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mark_3094 commented on
r/CiscoPosted by

To do it legally, you would need a smartnet. You can then log onto the Cisco downloads site and download it from there.

Do you have a support agreement on this router?

30

I recently created this video on how binary works:

https://youtu.be/o9BIuMklUWA

Binary is important to understand in computer science! I hope you like it

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12 comments
3 points · 10 days ago

How would we determine that a string of binary is a piece of text, a cpu instruction, a memory location, etc??

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Original Poster1 point · 10 days ago

Something needs to interpret it. It doesn't always get it right though. Try opening a Windows executable in notepad, and you will see what I mean.

In this case, notepad just interprets it as best as it can - and gets it wrong.

Same case when coding. You can put a value in a pointer in C. C will assume that the value you gave it is an address in memory. If you gave it the wrong value, it will just forge ahead as best as it can.

So in short, there's no sure way to know what a value is for...

This is great man! Thanks for sharing

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Original Poster1 point · 10 days ago

You're most welcome!

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1

So you've heard that computers use 1's and 0's... But what does that actually mean?

This is called binary, and is the computers 'language'. This is used by the computer in storing, transmitting, and interpreting information.

I've created a short video (less than 4 minutes) in an attempt to explain how to use binary

https://youtu.be/o9BIuMklUWA

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That works! But I don't know how... What's this script doing?

The simple introduction on control plane and the data plane.

What are they used for? What's the difference? What do they do?

https://youtu.be/P9ZMugAf9lU

Thanks for that! Love the content on your Network Direction channel. The VxLAN playlist is awesome!

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You're welcome! It's great that you like the channel

31

Some time ago I was wondering what the control and data planes were all about. They seemed to be mysterious, yet very important.

It's not something that I needed for the CCNP exam per se, but it is very useful nevertheless.

I've done some research, and created this video. I hope you like it!

https://youtu.be/P9ZMugAf9lU

31
8 comments

Thanks for sharing this!

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Original Poster1 point · 23 days ago

You're welcome :)

Great stuff! Subscribed!

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Original Poster1 point · 24 days ago

Thanks! I appreciate it!

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4

Sometimes we hear the network guys talking about 'protecting the control plane', or 'forwarding through the data plane'.

These can be somewhat mysterious terms when you first hear them. So what are these guys talking about?

In this short video, I try to clear the matter up a bit.

https://youtu.be/P9ZMugAf9lU

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2

When you're designing, you will need to know what the control and data planes are, and how they're different.

I hope this clears things up a bit:

https://youtu.be/P9ZMugAf9lU

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2

We hear about the control and data plane quite a bit. The control plane seems to need protecting, while the data plane seems to need throughput.

All this can be confusing. After all, what's the difference between the two?

This video can clear this up a bit

https://youtu.be/P9ZMugAf9lU

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20

I had a problem recently, where a VPN between AWS and an ASA would drop traffic regularly every hour.

Eventually I got to the bottom of the problem, and was able to resolve it. It was related to timers that should have been negotiated between the endpoints. For whatever reason, this wasn't happening.

I have a write up here. I hope this will save you some time if you have the same issue

https://networkdirection.net/blogpost25-AWS-to-ASA-VPN-Issues

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6 comments

To add:

Earlier versions of ASA code could need "originate only" on the customer side's crypto map, if you had redundant tunnels and had trouble keeping them up. This wasn't documented, I think, but if you had to talk to an Amazon support engineer, they'd ask you to include it.

As you update the ASA to newer versions of code, you need to remove "originate only".

This bit us earlier this year, when we upgraded from one minor version to another pursuant to one of the ASA vuln announcements. A few weeks later, our customer said "Hey, our tunnel hasn't been stable for a while." No concrete timeframe, so we didn't associate it with the code upgrade, and chased our tails a bit.

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I remember first learning the ASA and this bit me in the ass. We had several VPN tunnels connected from hospitals all over the U.S. back to our office in Seattle. We were using Sonicwalls at first and then replaced them during lifecycle with ASA's and the learning curve was ridiculous. I am definitely glad that I learned it though and now I love the ASA.

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Original Poster1 point · 28 days ago

There's a lot of love/hate around ASA's. Sometimes with good reason, sometimes without.

They have room for improvement, but I quite like them

Original Poster1 point · 28 days ago

That's really good to know, thanks

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Original Poster3 points · 1 month ago

I guess I should mention the helpful stuff:

  • You need to read the OCG for this. There are some things particular to IGPs that you need to know that is only covered in that book. Every other resource regarding this claims there isn't an exact answer; yet these schmucks seem to have found something exact :\
  • LPT: Don't have the books, resources you need? Do a free-trial of safari. Totally awesome resource for this.
  • Read /u/mark_3094 's posts on his blog. The ASA stuff really helped me out.
  • The IINS book (CCNA Security, newest version) has some good info on Security regarding web-filtering.
  • Cisco Live has a great video from Beau Williamson that's an intro to Multicast. SUPER AWESOME.

... and for real, some of this exam is just poorly written. I had to take this exam 3 times (first one was at Cisco Live, which was free). Two of those were out-of-pocket.

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Great to hear! Good work

8 points · 1 month ago

If you have a gateway set, the packets are sent to the gateway to route them.

If you don't, the router could be proxy-arping the requests.

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Proxy ARP was the first thing that came to my mind too

33

Hi Everyone,

I created a video (below) to help with understanding the OSI model, and I'd like to share it here. Hopefully some of you will find it useful while studying.

It covers the layers of the OSI model, how to remember them, and what they do. It even has a look at how web traffic is handled in the OSI model.

I hope you like it!

https://youtu.be/y9PG-_ZNbWg

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16 comments

It's not quite as memorable as the mnemonic I use, but it's also a lot less offensive, so I should probably remember it just in case.

