1 00:00:10,140 --> 00:00:16,200 Go for the first example sort of example is saying that you have a mixed crowd. 2 00:00:16,700 --> 00:00:20,140 And on this market they cropped up on Ethan at five. 3 00:00:20,220 --> 00:00:25,770 The packet is coming to Ethan at five and is leaving also at five. 4 00:00:25,770 --> 00:00:33,240 So for example if you are making from your computer bank to the router than dipping going from a computer 5 00:00:33,290 --> 00:00:39,570 internet 5 and the reply is coming out from internet 5 or for example if you're making a connection 6 00:00:39,570 --> 00:00:42,920 via Winbox to the router so it's to internet 5. 7 00:00:42,930 --> 00:00:49,790 If you have a cable between it and a 5 on the router and then reply to you from me then at 5. 8 00:00:50,010 --> 00:00:56,760 OK so now we need to see how the package is going to be flow if it's going from Ethan at 5:00 today. 9 00:00:56,790 --> 00:01:01,290 And it's not 5 to less to follow the the picture. 10 00:01:01,350 --> 00:01:06,300 So first it arrived to it and at 5:00 it's in a physical interface. 11 00:01:06,330 --> 00:01:11,780 It comes here and they say is it in that five part of the bridge. 12 00:01:12,330 --> 00:01:15,040 And we see here there is no bridge so it will say no. 13 00:01:15,090 --> 00:01:23,250 Then the packet will continue its way and it goes to here then it is that IP packet IP packet is normally 14 00:01:23,250 --> 00:01:26,210 when you are going from one IP to another IP. 15 00:01:26,220 --> 00:01:28,910 In our case yes it is an IP traffic. 16 00:01:29,430 --> 00:01:37,860 Then if we go to the the process of the routing and here it goes to the other end here what you can 17 00:01:37,860 --> 00:01:45,150 do when you know that that is inside the green routing then you can go to the the chain and then you 18 00:01:45,150 --> 00:01:48,500 can see OK on the what I can do here. 19 00:01:48,850 --> 00:01:49,300 OK. 20 00:01:49,320 --> 00:01:52,790 And then you can check what you can do on the pre-rock. 21 00:01:52,890 --> 00:01:56,080 But let's not follow the example. 22 00:01:56,730 --> 00:02:01,800 So it goes to rerouting and then from pre-loading it goes to the routing decision then the routing decision 23 00:02:01,800 --> 00:02:08,090 would say are you going to another port or you are going to stay simple. 24 00:02:08,160 --> 00:02:13,770 That means you are forwarding the packet somewhere or you are going to the router itself. 25 00:02:14,130 --> 00:02:22,050 In my case we said that its going to the out the because thats it being routed or Winbox then it has 26 00:02:22,050 --> 00:02:23,510 to go to the impled. 27 00:02:23,520 --> 00:02:25,370 Then again we are an input channel. 28 00:02:25,380 --> 00:02:31,270 You can see what you can do in email if we go back here or less three and then and then we'll chat. 29 00:02:31,320 --> 00:02:37,890 What I can do for example I can make the rule here on the booth and say I want to drop any pings to 30 00:02:37,890 --> 00:02:41,690 my router and thats when you can do with that's different. 31 00:02:42,120 --> 00:02:43,950 Let's continue the example. 32 00:02:44,100 --> 00:02:51,810 So here when it goes to the input then it will forward it here up that it would go to the local process 33 00:02:52,450 --> 00:02:53,990 and the local process as well. 34 00:02:53,990 --> 00:02:55,810 The process of the packet happens. 35 00:02:55,890 --> 00:03:02,100 That means if if there is a being that is in one box then all those traffic happen there then this packet 36 00:03:02,370 --> 00:03:06,350 is sent to that other process and then to the local out. 37 00:03:06,510 --> 00:03:14,300 And that it would go to the this box of IP version 4 or IP version 6 traffic. 38 00:03:14,610 --> 00:03:23,470 Then if it's yes or if it's not now in my case it is yes or it's an IP diversion for the to go here. 39 00:03:23,480 --> 00:03:26,460 Yes the decision to the output. 