1 00:00:04,600 --> 00:00:06,420 Welcome back everyone. 2 00:00:06,430 --> 00:00:13,360 Now we're going into a full fledged Internet layer protocol or or and network access. 3 00:00:13,390 --> 00:00:13,940 Right. 4 00:00:15,920 --> 00:00:17,700 The IP protocol. 5 00:00:18,060 --> 00:00:18,620 All right. 6 00:00:18,890 --> 00:00:23,240 Consider this a connection less routing for recall. 7 00:00:23,290 --> 00:00:25,840 There's two main reasons for this particular protocol. 8 00:00:25,910 --> 00:00:34,350 OK routing one and providing a single network interface of the Aubert layers. 9 00:00:34,460 --> 00:00:41,360 It can talk to the other leaders why without this layer application programmers would need imagine this 10 00:00:41,540 --> 00:00:49,890 would need to write what's called hooks into every one of their applications Rej different access Oracle 11 00:00:51,380 --> 00:00:52,140 owl. 12 00:00:52,460 --> 00:00:56,120 So you're trying to do anything to get to any other protocol. 13 00:00:56,170 --> 00:01:00,870 There's other I we were just talking about and this guy I.P didn't exist. 14 00:01:00,870 --> 00:01:03,650 You need to actually buy it somehow. 15 00:01:03,810 --> 00:01:04,320 OK. 16 00:01:04,350 --> 00:01:06,850 So it's ok. 17 00:01:07,140 --> 00:01:09,760 IP provides on a single network interface. 18 00:01:09,840 --> 00:01:18,580 The oberlé are portable that says they turn on the IP protocol IP for an IP address it's on them. 19 00:01:18,600 --> 00:01:20,070 We'll be talking about that. 20 00:01:20,310 --> 00:01:22,830 We'll we're talking about that. 21 00:01:23,610 --> 00:01:33,430 And while things are running in with this protocol obviously IP ICMP we all know that if you don't use 22 00:01:33,430 --> 00:01:37,090 the protocol that we use when we paying OK. 23 00:01:37,360 --> 00:01:39,340 Now why do we pay. 24 00:01:39,820 --> 00:01:43,720 Funny story I guess one ground use for it. 25 00:01:43,750 --> 00:01:56,410 But how does one student one time tell me yes I may I make sure that all Linux Unix servers have communication. 26 00:01:56,480 --> 00:01:57,200 I'm on one. 27 00:01:57,200 --> 00:01:57,770 How do you do that. 28 00:01:57,780 --> 00:02:00,520 Well I'll make sure that information get across. 29 00:02:00,590 --> 00:02:03,870 OK when you do that how do you get. 30 00:02:04,010 --> 00:02:08,180 How do you know that communications getting across what you use. 31 00:02:08,180 --> 00:02:12,580 What software application what me although I paid. 32 00:02:12,760 --> 00:02:18,100 And I said Olson paying for a I shouldn't have said that but I would say OK. 33 00:02:18,230 --> 00:02:24,650 But yes pinging is ICMP and that lets you know hey he's alive. 34 00:02:24,870 --> 00:02:33,450 I mean any and you can pay somebody great you have connectivity to it might not be able to get to a 35 00:02:33,460 --> 00:02:33,970 share. 36 00:02:34,000 --> 00:02:37,630 Why not be able to resolve host name not be able to do many other things. 37 00:02:37,900 --> 00:02:43,390 Ok so I you are going to do any we or one out now only to see if there is any other problems we need 38 00:02:43,390 --> 00:02:44,330 to get into that. 39 00:02:44,590 --> 00:02:50,630 And are they all is this an APB for our address resolution protocol. 40 00:02:50,680 --> 00:02:52,560 There's no reverse or are going. 41 00:02:53,050 --> 00:02:55,080 Well there is but more about it. 42 00:02:55,180 --> 00:02:55,720 OK. 43 00:02:55,780 --> 00:02:57,750 Adverse resolution protocol. 44 00:02:57,750 --> 00:02:58,180 All right. 45 00:02:58,210 --> 00:03:01,680 This is exactly what happened the first time. 46 00:03:01,700 --> 00:03:05,210 You all should know this or you better know this. 47 00:03:05,360 --> 00:03:06,800 I want to tell you now we don't. 48 00:03:06,970 --> 00:03:07,670 OK. 49 00:03:07,870 --> 00:03:19,200 Well first time that you tried to get anywhere OK it's within your own network there's going to be an 50 00:03:19,320 --> 00:03:21,870 art request sent out. 51 00:03:21,870 --> 00:03:22,520 Right. 