Time
13 hours 57 minutes
Difficulty
Beginner
CEU/CPE
14

Video Transcription

00:00
Hello and welcome back to Ice. Indy one. Interconnecting Cisco Networking devices apart one. This is absolute. 632 network address translation concepts I'm treading. There will now be a structure for this course
00:12
Unless we don't. We went over the lesson 6.3 overview ended a few pre assessment questions in itself. Sort of recovered. What? Nat is why we use it. And we're looking a few different types of gnats.
00:24
The 1st 1 we were the Nat Concepts. And then we will be going over each type a little bit. It would look static, net dynamic net. And finally, we will look at Pat or port address Translation.
00:36
But first, a quick, pretty system here. Which of these I p addresses would be in our f c 1918 Hopefully. Remember this one.
00:48
All right is 10. 23 59 22. Remember, 10 0 does your zero slash eight
00:56
is in our C 1918 being a private address, and we'll go over that again here in a minute.
01:03
All right, So what? We used that
01:03
the ai ai ai the Internets sign it numbers authority. It pushed out the last slash eight block of eye peas to the i. R i. R i. R. The regional Internet registry in 2011 meaning that it had
01:22
always blocks and had pushed out the last one.
01:25
Um And then there we have the
01:29
Asia our I r ran out to those 11 Europe ran out 12 Latin American, Caribbean right out 14. The North America just ran out 2015 and Ferg, I just ran out in 2017. Now I still have the small pools that are reserved for the
01:48
net
01:49
changeover for every B six. If you see on the graph, you'll see a lot of don't actually hit very bottom. They
01:56
stay right above because we have that reserve pool for I p b six.
02:00
So if you guys don't know, we are.
02:02
I mean, the I pee before is exhausted. Rose, I was telling the wife about this and I was so excited to finally bring it. I could be six and like, you know, the changes that are happening is really cool. And she walked out of the room. She so hopefully you guys find it exciting
02:20
because this this I mean, it has been a problem since the late eighties. Early nineties.
02:27
Um,
02:28
really, since I've been using the internet,
02:30
So what are solutions? We have i p v six. Their long term. That is gonna be our changeover we have. You know, we're looking at a 32 bit address of I P four verses, 100 28 bids address of I B B six. And if you're curious, look up the amount of addresses and i p v six it is
02:49
and absolutely astounding number. Someone ran a thing saying it is something like each each cubic inch on the earth would be able to have an I. P address. It was just something just so crazy like that.
03:00
Um
03:02
anyway, so the short term solutions is cider.
03:07
So cider. What that does remember that is your It allows us to sub net networks. It also was for route summaries ation, which is kind of unrelated to epic the shortage issue. It's just the benefit because let's say a r i r gives a
03:23
slash eight block to one. I s p right.
03:27
Instead of having a huge routing table saying, you know, 10 that one tends to attend that three dates and you know, these huge routing tables, he could just say, OK, the entire $10 block is right here anyway. But so what center does is it allows the ice piece to use
03:46
variable like some netting,
03:47
So meaning they could actually properly sub that a network and use the space efficiently.
03:54
So we have private addresses, which is R. C 1918 which hopefully you guys should know. By now, we've gone over a bunch of times.
04:02
So what these do? These are non reputable addresses on the Internet. Meaning there on your local area networks.
04:10
Um, you know, 1 91 68 that Wanda zero sexually foremost home networks. 1 17 16 through 1 70 31 to 35 to 35 on your 10 dot network.
04:23
Um,
04:25
these are wonderful, because,
04:27
I mean, everybody's home network has 1 91 succeed that one, that one. But we all have different pees on the actual Internet,
04:34
meaning we can have, you know, 20 devices on one network using one i p address.
04:41
And the way we do that is within that is right.
04:45
So what matter? Static dynamic and then not overload. So we'll go with the different types here in just a second.
04:51
Um, but when that does here
04:54
is it changes your I p address. Right. So let's say you have this internal address right here,
05:01
and he wants to go communicate to this far server over here.
05:06
So when it hits, this server right here
05:10
is gonna put the I P addresses this. Let's say that's just aesthetically assigned for a one on one. With this one. He's gonna go over here going to communicate, and then what comes back, he's gonna come in here and say, OK, this isn't destined for me. This is destined for this mapping of this address.
05:27
Order this computer.
05:30
So it's just a way of taking that public or that private i p address mapping it to a public address. So that way
05:36
it can talk on the Internet, can route that essentially one road, that private address on the Internet without anyone else knowing the private address.
05:45
So standing, that is, is ah, it's an exact 1 to 1 mapping of internal to private I P addresses.
05:53
Right. So this one doesn't save a whole lot on like the I p V for exhaustion issue.
