Lab 6: Configuring Remote Access to the Lab-Part II

Lab 6: Configuring Remote Access to the Lab ”Part II

Lab Walkthrough

The first step in configuring Skynet is to attach the routers and the modem as indicated in Figure 1-18. After attaching all the physical devices, verify what absolute line they exist on through the show line command, as demonstrated in Example 1-56. Note the column on the left side ”the asynchronous lines are the ones denoted as TTY.

Example 1-56 The show line Command Performed on the Access Server

 Router#  show line  Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int *  0 CTY              -    -      -    -    -      0       0     0/0       -    1 TTY   9600/9600  -    -      -    -    -      0       0     0/0       - *  2 TTY   9600/9600  -    -      -    -    -      0       1    37/110     - *  3 TTY   9600/9600  -    -      -    -    -      0       1     3/11      -    4 TTY   9600/9600  -    -      -    -    -      0       1     0/0       -    5 TTY   9600/9600  -    -      -    -    -      0       1     0/0       -    6 TTY   9600/9600  -    -      -    -    -      0       1     0/0       -    7 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -    8 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -    9 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   10 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   11 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   12 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   13 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   14 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   15 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   16 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   17 AUX   9600/9600  -    -      -    -    -      0       0     0/0       -   18 VTY              -    -      -    -    -      0       0     0/0       -   19 VTY              -    -      -    -    -      0       0     0/0       -   20 VTY              -    -      -    -    -      0       0     0/0       -   21 VTY              -    -      -    -    -      0       0     0/0       -  Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int   22 VTY              -    -      -    -    -      0       0     0/0       - Router# 

Lines 1 through 4 are the TTY lines to which you have attached the routers. Therefore, you need to add the following to these lines:

• transport input all

• no exec

To make reverse Telnet sessions easier to open, you add a host table for each router, pointing to ports 2001 through 2004. To facilitate the reverse Telnet session, you also need to add a loopback interface. Example 1-57 shows the configuration of skynet_access.

Example 1-57 Initial Configuration of the Access Server Called skynet_access

 Router#  conf t  Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#hostname skynet_access  skynet_access(config)#    interface loopback 0     Configuring the   skynet_access(config-if)#    ip address 201.201.201.1 255.255.255.0      loopback   interface  skynet_access(config-if)#  exit  skynet_access(config)#  skynet_access(config)#    ip host r1 2001 201.201.201.1     Configure the IP   skynet_access(config)#    ip host r2 2002 201.201.201.1     host table  skynet_access(config)#  ip host r3 2003 201.201.201.1  skynet_access(config)#  ip host r4 2004 201.201.201.1  skynet_access(config)#  ip host modem 2005 201.201.201.1  skynet_access(config)#  skynet_access(config)#    line 1 4     Configuring the   skynet_access(config-line)#    transport input all     the line entries to   skynet_access(config-line)#    no exec     support telnet  skynet_access(config-line)#  ^Z  skynet_access# 

To complete the lab, you must configure Line 5 for a modem. To accomplish this task, add the following to Line 5:

• transport input all

• modem inout

• modem autoconfigure discovery

In Example 1-58, you add the preceding commands to Line 5. Be sure to also include an enable password ”without this, the remote session will not be capable of entering privilege mode to configure the router.

After adding the new commands, perform the show line command, followed by the show line 5 command. In the resulting output, look for Line 5 to be configured as a modem. Also ensure that the modem is correctly configured and that CTS is detected .

Example 1-58 The Line Configuration for a Modem and show line Command in Use

 skynet_access(config)#  skynet_access(config)#    enable password cisco     Allows privileged access  skynet_access(config)#  line 5   skynet_access(config-line)#    transport input all     Allows terminal sessions   skynet_access(config-line)#    modem inout     Configures the modem   skynet_access(config-line)#    modem autoconfigure discovery     for autodetection  skynet_access(config)#  ^Z  skynet_access# skynet_access#  show line  Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int *  0 CTY              -    -      -    -    -      0       0     0/0       -    1 TTY   9600/9600  -    -      -    -    -      0       0     0/0       - *  2 TTY   9600/9600  -    -      -    -    -      0       1   145/437     - *  3 TTY   9600/9600  -    -      -    -    -      0       1   109/328     -    4 TTY   9600/9600  -    -      -    -    -      0       1     0/0       -    5 TTY 115200/115200- inout     -    -    -      0       1     0/0       -    6 TTY   9600/9600  -    -      -    -    -      0       1     0/0       -    7 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -    8 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -    9 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   10 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   11 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   12 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   13 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   14 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   15 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   16 TTY   9600/9600  -    -      -    -    -      0       0     0/0       -   17 AUX   9600/9600  -    -      -    -    -      0       0     0/0       -   18 VTY              -    -      -    -    -      0       0     0/0       -   19 VTY              -    -      -    -    -      0       0     0/0       -   20 VTY              -    -      -    -    -      0       0     0/0       -   21 VTY              -    -      -    -    -      0       0     0/0       -  Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int   22 VTY              -    -      -    -    -      0       0     0/0       - skynet_access#  show line 5  Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int    5 TTY 115200/115200- inout     -    -    -      0       1     0/0       - Line 5, Location: "", Type: "" Length: 24 lines, Width: 80 columns Baud rate (TX/RX) is 115200/115200, no parity, 2 stopbits, 8 databits Status: No Exit Banner, Modem Detected Capabilities: Modem Callout, Modem RI is CD, Modem Discovery Modem state: Idle Group codes:    0 Modem hardware state: CTS noDSR  DTR RTS, Modem Configured Special Chars: Escape  Hold  Stop  Start  Disconnect  Activation                 ^^x    none   -     -       none Timeouts:      Idle EXEC    Idle Session   Modem Answer  Session   Dispatch                00:10:00        never                        none     not set                             Idle Session Disconnect Warning                               never                             Login-sequence User Response                              00:00:30                             Autoselect Initial Wait                               not set Modem type is usr_sportster. Session limit is not set. Time since activation: never Editing is enabled. History is enabled, history size is 10. DNS resolution in show commands is enabled Full user help is disabled Allowed transports are lat pad v120 mop telnet rlogin nasi.  Preferred is lat. No output characters are padded No special data dispatching characters skynet_access# 

When the configuration is complete, you can test it by making an analog connection by using HyperTerminal or another terminal emulator, such as ProComm.

From this point on, the configuration of the access server will remain fairly static. You should have access to all the routers in the stack through reverse Telnet, along with analog access to the lab.

You now should have the groundwork necessary to begin practical studies in internetworking.