1 00:00:01,180 --> 00:00:07,780 Benas allow you to display text when a user connects to a Cisco router with a switch. 2 00:00:08,020 --> 00:00:14,770 This is often used to display a message perhaps a message of the day indicating that maintenance will 3 00:00:14,770 --> 00:00:22,570 be done on the network or more often these days it's used to display a illegal message setting that 4 00:00:22,630 --> 00:00:25,850 unauthorized access is not permitted. 5 00:00:25,900 --> 00:00:31,210 If a hacker connects to your router or switch as an example and you don't display some kind of warning 6 00:00:31,210 --> 00:00:38,830 message or some message to indicate that unauthorized access is not permitted it may be more difficult 7 00:00:38,830 --> 00:00:45,060 to prosecute them as they would state that there was no indication that access is not allowed. 8 00:00:45,310 --> 00:00:50,160 It's a very bad idea to have a message saying welcome to my router. 9 00:00:50,340 --> 00:00:56,140 Welcome to my switch because that would indicate that someone is allowed to access that device. 10 00:00:56,170 --> 00:01:03,490 It's a good idea to get some input from your legal department to find out what message should be used 11 00:01:03,820 --> 00:01:10,420 as a corporate policy or in specific countries of the world you couldn't as an example say that if you 12 00:01:10,420 --> 00:01:12,610 access my rod I'm going to shoot you. 13 00:01:12,700 --> 00:01:14,100 That wouldn't be legal. 14 00:01:14,170 --> 00:01:18,090 As an example Benas can display all kinds of text. 15 00:01:18,160 --> 00:01:26,200 Here's an example of a router and I've got configured so in this example on into my username and password 16 00:01:26,650 --> 00:01:33,590 and I'll be able to log into the router but noticed some kind of message is displayed stating that you 17 00:01:33,590 --> 00:01:36,250 shouldn't access the device unless authorized. 18 00:01:36,560 --> 00:01:42,380 And here is some additional information is provided to the user if they want to access these labs. 19 00:01:43,150 --> 00:01:45,290 No such message is displayed by default. 20 00:01:45,320 --> 00:01:53,100 So as an example if our telnet from Rodda want to write it to I'm able to log in and all I'm prompted 21 00:01:53,100 --> 00:01:58,970 for is the user access verification which in this case is a password. 22 00:01:59,400 --> 00:02:05,460 No Benas have been configured on this router but in global configuration mode you can use the command 23 00:02:05,460 --> 00:02:12,060 Bena and questionmark to view various types of banners that can be configured on a router or switch 24 00:02:12,750 --> 00:02:18,750 for the CCN a course we are going to concentrate on the exec banner loggin banner and message of the 25 00:02:18,750 --> 00:02:23,480 Day bomber of the messages such as in-coming can also be configured. 26 00:02:23,640 --> 00:02:29,910 But that's important for CCMA a message of the day Banham may be used to display a temporary message 27 00:02:30,510 --> 00:02:35,710 such as a router may be taken off line for maintenance at a specific time. 28 00:02:36,680 --> 00:02:45,170 A loggin banner is shown before a user logs in C may display a message such as unauthorized access is 29 00:02:45,170 --> 00:02:48,440 prohibited and exec Abana displays. 30 00:02:48,480 --> 00:02:50,030 After Logan. 31 00:02:50,210 --> 00:02:57,320 You could use this to display information that only internal staff should know such as the physical 32 00:02:57,320 --> 00:02:59,210 location of the device. 33 00:02:59,540 --> 00:03:07,630 So the information is not shown before logging only after your theni case it is the information displayed. 34 00:03:07,630 --> 00:03:11,520 Now you don't have to use those messages in that way. 35 00:03:12,280 --> 00:03:20,910 This is actually being configured on the router as a message of the day so on a show run pipe to begin 36 00:03:20,970 --> 00:03:21,450 bandha 37 00:03:24,480 --> 00:03:26,730 here's the show command. 