40 00:03:26,530 --> 00:03:34,380 Now also can do something on the output if you want to go to the post trouting it go down here and it 41 00:03:34,380 --> 00:03:41,820 will go to here it say this is the old interface is that the part of the Bridgeport here. 42 00:03:42,120 --> 00:03:45,050 We are not on a bridge that is no it's not part of the Bridgeport. 43 00:03:45,060 --> 00:03:52,050 So with go you know and here we go to the interface HTB that's where we can do the quality of service. 44 00:03:52,050 --> 00:03:57,820 And then as we go to the physical interface and if we go out from five again. 45 00:03:58,230 --> 00:04:03,580 So you can see this is the process when you want for example to make to the router. 46 00:04:03,600 --> 00:04:10,150 And when you want to make when most of the connectivity as an example packet going to the router. 47 00:04:10,430 --> 00:04:13,440 So it is the first example that I want to show you. 48 00:04:13,440 --> 00:04:15,010 Let's go now to the second example. 49 00:04:15,140 --> 00:04:18,770 The second example is saying OK we have the router here. 50 00:04:18,990 --> 00:04:22,810 So this is my router and all ports are inside a bridge. 51 00:04:22,920 --> 00:04:29,460 So I have all ports in a bridge and the packet is going to go from it and that's fine. 52 00:04:29,710 --> 00:04:32,090 Actually it's not why it has to go. 53 00:04:32,100 --> 00:04:38,610 It's either that one and then go outside at 5 and eat another one and eat another five. 54 00:04:38,610 --> 00:04:41,910 Both are inside the same bridge. 55 00:04:41,910 --> 00:04:46,400 So let's see how the package will flow that comes to the next one. 56 00:04:47,360 --> 00:04:50,300 And then it will say is it enough on part of the bridge. 57 00:04:50,300 --> 00:04:51,380 Yes it is. 58 00:04:51,380 --> 00:05:00,300 Then it will go to the rich box here and the bridge destination that it would go to the bridge decision 59 00:05:00,810 --> 00:05:08,790 the British decision saying are you going to airport inside the same bridge or you go into a port which 60 00:05:08,790 --> 00:05:10,730 is outside the bridge. 61 00:05:10,740 --> 00:05:17,550 So in my case we have to go into a vault inside the same bridge we go to it and I find that it will 62 00:05:17,550 --> 00:05:20,080 send it to the bridge forward. 63 00:05:20,220 --> 00:05:20,800 OK. 64 00:05:21,030 --> 00:05:24,660 When the port is inside the same bridge that has to go the bridge forward. 65 00:05:25,140 --> 00:05:34,410 Then as we go here to the bridge or stop then if we go down that goes here then it will go this way 66 00:05:35,080 --> 00:05:40,100 to here and that it will go out from Italy at fine. 67 00:05:40,590 --> 00:05:41,030 OK. 68 00:05:41,100 --> 00:05:46,190 So as soon as that didn't pass you can see it didn't touch the wrong box. 69 00:05:46,230 --> 00:05:49,270 It has only passed through the bridge box. 70 00:05:49,530 --> 00:05:50,300 OK. 71 00:05:50,700 --> 00:05:54,510 So I hope now it's more clear for you how difficult this flow inside my crew. 72 00:05:54,510 --> 00:05:55,840 Let's do another example. 73 00:05:56,010 --> 00:06:03,570 OK an example number three we have no bridge and we see that the packet needs to go in either that one 74 00:06:03,670 --> 00:06:04,390 end. 75 00:06:04,990 --> 00:06:09,270 So and then it needs to go out from it and that's fine. 76 00:06:10,290 --> 00:06:12,380 Let's see how the will flow. 77 00:06:12,600 --> 00:06:16,390 So it arrives through that one and then it comes to here. 78 00:06:16,400 --> 00:06:17,790 Is it part of a bridge. 79 00:06:17,790 --> 00:06:18,970 No it does not. 80 00:06:19,200 --> 00:06:22,490 There's no bridge you go to IP version 4. 81 00:06:22,680 --> 00:06:24,490 Is it an IP traffic. 