Time
2 hours 8 minutes
Difficulty
Intermediate
CEU/CPE
2

Video Transcription

00:01
Hello and welcome to Sabres Infrastructure Services today. We're gonna be looking at our our cash. I'm your instructor training Darrow.
00:10
And let's get into it. Today you're gonna be looking at the commit AARP and its usage. We're gonna utilize the AARP to determine what's our layer layer layer to layer three mapping czar on our device.
00:20
And we're gonna quickly take a look at a art message on wire shark.
00:26
So are what it does. Is the address resolution protocol. Right, It. So here we're gonna read or write off displays and modifies the I p physical address. Translation tables used by address resolution protocol or AARP. Right. So it's the i p the I p. Before, I could be six map ings to a
00:45
a Mac address, right?
00:48
I'm just in case you are curious. Yeah. You concede at the bottom you can add a static entry.
00:54
Um, I've had hit or miss luck with it. Just be weary of that. I tried to be a before and had had issues.
01:00
Um, there's not a whole lot of difference in this between window Senator Boone to
01:04
just be weary that sometimes you do gotta use the dash dash help just to quickly do a reference. I use it all the time in which almost any time I use a command and I'm not too familiar with.
01:18
So let's go ahead and bring up the windows box.
01:21
So you got here. Let's do a seamless make sure we could. Paying 19 to 1 60 year 50.
01:29
So here. We're still paying
01:30
a must do a
01:34
carpet dish. A
01:37
So here. We're gonna find our dress here.
01:41
So disregard the 2 to 4 in the to 39 right? Those air. Your multicast address
01:48
Here. We can see the Mac address off
01:53
our gateway, right?
01:56
Pretty simple. That is gonna be thesis, Kal Gateway
01:59
device.
02:01
All right, so I'm gonna go ahead and bring up the
02:06
Boudou box. We're gonna go ahead and enter a few times when clear,
02:10
you must do. They are a We'll see what we come up with. All right. So do anything we have on there currently is. Our gateway device
02:21
is a 10 121
02:23
10 1 to that one
02:24
on again is the
02:29
as the Cisco router. Right?
02:31
So that's what we're showing right now. So because we only have these device Southern land this Onley layer two devices. It is showing us currently
02:39
so. But maybe we can't do a ping to I set up a veal and address
02:46
so
02:47
can actually hit that one.
02:51
And let's do an art dish a again and see if we show that villa and I p address now.
02:57
All right, there we see it there. It's not So what is trying to do? Why the limits one has taken so long is because it's trying to resolve the host name right?
03:08
So here we do see that it did map thievy lying to
03:15
for the V Line I p address.
03:16
So if we do A our pedestrians hope we might be able to find a way to just do the name Eric. So here, if we set the desh and flabby,
03:25
so if we do A N comes to immediately doesn't even try and resolve it. Therefore, we no longer have to wait. Sometimes using dash dash help will save you a little bit of time
03:36
on a little bit of frustration, right?
03:38
There's nothing worse than getting a middle of troubleshooting and sitting there having to wait five seconds for it aren't able to come back,
03:44
all right?
03:46
And it's the same thing with the windows box. If we do a ping to the 172
03:53
16 1 to address, which is the switch V lineup I p address
03:58
or should be.
04:00
There we go. 1st 1 signed up because it should be harping
04:03
so control. See, it
04:06
must do a Harvey. Hey!
04:10
And you should see the Where is it? Sorry.
04:15
Right here. We have both of them sets and you see that the type is dynamic, whereas the multicast address
04:24
and they broadcast address is said to static.
04:27
Do you see the static or the broadcast? It has the physical manc of all laughs because it's Hexi Decimal
04:33
and has the broadcast i p. Address for the sub net
04:38
and we will get on with it. This is a short lesson. So let's go ahead and take a look at the B caps.
04:46
Bring on Windows 10
04:47
started. Worry, shark.
04:53
We will grab either nuts.
04:56
And let's I'm gonna bring this down here since we're not looking at it.
05:01
Start this up.
05:03
I must do Was clear are here
05:08
on. I can't remember the command for it. So Let's take a look.
05:14
Do. So I'm gonna go ahead and do our D
05:18
17 to 16 1 that one.
05:23
And we need elevated privileges.
05:29
So what I'm gonna do
05:30
soon D
05:32
right Click run his admin
05:36
Do they are, Dashti 0.7 to 16 1 that one and must do one of two as well, right?
05:46
So now yeah, we see it already trying to our about. It's already trying to grab it.
05:51
So what we're going to see here? I'm gonna leave this, so if you do it ping 1 70 16 because it's trying to ping or try to grab that gateway. So we should immediately resolve pings here, right?
06:03
You're seeing the ICMP come through. But what happens? What we're gonna see first if we do a dot to
06:12
So you see that one as well? So you see the of initial AARP, right? So it's no, no, cancel. Let's stop it. Let's take a look. So here you see the initial ARB looks out and says, Hey, who has the one dot to address?
06:24
Cisco Switch comes back, says Hey, I got it right here. And then it continues on with the ICMP
06:30
request replies. Right.
06:34
So I like
06:35
sometimes going through this kind of fun. You actually solve a lot of networking problems of wear, shark
06:42
and quiz here. I know. Hopefully you saw it. I'm gonna let you do a little bit of research on your own here, especially have cmd access. What is the art command flag that will set a static entry? Should not
06:56
be too hard.
07:00
All right, If you guessed Dash s, you would be correct.
07:08
And in this video today, we discussed the command, AARP and its usage. We looked at the where the peak caps over the our command,
07:18
and we went through and actually deleted
07:21
the AARP as well
07:24
as always. I hope you enjoyed the lesson today, and I look forward to seeing you in the next one.

Up Next

Infrastructure Services

This Intermediate networking course will look at some of the more advanced tasks required to maintain a network. We will cover network tunneling, upgrading Cisco IOS to fix patches so we can avoid exploits, and other network troubleshooting tasks.

Instructed By

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Trenton Darrow
Network Engineer at NCI Information Systems, Inc
Instructor