I have a VSAT connection in an office. The office is shared by Christian Aid and several others. I have an ASA 5505 connected to the VSAT equipment, and have created two VLANs on the ASA - one for my organisation, and one for everyone else.
I am using Cacti to collect traffic data using SNMP, and graphing the traffic on each VLAN: Internet, ChristianAid and OtherOrgs. I am trying to see which VLAN is making the most use of the Internet connection for management purposes. All traffic to the internet goes through the Internet VLAN.
Here are the graphs:
The graphs show inbound and outbound traffic on each VLAN. However, since traffic from one VLAN to another is outbound on one VLAN, and inbound on the other, the graphs are quite hard to read. Also, since all traffic, not just traffic to and from the internet is included, I don't think the graphs are telling me what I need to know.
The graphs above seem to indicate that the other organisations are using far more of the internet connection than Christian Aid. However, I am confused that the OtherOrgs chart shows all that outbound traffic, which correlates with the Inbound traffic on the Internet VLAN. But that could just mean that the OtherOrgs are sending a bunch of traffic to the Internet VLAN, rather than downloading. Perhaps the ASA is dropping most of this traffic.
Has anyone tried to use SNMP to see how much different VLANs are accessing a network resource? Am I heading in the right direction? Any suggestions gratefully recieved.