1 00:00:01,050 --> 00:00:08,670 IP version 6 or link local addresses are unique cost addresses but restricted to the local link hence 2 00:00:08,670 --> 00:00:10,910 the name link local. 3 00:00:11,000 --> 00:00:13,110 They also 428 bits and lanes. 4 00:00:13,200 --> 00:00:20,130 The interface identifies automatically configured with the EU IP address note however that the most 5 00:00:20,130 --> 00:00:28,830 significant 10 bits of the address start with C.A.T. in hexadecimal or seven binary ones followed by 6 00:00:28,830 --> 00:00:36,160 binary zero followed by binary one followed by binary zero in binary routing protocols use link local 7 00:00:36,160 --> 00:00:43,750 addresses to advertise routes to one another and an IP version 6 at a node having a global unicast address 8 00:00:44,200 --> 00:00:50,230 on a local link will use the link local address of its default IPV six router rather than the global 9 00:00:50,230 --> 00:00:52,040 unicast address. 10 00:00:52,180 --> 00:00:57,670 This is good because if the network is renumbered the default router can still be used using the linked 11 00:00:57,670 --> 00:01:05,330 local address link local addresses won't change when you renumber your global unicast addresses. 12 00:01:07,050 --> 00:01:15,040 Site local addresses are also another type of unicast address but have a limited scope to a site so 13 00:01:15,120 --> 00:01:20,920 that local addresses are not enabled by default on nodes unlike link local addresses which are automatically 14 00:01:20,920 --> 00:01:21,670 enabled. 15 00:01:21,760 --> 00:01:28,420 In other words you have to configure site local addresses the address starts with E.S. Zira with the 16 00:01:28,420 --> 00:01:35,380 most significant 10 bits set in binary 2:07 binary ones followed by binary zero followed by two binary 17 00:01:35,380 --> 00:01:36,100 ones. 18 00:01:37,060 --> 00:01:45,250 So the most significant 10 bits of a site local address always starts with this value side local addresses 19 00:01:45,760 --> 00:01:50,350 or the IP version 6 equivalent of RAFC 19:18 addresses. 20 00:01:50,350 --> 00:01:55,480 These however have been deprecated and should no longer be used. 21 00:01:55,480 --> 00:02:02,350 But the idea was that you could have many many subnets within your organization as we would now have 22 00:02:02,350 --> 00:02:11,410 54 beds for subsetting which is far greater than the 16 beds that you get with global unicast addresses. 23 00:02:12,660 --> 00:02:19,800 The next up of address is an IPV for compatible IP D6 address in this address. 24 00:02:19,940 --> 00:02:27,560 The most significant 96 bits are set to zero and the least significant 32 bits are set to the IP version 25 00:02:27,560 --> 00:02:29,580 for address. 26 00:02:29,750 --> 00:02:37,760 This is a special unit cost IPV 6 address uses a transition mechanism on hosts and routers to automatically 27 00:02:37,760 --> 00:02:44,850 create IPV for tunnel's to deliver IPV six packets over IPV four networks. 28 00:02:44,900 --> 00:02:52,730 This mechanism allowed for the automatic establishment of an IP V-6 over IPV for tunnel between two 29 00:02:52,760 --> 00:03:02,180 nodes over an ITV for infrastructure using the IP version for destination address inside the destination 30 00:03:02,210 --> 00:03:04,980 IP V-6 address. 31 00:03:05,090 --> 00:03:07,890 So the format of the address would be as follows. 32 00:03:07,970 --> 00:03:15,290 The most significant 96 to be set to zero the least significant 32 bits would be set to the decimal 33 00:03:15,290 --> 00:03:21,590 representation of the IP version 4 address that could be rewritten as follows. 34 00:03:21,590 --> 00:03:29,870 So colon colon 1 9 2 0 to 100 the decimal Ickey version for address could also be written as a hexadecimal 35 00:03:29,870 --> 00:03:30,950 value. 36 00:03:30,950 --> 00:03:42,260 So this would be the same address for example 190 in decimal is equal to zero in hexadecimal. 