![]() ![]() There is only one thing to be careful of. ![]() Then you have a simple CLI interface to the “virtual PC’s” where you can run Pings and Traceroutes. Really it takes all of 10 seconds to get it up and running. These can then be easily added to GNS3 topologies by adding a cloud (see later in the post for how to make them look pretty), and configuring a NIO_UDP port. However it is simple to configure it to create up to 9 separate simulated PC’s with either static or DHCP assigned addresses. this will by default create 3 PC’s with various IP addresses. Simple unpack the zip file to a folder and then run the VPCS.exe file. However the other day I came across VPCS! There is actuly a down load for this at the bottom of the GNS3 site ( here), and it is so simple and easy to get up and running that I suggest any one who uses GNS3 has a look. But loopbacks don’t really show well when looking at the topology on screen, and adding a whole router (or creating a Qemu host) seems to be a bit much when all you need is a device that can reply to and send pings and/or run trace routes. Ok you can set up loopback interfaces, or add in an extra router and just configure one interface with an IP to act an an end device. Do you put version numbers in MS Word Documents? You should.One of my main issues with GNS3 for studying that there are no end devices (PC’s) by default.Your first big mistake with Intersight.If you see any output from either of these commands, you should be able to trace back to the program that is using these ports using the netstat -b command (Windows and OS X anyway) Linux netstat -an | grep udp | grep 20000 netstat -an | grep udp | grep 30000 OS X: netstat -anp UDP | grep 20000 netstat -anp UDP | grep 30000 Windows: netstat -ap UDP | find "20000" netstat -ap UDP | find "30000" You can check for this using the netstat command on your host operating system (after closing vpcs of course) You have another application already using UDP port 20000 or 30000.You have a firewall blocking UDP port 20000 and/or 30000.If you can’t get ping replies, then your host PC is doing something to stop this. Step 4: Give the 2nd Virtual PC an IP and testĪll you need to do now is give VPC#2 an IP address on the same subnet as VPC#1 and they should be able to ping each other, as shown below: VPCS> ip 1.1.1.2 Note how the port numbers for VPC#2 are the reverse of VPC#1. ![]() What you will need to do is set up VPC#2 to have the reverse of these values, so change focus to VPC#2, and issue the set lport and set rport commands, as shown below: VPCS> 2 Now issue the show ipcommand and note the LPORT and RHOST:PORT values. When VPCS has opened, give the first VPC an ip address using the ip command: VPCS> ip 1.1.1.1 On Linux – vpcs should be in the path, so you just need to type: vpcs On OS X – issue this command in a command window (assumes you have GNS3 installed): /Applications/GNS3.app/Contents/Resources/vpcs Quotes are necessary): "\Program Files\GNS3\vpcs\vpcs.exe" On windows – issue this command in a command window (assumes you have GNS3 installed. The idea is that we will open VPCS, and reverse the sending and listening ports of one of the VPCs so we can get two of the VPCs to ping each other. If you are having trouble getting the Virtual PC Simulator (VPCS) to talk to your GNS3 (dyanamips) routers, then you might want to try this quick check to verify that VPCS itself is functioning correctly and that there are no firewall rules blocking UDP ports 20000+ and 30000+ ![]()
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