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How do you get GNS3 to interact with "real" equipment?
earweed
Member Posts: 5,192 ■■■■■■■■■□
in CCNA & CCENT
I've heard about using GNS3 along with "real" switches for studying and didn't find anywhere how to do this.
No longer work in IT. Play around with stuff sometimes still and fix stuff for friends and relatives.
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Optionsjahsoul Member Posts: 453I've heard about using GNS3 along with "real" switches for studying and didn't find anywhere how to do this.
[FONT="]Here is the tutorial site.
Dynamips / Dynagen Tutorial
[/FONT]Reading: What ever is on my desk that day :study: -
Optionschmorin Member Posts: 1,446 ■■■■■□□□□□Tons of tutorials for this out in the interwebs, and it looks like some people threw out some links.
In a nut shell:
1) Toss down a cloud.
2) Associate the cloud with your NIC.
3) plug your NIC into your equipment.
Bang-Zoom-WowCurrently PursuingWGU (BS in IT Network Administration) - 52%| CCIE:Voice Written - 0% (0/200 Hours)mikej412 wrote:Cisco Networking isn't just a job, it's a Lifestyle. -
Optionsbermovick Member Posts: 1,135 ■■■■□□□□□□For the most part, it's just creating a loopback interface (if you don't already have one), and bridging the loopback and your actual network interface.Latest Completed: CISSP
Current goal: Dunno -
Optionsthehourman Member Posts: 723For the most part, it's just creating a loopback interface (if you don't already have one), and bridging the loopback and your actual network interface.
So far I have setup my SDM to connect to my 2621XM in GNS3.
Ok, I only have one gigabit port on my PC, is it possible to connect all three switches and four routers to my GNS3 lab?
Or do I need to get more NIC cards/usb?
ThanksStudying:
Working on CCNA: Security. Start date: 12.28.10
Microsoft 70-640 - on hold (This is not taking me anywhere. I started this in October, and it is December now, I am still on page 221. WTH!)
Reading:
Network Warrior - Currently at Part II
Reading IPv6 Essentials 2nd Edition - on hold -
Optionsbermovick Member Posts: 1,135 ■■■■□□□□□□You shouldn't need more NICs; by bridging your Gigabit card, you're sortof making a virtual cable from whatever switch port hooks to your PC, through the PC bridge you made, into the 'cloud' you created in gns3, and into whatever you have the cloud connected to. Think of your PC as a 2-port switch/bridge, with the nic as 1 port and the loopback as the other.Latest Completed: CISSP
Current goal: Dunno -
Optionsearweed Member Posts: 5,192 ■■■■■■■■■□For the most part, it's just creating a loopback interface (if you don't already have one), and bridging the loopback and your actual network interface.
Also, If I stick an extra NIC (or 2) on my PC can I use these as interfaces for my real equipment? I'm looking to purchase hardware but since I'll have to buy a little at a time I'm gonna buy switches first and use GNS3 for the routers until I get real routers.No longer work in IT. Play around with stuff sometimes still and fix stuff for friends and relatives. -
Optionschmorin Member Posts: 1,446 ■■■■■□□□□□Noob here, how exactly do you create a loopback interface,
Also, If I stick an extra NIC (or 2) on my PC can I use these as interfaces for my real equipment? I'm looking to purchase hardware but since I'll have to buy a little at a time I'm gonna buy switches first and use GNS3 for the routers until I get real routers.
You would only use a loopback if you want the virtualized equipment to be able to interface with your computer. You would point the cloud to the NIC on your computer to connect it to whatever the NIC is connected to.
I'll probably end up making a GNS3 tutorial sometime in the future. I'll let you know.Currently PursuingWGU (BS in IT Network Administration) - 52%| CCIE:Voice Written - 0% (0/200 Hours)mikej412 wrote:Cisco Networking isn't just a job, it's a Lifestyle. -
Optionsearweed Member Posts: 5,192 ■■■■■■■■■□Thanks, I'm linking this and a few other threads and sites to my "taking the CCENT/CCNA thread to keep them together and to minimize the bookmarks I have on my computer.No longer work in IT. Play around with stuff sometimes still and fix stuff for friends and relatives.
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Optionsearweed Member Posts: 5,192 ■■■■■■■■■□I got offered free use of a Boson simulator for my CCNA studies. Anyone here use(d) it and your opinion of it.
Upside
Downside
Howare the simulations and how does it compare to the real thing (hardware)No longer work in IT. Play around with stuff sometimes still and fix stuff for friends and relatives. -
Optionschmorin Member Posts: 1,446 ■■■■■□□□□□Howare the simulations and how does it compare to the real thing (hardware)
While I can't speak from boson, I'll tell you real world experience working with the equipment is much more valuable than any lab. However, a lab to me has always been a lab. Meaning it does not matter how you drill the studies, but as long as you actually are drilling them.Currently PursuingWGU (BS in IT Network Administration) - 52%| CCIE:Voice Written - 0% (0/200 Hours)mikej412 wrote:Cisco Networking isn't just a job, it's a Lifestyle. -
Optionsbermovick Member Posts: 1,135 ■■■■□□□□□□You would only use a loopback if you want the virtualized equipment to be able to interface with your computer. You would point the cloud to the NIC on your computer to connect it to whatever the NIC is connected to.
I'll probably end up making a GNS3 tutorial sometime in the future. I'll let you know.
This is pretty important; a GNS3 topology doesn't need to interface with your computer or physical equipment; you can 'console' into one of the routers and ping / traceroute / whatever to verify connectivity to the other side of the virtual network without needing any of it to see your default gateway or anything.Latest Completed: CISSP
Current goal: Dunno -
Optionsmikej412 Member Posts: 10,086 ■■■■■■■■■■your opinion of it.