37 00:03:42,690 --> 00:03:47,240 Notice 1 2 equates to CCRA. 38 00:03:47,250 --> 00:03:54,070 So once again it's used to represent the addresses of IP version 4 nodes as IP version 6 addresses that 39 00:03:54,090 --> 00:04:00,570 please note that this address format has been deprecated in favor of other more enhanced transmission 40 00:04:00,570 --> 00:04:07,570 mechanisms such as dynamic net Peetie or net protocol translation. 41 00:04:07,740 --> 00:04:15,960 It's also important to point out that the IPV for comparable IPV six addresses use a slash 96 mosque. 42 00:04:16,330 --> 00:04:19,330 So 96 Burts are set to zero. 43 00:04:19,680 --> 00:04:26,940 The mosque is Flesch 96 the least significant 32 bits are set to the IP version for address either in 44 00:04:26,940 --> 00:04:35,100 dotted decimal notation such as here or a hexadecimal representation of the address like in this example. 45 00:04:36,670 --> 00:04:42,400 As I've already mentioned unspecified addresses is where the address is set to zeros and it's used as 46 00:04:42,400 --> 00:04:44,790 a placeholder when no address is available. 47 00:04:44,920 --> 00:04:53,300 So during an initial DHP request or duplicate address detection loopback addresses are set to zeros 48 00:04:53,910 --> 00:04:55,490 and Lasley or 1. 49 00:04:55,560 --> 00:05:02,690 This is equivalent to 127 0 0 1 an IP version for and is used by the host to identify itself. 50 00:05:03,030 --> 00:05:09,440 I've already demonstrated this and can be used to check that the IP V-6 protocol stack is functioning 51 00:05:09,440 --> 00:05:10,100 properly. 52 00:05:12,210 --> 00:05:19,650 So in summary IPV 6 UNI cost addresses can be broken up into six types. 53 00:05:19,650 --> 00:05:21,460 The first type is unspecified. 54 00:05:21,570 --> 00:05:31,440 So colon colon slash 128 then loop back colon colon one slash 128 and then we have aggregated all global 55 00:05:31,450 --> 00:05:39,690 unicast addresses and yes some examples of ranges these Remember globally unique There's no need for 56 00:05:39,690 --> 00:05:45,670 net because you have global reachability that addresses unique globally. 57 00:05:45,790 --> 00:05:51,550 Then we have link local addresses which address is used only on the local link used for example by writing 58 00:05:51,550 --> 00:06:01,920 protocols starts with 80 in hexadecimal site local addresses or similar in concept to RAFC 19:18 private 59 00:06:01,920 --> 00:06:02,940 addresses. 60 00:06:03,180 --> 00:06:09,330 They start with F E CCRA IPV for compatible addresses. 61 00:06:09,560 --> 00:06:17,660 The most significant 96 bets are set to zero and this allowed us to create automatic tunneling of IPV 62 00:06:17,670 --> 00:06:26,590 six over IPV for both site local and IPV for comparable addresses have been deprecated now multicast 63 00:06:26,590 --> 00:06:29,410 addresses are broken up into two parts. 64 00:06:29,450 --> 00:06:37,120 If if the 00 slash 8 or assigned multi-course addresses and then you have solicited node multi-course 65 00:06:37,120 --> 00:06:44,160 addresses for each unique cost and any cost address configured on an interface of a node or Rodda a 66 00:06:44,180 --> 00:06:50,720 corresponding solicited node multicast address is automatically enabled the solicited node multicast 67 00:06:50,720 --> 00:06:54,210 address is scoped to the local link. 68 00:06:55,050 --> 00:07:02,910 This as an example is used for the replacement of up an IP version for if you remember up uses broadcasts 69 00:07:03,570 --> 00:07:10,300 but broadcasts are no longer supported in IP version 6 so the solicited node multicast address is used 70 00:07:10,300 --> 00:07:16,280 by nodes and has to learn the linked layer addresses of Navan nodes and routers on the same link. 71 00:07:17,350 --> 00:07:24,670 So very similar concept to up but we are not using broadcasts we are using multicast duplicate address 72 00:07:24,670 --> 00:07:31,000 detection or dead can be used by a node to verify whether an IP V-6 address is already in use on its 73 00:07:31,000 --> 00:07:32,100 local link. 74 00:07:32,290 --> 00:07:38,500 Before using that address to configure its own IP V-6 address with stateless order configuration 75 00:07:41,350 --> 00:07:50,440 stateless order configuration is a new function enabled by IP version 6 by having a much larger address 76 00:07:50,440 --> 00:07:58,090 space IP version 6 is designed to enable order configuration of IP addresses on devices while keeping 77 00:07:58,090 --> 00:08:00,240 those addresses unique. 