05:58
Um, because you're still using Exactly, You know,
06:03
right here using one i p for each one each one inside local is different than your inside global. So think of these. This is gonna be your global or you're inside global here
06:16
And these were going to your local
06:19
So the one that's actually raw audible on the internet is gonna be your global address. Is these inside?
06:26
These refer to
06:28
over here on your side of the internet,
06:30
Um, the you'll see if you sticking up for I see me too. You'll see.
06:35
But these ones are.
06:40
So if we look at those, that's exactly one of one. So think of the public eye P is your insight global would private I p is your inside local and it's a 1 to 1 mapping.
06:48
I'm addresses.
06:50
So we get into dynamic night here and we start saving a little bit more. I p addresses because we say we have that same pool. Public addresses. We have three public addresses.
07:00
Um,
07:02
but
07:03
we dynamically assigned them, right? So let's say only dot fifties on the network right now.
07:09
Um, we're only using when I p address. I realize we have three allocated for us still, but we're only using one.
07:16
Um, and let's say you know, then we have that 51 comes on. He's like, Okay, I would use this one. And let's say 10.50 goes off the internet. He goes home for the day, and we're gonna have got 52. Come on here and use this I p
07:30
So really, we're using too, but we still have three allocated.
07:33
So you're thinking OK, so why does this say space?
07:36
So let's say we have 30 employees. We are a 24 hour shop. Yes, we have 10 employees every eight hours.
07:46
Right.
07:48
So if we think about it, we could ***. We could go down here to Ah.
07:54
Well, let's just say that 100. We had 10 addresses, I'd be a little more, but,
07:59
um, well, see, we only have 10 addresses, so every eight hours were essentially gonna be replacing those 10 computers
08:05
where 10 new computers is what's gonna happen.
08:09
Um,
08:11
so really, we could have got 51 all the way through.
08:15
Say 0.80.
08:18
Well, the thing is, they're only going to use those 10 addresses because they're getting swapped out. So instead of having to allocate 30 I p addresses because you didn't need that 1 to 1 mapping aesthetic. We can now only have 10 because that's all the
08:31
We would only have 10 people on the network maximum at a time.
08:37
So here's where that states in space.
08:39
So when we finally get into the wonderfulness of Nat Overload and Pet, So this one is awesome because
08:46
we can use one i p address for multiple
08:50
her multiple devices.
08:54
I think the last time I average, like, 15 devices on my network and we all know work. You know, my TV has won my watch. You know, I just I was crazy if I haven't gotten into the microwave or the coffee pot or any of that stuff you have. But,
09:05
you know, I mean, everything's connected. Nowadays we have more and more devices that are gonna be on the network.
09:11
So here is where we start saving because, you know, let's say we go into
09:16
the way this works. Is it assigns a ports to it seemed every that source parts that we always see is some randomly generated number.
09:26
So now let's see, you know, the cool thing is Let's say that 50 you know, now he's on 64. 12 What's that? He's got a bunch of Web pages open
09:37
66 15 you know, just randomly generated ports. And then when it comes to back through, it goes on like this. So it's cool because we're gonna have multiple connections with the same thing. Different opened things. So I'm gonna go in
09:54
if we look at how does that say space? Okay, so let's say we have 51 here,
10:01
52
10:03
and he's in 32. 123 again and 55 1 20 Just arbitrary numbers. Um,
10:13
then these
10:13
we're going to hear, even though they correspond to difference inside local addresses. It's gonna be that same inside global address, but with different ports
10:26
rights. When it comes back in, it's going to say, OK, I recognize this port is going to him.
10:31
Mystery would. That means when you get into the Nats Overload Lab well, actually going and we'll see those port numbers. That's kind of cool. So if you remember the sockets that we did on with you could show, did you run it like a Net stat command on your Windows machine or Lennox?
10:48
Um, how it has that source address that source port the destination I peed a destination port.
10:54
Um, that source pour is like this one, right? So it has that connection that says, Okay, when it comes in on this port, this, you know, randomly generate source pork. It's for this thing.
11:05
It's the same idea,
11:09
right?
11:09
So bring us into the post assessment here. What is the private I P address called on the source land for Nat. Give me a few seconds.
11:22
All right. Hopefully you got inside local where the inside global is that kind of like that public i p that the inside local is translated into
11:33
and in accepts older and look at the static and dynamic Nat configuration. So get ready to break out those routers and switches again, and we'll get going.
11:41
And it was if you guys have questions, need help. Feel free to shoot the message. All right. Thank you for watching this course for to see in the next one

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