How To - Step By Step Installation of JunOS on GNS3 [Part 4]
Testing
To check if everything work, let’s configure 2 Olives:
root@%cli
root>edit
[edit]
root#
[edit]
root#set system root-authentication plain-text-password
New password:
Retype new password:
[edit]
root#set interfaces em0 unit 0 family inet address 10.0.0.1/8
[edit]
root#commit
commit completeConfigure the other device using the same commands but with another IP address (e.g. 10.0.0.2/8) and ping.
root#exit
Exiting configuration mode
root> ping 10.0.0.2
PING 10.0.0.2 (10.0.0.2): 56 data bytes
64 bytes from 10.0.0.2: icmp_seq=0 ttl=64 time=9.771 ms
64 bytes from 10.0.0.2: icmp_seq=1 ttl=64 time=0.614 ms
64 bytes from 10.0.0.2: icmp_seq=2 ttl=64 time=0.693 ms
64 bytes from 10.0.0.2: icmp_seq=3 ttl=64 time=0.630 msAdditionally, configure OSPF (or any other multicast based protocol) to test if your routers can talk to each other using multicast packets. Again, type those commands on both routers:
root# set protocols ospf area 0 interface em0
[edit]
root# commit
commit complete
[edit]
root# exit
Exiting configuration modeThen monitor the traffic from one of the router, you should see some multicast traffic (from/to 224.0.0.5):
root> monitor traffic interface em0
02:30:30.973748 Out IP 10.0.0.1 > 224.0.0.5: OSPFv2, Hello, length 48
02:30:31.007675 In IP 10.0.0.2 > 224.0.0.5: OSPFv2, Hello, length 48Is everything working? yes? then you are successfully running JunOS! Happy networking
What is working
Here is a list of what has been tested and works. You can extend this list by posting comments on what is working or not for you and I’ll update the list:
OSPF (fxp0) OK
OSPF (em0) OK
A few words about the patch
By default using JunOS with a non-patched Qemu, multicast based protocols didn’t worked. As I have very little driver coding experience (and time to learn), I patched Qemu to allow multicast frames to be received by JunOS, instead of being filtered at the driver level multicast frames are filtered by JunOS. The only problem I see could be on the performance side, as JunOS receives every multicast frames, even those not destined to it. However, I think this is not an issue for a simulated lab environments and it worked just fine so far.
If you feel you can do something cleaner, please don’t hesitate, you can still read one of the Intel manuals concerning the e1000 to have an overview of how complicated driver programming can be 
Conclusion
If you are IT guy (hope you are if you want to play with JunOS), you should be able to run JunOS on your PC without too many issues. I wrote this howto to be as complete as possible, showing how to compile and patch Qemu on 3 different operating systems, installing FreeBSD and JunOS. I encourage everyone to contribute to it by providing fixes, comments or any other help.
Related Articles
How To - Step By Step Installation of JunOS on GNS3 [Part 1] How To - Step By Step Installation of JunOS on GNS3 [Part 2]
How To - Step By Step Installation of JunOS on GNS3 [Part 3]
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