IT Network
I have GNS3 which I setup 4 days and I was able to work and design some topologies, access routers and switches through telnet. All of a suddn when I try to add a switch on local server or on VM, I get 'Switch1': Telnet access for switches is not available in this version of GNS3. This is normal, simple switches in GNS3 don't have a console. Each router console port (usually called telnet port in GNS3) is used 2000 2001 2002 2003 I think i am able to connect each router from my remote PC (which is in the same LAN) GNS3 192.168.1.100 Port: TCP 2000,2001,2002,2003 (telnet is enabled with password in startup-configuration for each Router 1-4).
There are many problems were experienced when using Cisco ASAv firewall virtual servers in GNS3 network simulation software. Fortunately, all of those issues had been fixed in GNS3 VM virtual machines security. In this article will present you about how to configure Cisco ASAv firewall virtual servers image with qcow2 virtual security appliance format in GNS3 VM virtual server.
Cisco ASAv firewall virtual servers is referring to Adaptive Security Virtual Appliance (ASAv) of Cisco virtual security appliance firewall product. Even though it is a virtual security appliance, yet it brings a full firewall managed security services functionality the same as hardware appliance to a virtualized environments with a secured traffic and multi-tenant environments. It is very easy and fast for disaster recovery comparing to hardware appliance since it is running on server virtualization or in an data center virtualization.
In this article of configuring ASAv firewall virtual servers, it is assumed that:
a. you already have GNS3 VM virtual server installed up and running on your computer. In case that you don't, please refer to this link. Installing GNS3 VM on VMware Workstation
b. you have already downloaded Cisco ASAv virtual machines security qcow2 image (asav941-203.qcow2, asav971.qcow2, or asav981-5.qcow2), a hda file from the Cisco website. Cisco service contract is needed to be able to download it.
Go to 'Edit', click on 'Preferences'. On preferences window, under 'QEMU' option click on 'Qemu VMs' and then click 'New' to add to Cisco ASAv firewall virtual servers qcow2 image of the virtual firewall appliance.
Selection the option of 'Run the IOS on the GNS3 VM' to run Cisco ASAv on GNS3 VM virtual machines security. Then, click 'Next' to continue.
Give a Name the firewall virtual servers, 'ASAv94' as in this article, click 'Next' to continue.
Select the x86_64 Qemu binary and set the RAM to 2048 BM. click 'Next' to continue. ASAv firewall virtual servers need at lease 2048 MB of RAM to works.
Select 'New Image', then browse to the locate where you had download ASAv firewall virtual servers qcow2 file (asav941-203.qcow2), and click 'Open' to upload the file to your GNS3 VM virtual server. Once it has finished uploading, click 'Finish'.
On preferences window, under 'QEMU' option click on 'Qemu VMs' and then click 'Edit' to edit some configuration for new added Cisco ASAv firewall virtual servers qcow2 image virtual firewall appliance.
Under the 'General Settings' On Symbol section, browse for ASA symbol. On Category section, select 'Security Devices'. On Console type section, choose 'vnc' option. In section 4 of this article will talk about telnet for console access.
Under the 'Network' tab within the QEMU VM configuration, Install 6 network card adapters for ASAv firewall virtual servers by setting number 6 to Adapters section. Set the first ASAv firewall virtual servers interface name to Management0. In the Name format section set it to Gi0{0}. Then, click 'OK'. Click 'OK' again to save the configuration.
ASAv firewall virtual servers now should appear under 'Security Devices' window on the main GNS3 screen . Let create a new project to see if ASAv firewall virtual servers image is working properly.
After we power on the ASAv firewall virtual servers, it will automatically reboot once during the initial power-up. This happen after it finished determining the device platform. It will stop at the ciscoasa> prompt after the second boot as in bellow picture.
Now you can start playing with ASAv firewall virtual servers as a network security tools in your lab for what ever you wish for.
Working with ASAv firewall virtual servers via VNC isn't really sound comfortable for me. I would prefer to work with it via telnet access instead.
To work with ASAv firewall virtual servers through telnet, we need serial port to be enabled. Unfortunately, ASAv firewall virtual servers serial port is disabled by default. However, we still can manually enable it. We need to create a file on the root of Disk0: called use_ttyS0 to enable the serial interface. The easiest way to accomplish this is to clone the existing coredumpinfocoredump.cfg file and rename it. To clone it, use the following commands. That S0 is capital letter S and number zero 0 not S and the letter O. Verify that the file is cloned successfully with the command dir.
ciscoasa#copy disk0:/coredumpinfo/coredump.cfg use_ttyS0
Now you can shutdown your ASAv firewall virtual servers and change the console type from 'vnc' to 'telnet' instead by right click ASAv, and select configure. We don't need to save the configuration of ASAv firewall virtual servers at this point.