82 00:06:24,510 --> 00:06:25,410 Yes it is. 83 00:06:25,440 --> 00:06:32,520 Then it will go here to rerouting rerouting send it to the routing decision routing decision say are 84 00:06:32,520 --> 00:06:39,570 you going to do it after all you are passing the traffic through the router so that the traffic is passing 85 00:06:39,570 --> 00:06:46,010 through the router to go from it and I find that if we go to the forward time and and before we send 86 00:06:46,010 --> 00:06:53,010 it to push trouting post routing send it through here and then it comes to here then it will say Are 87 00:06:53,080 --> 00:06:55,990 you part of the bridge. 88 00:06:56,030 --> 00:06:58,130 And in this case no I'm not. 89 00:06:58,420 --> 00:07:03,750 And then it would go this way that if we go out of it at 5:00. 90 00:07:04,170 --> 00:07:09,330 So you can see in this case you can't do mangle you can do filtering if you want. 91 00:07:09,330 --> 00:07:13,480 On the forward as an example because you pass through this train. 92 00:07:13,630 --> 00:07:14,010 Right. 93 00:07:14,070 --> 00:07:15,440 Now another example. 94 00:07:15,510 --> 00:07:20,650 I hope that you are following me and I'm not going very fast Actually it's straightforward. 95 00:07:20,940 --> 00:07:22,050 You can see the back flow. 96 00:07:22,050 --> 00:07:25,640 It's very complicated if you look at it from without the other side. 97 00:07:25,650 --> 00:07:28,960 But once you understand it you can see that it's not that difficult. 98 00:07:30,070 --> 00:07:36,320 We go to example number for example Number four we have two bridges. 99 00:07:36,590 --> 00:07:39,830 First bridge is having it in and too. 100 00:07:39,920 --> 00:07:45,980 And the second bridge has it in for anything not five and the back it needs to go from the not want 101 00:07:47,150 --> 00:07:51,920 and go out from Ethan at 5 OK. 102 00:07:52,000 --> 00:07:54,460 So let's see how the chart looks like now. 103 00:07:55,830 --> 00:08:03,440 So it comes to eating out of one here and that is to say Are you part of the bridge and in this case. 104 00:08:03,450 --> 00:08:03,970 Yes. 105 00:08:03,980 --> 00:08:05,860 And as long as part of the bridge. 106 00:08:06,330 --> 00:08:14,200 And then if we go to the rich decision and then the bridge decision say are you going to a which is 107 00:08:14,320 --> 00:08:18,810 inside your Pritch or you're going to another form. 108 00:08:19,070 --> 00:08:21,540 So that means you have to forward it. 109 00:08:21,680 --> 00:08:27,250 Then in this case I'm not sending the packet to a port which is inside the bridge. 110 00:08:27,620 --> 00:08:33,020 And what I need to do now I need to send it to a port which is in another bridge then we have to go 111 00:08:33,020 --> 00:08:34,500 to reach it. 112 00:08:34,790 --> 00:08:37,940 OK so before we see the other example if want to bridge forward. 113 00:08:37,940 --> 00:08:44,580 Now we go to Rich in both and then with we go Here we go to here you an IP version 4. 114 00:08:44,930 --> 00:08:45,590 Yes. 115 00:08:45,590 --> 00:08:47,580 So it's an IP packet. 116 00:08:47,980 --> 00:08:53,480 Then it we go to the pre-roll think and then to the routing decision they say how are you going to do 117 00:08:53,470 --> 00:08:54,310 it all. 118 00:08:54,590 --> 00:08:57,180 Are you going the other off of the phone. 119 00:08:57,200 --> 00:08:58,970 So I'm going to the other either. 120 00:08:59,090 --> 00:09:09,560 So then in this case if we go to forward post trouting go down here and that it comes to the interface 121 00:09:09,680 --> 00:09:15,200 which is our interface which for that is going to say Are you part of the bridge. 122 00:09:15,200 --> 00:09:16,520 So it's not five. 123 00:09:16,560 --> 00:09:18,880 It's part of another drive. 124 00:09:19,090 --> 00:09:21,400 Then if it is yes then it goes here. 125 00:09:21,530 --> 00:09:27,290 Yes bridging decision than it would go to the bridge. 