1
00:00:00,270 --> 00:00:06,640
So is dynamic not once again you are creating a pool of inside global traces.

2
00:00:06,810 --> 00:00:13,980
The reason why it's called dynamic rather than static is the rodded dynamically allocates IP addresses

3
00:00:14,070 --> 00:00:18,090
from the pool on a as needed basis.

4
00:00:18,090 --> 00:00:21,650
The mapping will be removed once communication ends.

5
00:00:21,750 --> 00:00:28,980
So there's no permanent one to one mapping that's always wé like you have with static Nat with dynamic

6
00:00:28,980 --> 00:00:36,470
nat the net translations are automatically created when they needed and torn down or removed to were

7
00:00:36,460 --> 00:00:37,520
not needed.

8
00:00:40,040 --> 00:00:45,980
Now as I've been explaining typically static Nat is used when you have servers so a way road one is

9
00:00:45,980 --> 00:00:51,770
a serve as an example that needs to be accessible from the outside or Internet not just to make sure

10
00:00:51,770 --> 00:00:53,750
that we cover the topics in the CCMA.

11
00:00:53,900 --> 00:01:01,640
I want to show you that Rato one is able to ping router three when static net has been configured on

12
00:01:01,640 --> 00:01:02,730
Raiatea.

13
00:01:03,290 --> 00:01:07,820
So show run piping clewed that we can see the static NAT translation here.

14
00:01:08,240 --> 00:01:16,130
So we are translating 10 1 1 1 2 8 1 1 5 show IP net to translations.

15
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Notice there is our static NAT translation.

16
00:01:19,280 --> 00:01:26,250
We are not netting the outside local and outside global in the static Nat let's do a debug.

17
00:01:26,360 --> 00:01:36,900
So debug IP Nat and what I'll do now is our telnet to 8 1 1 2 the telnet connection is disconnected

18
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because I need a password on the site.

19
00:01:39,780 --> 00:01:49,030
But what I'd like you to see is the source IP address 10 1 1 1 was not 2 2 8 1 1 5.

20
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That's the inside global address.

21
00:01:52,680 --> 00:01:57,600
The destination of the traffic is 8 1 1 2.

22
00:01:57,680 --> 00:02:08,210
We had a reply back from 8 1 1 2 2 destination 8 1 1 5 which is then translated to 10 1 1 1 so traffic

23
00:02:08,210 --> 00:02:15,770
from a 1 to 3 is having the source address translated and then the return traffic has the destination

24
00:02:15,770 --> 00:02:18,280
address translated.

25
00:02:18,410 --> 00:02:25,390
We are doing source address translation of this IP address all enable telnet on the site.

26
00:02:25,440 --> 00:02:30,140
So they enable the V T1 lines on this router

27
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and enable a enable password.

28
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So we still running a debug show debug shows me that debugging is enabled and old telnet from wrote

29
00:02:47,040 --> 00:02:48,840
a one to rotisserie again.

30
00:02:52,670 --> 00:02:58,410
You can see the net translations taking place again source to destination.

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I'll log in

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and let's end to one character.

33
00:03:06,080 --> 00:03:08,190
E.

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00:03:08,440 --> 00:03:15,490
You can see for the character e the source was translated from 10 1 1 1 2 8 1 1 5 going to a destination

35
00:03:15,490 --> 00:03:21,360
of 8 1 1 2 reply came back and some other traffic was returned.

36
00:03:21,440 --> 00:03:33,980
So an acknowledgement to rotisserie type an we get to the same kind of translation hit enter same kind

37
00:03:33,980 --> 00:03:36,050
of translation is taking place.

38
00:03:36,080 --> 00:03:43,700
So for every character that I'm into in the last session nocte translations are taking place with 10

39
00:03:43,700 --> 00:03:51,380
1 1 1 being translated to 8 1 1 5 for traffic going from inside to outside and then 8 1 1 5 is being

40
00:03:51,380 --> 00:03:56,250
translated back to 10 1 1 1 4 traffic from the outside to the inside.

41
00:03:58,400 --> 00:04:03,890
In this example we'll configure dynamic not in the typology we have to rodders route 1 and route a four

42
00:04:04,280 --> 00:04:06,370
that are on the inside.

43
00:04:06,430 --> 00:04:12,560
They are connected via a switch to Rodda 2 which is going to do the actual network address translation

44
00:04:13,150 --> 00:04:21,170
will configure dynamic not on Rodda to to allow both route 1 and route of 4 to access router 3 which

45
00:04:21,230 --> 00:04:24,610
in our lab is deemed to be the Internet.

46
00:04:24,830 --> 00:04:27,460
So the 8 network is on the outside.

47
00:04:27,560 --> 00:04:34,460
That is the internet 10 1 1 0 is our internal network with these three devices connected to each other

48
00:04:35,000 --> 00:04:42,320
via switch one later on I'll expand the typology to actually connect rotisserie to the Internet so that

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00:04:42,350 --> 00:04:46,330
Rotto one and radio 4 can connect to sites such as Google dot com.