Running dynagen on windows 7

You can specify default options that apply to for example all , , , , , or s in your lab with [[]], [[]], [[]], [[]], [[]], and [[]] sections. On the , , , and platforms interfaces show in IOS without a slot designation. WIC Modules Dynamips 0.

See the Hardware Currently Emulated section for specific model info and how many WIC slots are provided on each platform. So use that format when specifying adapters in your NET file on those platforms.

You can also manually specific WIC modules much like manually specifying adapters. This is the way real routers would present these interfaces; this is not specific to Dynamips. To add a firewall to your lab, first you must launch the Pemu Server. It could be running also on another computer, creating a distributed lab. However the process does run at a low priority. This significant enhancement allows you to dynamically change your lab by editing the.

Dynagen now supports running without specifying a NET file to load This runs Dynagen with empty lab, and you are able to create the new lab with confDynagen's configuration mode. This is rather clumsy when creating a big lab from scratch - however it could be done.

The following example uses this option in order to illustrate as many of the options as possible. Explicitly specifying here is technically not needed, as it is the default port. NET file, where default options for routers are set.

Minimum setting is the IOS image path. All options set under model default config get applied to the router. The default model is , so we could use command 'router R1' instead of 'router R1 model ' which will work too. This will drop you into router config mode. The 'a', 'f', 'e' commands are for creating connections between routers. The syntax is the same as used in NET files. At this point you can console to the devices and start configuring.

The changes are reflected on the routers either immediately, or after router reload depends on the type of option changed, and the type of device. As you can see in the 'show run' output above there is no adapter card in slot 1 in our This command will virtually insert the card PA-FE-TX in this example into slot1 and create the connection between both routers.

NET file. This is because the other server defined below will use this name when talking to our local system. Second, connecting to a device on another system is as simple as specifying it the same way you would if it was on the local system. We are specifying the TCP port that the Dynamips process is listening on as But if you set up Dynamips to listen on a different port you would specify it here.

When talking to a remote server, you need to specify the working directory for this lab. As you may have noticed in the previous labs, Dynamips stores several files in the working directory. These include the NVRAM for the virtual router, as well as the bootflash, logfiles, and some other working files. When running Dynamips and Dynagen on the same machine, you do not need to specify the working directory, because Dynagen defaults to using the same directory as the network file.

But in a distributed setup the network file is on the client and the working files are on the host. So specify the fully qualified path to the working directory on the Dynamips host. Be sure to use the correct directory separation character for the platform here forward slashes for a Linux system.

This includes the Dynamips server port defaults to TCP , the console ports e. Memory Usage Optimizations As described in the Resource Utilization section your labs can consume a large amount of real and virtual memory. The Ghostios option can significantly reduce the amount of real host RAM needed for labs with multiple routers running the same IOS image. With this feature, instead of each virtual router storing an identical copy of IOS in its virtual RAM the host will allocate one shared region of memory that they will all utilize.

This option can be used in several places: If used at the top level, ghostios is applied to all router instances in the lab If used at the defaults section e. They will be ignored. Dynagen is smart enough only to use ghostios if there is more than one router using the same IOS image. The other files typically created with a router instance are created as well log, nvram, and possibly bootflash files.

Measuring the amount of host memory saved with ghostios can be a little tricky due to the complexities of memory management in modern OSs. For example, on Windows, after the VM space used by cygwin and other libraries dynamips depends on, this only leaves room for 4 router instances MB each!

Enabling sparsemem only allocates virtual memory on the host that is actually used by IOS in that router instance, rather than the entire amount of RAM configured.

This can allow you to run more instances per dynamips process before you have to resort to running multiple dynamips processes. See this FAQ item for more info on this issue. If you use ghostios, the shared memory will be memory-mapped no matter what your mmap setting is. If you enable sparse-mem, no memory mapping will occur for router memory. You can choose to use ghostios or sparsemem separately or together. In this case we must also specify the encapsulation we are using on our routers, so Wireshark will know how to decode the packets.

Communities: Chinese Japanese Korean. All Rights Reserved. The Cisco Learning Network. View This Post. Edited February 16, at AM. How to Install Dynagen on Windows 7? Try GNS3-all-in-one solution; works on my 7. Hi, Would you be able to elaborate? Hi Sorry for the late reply. But when I execute Dynamips Server, it shows an error msg as Unable to create log file Permission denied.

