Special IP Addresses

10 minutes
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All right, welcome back, everyone. Now that you know what an IP address looks like, how big is it? How I separated the logical IP address, right? Well, then those IP addresses, their special IPS, right IP addresses that we don't assign. So which addresses are we talking about? So let's erase this up here.

Okay, let's get our handy dandy pencil back. And our favorite one, zero. Put a little.in there, zero, not not in there. And then one more is a little slow. So that obviously we know is our loopback loop. Back Address Okay, this address or the entire 127 address, you do not assign, you do not assign it, it could be 127 128 1.9 130 it could be 127 50 01 and can be whatever, anything that starts with 127 is your loopback address.

If you're asked on a certification test, whether it be your CCNA whether it be a network plus heck even a plus is asking stuff about IPS. This is your loopback address. What is it for to test to test te si p i. p. stack the services okay not to check your Nic card. This is to check to see if that particular protocol is actually up and running fingernail Are you putting your IP address that you put in there or your logical address, but that's what that's for. So we do not apply this to any interface on a router switch and device, we do not use this address, it is reserved, it is reserved for loopback resolving to check this particular suite of protocols, making sure that is up and running. If you don't get a reply from your loopback address and you ping it, right because you're gonna go ping 127 001 or pain space loopback then if you get request timeout unreachable some crazy stuff like that, then there's something wrong with your TCP IP stack.

You may have to on install or reinstall it, you might, you know, restart the service of the TCP IP. But that's it. Okay, that's what it's for. Now, we have some more. Okay, let's take a look at another one. Who is also a good one, our favorite one right?

This is one of the first things you need to check when somebody says hell not receiving an IP address. I don't have an IP or I can get on the network. Or he doesn't know because he can't get to a command prompt. I can't get on the network. I don't know I can't get anywhere. I don't share folders.

I can print I can get online. Right? You go to a command prompt, you do an IP config. Right? And you see this. The dog wants the canine to move before the.in there online whenever the decimal and I want to put access because there really could be any number here.

It doesn't really matter. It can be any number right there. Okay, if you see these two right here, that's NRP PL, O P. Ai, automatic private IP address. All people window says or whatever. He didn't put one static address. He didn't put a static address in there.

Okay. He must be DHCP right. The CPUs are using Dress what the SEC is not giving us an address as well, we're gonna go ahead and give ourselves one. All right, and it puts it somewhere in that range. So you can do that. We want to have your lazy, you know, do your job, you can go ahead and network in one particular segment with this, but you have no control over what IP addresses are being assigned.

So don't do that. I've been asked the question, can we just network with you people, you know, just let it go. You don't have an IP address. And then don't be in the networking business. Okay. Don't don't don't be a network engineer.

If you're going to rely on this, I mean, seriously, the only time the only time I ever saw is and this was many moons ago, was in a wireless or an OCO router that their default IP address to connect to it was a 116 or 24 something something I don't remember what it was. And you actually then connect to it and do your configurations and what have you. They have a for security purposes because nobody would think, hey, what IP address are they using? You know, they're not Oh, they must be using People know. All right, so that's another reserved address. You don't use it it is non routable.

Non routable. Okay, I'm saying it loud and clear. So you can understand it is non routable. So that's another reserve address that we do not use. All right, let's erase that. What's another one?

What's a no 000. And then one more zero. All right. We use this as a universal gateway. Okay, for default routes. This is not used.

It is also reserved. I mean, there's a million reserved a million I exaggerate. There's a whole bunch of reserved IP addresses. All you got to do is look all those RFCs go up there, check them out, and see Hey, what are the reserved IP addresses is another address that is reserved that we do not use. We do not use we can't assign it to anything. The only time we use something like this all zeros because they zeros really mean match exactly our in the IP addressing overcharge, we walk our mask, which we'll talk about later on.

Okay, we do default routes with it, right? We all do something like IP route and we'll do 0000 there's a decimal in there somewhere in between each one. See, we got it more or less. Okay, and then you know, instead of zeros Okay, let's see what comes up. Whoo, magic, it comes up. Okay.

I kind of missed that in between there. All right. But anyway, this is what's called the far out. So this is what you use this for. Okay? But again, it's reserved, it is reserved do not assign this to any Alright, if you're doing this because you're routing purposes and doing a default route, so you're writing those drop packets, okay?

But again, you will not, you will not use this. Alright, so you got the 169, you got to give people you got to do loopback address, and you have this default route, address universal address that is also reserved, but you can look, look to Hey, hey, Google, OK, Google. What are the reserved IP addresses? Maybe he'll tell you, or she'll tell you, whatever the case may be. All right. So, these are special addresses.

These are addresses that we will not assign I for those particular purposes. Well, they go off and as you from some crazy reserved addresses, there are other reserved addresses, okay, when no more not more important, but when you finally get your routing protocols, I like two to four I put the decimal later to do 400 0939 Okay. I see we got it. Yeah. Good. All right.

That is a multicast address for rip. So run rip sends updates is going to use that particular dress. You don't assign that. Okay? So multicast address what you'll learn shortly why that's multicast. Okay, another 1224005 or six.

That's a new way of doing it. I like that. All right, this is for OSPF they can use one or the other. Why? Because when we're doing Dr. BDR elections, right and OSPF they'll use one or the other one goes to the r1 goes to everybody else. All right, and it's a Two to 400.

Okay, that's the eigrp. So these are multicast addresses that routing protocols use. Right alpha here are so you know it's rip. I'll put here old for OSPF and I'll put here d for Ei GRP. Alright. So now you know these are multicast addresses where they send their updates out on.

Okay, multicast. So these are again, you wouldn't assign these because they're used, you won't be allowed to assign any multicast addresses anyway. But regardless, when you're doing a, you're configuring a router, don't assign these addresses because these are reserved for sending updates. So within the realm of those 4.2 billion addresses Okay, we have certain addresses that are reserved for special purposes, whether you're an ipv4, which you need to learn, and an ipv6 as well, okay, that's another course altogether. Okay. All right.

That's it. Those are your special IP addresses. I'll see you in the next

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