78 00:08:00,280 --> 00:08:09,760 This enables basic Servilius configuration of nodes as well as easy renumbering routers same periodic 79 00:08:09,820 --> 00:08:14,230 router advertisements using a link local address. 80 00:08:14,300 --> 00:08:19,560 I wouldn't try and remember these addresses but the address used would be this. 81 00:08:19,750 --> 00:08:26,080 But the source address used would be this going to a multicast address of if have zero to Colan column 82 00:08:26,080 --> 00:08:26,800 one. 83 00:08:26,800 --> 00:08:34,750 In other words all nodes on the link the router uses ICMP version 6 type 1:34 which is known as a rat 84 00:08:34,760 --> 00:08:42,260 advertisement telling notes information like what prefix to use what the default gateway is. 85 00:08:42,890 --> 00:08:50,410 And a lifetime of this prefix that's advertised to them the advertisement period can vary and you can 86 00:08:50,410 --> 00:08:54,180 also change the lifetime of the prefix advertise to hosts 87 00:08:56,780 --> 00:09:02,510 host initially boots up the node will need its IP address as soon as possible. 88 00:09:02,900 --> 00:09:09,380 And normally in the early stages of the boot process it could wait for a long period of time for the 89 00:09:09,380 --> 00:09:16,510 next Rodda advertisement to get the information it needs to configure its interfaces and thus a Knodell. 90 00:09:16,550 --> 00:09:23,790 I wrote a solicitation message to routers on the network asking them to reply immediately with that 91 00:09:23,900 --> 00:09:31,260 advertisement so that the note can immediately order configure its IP address so the host will send 92 00:09:31,390 --> 00:09:39,120 a solicitation to all is using the all Rajiv's multi-course address if it is 0 2 colon colon to the 93 00:09:39,120 --> 00:09:43,050 host uses ICMP version 6 type 1:33. 94 00:09:43,050 --> 00:09:48,320 Again I wouldn't try and remember all of these ICMP types just understand the process. 95 00:09:48,900 --> 00:09:55,400 The host uses to link local address as the source of the Rodda solicitation request. 96 00:09:55,650 --> 00:10:03,140 So Jesus if he followed by its address as the source and the message goes to destination of if it's 97 00:10:03,310 --> 00:10:12,630 to quote unquote and to all rodders on the local link wrote will reply to that message using ICMP version 98 00:10:12,630 --> 00:10:14,310 6 type 1 3 4. 99 00:10:14,670 --> 00:10:21,090 The Radu will use it to link local address of if he and why as the source and the destination will go 100 00:10:21,100 --> 00:10:23,460 to if it's 0 2 color in column 1. 101 00:10:23,460 --> 00:10:29,850 In other words all nodes on the link so the configuration has the advantage in that enables plug and 102 00:10:29,850 --> 00:10:33,250 play configuration of IPV six devices. 103 00:10:33,750 --> 00:10:42,180 You just configure an IP address on the router and by default route advertisements are enabled PCs and 104 00:10:42,180 --> 00:10:48,090 other devices can be plugged into the network and they will automatically learn the prefix assigned 105 00:10:48,090 --> 00:10:55,140 to them and default gateway without the administrator configuring at the HGP server or manually configuring 106 00:10:55,170 --> 00:10:56,580 IP addresses. 107 00:10:56,580 --> 00:11:02,110 Hosts are automatically configured with the prefix received and then they combine that with a link layer 108 00:11:02,160 --> 00:11:02,790 address. 109 00:11:02,790 --> 00:11:09,360 In other words the address to configure a local IP B-6 address to allow them to communicate with the 110 00:11:09,360 --> 00:11:11,340 network. 111 00:11:11,340 --> 00:11:16,200 Another advantage of status or configuration is the renumbering of devices. 112 00:11:16,290 --> 00:11:25,200 A router can just advertise a new prefix and time out the old prefix if required and hosts will automatically 113 00:11:25,200 --> 00:11:28,090 be updated with the new prefix information. 