I have administrative rights. If everyone uses this same convention, it will make sharing databases transparent. It is possible that dynamips will not be able to find and idlepc value for an image, or that the values it does find do not work. If this happens, try repeating the process again. Or you just might be out of luck with that particular image however running into this situation is rare. First, we are manually specifying the console port for Zapp port All Ethernet interfaces that are connected to the same LAN are bridged together like connecting them to a virtual hub.

Loading in this lab shows that LANs are second-class citizens, so to speak, in that they are not shown in the device list:. Dynamips and accordingly Dynagen provides support for an integrated frame relay switch.

The format of each Frame Relay switch entry is:. The other two lines are configured similarly, creating a full mesh of PVCs between the three routers. Several things to note here. First, all the routers are stopped. By default, all routers are automatically started when a lab is launched. You can configure multiple Frame Relay switches in a single lab. Dynamips also provides virtual ATM switches. Dynamips can bridge virtual router interfaces real host interfaces, allowing your virtual network to communicate with the real world.

On Windows systems, the Winpcap library is used to accomplish this bridging. Interface specification is a little more complex on Windows systems, so Dynamips provides a command line switch to list the available interfaces on Windows hosts. New to Dynamips as of version 0. Open the Ethernet Switch lab and you will see that connecting Ethernet interfaces to the virtual switch is similar to working with the Frame Relay switch:.

Then, to configure these ports on the switch:. Port 2 is also an access port, but in vlan Port 3 is a trunk port specified with the dot1q keyword with a native VLAN of 1.

Trunk ports trunk all the VLANs known to the switch. If this host interface is connected to a real switch that is configured for trunking, you can now easily connect any router instance to any VLAN you wish. As of Dynamips 0. Working with these models of routers is much like working with s. You can specify default options that apply to all , , , , , or s in your lab with [[]], [[]], [[]], [[]], [[]], and [[]] sections.

When defining routers, the default is to emulate a You can mix and match router models in the same lab. Refer to the Dynamips web site for an up to date list of which network modules are supported.

First we specify the devices to run the local system a Windows XP host :. A windows server the local machine. This is because the other server defined below will use this name when talking to our local system. Second, connecting to a device on another system is as simple as specifying it the same way you would if it was on the local system.

Next we define the other Dynamips server, and the router instance running on it:. A linux server. We are specifying the TCP port that the Dynamips process is listening on as But if you set up Dynamips to listen on a different port you would specify it here. When talking to a remote server, you need to specify the working directory for this lab. As you may have noticed in the previous labs, Dynamips stores several files in the working directory.

These include the NVRAM for the virtual router, as well as the bootflash, logfiles, and some other working files. When running Dynamips and Dynagen on the same machine, you do not need to specify the working directory, because Dynagen defaults to using the same directory as the network file. But in a distributed setup the network file is on the client and the working files are on the host. So specify the fully qualified path to the working directory on the Dynamips host.

Be sure to use the correct directory separation character for the platform here forward slashes for a Linux system. This includes the Dynamips server port defaults to TCP , the console ports e.

As described in the Resource Utilization section your labs can consume a large amount of real and virtual memory. The Ghostios option can significantly reduce the amount of real host RAM needed for labs with multiple routers running the same IOS image.

With this feature, instead of each virtual router storing an identical copy of IOS in its virtual RAM the host will allocate one shared region of memory that they will all utilize.

This option can be used in several places:. Dynagen is smart enough only to use ghostios if there is more than one router using the same IOS image. The other files typically created with a router instance are created as well log, nvram, and possibly bootflash files.

Measuring the amount of host memory saved with ghostios can be a little tricky due to the complexities of memory management in modern OSs. For example, on Windows, after the VM space used by cygwin and other libraries dynamips depends on, this only leaves room for 4 router instances MB each!

Enabling sparsemem only allocates virtual memory on the host that is actually used by IOS in that router instance, rather than the entire amount of RAM configured. This can allow you to run more instances per dynamips process before you have to resort to running multiple dynamips processes. See this FAQ item for more info on this issue. Neither ghostios nor sparemem are enabled by default, so you must turn them on with:. If you use ghostios, the shared memory will be memory-mapped no matter what your mmap setting is.

If you enable sparse-mem, no memory mapping will occur for router memory. You can choose to use ghostios or sparsemem separately or together. Here is an example network file with typical ghostios and sparsemem usage — configured at the top level so that they are applied to all router instances in the lab:. The network file would look something like this:. To view the traffic in real-time, open the file with Wireshark. The capture is continuing to write packets to the output file.

In this case we must also specify the encapsulation we are using on our routers, so Wireshark will know how to decode the packets.