager and an agent. Remember in real life you will use management software (such as HP’s Openview, which allows you to see the MIBs and query without knowing all the numbers).

The SNMP management system makes a request of an agent using the agent’s IP address or host name.

a.	Request sent by the application to UDP port 161.
b.	Host name resolved to an IP address, if host name was used, using host name resolution methods: localhost, HOSTS file, DNS, WINS, broadcast, LMHOSTS file.

SNMP packet gets set up with the listed information inside, and routes the packet on the agent’s UDP port 161:

a.	The command for the objects: get, get-next, set.
b.	The community name and any other specified data.

An SNMP agent gets the packet and puts it into its buffer.

a.	The community name is checked for validity. If it is not correct or is corrupted, the packet is rejected.
b.	If the community name checks out, the agent checks to see whether the originating host name or IP address is correct as well. If not, it is thrown out.
c.	The inquiry is then passed to the correct DLL as described in the preceding section on MIBs.
d.	The object identifier gets mapped to the specific API and that call gets made.
e.	The DLL sends the data to the agent.

The SNMP packet is given to the SNMP manager with the requested information.

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