Limit SNMP access to VPN

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http://serverfault.com – I need to deploy about a thousand machines across the US later this year. I'm hoping to use SNMP to monitor their (collective and individual) status. The whole block will be connected via OpenVPN so I'm hoping that there is a way to limit SNMP access to this network. The only setting I've discovered so far is to use: rocommunity <community name> where 10.20.xx.xx is the VPN. I don't have any other users or communities defined. Will this be sufficient? (HowTos)