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Original Poster1 point · 1 month ago

I'm curious now...

5 points · 1 month ago · edited 1 month ago

Let's see if the spoiler tag works.

A Pussy So Tight No Dick Penetrates (NSFW)

Edit: it works in Reddit Is Fun but not in Chrome on my phone. Hrm.

Edit2: let's try this new one.

Edit3: nope. Oh well.

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Original Poster2 points · 1 month ago

Wow, yeah, I won't forget that. I think the other one's a bit safer for youtube :)

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It's well presented, but it's very fast.

Is the goal to fit everything into a single minute? It sounds like a good brand, but that brand may harm more than help.

Original Poster2 points · 1 month ago

Thanks.

That is the goal. Time will tell if it works or not. I'm not looking to become the next Linus or anything, so I'm not overly worried if it doesn't take off. Just having fun making some educational videos and hope some others find them helpful.

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I know what you mean. I do the same thing!

17

One of the fun things about BGP and VRF's is being able to leak routes. We take a route-distinguisher, export the routes from a VRF into BGP, then then import them into another VRF.

Sometimes that's too much. We don't want to leak every route in the routing table. So instead, we can create an export-map to get granular (and really tune those BGP communities).

But a whitelist is also important, to prevent any accidental leaking.

How these work, and how they're configured are all in this video:

https://youtu.be/GeIfsVPs4o0

I hope you like it!

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4 comments

Also subscribed. Don't generally touch that kind of stuff in my day-to-day but they look really well produced. Not to mention you can always learn more!

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Original Poster1 point · 1 month ago

Thanks! It's true, there's always more to learn.

Subscribed. Looks like a great channel for some freshers when I'm not watching INE videos everyday. Thanks!

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Original Poster1 point · 1 month ago

I appreciate that, thanks!

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Hi All,

I've been using VRF's a lot recently, so I'm sharing some of what I've learned along the way.

Here's a video on leaking routes between VRF's:

https://youtu.be/GeIfsVPs4o0

This uses several route-target import and export commands to takes the routes from one VRF, place them into MP-BGP, and then import them back into another VRF.

We also look at using export-maps to be more granular, and creating whitelists to prevent accidental leaking.

I hope you enjoy it!

26
2 comments

Just wanted to say your videos are great

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Original Poster1 point · 1 month ago

Thanks!

1

I'm having trouble with YouTube's analytics.

I've recently been monetised (yay!), and the revenue seems to be different on the phone app and the site.

In addition to that, the value on the dashboard is different to the value in the analytics section (the dashboard also uses the pound symbol, not dollar).

Any ideas on why these discrepancies exist? Which one should I believe?

Thanks

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21

I've created a video that I would like to share here. In the past I've wondered how we keep routes separate across several routers, considering that VRF's are local to each router.

The answer is with a combination of Route-Targets, Route-Distinguishers, and MP-BGP. I've put what I learned about this into this video. It also has a little MPLS.

I hope it's useful to you too.

https://youtu.be/dW8JjcINgDg

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6 comments

Awesome video. Thanks for making this. I'm going to save this to share with some colleagues to help explain MPLS/VRF. They way you explain that using MPBGP to distribute the routes is a completely separate thing from the actual forwarding of customer traffic across the core I think is very insightful and helps clear up some "mud"

Thanks again!

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Original Poster2 points · 2 months ago

Thanks for the feedback, and I'm glad to have cleared up the mud a bit.

I also found this to be a tricky point early on, and this is how I eventually came to understand it. It's good to hear that it works for you too.

Just watched this yesterday. Super helpful and informative!

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Original Poster2 points · 2 months ago

It's good to hear that it's working for you :)

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Recently I've created some videos on VRF's. Here's the next part, which uses route-targets and route-distinguishers to extend VRF functionality across routers.

This also covers MP-BGP, and touches on MPLS.

https://youtu.be/dW8JjcINgDg

7

I've written an article on Traffic Domains in NetScalers, and how to configure them.

If you're interested, have a look here:
https://networkdirection.net/NetScaler+Traffic+Domains

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105

Are you new to networking? Or do you need to brush up for the exam?

Either way, I think I can help! I recently wrote this article on the OSI Model. I hope it's useful to you

https://networkdirection.net/OSI+Model

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11 comments

Thank you!

It looks bearable on a PC browser (with ad block). On mobile it was difficult to stay with it... The ads made it look gimmicky.

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Original Poster2 points · 2 months ago

Thanks again. I've just made some settings. Not sure if that will fix it.

It's hard to get the right balance on mobile.

Thanks for bearing with me

So many ads =/

Hard to read on mobile without ad-block.

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Original Poster4 points · 2 months ago

Thanks for bringing this to my attention in a courteous manner.

I don't normally see the mobile version, so I didn't realise it was so bad.

I will look at tuning this so it's not so bad. I need to find a balance where there are some 'reasonable' ads which can support the cost of the website, without getting this annoying.

I'll see what I can do about this.

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19

A few weeks ago I shared a video I made on how VRF's work. Now, I'd like to share a follow up video on how to use OSPF, EIGRP, and BGP with VRF's.

This uses a lab environment, so you can follow on yourself if you want.

https://youtu.be/7RtoNTK-mgE

I hope you like it!

Original post:

http://goedhartvoordieren.nl/?page=r/ccnp/comments/8k8qhr/introduction_to_vrfs_with_vrflite/

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4 comments

really cool!

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Original Poster2 points · 2 months ago

That's good to hear!

Original Poster2 points · 2 months ago

Thank you

Wondering about integrating dynamic routing with VRF's?

In this video, we configure OSPF, EIGRP, and BGP in a VRF environment.

https://youtu.be/7RtoNTK-mgE

Downloadable configs if you want to lab it yourself.

u/mark_3094
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