52 00:03:22,560 --> 00:03:27,310 The switch is going to say oh my god i have our broadcast coming towards me. 53 00:03:28,280 --> 00:03:32,240 Who is that MAC address and puts it in his sport. 54 00:03:32,370 --> 00:03:34,000 I have a destination. 55 00:03:34,250 --> 00:03:35,470 Well I don't know the MAC address. 56 00:03:35,630 --> 00:03:43,190 Hey everybody who is the owner of this IP I can you get the backorders what's in an upward. 57 00:03:43,220 --> 00:03:44,910 It was in the same segment right. 58 00:03:44,990 --> 00:03:49,970 And then now you have these two MAC addresses on either Portuguese. 59 00:03:49,990 --> 00:03:56,450 Let's go back and forth anymore our broadcast with a special type of broadcasts. 60 00:03:56,450 --> 00:03:57,180 Right. 61 00:03:57,200 --> 00:03:59,240 It was trying to get outside your network. 62 00:03:59,800 --> 00:04:03,530 Are you all with a router you know to send an R to the router. 63 00:04:03,750 --> 00:04:07,840 The routers want the interface that you're connected to that need your MAC address. 64 00:04:08,990 --> 00:04:11,730 Oh OK let me give it to you. 65 00:04:11,720 --> 00:04:12,920 I got it. 66 00:04:12,980 --> 00:04:13,970 I had the Agadir. 67 00:04:14,480 --> 00:04:15,570 I completed it. 68 00:04:15,710 --> 00:04:16,820 I now know my. 69 00:04:16,850 --> 00:04:18,220 I know my IP. 70 00:04:18,230 --> 00:04:20,770 I know that I know my math. 71 00:04:20,930 --> 00:04:23,500 I know my defog that way. 72 00:04:23,690 --> 00:04:24,980 I know the destination. 73 00:04:25,010 --> 00:04:26,140 Don't want to go to. 74 00:04:26,150 --> 00:04:26,750 OK. 75 00:04:26,900 --> 00:04:30,430 Ivy or name where will I be. 76 00:04:30,480 --> 00:04:31,060 All right. 77 00:04:31,070 --> 00:04:32,880 But I don't have the destination MAC. 78 00:04:33,020 --> 00:04:34,590 That's why I need to do an arm. 79 00:04:34,800 --> 00:04:36,250 I can have it. 80 00:04:36,380 --> 00:04:37,260 So that is important. 81 00:04:37,260 --> 00:04:38,340 Art is important. 82 00:04:38,480 --> 00:04:43,800 It existed that before I say does not exist do not block it. 83 00:04:44,890 --> 00:04:51,800 Would you block ICMP V-6 you run into issues that simply B-6 or. 84 00:04:52,000 --> 00:04:55,120 Is the one it has a heck of a job. 85 00:04:55,120 --> 00:05:01,820 The girls and I and IPV say we have neighbors solicitations Mayberg knowledge minutes Laura's hallucinations 86 00:05:01,850 --> 00:05:03,100 rodder acknowledgement. 87 00:05:03,310 --> 00:05:08,510 We have had up to address the Taschen OK. 88 00:05:08,880 --> 00:05:14,230 If you block ICMP there goes IPV says don't do it. 89 00:05:14,350 --> 00:05:15,100 All right. 90 00:05:15,250 --> 00:05:20,870 Anyway so this is what the protocols are run within the IP protocol. 91 00:05:20,900 --> 00:05:26,990 I prefer not to understand that IP looks at each packet address then using a roundtable all. 92 00:05:27,350 --> 00:05:32,420 Now we're getting into some fun stuff or writing table inside where a packet is to be sent next choosing 93 00:05:32,420 --> 00:05:35,130 the best sended upon. 94 00:05:35,180 --> 00:05:37,840 How is our writing table made. 95 00:05:38,110 --> 00:05:38,760 OK. 96 00:05:38,880 --> 00:05:47,090 Going That's not to say I PVC's segments from the host player and fragments them into datagrams necessary 97 00:05:47,120 --> 00:05:50,710 i.p then reassemble undergrounds back into segments on the receiving side. 98 00:05:50,750 --> 00:05:58,190 Remember sequencing when doing we really back together was assigned the IP address of the sender and 99 00:05:58,190 --> 00:05:59,480 that of the recipient. 100 00:05:59,480 --> 00:06:04,240 The right decision is based on the Pagar destination or is based on this and they should rest obviously. 101 00:06:04,370 --> 00:06:06,110 OK. 102 00:06:07,000 --> 00:06:08,070 Or this writing. 