1 00:00:09,590 --> 00:00:14,270 This is one of multiple IP version six troubleshooting videos. 2 00:00:14,570 --> 00:00:20,150 We've been told that rather one in this topology cannot ping rather three. 3 00:00:20,420 --> 00:00:23,870 So let's verify that he has right a one. 4 00:00:24,830 --> 00:00:29,390 So let's ping 2001 face colon. 5 00:00:29,390 --> 00:00:30,440 Colon three. 6 00:00:30,800 --> 00:00:32,210 Ping doesn't succeed. 7 00:00:32,210 --> 00:00:34,400 We get unreachable messages. 8 00:00:34,970 --> 00:00:45,740 Now show IP route won't help you in this topology because there are no IP version for addresses configured 9 00:00:45,740 --> 00:00:46,580 on the router. 10 00:00:46,880 --> 00:00:51,740 We can see that gigabit to zero zero is up and the loopback interfaces up. 11 00:00:52,130 --> 00:00:58,580 But what we need to do is use show IP interface brief to see the IP address as configured on the router. 12 00:00:59,060 --> 00:01:03,470 We can use traceroute to see how far traffic gets. 13 00:01:05,030 --> 00:01:11,840 In this example, we can see that the trace gets to 2001 colon one colon colon two, which is rather 14 00:01:11,840 --> 00:01:12,500 two. 15 00:01:13,070 --> 00:01:17,810 And again, we could use commands such as show IP route to view the routing table. 16 00:01:18,260 --> 00:01:23,450 Now rather, one has a default route to router two. 17 00:01:24,500 --> 00:01:29,250 Traffic is getting to router two but is going no further. 18 00:01:29,270 --> 00:01:31,220 So let's have a look at rather to. 19 00:01:33,490 --> 00:01:38,530 Ping 2001 face three. 20 00:01:39,200 --> 00:01:40,520 Notice what we're told. 21 00:01:40,520 --> 00:01:43,490 No valid route to the destination. 22 00:01:43,880 --> 00:01:48,110 So what do you think I should type now to verify what's going on? 23 00:01:48,230 --> 00:01:49,960 Should I look at layer one? 24 00:01:49,970 --> 00:01:54,650 So use commands such as show IP interface brief to verify layer one. 25 00:01:54,830 --> 00:01:56,520 In this example, layer one is up. 26 00:01:56,520 --> 00:01:57,020 Up. 27 00:01:57,350 --> 00:01:59,210 Notice the interface is. 28 00:02:00,280 --> 00:02:01,050 Up, up. 29 00:02:01,320 --> 00:02:05,010 So it looks like layer one is up and layer two is up. 30 00:02:06,090 --> 00:02:11,820 Should I use commands such as Show CDP neighbors to verify that a layer two is working? 31 00:02:12,210 --> 00:02:16,740 In this example, we can see that router three is connected to router two. 32 00:02:16,770 --> 00:02:20,070 So that implies that a layer two is working. 33 00:02:20,550 --> 00:02:25,140 Show IP router won't help us because they are no IP version for rats. 34 00:02:25,140 --> 00:02:27,600 But what about show IPV six rot? 35 00:02:28,020 --> 00:02:30,480 Can you see the problem in this output? 36 00:02:34,720 --> 00:02:38,530 Is there a route to the loopback of router three? 37 00:02:39,610 --> 00:02:41,620 Notice there's no rot to rot. 38 00:02:41,620 --> 00:02:49,930 A three in the routing table show IPV six rot to include face only shows us a static rot to write a 39 00:02:49,930 --> 00:02:53,710 one and a local connection on router two. 40 00:02:53,890 --> 00:02:56,380 So again, show IPV six rot. 41 00:02:56,770 --> 00:02:59,080 There is no rot in the routing table. 42 00:02:59,140 --> 00:03:01,930 Show IPV six protocols. 43 00:03:02,410 --> 00:03:09,790 We don't have a routing protocol such as RIP or OSPF enabled, but we do have static routes configured. 