qr code c# sample 17: IOS Device Management in Objective-C

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17: IOS Device Management
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Some of these options are the same ones used by ping
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1711The CD contains a multimedia demonstration of using the simple and extended traceroute commands on a router Here is an explanation of the other options:
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Turns off a DNS lookup for the names of the routers
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Specifies how many hops the trace is allowed to take
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Tells the router that the hops you specify must appear in the trace path, but other routers can appear as well Restricts the trace path only to those routers that you specify Specifies the number of hops to leave room for in the trace packet
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Strict Record
Timestamp Verbose
Allows you to specify the amount of space to leave room for in the trace packet for timing information Automatically selected whenever you choose any of the options from this question; it prints the entire contents of the trace packet
One important item to point out about the traceroute command is that if more than one path exists to reach the destination, this command will test each path, which can take the trace process longer And like the extended ping command, instead of using the script to perform the test, you can enter the command and all of its parameters on a single command line
The ping command uses ICMP to test layer 3 connectivity to a deviceThe traceroute command
lists each router along the way to the destination and is typically used to troubleshoot routing problems
Layer 7 Connectivity Testing
The ping and traceroute commands can test only layer 3 connectivity If you can reach a destination with either of these two commands, this indicates that layer 3 and below are functioning correctly You can use other tools, such as telnet, to test the application layer If you can telnet to a destination, then all seven layers of the
Basic Troubleshooting
OSI Reference model are functioning correctly As an example, if you can telnet to a machine but can t send an e-mail to it, then the problem is not a networking problem, but an application problem (with the e-mail program) Of course, if you are filtering traffic with an access control list ( 22), this could also be the culprit
The telnet application is used to test layer 7 (application layer) connectivityTo test telnet, the remote destination must have telnet con gured
and enabled If the remote device is an IOS device, you must minimally con gure the login and password commands on the VTYs ( 11)
Using Telnet
If you ve configured your Cisco devices correctly (with IP addressing and routing information and the appropriate commands on the VTYs), you should be able to telnet to them successfully However, if you have followed the advice mentioned earlier in the Remote Access to Your IOS Device section, you might have to test connectivity with SSH instead Cisco routers and switches support both incoming and outgoing telnet and SSH This assumes you have set up the VTYs and configured your IP addressing correctly To open up a telnet session from your IOS device, you can use any of the following three methods:
IOS# name_of_the_destination | destination_IP_address
IOS# telnet name_of_the_destination | destination_IP_address
IOS# connect name_of_the_destination | destination_IP_address
All three of these methods work in the same manner: they all have the IOS attempt to telnet the specified destination As I mentioned in 11, if you mistype a command name from the CLI, the IOS assumes you re trying to use the first telnet method listed above and attempts to resolve the name to an IP address using the local host table, a DNS server, or a DNS broadcastTo stop this behavior, configure the no ip domain-lookup command
17: IOS Device Management
Suspending Telnet Sessions
If you are on an IOS device and telnet to a remote destination, you might want to go back to your IOS device One way of doing this is to exit the remote device; however, you might just want to go back to your source Cisco device, make a quick adjustment, and then return to the remote device Logging off and back onto the remote device is a hassle, in this instance Cisco, however, has solved this problem by allowing you to suspend a telnet session, return to your original router or switch, do what you need to do, and then jump right back into your remote device all without your having to log off and back onto the remote device To suspend a telnet session, use the CTRL-SHIFT-6, X (hold down the CTRL, SHIFT, and 6 keys simultaneously, let go, and then press the X key) or CTRL-^ control sequence, depending on your keyboard On your source IOS, if you want to see the open telnet sessions that are currently suspended, use the show sessions command:
IOS# Conn 1 * 2 show sessions Host Address 10111 10111 10112 10112 Byte 0 0 Idle 1 2 Conn Name 10111 10112
This example shows two open telnet sessions The one with the * preceding it is the default (last accessed) session To resume the last session, all you have to do is press ENTER on an empty command line To resume a specific session, use this command:
Router# resume connection_#
The connection number to enter is the number in the Conn column of the show sessions command As a shortcut, you can just list the number of the connection without typing resume, and this will accomplish the same thing If you are on the source router or switch and want to terminate a suspended telnet session without having to resume the telnet session and then log out it, you can use this command:
Router# disconnect connection_#
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