Application firewall to block SNMP write attempts

[watcher60 () hotmail com]

All,
  does anyone know of any application firewalls (or similar) that is able to block SNMP write connections. I've been 
asked to allow a monitoring server access from a differnet site to monitor devices in our secure network. As it only 
needs to use SNMP read not write the end goal is to block all but read access. I was wondering if there are any devices 
capable of querying and I presume blocking certain commuity strings.

thanks

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