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For FAQs on Traps, Behavior, SNMPv3, Table Configuration refer SNMP Agent Simulator.
Is there a topology editor to create the connections between the devices easily?
I have started agents in the simulator, but I cannot ping them from my management station. Why?
1. In the Network Design Tool, if I set up a network with three virtual devices, does each need to have the same configuration?
Each device in the network can have its own configuration with unique IP address and port number.
2. How can I add devices to the existing network. I think the Network Design wizard adds devices only to the new network ?
If you click on the new network and choose the Network Design wizard all the devices will be created in a new network.
To add devices to an existing network, select Network -> Open and browse and select the .net file to open the network.
Click on the Tools --> Network Design wizard or Tools -> Random Device Addition Wizard and configure the devices to be added. You can also drag and drop devices from the device tree to the network area.
3. I created one Nework (network01) and added 10 Cisco Router SnmpNodes . I set virtual addresses (192.168.12.1 ~ 192.168.12.10) to SnmpNodes. The WebNMS discovers just one device. Could you check this problem?
During the discovery process, NMS will be querying the ipAddrTable to retrieve the IPAddress of the simulated agents. While adding SNMP devices to the network, the virtual IP address assigned to a device is automatically added to the ipaddrTable.
For Windows OS, the following step must be performed, in addition to changing the ipAddrTable.
Edit the "HOSTS" file on the Windows PC. It will exist in C:\WINNT\SYSTEM32\DRIVERS\ETC directory. Append the IP addresses to host names. Each entry should be kept on an individual line. The IP address should be placed in the first column followed by the corresponding host name. The host name can be the ip address. Any Other Name could also be given.
Format : <IP_Simulated> <HOST_NAME>
Example : 192.168.12.1 192.168.12.1
4. I have simulated an agent with Read community = 'public' and Write community = 'private'. When I opened my NMS application with community 'private', which is defined as Read/Write, the simulated agents were not discovered. When I opened my NMS application with community 'public', which is defined as Read Only, all agents were discovered successfully. In addition the 'Community' = 'private' in MIB Browser does not allow to Get the paramaters' values.
The Read community = "public" indicates that for any get/get-next request , the "community field" in the MibBrowser should be "public" . The Write Community = "private" indicates that for any set request the "community field" in the MibBrowser should be "private".
Similarly, in your NMS application, while doing a discovery the "community" that you have to specify is the Read community (here public). This is because, the discovery is nothing but a get/get-next operation on some node. Only while doing a Set from your NMS to the agents, the "community" that you have to specify is the Write Community (here private).
5. I have the real Agent with our own configuration, Is it possible to simulate this agent and start it as multiple instances ?
Yes, you can use the Record Real Agents feature to record the agent and create multiple instances of this agent using the Network Designer tool.
6. I am unable to access the virtual interfaces added in the server machine ( where simulator is running) from the Manager machine ( where the manager application is running ). What could be the problem?
If the simulator and manager application are running in separate machines, you have to use the route add command in the system where the manager application is running, to access the virtual interfaces. Refer to TroubleShooting Guide -> Network Simulator, for more information.
7. Is there a topology editor to create the connections between the devices easily?
Yes, the topology editor enables you to visualize interconnections between the devices in the network. You can connect new devices or disconnect existing devices in the topology. Refer to Topology Editor for more information.
8. Will the product work with multiple network cards?
The product does not support Multiple Network
card environment. As virtual IPs are created dynamically it is not possible
to
distribute the creation of IPs to multiple cards.
9. I cannot start agents in simulator. I get "Unable to start agent" error when starting an agent instance. Why?
The above error will occur in Network Simulator in any one of the following cases:
The port may be occupied by some other application. If you are unable to start the SNMP agents at port 161, refer to TroubleShooting Guide.
There is a IP clash in the network. (i.e) the virtual IP configured in the simulator already exists in the network. Please ensure that the virtual ip address specified is unique.
Product is installed in C:\Program Files . Actually this is a limitation of our product. Installation directory name should not have spaces.
10. I have started agents in the simulator, but I cannot ping them from my management station. Why?
If the simulator and the manager application is running in separate machines on the same network, the virtual ipaddress configured in the simulator ( machine where the simulation application is running ) will not be accessible from the Manager ( machine where the manager application is running ).
To access the simulated network, execute the route add command in the system where the manager application is running.
11. How do I add a MIB to an existing simulation?
You can add a MIB to the template devices in the device tree by using the SNMP -> Agent values right-click menu option. This will be reflected on all the template based devices in the network area. If a MIB is loaded to the template device when the agents are running, the agent will not return the newly added MIB values when the corresponding OIDs are queried. The network has to be restarted to register the OIDs.
You can also add a MIB to individual devices in the network area by using the SNMP -> Agent values right-click menu option or select Configure -> SNMP Agent Values. Select the "Load MIBs" option to load and simulate new MIBs.
Configuring Virtual IP Address
1. Is dynamic configuration of virtual IP supported ?
Yes, dynamic configuration of virtual ip is supported in Windows NT, 2000, XP, 2003 and Linux/Solaris OS. Refer to the topic, Configuring Virtual IP Address, for more information.
2. I would like to start out by using the Demo Network. I am running Windows 2000 with DHCP configured. So far I can't seem to figure out how to add the virtual IP's - this capability is grayed out, presumably because of DHCP. Is there a way around this?
In a system with DHCP configuration virtual IP Addresses cannot be configured. In the case of the DHCP enabled machines you can have only one IP Address for the machine. An arbitary IP Address is assigned to the machine when it boots up. Everytime the system is rebooted/restarted, a different IP Address is assigned to the system. For finding out the current IP Address of the machine, execute the command ipconfig in the command prompt. The work around for this is to simulate devices using different ports. For the DemoNetwork to work properly, change all the IP Addresses to the machine IP and provide different ports for the agents.
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