114 00:11:28,560 --> 00:11:36,750 So gone are the days of struggling to reconfigure and renumber the IP addresses of hosts now stateful 115 00:11:36,750 --> 00:11:41,710 DHP still exists in version 6 of DHP. 116 00:11:42,000 --> 00:11:46,100 It provides more control in stateless configuration. 117 00:11:46,260 --> 00:11:54,030 For example if using Cisco IP phones they need to learn an option 150 from a DHP server which tells 118 00:11:54,030 --> 00:12:00,610 the phones the TFT server they need to connect to to download their configuration as well as their firmware 119 00:12:01,750 --> 00:12:03,130 so DHP. 120 00:12:03,250 --> 00:12:08,830 In some cases is still required as it gives us more control and more options. 121 00:12:08,830 --> 00:12:16,150 Now that said you can use stateful DHP concurrently with stateless order configuration. 122 00:12:16,150 --> 00:12:22,310 So you don't have to make an explicit choice between the two stateful DHP can also provide IP version 123 00:12:22,310 --> 00:12:24,770 6 addresses in the absence of routers. 124 00:12:24,800 --> 00:12:30,210 So in this topology there are no routers so DHP server can be configured. 125 00:12:30,440 --> 00:12:36,770 It can also be used for network renumbering in the same way as an IP version 4 and it can be used for 126 00:12:36,770 --> 00:12:41,210 automatic domain name registration of hosts using dynamic DNS. 127 00:12:41,440 --> 00:12:47,260 So a lot of the concepts available in IP version for all supply an IP version 6. 128 00:12:47,440 --> 00:12:51,680 Now in this example we have both a router and a DGP server. 129 00:12:52,420 --> 00:12:58,890 Now the process for acquiring configuration data for version 6 Cline is very similar to IP version for. 130 00:12:59,040 --> 00:13:05,770 However initially the client will first detect the presence of routers on the linked by using neighbor 131 00:13:05,770 --> 00:13:07,440 discovery messages. 132 00:13:07,630 --> 00:13:13,330 If at least one router is found as in this diagram the client will examine the rod advertisements to 133 00:13:13,330 --> 00:13:16,440 determine if DHP version 6 should be used. 134 00:13:16,780 --> 00:13:22,480 If there are advertisements and able to use of DHP version 6 on the link or if there's no Rodda the 135 00:13:22,480 --> 00:13:27,570 client then starts a DHB solicit phase to find a DHP server. 136 00:13:28,210 --> 00:13:31,440 So in this example the HGP version 6 can be used. 137 00:13:31,750 --> 00:13:37,310 So the host will send a DHP solicit message to DHP version 6 agents. 138 00:13:37,330 --> 00:13:40,450 In other words the AGP servers using multicast address. 139 00:13:40,480 --> 00:13:48,460 If if 0 2 colon colon one colon to once again just remember anything starting with 0 2 is a multicast 140 00:13:48,460 --> 00:13:50,080 address. 141 00:13:50,130 --> 00:13:53,910 We do not have broadcasts in IP version 6. 142 00:13:54,130 --> 00:13:59,320 Send the place of broadcasts we using specific multicast addresses. 143 00:13:59,610 --> 00:14:02,760 The hosts will use a source address of he. 144 00:14:02,790 --> 00:14:06,150 In other words a link local address. 145 00:14:06,180 --> 00:14:14,100 Now both DHP servers and DHP relays will listen for DHP solicit messages on the multicast address. 146 00:14:14,520 --> 00:14:17,270 So DHP forwarding is very similar. 147 00:14:17,280 --> 00:14:21,610 IP version 6 as it's in IP version 4. 148 00:14:21,620 --> 00:14:29,780 Now if DHP cannot be used the host reverts to stateless configuration as per the previous examples I've 149 00:14:29,780 --> 00:14:30,790 shown you. 150 00:14:31,340 --> 00:14:35,590 Now without further ado let's set up a basic IP version 6 network. 151 00:14:35,630 --> 00:14:43,430 In this example I have route 1 and router to both routers have a foster ethernet interface router one's 152 00:14:43,430 --> 00:14:46,680 network on the first Ethan and interfaces going to be 2001. 153 00:14:46,730 --> 00:14:50,840 Column One column one column one route to use force. 