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Have you considered SolarWinds Server & Application Monitor? The latest version, currently in beta adds an optional agent that negates the need for VPN tunnels. It supports overlapping IP address space, NAT traversal, passing through authenticated proxy servers, and communications are fully encrypted. These agents report back to a single, centralized server at your location, or in the cloud, such as Amazon EC2, Azure, RackSpace, etc.. More information can be found at the following links. https://thwack.solarwinds.com/... https://thwack.solarwinds.com/... https://thwack.solarwinds.com/... If that doesn't fit the bill, you should consider taking a look at N-able, which is a purpose built solution designed specifically with MSP's in mind. More information on N-able can be found at the following link. http://www.n-able.com/

Have you considered SolarWinds Server & Application Monitor? The latest version, currently in beta adds an optional agent that negates the need for VPN tunnels. It supports overlapping IP address space, NAT traversal, passing through authenticated proxy servers, and communications are fully encrypted. These agents report back to a single, centralized server at your location, or in the cloud, such as Amazon EC2, Azure, RackSpace, etc.. More information can be found at the following links. https://thwack.solarwinds.com/... https://thwack.solarwinds.com/... https://thwack.solarwinds.com/... If that doesn't fit the bill, you should consider taking a look at N-able, which is a purpose built solution designed specifically with MSP's in mind. More information on N-able can be found at the following link. http://www.n-able.com/

Have you considered SolarWinds Server & Application Monitor? The latest version, currently in beta adds an optional agent that negates the need for VPN tunnels. It supports overlapping IP address space, NAT traversal, passing through authenticated proxy servers, and communications are fully encrypted. These agents report back to a single, centralized server at your location, or in the cloud, such as Amazon EC2, Azure, RackSpace, etc.. More information can be found at the following links. https://thwack.solarwinds.com/... https://thwack.solarwinds.com/... https://thwack.solarwinds.com/... If that doesn't fit the bill, you should consider taking a look at N-able, which is a purpose built solution designed specifically with MSP's in mind. More information on N-able can be found at the following link. http://www.n-able.com/

Last time I had to map a network I used a tool from http://www.solarwinds.com/products/toolsets/discovery-tools.aspx. It worked really well, I decided later to write my own tool using nmap and C. Now I can't give out the actual program because the company who I worked for owns it, but if you have a weekend it's a great quick way to write a tool that can discover networks.

LANsurveyor express. It works with Visio 2007

Well, it's a windows app and it's not open source... BUT!

It's free as in beer and damned easy to setup/use: http://www.solarwinds.com/products/freetools/free_TFTP_server.aspx

I would have to agree with the other poster that suggested SolarWinds Orion network monitor. You can monitor network swithes, each port, servers, apps on the server, other devices with SNMP strings, things that don't support that.... you can import multiple maps etc. At our site in Orion we have a US Map, state map, then campus maps for a few sites. then building maps then to server room. Custom views and alters. My login to orion shows different stuff then our telecom person's login. and no i don't work for them http://www.solarwinds.com/

I was recently in a similar situation and I was the one who had to figure it all out due to lack of documentation. The main things that I did were to map the network and create updated diagrams. I did this by using a bunch of utilities both commercial and open source.

Create a list of UIDs and PWDs and maintain them in a program like PasswordSafe. http://passwordsafe.sourceforge.net/

Map all the switches using a program like netdisco. Depending on your equipment, it can find the uplinks and map the network for you. Otherwise, fill in the neighbor information on your own. http://netdisco.org/

Setup monitoring with Nagios and set the parent/child relationships using nagios. Make sure the map is accurate. Monitor all critical network services such as routers, dns, wins, email, proxy, fw, etc. http://www.nagios.org/

If you're not going to graph service data with Nagios, do it with Cacti. That will provide historical/trending data that is important for future network related decisions. http://www.cacti.net/

Create high level network overviews using Visio. Solarwinds LANsurveyor Express is very useful for automating network maps. http://www.solarwinds.com/products/LANsurveyorExpress/

Make sure you have good backup configs of all devices. A tool like Kiwi CatTools will automatically backup the configs for your devices and even alert you to when configs have been changed. It's great for change management purposes. http://www.kiwisyslog.com/kiwi-cattools-overview/