38 00:03:26,790 --> 00:03:33,630 I notice the command used here is Bena message of the day which displays some ASCII text and then a 39 00:03:33,630 --> 00:03:37,230 warning message and then ends. 40 00:03:37,310 --> 00:03:43,130 Notice the delimiting character used here see indicated by carat see. 41 00:03:43,160 --> 00:03:47,650 So that's the beginning of the message and end of the message. 42 00:03:47,760 --> 00:03:54,230 So when you use the command Bena question mark you've got the option line which says. 43 00:03:54,270 --> 00:03:59,340 See Bennett text see we see is a delimiting character. 44 00:03:59,400 --> 00:04:03,980 Now you don't typically want to use the letters C as an example. 45 00:04:04,080 --> 00:04:13,740 If I say Benas see and then type something like my cisco router notice I'm taken back to global configuration 46 00:04:13,740 --> 00:04:18,000 mode. 47 00:04:18,200 --> 00:04:26,670 But if we telnet back to routed to you notice the message of the Day message displayed is my C in this 48 00:04:26,680 --> 00:04:33,620 example is the delimiting character so the message was cut off or ended at the latest C.. 49 00:04:33,790 --> 00:04:38,560 Hence only my space was displayed. 50 00:04:38,590 --> 00:04:43,000 What you probably want to use is something like a hash. 51 00:04:43,210 --> 00:04:48,750 Dollar sign or some other character that you're not going to put in your message. 52 00:04:48,820 --> 00:05:00,160 I'll create a basic message such as this so that when we log in we can see which banners are displayed. 53 00:05:00,300 --> 00:05:06,840 I could enter another line such as the following and then continue to into multiple lines. 54 00:05:08,600 --> 00:05:15,530 Hash or pounde indicates in this example that I finish my message and notice I'm taken back to global 55 00:05:15,530 --> 00:05:16,870 configuration mode. 56 00:05:17,950 --> 00:05:20,460 So now we're not telnet to rodded to. 57 00:05:20,860 --> 00:05:25,000 The message is displayed and I can log in. 58 00:05:25,360 --> 00:05:33,210 So the message was displayed before the password prompt on the telnet line. 59 00:05:33,430 --> 00:05:40,130 Whereas previously before the message was created nothing was displayed at this point. 60 00:05:41,770 --> 00:05:47,970 Now a benoît message of the day is also displayed on the console so it doesn't just apply to telnet 61 00:05:48,010 --> 00:05:48,390 lines. 62 00:05:48,400 --> 00:05:55,100 It applies to all lines on the Rodda including what are called TDY lines. 63 00:05:55,380 --> 00:06:03,050 So as an example on this very 6:14 physical Rodda show line shows me that it has a console line. 64 00:06:03,280 --> 00:06:09,640 It has Teotihuacan lines which in this example use four of those Telenet lines and it has Viti 1 lines 65 00:06:09,640 --> 00:06:13,850 which are used for telnet. 66 00:06:14,020 --> 00:06:16,940 So he has a line 97. 67 00:06:17,180 --> 00:06:27,430 When you telnet to a reverse line or TDY line you telnet to port number two thousand and that line number. 68 00:06:27,710 --> 00:06:34,010 So notice here it's displayed the Bena message of the day and I'm actually connected to the console 69 00:06:34,450 --> 00:06:45,430 of a 37 50 switch show line on the 36 40 shows us that line 97 is in use and that's the reverse telnet 70 00:06:45,490 --> 00:06:52,800 connection used on the router to access the core 37 50 switch. 71 00:06:52,810 --> 00:07:02,990 So in other words a better message of the day is displayed on all lines including the console exhilarate 72 00:07:04,510 --> 00:07:09,440 Vittie white lines and T.T. white lines. 73 00:07:09,710 --> 00:07:17,460 Once again on Route 1 I'll telnet to route to notice the Banham message of the day is displayed.