GNS3 supports JunOS
A lot of you will know GNS3. GNS3 is a graphical network simulator that allows simulation of complex networks. With GNS3 you can simulate multiple Cisco routers and the Cisco PIX firewall. GNS3 allows you to emulate real Cisco IOS images, design and experiment with complex networks, connect the virtual lab to the real world and capture packets with tools like Wireshark. I often use GNS3 to test my designs for customers or use it for training and workshop purposes.
As mentioned before GNS3 only supported some Cisco routers and the Cisco PIX firewall. In GNS3 0.7RC1 the emulation of Junipers JunOS is added. Just like the emulation of the Cisco ASA firewall. This makes GNS3 even more powerful. The preparation of a JunOS image is not as straightforward as an IOS one, but GNS3 wrote this excellent article for emulating a JunOS image.
I recommend GNS3 for everyone how is playing and likes to play with Cisco routers and firewalls, and from now on also Juniper routers.
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