126 00:09:27,410 --> 00:09:34,310 Both Be careful bridge output here is different than a bridge inputted those that are two different 127 00:09:34,670 --> 00:09:35,170 bridges. 128 00:09:35,180 --> 00:09:35,940 OK. 129 00:09:36,050 --> 00:09:43,940 Then as we go to the bridge sosh Now that goes here it goes through here to the physical interface and 130 00:09:43,940 --> 00:09:46,760 then it goes from it dinner at 5:00. 131 00:09:47,110 --> 00:09:47,630 OK. 132 00:09:47,780 --> 00:09:53,450 So this is an example when you have to portion two different approaches and then now the last example 133 00:09:53,450 --> 00:09:56,930 that I want to show you the see. 134 00:09:57,100 --> 00:10:03,670 Now we have one bridge which is having either that one and two inside of it and the packet needs to 135 00:10:03,670 --> 00:10:08,290 come to the next one which is inside that bridge and go out from Ethan at 5. 136 00:10:08,290 --> 00:10:16,120 So the bucket would come through it and that one needs to go out from it and that's five. 137 00:10:16,530 --> 00:10:20,980 And let's see how the bucket will flow that comes to that one. 138 00:10:21,310 --> 00:10:23,020 And then this is part of the bridge. 139 00:10:23,020 --> 00:10:23,740 Yes it is. 140 00:10:23,740 --> 00:10:30,820 It goes down and that it goes to the bridging decision and then it will say you're going to a port which 141 00:10:30,820 --> 00:10:36,550 is inside that bridge or you're going to another part that it's going to another port. 142 00:10:36,720 --> 00:10:45,140 Then it goes to the bridge and then it goes to the IP version for you back over IP version 4 traffic. 143 00:10:45,160 --> 00:10:54,130 Yes then it goes to the rerouting and then to that we go to the routing decision then it will check 144 00:10:54,130 --> 00:10:59,490 if it's going to outside the router or it's going to Putney's to go to the router itself. 145 00:10:59,490 --> 00:11:05,960 So it's going to another part of the office or outside go to the for post routing. 146 00:11:06,300 --> 00:11:11,470 Then it goes here then to here is not part of the Brigitta not 5 anymore. 147 00:11:11,710 --> 00:11:17,010 That goes here here here and then it goes out from within at 5:00. 148 00:11:17,380 --> 00:11:23,200 So again when you know where and which chain when you are on the routing it is then you can look to 149 00:11:23,200 --> 00:11:30,190 the chain and then you can see where you can if you can do any firewall or any Mongul any or not for 150 00:11:30,190 --> 00:11:32,230 example on that. 151 00:11:32,710 --> 00:11:38,800 So then there's the packet flow that I want to do something new I can't about the routing and the bridging 152 00:11:38,830 --> 00:11:39,210 only. 153 00:11:39,220 --> 00:11:43,260 You can also look for the site for bridging firewall. 154 00:11:43,260 --> 00:11:48,510 Also you can add the firewall and see if you want to do firewall the breeching. 155 00:11:48,670 --> 00:11:55,750 We can also look on the V line because then you can use the explanation D-cup solution but this is the 156 00:11:55,750 --> 00:11:56,910 most important part. 157 00:11:57,040 --> 00:12:00,500 Dropping the bridging because that's what is mostly used. 158 00:12:00,790 --> 00:12:06,280 So I hope with those examples and with this explanation you could understand what this did Paxo you 159 00:12:06,280 --> 00:12:10,490 can not find that it's really all love anywhere. 160 00:12:10,810 --> 00:12:15,920 It's really a struggle even for instructors to stand up all the backflow in my critique. 161 00:12:16,060 --> 00:12:23,060 But I think that the way I have made it for you it should be more easy and clear to be understandable. 162 00:12:23,200 --> 00:12:26,760 I hope that you enjoyed this lecture and I wish you and the OP and.