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deploying zone based firewalls digital short cut ivan pepelnjak

Deploying Zone-Based Firewalls (Digital Short Cut)

Common deployment scenarios are included to highlight proper use of this powerful Cisco IOS feature. Enter your mobile number or email address below and we'll send you a link to download the free Kindle App. Then you can start reading Kindle books on your smartphone, tablet, or computer - no Kindle device required. To get the free app, enter your mobile phone number.

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Simulate Zone Based Firewall in GNS3

Introduction to Zone-Based Firewalls Chapter 2: Firewall with a Perimeter Network Chapter 5: Read more Read less. Enabled Optimized for larger screens. Kindle Cloud Reader Read instantly in your browser.

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Your browser failed to load CSS style sheets. Your browser or web proxy might not support elliptic-curve TLS. Please read our Blog Commenting Policy before writing a comment. The log function uses CEF switching explained in a more detailed answer. For example I would like to permit https traffic and reject everything else. Thank you and Kind regards,Marko. As the answer might interest many readers, I wrote a new post about it.

I've read your book, which I found clear and well put together. I was, however, left wondering why there was such little apparent use made of the feature in real life.

Deploying Zone-Based Firewalls (Digital Short Cut)

IOS Zone-based firewalls are supposed to be easier to set up and understand arguable , more precise, and possibly offering higher throughput, but there seem to be relatively few examples of their use, even with their support in SDM 2. For example you still need to use Access Control Lists to let particular types of icmp through, because the ZBF operates on a protocol basis. Even with SDM, there is a good deal of setting up of the building blocks before you can use them. Am I missing something?

Thanks for your thoughts about the book: I would assume that the current low acceptance of the zone-based configuration is based both on the release it's available in I would never put an "experimental" IOS release like a T release in my production network unless forced to do so by a mandatory feature or new hardware platform as well as relative unfamiliarity people still think in terms of access lists.

What happened?

I also agree with you that the configuration interface is a bit baroque with classes, policies, inter-zone service policies However, try writing an access list for a complex firewall with 4 or 5 zones where you have to merge all your inter-zone policies into a single access list and you'll start appreciating the zone-based configuration.

The configuration model is even more useful if you have multiple zones that have the same inter-zone policy toward a target zone for example, all internal zones have the same policy toward the Internet. Having said all that, a year ago, I would probably still stick to the access-lists even if the zone-based configuration would be available in a GD release if I'd have to do a quick configuration job.

Having climbed the learning curve, I will definitely use the new approach in my future projects I have just provisioned a router with from scratch using SDM2. It now installs a zone-based firewall by default. You're right regarding the IPSec issues, I also wrote a post detailing the rules of the self zone usage. Interesting, will check it in my lab: The other thing that I am noticing is that cymru BGP appears to be trying to send a message from port into a random high-numbered port in my router.

This gets blocked, even though I am inspecting outgoing bgp. A further example that would be helpful is the setup for SIP. I also seem to have to open UDP to get the RTP connection to work; otherwise, it just seems to be blocked, even if it is open. An apparent limitation of the ZBF approach is that out-of-order packets in TCP streams are not cached and reassembled before they are inspected by IPS or the firewall http: I wrote a post about this problem a while ago, but as it was mis-labeled, even I had problems finding it: The only situation where you'd get out-of-order TCP packets in real life is if a box anywhere in the end-to-end path is doing per-packet load sharing I notice that configuring deep packet L7 http inspection seems to kill my download speed.

Is there a work-around? Apart from buying a faster router, disabling the deep packet inspection or upgrading IOS and hoping that a newer release is more optimized , there's not much you can do, it's a CPU-intensive task. Hi guys, I'm slightly confused. Is the zone based feature available on Cisco ASA's or is it purely a router feature?

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Deploying Zone-Based Firewalls (Digital Short Cut) Ivan Pepelnjak ISBN: 1- Improved firewall policy configuration means network. Deploying Zone-Based Firewalls, Digital Shortcut - Kindle edition by Ivan Pepelnjak. Download it once and read it on your Kindle device, PC, phones or tablets.

If it is available what OS version? This book describes the IOS implementation available in