Upside
Downside
Upside: It's enough to get you past the CCNA exam. The included labs work with the simulator and help teach you the things you need to know and should be able to demonstrate hands on for the CCNA exam.
Downside: Cost -- you can build a real hardware lab for the same price. If you go outside the included labs you may hit a software bug. If you want to go beyond the CCNA basics (and the included labs) the simulator may not support the commands or work as expected (like the real hardware).
Hopefully it's gotten better since the last time I looked at it. If they offered the CCNP version (and CCNA/CCNP labs) for the cost of the CCNA version (and kept making it better) then it might be worth it just for the convenience of being able to lab anywhere you can go with your laptop.:mike: Cisco Certifications -- Collect the Entire Set! -
OptionsNetwurk Member Posts: 1,155 ■■■■■□□□□□If you want to go beyond the CCNA basics (and the included labs) the simulator may not support the commands or work as expected (like the real hardware)
Good point by Mike here. One thing I've seen from folks who have used Boson is that the short form of commands is different than the real thing. For instance, I saw a guy complaining in a thread (not on this site) that the command span portfast would not work for him on the test no matter how many times he entered it. Problem was that he was trained on Boson and on some platforms span is also short for SPAN commands which are used by the Switched Port Analyzer (SPAN) feature. So if he had entered spann portfast he would have been fine.
The guy complained that he ran out of time due to how long it took for him to answer the portfast question and that all his other short form commands worked. But of course the Cisco tests emulate real equipment, not Boson sims.
The nice thing about GNS3 is that it uses the real Cisco IOS. It's not perfect, but it is way better than Boson.
I use GNS3 to save me from tearing down my existing lab to experiment on a router lab exercise. It's cool to know how to connect it to your physical lab, but I don't do it as it would only further complicate my lab configs. One less thing to troubleshoot.
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Optionsthehourman Member Posts: 723Good point by Mike here. One thing I've seen from folks who have used Boson is that the short form of commands is different than the real thing. For instance, I saw a guy complaining in a thread (not on this site) that the command span portfast would not work for him on the test no matter how many times he entered it. Problem was that he was trained on Boson and on some platforms span is also short for SPAN commands which are used by the Switched Port Analyzer (SPAN) feature. So if he had entered spann portfast he would have been fine.
The guy complained that he ran out of time due to how long it took for him to answer the portfast question and that all his other short form commands worked. But of course the Cisco tests emulate real equipment, not Boson sims.
The nice thing about GNS3 is that it uses the real Cisco IOS. It's not perfect, but it is way better than Boson.
I use GNS3 to save me from tearing down my existing lab to experiment on a router lab exercise. It's cool to know how to connect it to your physical lab, but I don't do it as it would only further complicate my lab configs. One less thing to troubleshoot.
What OS do you use? (Windows, Mac, Linux)
I have it on Linux and never gotten a problem, other than I can't use SDM and no loopback interface, so no cloud.
Therefore, I installed GNS3 on my Win7. Then all the stuff that I can't get from Linux I can run them under Win7; however, I can't keep my putty consoles open. They keep closing for no reason, and when I try to open them they close right away.
The CPU processes is about 15% with 5 routers and 2 clouds (internet and SDM).
Any idea man, why the console terminal can't stay open?Studying:
Working on CCNA: Security. Start date: 12.28.10
Microsoft 70-640 - on hold (This is not taking me anywhere. I started this in October, and it is December now, I am still on page 221. WTH!)
Reading:
Network Warrior - Currently at Part II
Reading IPv6 Essentials 2nd Edition - on hold -
Optionsearweed Member Posts: 5,192 ■■■■■■■■■□The nice thing about GNS3 is that it uses the real Cisco IOS. It's not perfect, but it is way better than Boson.
I use GNS3 to save me from tearing down my existing lab to experiment on a router lab exercise. It's cool to know how to connect it to your physical lab, but I don't do it as it would only further complicate my lab configs. One less thing to troubleshoot.
The Boson will stay on the laptop so I'll have a convenient lab wherever I'm at.No longer work in IT. Play around with stuff sometimes still and fix stuff for friends and relatives. -
Optionsbermovick Member Posts: 1,135 ■■■■□□□□□□You should already have a loopback under linux:
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:112360 errors:0 dropped:0 overruns:0 frame:0
TX packets:112360 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:125397239 (119.5 MiB) TX bytes:125397239 (119.5 MiB)
The tricky part is making a bridge. I looked this up and found a script you can run before starting gns3:
... which apparently I've lost.. dangit.
Actually (and I think this is a no no, but I'd already done all the work of writing up how to get gns3 working (with a cloud) under linux, as well as getting sdm working as well, and I'm too lazy to just re-write it all.
Linux + GNS3 + SDM?Latest Completed: CISSP
Current goal: Dunno -
Optionsmikej412 Member Posts: 10,086 ■■■■■■■■■■You can either add a bunch of real NICs (supported multiport or USB) to a PC (or multiple PCs and distribute your virtual routers over several PC).
Or you can use the simulated switch and VLANs that's available within Dynamips/Dynagen and use your PC's NIC to trunk out to a real switch -- and you the use the corresponding switchport on that switch to attach to your real hardware as if it were the real Ethernet port on the emulated routers.
http://www.techexams.net/forums/ccie/40234-new-idea-unknown-if-working.html#post293219:mike: Cisco Certifications -- Collect the Entire Set!