103 00:06:09,060 --> 00:06:10,690 Things based on routing thing. 104 00:06:11,030 --> 00:06:11,850 OK. 105 00:06:12,150 --> 00:06:16,620 Well that means you know you better know 100 hour how are you writing or using the four hours or using 106 00:06:16,620 --> 00:06:19,110 static routes are using our routing particle. 107 00:06:19,120 --> 00:06:25,270 So just rip on that rivers and obviously please reversion to revenge. 108 00:06:25,550 --> 00:06:31,760 By far I believe six were using the European or European or version 6 or using OSPF or SPia Burgundy 109 00:06:31,800 --> 00:06:38,050 are using I asked are we using BGP be. 110 00:06:38,190 --> 00:06:39,210 Where are we using. 111 00:06:39,530 --> 00:06:40,070 OK. 112 00:06:40,180 --> 00:06:42,480 Sabata wrong Pericles or we want to use. 113 00:06:42,570 --> 00:06:43,220 OK. 114 00:06:43,320 --> 00:06:50,860 So the painting apparently on around the corner call is depending on that type of writing table and 115 00:06:50,870 --> 00:06:55,380 depending on the algorithm when there are a protocol in which way it's going to send it. 116 00:06:55,570 --> 00:07:02,420 So that's why I say this is a four letter OK because when everything gets there as you go around it 117 00:07:03,050 --> 00:07:04,130 you don't have to talk to. 118 00:07:04,160 --> 00:07:06,970 I mean you want to lead your network don't you. 119 00:07:07,130 --> 00:07:08,570 You want to stay home all the time. 120 00:07:08,630 --> 00:07:10,480 You want to venture out there right. 121 00:07:10,490 --> 00:07:12,460 You want some packets across the world. 122 00:07:12,650 --> 00:07:16,600 So routing very important 123 00:07:20,670 --> 00:07:25,960 order calls the ICMP really says one. 124 00:07:26,020 --> 00:07:27,430 It's not a real protocol. 125 00:07:27,470 --> 00:07:30,750 Number one is a request or a reply. 126 00:07:31,040 --> 00:07:37,390 Ok yeah I've been I've e-tolling that's for TZP a six unit UniFi 17 is European. 127 00:07:37,470 --> 00:07:39,330 Eighty eight or 89. 128 00:07:39,330 --> 00:07:44,160 These are again Kurkov for recall numbers. 129 00:07:44,250 --> 00:07:50,010 Now port numbers protocol numbers what they did was they like wireshark. 130 00:07:50,140 --> 00:07:51,370 Usually something like this. 131 00:07:51,470 --> 00:07:52,030 OK. 132 00:07:52,260 --> 00:07:58,630 Or SPF 89 EPB 6:41 you're a 47 and Lehre tutorial to T-P is 115. 133 00:07:58,680 --> 00:08:00,880 Any kind of security that you're doing in there. 134 00:08:00,930 --> 00:08:02,110 Again should you know this. 135 00:08:02,200 --> 00:08:02,410 Yeah. 136 00:08:02,430 --> 00:08:03,160 OK. 137 00:08:03,430 --> 00:08:04,000 Yeah you should. 138 00:08:04,030 --> 00:08:06,660 You learn the basics. 139 00:08:06,830 --> 00:08:09,350 But you know TZP UDP Europea your multi. 140 00:08:09,470 --> 00:08:15,820 You're writing protocols the nature Ah but understand that these are protocol numbers. 141 00:08:16,120 --> 00:08:18,570 And it's very important really to me. 142 00:08:18,900 --> 00:08:19,390 Yes. 143 00:08:19,410 --> 00:08:28,690 When we were looking as some sort of network analysis tool or I said all optical are 88 What have you. 144 00:08:29,060 --> 00:08:31,430 OK we're working with this particular route. 145 00:08:31,460 --> 00:08:35,330 We know we're running for global warming with be configured all day. 146 00:08:35,520 --> 00:08:41,180 So you know what it's going to say or be everywheres going to say whatever or yeah you ropy say whatever. 147 00:08:41,370 --> 00:08:47,840 OK so again these are just protocols with their numbers that work. 148 00:08:47,880 --> 00:08:48,920 And this particular earlier. 149 00:08:48,930 --> 00:08:57,340 But the important thing to remember the Internet layer IP protocol is connection less. 150 00:08:57,600 --> 00:09:03,250 This is where the routing is the meat and potatoes right here. 151 00:09:03,270 --> 00:09:08,610 Routeing riggings where import emetics.