44 00:03:10,090 --> 00:03:11,980 So show run pipe. 45 00:03:11,980 --> 00:03:13,870 Include root. 46 00:03:15,170 --> 00:03:21,710 We can see a static route to the loopback of router one and then there's a default route to router three. 47 00:03:22,160 --> 00:03:24,200 Notice the next stop is 2001. 48 00:03:24,200 --> 00:03:25,310 Colon two. 49 00:03:25,310 --> 00:03:27,080 Colon colon two. 50 00:03:27,110 --> 00:03:29,360 So can we ping 2001? 51 00:03:29,360 --> 00:03:30,080 Colon two. 52 00:03:30,080 --> 00:03:31,460 Colon colon two. 53 00:03:31,760 --> 00:03:35,210 Notice we told that there's no rut in the routing table. 54 00:03:35,240 --> 00:03:39,650 In other words, we don't have a route to a router that's directly connected to us. 55 00:03:40,100 --> 00:03:41,690 Can we ping ourselves? 56 00:03:41,690 --> 00:03:43,700 So 2001, colon two. 57 00:03:43,700 --> 00:03:45,140 Colon, colon one. 58 00:03:45,650 --> 00:03:50,630 We told that we don't have a route to our local IP address that doesn't look right. 59 00:03:50,630 --> 00:03:55,250 So show IPV six interface brief. 60 00:03:55,910 --> 00:03:58,060 What's the problem in this output? 61 00:03:58,070 --> 00:04:00,380 If you need to pause the video. 62 00:04:00,380 --> 00:04:01,940 But what's the problem? 63 00:04:03,480 --> 00:04:09,990 Notice here, gigabyte zero one has an IP address configured of 2001 colon. 64 00:04:09,990 --> 00:04:11,490 One colon to colon. 65 00:04:11,490 --> 00:04:16,620 Colon one when in actual fact it should be 2001 two one. 66 00:04:16,980 --> 00:04:20,160 There's an extra one in the network. 67 00:04:20,459 --> 00:04:22,510 So show run interface gigabit. 68 00:04:22,530 --> 00:04:23,610 Zero one. 69 00:04:24,120 --> 00:04:27,360 Notice the extra one in the network address. 70 00:04:28,200 --> 00:04:29,460 So let's fix that. 71 00:04:29,460 --> 00:04:30,360 So no. 72 00:04:30,900 --> 00:04:32,580 IPV six address. 73 00:04:33,540 --> 00:04:37,440 IPV six address 2001 two. 74 00:04:38,420 --> 00:04:38,900 Colon. 75 00:04:38,900 --> 00:04:41,300 Colon one slash 64. 76 00:04:42,110 --> 00:04:44,480 Can we ping 2001? 77 00:04:44,870 --> 00:04:47,540 Colon two, colon colon two. 78 00:04:48,050 --> 00:04:49,670 Now we can ping root of three. 79 00:04:49,700 --> 00:04:52,130 What about the loopback of router three? 80 00:04:53,400 --> 00:04:56,580 We can ping the loopback of router three, so that looks promising. 81 00:04:56,970 --> 00:05:02,190 What about from router one paying the loopback of router three? 82 00:05:02,190 --> 00:05:03,840 So yes, that looks good. 83 00:05:03,840 --> 00:05:09,990 We can ping the loopback of of three and we can ping the physical interface of router three. 84 00:05:10,170 --> 00:05:13,110 Be careful with your IP addresses. 85 00:05:15,290 --> 00:05:17,000 Look at your running tables. 86 00:05:17,030 --> 00:05:22,010 Look at the configuration of your IP addresses to verify that it's correct. 87 00:05:22,250 --> 00:05:27,440 Previously, we didn't have the static route in the routing table, but now we do. 88 00:05:29,920 --> 00:05:32,770 So previously the static route was missing. 89 00:05:32,770 --> 00:05:38,380 We had a static route to the loop of the one, but no static route to the loop back of Rider three. 90 00:05:39,010 --> 00:05:43,720 Now we can get to the loopback of router three because of this default route. 91 00:05:44,110 --> 00:05:45,580 I hope you enjoyed this video. 92 00:05:45,580 --> 00:05:50,710 If it's been of benefit to you, please like it and please subscribe to my YouTube channel. 93 00:05:51,010 --> 00:05:53,080 I wish you all the very best.