The SNMP devices may be located in a private network.
We discussed with a cable vendor who quoted,
He talks about about deploy probes, proxing, on site agent.SNMP on modems is only accessible via the modem IP, which is traditionally a private IP within an MSO. Companies will generally deploy a probe or agent on-site that collects the SNMP data and delivers it back to their main operation.
SNMP proxies are also a possibility.
We want to know how those mechanisms are actually implemented in detail.
Some references or few lines of introduction about the set up would be really helpful.