154 00:14:50,840 --> 00:14:55,870 Ethan It's subnet is going to be 2001 and one color one color and three. 155 00:14:55,940 --> 00:15:01,730 The rod is connected by a serial link and the subnet is going to be two thousand and one color and one 156 00:15:01,730 --> 00:15:03,410 color and one color. 157 00:15:04,100 --> 00:15:11,510 Notice once again the subnet mask is always slushed 64 on all subnets OK so an Rotto one. 158 00:15:11,580 --> 00:15:14,590 I'm going to break out of the initial configuration dialog 159 00:15:19,550 --> 00:15:28,380 going into global config mode and give the Rodda a name and then I'm going to enable IPV sake's unique 160 00:15:28,390 --> 00:15:29,530 cost routing 161 00:15:33,180 --> 00:15:35,490 so that we can run IP B-6 on this router. 162 00:15:37,190 --> 00:15:39,430 And then I'm going to go on to 0 0. 163 00:15:39,480 --> 00:15:47,200 The first Ethan interface and give it an address or IPV V-6 and notice there are a lot of options here. 164 00:15:47,220 --> 00:15:56,600 But I'm going to specify a trace and then I'm going to specify an IP V-6 address so 2001 165 00:16:00,300 --> 00:16:11,540 and in this case I'm going to give the interface an address of one such a simple as that to configure 166 00:16:12,110 --> 00:16:19,680 an IP version 6 address on a router this portion is the network portion. 167 00:16:19,740 --> 00:16:22,220 And notice we've got colon colon. 168 00:16:22,530 --> 00:16:25,180 So there a bunch of zeros not displayed here. 169 00:16:26,190 --> 00:16:29,530 And we ending in a one. 170 00:16:29,780 --> 00:16:35,860 And then I can no shut the interface. 171 00:16:35,940 --> 00:16:41,800 And as you can see the interface has come up so knock and taught do pain 2001 172 00:16:45,940 --> 00:16:47,310 and ping the IP address. 173 00:16:47,350 --> 00:16:53,080 And as you can see the ping is successful on the serial zero interface. 174 00:16:53,080 --> 00:16:58,810 I can do the same thing IPV six the race 2001 175 00:17:04,830 --> 00:17:08,080 and on this side I'm giving in an address of Colan one. 176 00:17:08,100 --> 00:17:10,990 And on this side I'm going to give an address of code on. 177 00:17:11,180 --> 00:17:13,360 So I'm ready to do the same thing. 178 00:17:13,630 --> 00:17:19,210 Enable IPV six unique cost routing and then on Sirius there Ciro. 179 00:17:19,680 --> 00:17:24,070 Give it an ITV 6 address of 2001 180 00:17:30,460 --> 00:17:33,850 no shuttler interface and 0 0 0. 181 00:17:33,850 --> 00:17:34,690 Give it an address 182 00:17:42,030 --> 00:17:49,300 and I shut that interface. 183 00:17:49,330 --> 00:18:03,410 So hopefully now from Rodek to you I should be able to ping route one. 184 00:18:03,500 --> 00:18:09,690 That doesn't work because I forgot to know shut the interface on the side so no shut it and go back 185 00:18:09,690 --> 00:18:13,640 to Ratatouille and let's see if the ping succeeds this time. 186 00:18:16,110 --> 00:18:20,460 The interface came up and as you can see the ping succeeded. 187 00:18:20,470 --> 00:18:25,210 It's as simple as that to configure IP addresses on a Cisco router. 188 00:18:25,750 --> 00:18:32,160 Now on the first Ethan interface I could give it another IP address so I could say IP V-6 trace. 189 00:18:32,250 --> 00:18:33,790 Let's just be lazy. 190 00:18:34,050 --> 00:18:39,490 It's given an address of 2001 call and call on one special 64. 191 00:18:39,880 --> 00:18:43,600 And as you can see the rod has accepted that address on the road. 192 00:18:43,600 --> 00:18:45,710 I cannot ping 2001. 193 00:18:45,760 --> 00:18:47,460 Carl uncolored on one. 194 00:18:47,830 --> 00:18:49,730 And as you can see the pings succeeds. 195 00:18:50,050 --> 00:18:52,850 I could go back to the interface and give it an address as follows. 196 00:18:52,870 --> 00:19:00,490 IPV 6 address and it's a 2001 colon to Colon colon. 197 00:19:00,580 --> 00:19:03,400 Notice it gives you the option of link local address but we don't want to do that. 198 00:19:03,400 --> 00:19:06,100 Let's go for Slash 64. 199 00:19:06,370 --> 00:19:12,000 Notice please I haven't put a host portion on this address. 