If you ever needed to hide multiple systems behind a single IP address you would use PAT. (Port Address Translation) besides using this to connect to the internet when using an RFC 1918 address, you can configure PAT for VPN connections. The benefit is the same, hide multiple systems behind a single IP address with the advantage being you can have many systems on one side of the VPN tunnel all using that single IP.
I was working with a Cisco 9372TX switch, and on it I had two 40Gbps uplinks that we where using out of the available four. Talking with our VAR because we where planning on connecting in additional equipment that only supported SFP+ interfaces. So the solution was to connect to this switch with QSFP to SFP+ adapters. Thinking this would be a simple change because we are just plugging in additional adapters on the QSFP ports we planned our maintenance window and rollback plans but I wasn’t expecting a rollback for this one 🙂 Continue reading
Just wanted to put this up has Cisco has recently released VIRL. This is a network simulation platform that you can run Cisco operating systems on which are the same operating systems that run on Cisco hardware so anything you do in this simulation environment would be realistic if it was running on dedicated hardware. You would be able to test your changes before throwing them in production.
Some things that are different between VIRL and CML (Cisco Modeling Labs)
- CML is Cisco TAC supported so you can call Cisco. With VIRL you have community to help you out.
- You have cap of 15 devices with VIRL. The CML version capacity is dependent on the hardware its running on.
- CML is for the “Big Guys”, and way more expensive. VIRL is just for personal/training use. (i.e CCNA, CCNP, CCIE)
To be upfront I have not purchased VIRL so I can’t tell you my thoughts on the product itself but personally I think this is great way to learn and study Cisco certifications when looking at CCNP and even CCIE. This is way cheaper than buying hardware or renting rack space. The price is $199.99 a year and I would assume this would cover any updates the product has. Cisco is also selling an Academic Version for $79.99 a year with some extra terms attached to it.
I’m curious if anybody has any thoughts on VIRL, what advantages do you think this network simulation program (VIRL) has compared to GNS3? What do you think VIRL’s target audience is? Is this price too high? Finally do you think the product is too green? Are you going to buy it or wait and see?
I have had the opportunity to take and thankfully pass Cisco certifications at the associate levels and there is one more associate exam, the CCNA Data Center which hopefully I will get later next year. While looking at the CCNA Data Center exam I also glanced over the professional arena that Cisco offers and if you’re like me I always like learning new things especially in technical field. Getting those “aha moments” once in a while makes it worth it, but beyond just over all knowledge of additional technologies why would you go on taking a professional Cisco cert? Continue reading
Working towards the CCNA Cisco talks about a hierarchical network there are three layers to this design. Access Layer, distribution layer and the core layer. Each of them have their own set of functions and is also considered to be a best practice when the network continues to grow and for redundancy along with just a better way to manage it. Continue reading