I am working on a project to find and Implement a "firewall" or ? to reject packets being sent from the Internet to our LAN containing certain words or phrases. We presently have a SonicWALL Pro but it of course has no ability to filter Unsolicited in bound packets.
Seems like what I need is a Layer 7 device. Working in conjunction with the SonicWALL is desirable, but not essential. If this new device replaces the SonicWALL that is OK.
Based on what research I have done thus far, it seems that Cisco has a device that could do this but costs nearly $20K. The Foundry ServerIronXL also seems to be a viable option at about a third of that price. But, both of these boxes seem to be overkill. We don't need any load balancing or switching. Just rejection of packets with unwanted words or phrases.
Our environment is pretty simple. Less than half a dozen servers, a Cisco 2600 router with 2 T1s to an ISP, 50 workstations and the SonicWALL.
There has to be something out there that can meet our needs for a few thousand dollars.
Any thoughts, ideas or comments on the quest or the hardware I have found thus far will be appreciated.