200 00:19:12,080 --> 00:19:14,470 Just specify the network portion. 201 00:19:14,790 --> 00:19:19,830 And now what I can do is I can specify UI 64 and hit enter. 202 00:19:20,280 --> 00:19:23,830 So we are going to use the Mac address as part of that address. 203 00:19:23,850 --> 00:19:30,330 So now I can type the command show run interface if seriously sirra to show you the configuration. 204 00:19:30,640 --> 00:19:35,220 And as you can see there's no provision for address configured on this interface. 205 00:19:35,220 --> 00:19:41,160 There are only IP version 6 addresses and there are three IP version 6 addresses that we have manually 206 00:19:41,160 --> 00:19:47,440 configured I couldn't type show interface if zeros are 0. 207 00:19:47,520 --> 00:19:57,820 The MAC address of this interface is C 4 0 1 0 F E 8 followed by four zeros. 208 00:19:57,830 --> 00:20:05,540 So the vendor portion of this address is see 4 0 1 0 F and the unique portion is 8 followed by four 209 00:20:05,540 --> 00:20:06,680 zeros. 210 00:20:06,680 --> 00:20:14,430 So just to display that nicely I'm going to say show interface if 0 0 pipe include a set. 211 00:20:14,450 --> 00:20:20,500 Only shows that MAC address in the output in there it is. 212 00:20:20,660 --> 00:20:29,570 And then I'm going to talk show IPV 6 interface 0 0 and only include the addresses that we configured 213 00:20:30,880 --> 00:20:35,070 and the other three IP addresses we configured on the interface. 214 00:20:35,100 --> 00:20:41,620 So notice here please we'll start from the right inside the unique portion of the MAC address is eight 215 00:20:41,660 --> 00:20:48,690 followed by four zeros there it is in the IP address remember leading zeros can be dropped. 216 00:20:48,790 --> 00:20:52,460 So this zero represents those four zeros. 217 00:20:52,630 --> 00:21:02,590 He ate is the eat of they f f f e has been inserted in the address to make it sixty four bucks and then 218 00:21:02,590 --> 00:21:06,300 notice the remaining portion is C 4 0 1 0. 219 00:21:06,320 --> 00:21:17,520 If which is represented here I see 6 0 1 if once again leading zeros can be removed. 220 00:21:17,530 --> 00:21:19,880 Notice the zero in front of this f has been removed 221 00:21:22,690 --> 00:21:35,050 see 4 0 1 has been converted to see 6 0 1 because the 7th bet has been changed to a one to represent 222 00:21:35,050 --> 00:21:47,970 at this mac addresses globally unique so notice a IP address is derived from the MAC address by using 223 00:21:47,970 --> 00:21:51,120 the UI representation of the MAC address 224 00:21:54,330 --> 00:21:55,670 let's start to come on. 225 00:21:55,770 --> 00:22:00,280 Show the six interface. 226 00:22:00,310 --> 00:22:02,280 It's 0 7 0. 227 00:22:03,130 --> 00:22:11,190 And as you'll see here notice there are three globally unique unique addresses configured on the interface 228 00:22:12,960 --> 00:22:14,190 notice on this interface. 229 00:22:14,220 --> 00:22:16,140 IPV 6 is enabled. 230 00:22:16,380 --> 00:22:26,490 And there is a link local address starting with Haiti and the EU portion of the address if F-F 0 2 on 231 00:22:26,510 --> 00:22:36,500 Call 1 represents all nodes and Rod is on the link if it Gerrity colon colon to represent all rodders 232 00:22:36,680 --> 00:22:38,560 on the link. 233 00:22:38,660 --> 00:22:45,140 This is the solicited node multi-course address used for mechanisms that replace up in other words. 234 00:22:45,140 --> 00:22:49,290 This is the address used by duplicate address detection or dead. 235 00:22:49,820 --> 00:22:59,520 Are solicited node multicast address for each unique link ID so solicited node multi-course addresses 236 00:22:59,520 --> 00:23:09,510 consist of f f 0 t colon colon one colon F F and then the unique portion of the interface ID. 237 00:23:09,680 --> 00:23:18,450 So as an example you can see this is 001 which is the same for this address and this address that here. 238 00:23:18,460 --> 00:23:28,570 Notice we have if if 0 2 column call on one colon if f e 8 0 because of this entry here which is different 239 00:23:28,570 --> 00:23:29,840 to the previous addresses.