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Linux - Networking This forum is for any issue related to networks or networking.
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Old 06-25-2003, 08:19 AM   #1
Registered: Feb 2003
Location: England
Distribution: RedHat 9.0, Slackware-Live, LFS
Posts: 31

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Telnet into Cisco router via /dev/ttyS0 (aka COM1 serial port)

hi all,

i'm still relatively new to linux. i'm using slackware-live bootable cd @ college. how do i telnet into a cisco router through the /dev/ttyS0 (COM1 serial port). i can telnet into the router via the eth0 port after assigning the ip address accordingly, however i need this port free for tftp transfers. i've used setserial /dev/ttyS0 command to confirm the serial port has been recognised which it has and reports the following info;
/dev/ttyS0, UART: 16550A, Port: 0x03f8, IRQ: 4

any advice would be helpful
Old 06-25-2003, 02:39 PM   #2
LQ Newbie
Registered: Jun 2003
Posts: 3

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You cant telnet to your cisco using your serial port.
But you can use a terminal program like MINICOM to access and log into your cisco.If you are new to this, MINICOM is something like Hyperterminal on Windows.
You just need to run minicom and set the correct values for the serial port, like speed to 9600, press "F" to turn off Hardware Flow Control.
After that just press enter and you will be preneted with the Cisco Prompt # or asking for login if you configured your cisco device for password protection on serial port.
Old 06-25-2003, 05:33 PM   #3
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Registered: Jun 2003
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You can also use uucp

cu -l ttys0 -s 9600


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