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TOPIC: Reverse Telnet

Reverse Telnet 9 years 11 months ago #17264

  • prasanna
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Hi guys,

Could anyone explain
a. what is reverse telnet. where is it used.
b. NIC loopback Circuitry with regard to CSMA/CD.

Regards
Prasanna.B
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Re: Reverse Telnet 9 years 11 months ago #17266

  • S0lo
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a. what is reverse telnet. where is it used.
Prasanna.B

Some info here

www.cisco.com/en/US/products/sw/iosswrel...9186a00800871ec.html
Studying CCNP...

Ammar Muqaddas
Forum Moderator
www.firewall.cx
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Re: Reverse Telnet 9 years 11 months ago #17298

  • Dove
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Hi,
Reverse Telnet (sometimes called direct Telnet) is the initiation of a Telnet session from a computer system to one of its remote users. Usually, a Telnet session is initiated by a user who wishes to access and share resources on a remote computer system. The user must have permission and is prompted to provide a user name and password.
Reverse Telnet is typically used by a system administrator to configure or to troubleshoot a remote computer.

Dove
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NIC Loopback 9 years 11 months ago #17306

  • TheBishop
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The NIC loopback circuitry is part of the CSMA/CD mechanism in that it allows the NIC to listen to the wire while transmitting so that it can detect collisions. Have a look at the following threads where it's been discussed before:
http://www.firewall.cx/ftopict-1964-nic.html+loopback
and
http://www.firewall.cx/ftopict-2875-nic.html+loopback
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Re: NIC Loopback 9 years 11 months ago #17309

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The NIC loopback circuitry is part of the CSMA/CD mechanism in that it allows the NIC to listen to the wire while transmitting so that it can detect collisions. Have a look at the following threads where it's been discussed before:
http://www.firewall.cx/ftopict-1964-nic.html+loopback
and
http://www.firewall.cx/ftopict-2875-nic.html+loopback

Brillient Bishop, very informative links thanks. I didn't understand the second part of the original question but it all makes sense now :) Long time since i read about CSMA/CD so all good refresh....
Wayne Murphy
Firewall.cx Team Member
www.firewall.cx

Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
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Re: Reverse Telnet 9 years 11 months ago #17358

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Sorry to revive this thread but just reading my BCRAN book to get prepared for the exam and something doesn't add up

In Cisco speak, the reverse telnet means to setup a telnet session where you go down the serial connection to the remote device.

I.e. telnet ip linenumber

If you just telneted to to ip address, the router you were telnetting from who know where the IP Address was and go down the correct serial connection wouldn't it ?

Cheers
Wayne Murphy
Firewall.cx Team Member
www.firewall.cx

Now working for a Security Company called Sec-1 Ltd in the UK, for any
Penetration Testing work visit www.sec-1.com or PM me for details.
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