Power on your ASAv firewall virtual servers back, right click on it and choose console to open the access. ASAv firewall virtual servers needs sometime to boot up. After it finished booting up, you will see something as the following.
Now you should be able to configure ASAv firewall virtual servers in qcow2 image format with GNS3 VM virtual server. It is really a great network security tools to do your ASAv firewall lab with firewall virtual servers before you start working with your production ASA firewall. That is all about configuring ASAv firewall virtual servers with GNS3 VM virtual server for now. If you have any questions or suggestions you can always leave your comments below. I will try all of my best to review and reply them. Thank you and enjoy your ASAv lab on GNS3 VM.
ASAv firewall virtual servers now should appear under 'Security Devices' window on the main GNS3 screen . Let create a new project to see if ASAv firewall virtual servers image is working properly.
After we power on the ASAv firewall virtual servers, it will automatically reboot once during the initial power-up. This happen after it finished determining the device platform. It will stop at the ciscoasa> prompt after the second boot as in bellow picture.
Now you can start playing with ASAv firewall virtual servers as a network security tools in your lab for what ever you wish for.
Working with ASAv firewall virtual servers via VNC isn't really sound comfortable for me. I would prefer to work with it via telnet access instead.
To work with ASAv firewall virtual servers through telnet, we need serial port to be enabled. Unfortunately, ASAv firewall virtual servers serial port is disabled by default. However, we still can manually enable it. We need to create a file on the root of Disk0: called use_ttyS0 to enable the serial interface. The easiest way to accomplish this is to clone the existing coredumpinfocoredump.cfg file and rename it. To clone it, use the following commands. That S0 is capital letter S and number zero 0 not S and the letter O. Verify that the file is cloned successfully with the command dir.
ciscoasa#copy disk0:/coredumpinfo/coredump.cfg use_ttyS0
Now you can shutdown your ASAv firewall virtual servers and change the console type from 'vnc' to 'telnet' instead by right click ASAv, and select configure. We don't need to save the configuration of ASAv firewall virtual servers at this point.
Power on your ASAv firewall virtual servers back, right click on it and choose console to open the access. ASAv firewall virtual servers needs sometime to boot up. After it finished booting up, you will see something as the following.
Now you should be able to configure ASAv firewall virtual servers in qcow2 image format with GNS3 VM virtual server. It is really a great network security tools to do your ASAv firewall lab with firewall virtual servers before you start working with your production ASA firewall. That is all about configuring ASAv firewall virtual servers with GNS3 VM virtual server for now. If you have any questions or suggestions you can always leave your comments below. I will try all of my best to review and reply them. Thank you and enjoy your ASAv lab on GNS3 VM.
Gns3 Telnet Connection Refused
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Telnet Gns3
In GNS3 you can configure a graphical console (VNC or Spice) ora telnet console for a QEMU VM,but you can't have both simultaneously.In some situations it would be nice to have access to both consoles,so let's try that.
From the technical point of view there is no reason for this restriction,these consoles connect to different virtual hardware,that are working independently.The graphical console uses the virtual video card and keyboard,while the telnet console uses the virtual serial (COM1) interface.On the QEMU command line you are able to configure both interfaces,it's a GNS3 limitation for not supporting that.A workaround is to get one console configured by GNS3,the missing console type can be configured in the additional settings of QEMU.
The additional settings can be changed in thenode configuration of a specific node.I don't recommend using the VM templates in the QEMU preferences for that.Each device needs a unique device/port number,that's not possible by using VM templates.
The main console of a device uses telnet,add -vnc : into the additional settingsfor having an extra graphical console.For the VNC display number use any number from 0 - 99,that is not in use by another device.As GNS3 allocates numbers starting with 0 it's a good ideato use a high number,for example 55 as in the screenshot above.
Then start the device.The telnet console can be opened within the GNS3 GUI,but the graphical console needs to be started manually.First we need to find out the IP address of the VNC console.It's the same as the IP address of the telnet console,shown in GNS3 in the topology summary of the device.
Gns3 Asa Telnet
Now start your VNC program andopen a connection to that IP address and the display number you configured.Some VNC clients don't use the display number, they need a port number.For these use port 5900 + ,so for display 55 enter port 5955.
Asa Gns3 Telnet
Likewise for devices using graphical consoles as their main console,telnet has to be configured in the additional settings,add -serial telnet::,server,nowait.By default GNS3 uses the ports 5000 - 10000 for telnet,starting with port 5000.So choose a port quite high in this range, for example 5555.But be sure to use a port, that's not allocated to another device.
Telnet Asav Gns3
After starting the device, you can open the graphical console by GNS3.Then start your telnet application (for example PuTTY).Like in the previous section use the IP addressof the VNC/Spice console shown in the topology summary.The port is the same you configured in the additional settings.
