In book TAKEDOWN by Tsutomu Shimomura, author talks about connecting to his computers from outside using the dial-up modem connected to his home computer while his computer is running a T1 connection ( or broadband ?). He puts a dial-up modem between his computer and the internet and then talks securely to it. I want to do the same.

My configuration is like this:

and I want to login into it using some dial-up modem:

I know how to SSH into my system but because of dynamic IP provided by my ISP, it keeps on changing. I only want to do this because the author said, its a secure method to remotely login into your computer and do what you want. and 2nd, I will not have to search for what is my IP every time

Does anyone has any idea about this ?

A better method would be to get a dynamic DNS address. My ADSL modem has a facility to automatically update the dynamic DNS address with the IP address from my ISP when it connects.

Agree...been using this for years....never a problem..

Please remember this book was written in 1996, about events that occurred prior to 1996. Things have changed quite significantly since 1996, let alone since when the actual events occurred...

Like the other posters here I would suggest that you use a dynamic dns service, your router supports it in all likely hood and if not then you can get a dynamic dns client for your Linux machine.

If you are dead set on the idea of being able to access your computer via dial-up (it's a nice idea for when your internet connection is down and you want to troubleshoot it remotely) then I would suggest hooking a modem up to the machine and setting it up to accept connections from outside automatically via mgetty/pppd.

Hope the information helps.

h.. no, that thought never came to my mind .

The ISP I am planning to take on distributes static IPs only. You mean I can install some software on Linux that will make it behave like a Dynamic IP (changing IPs on every modem boot) ?

If thats old & no gold, then drop it . I feel much better with ADSL though. Me and my friends have played this SSH game a lot. The only thing that I was always unable to do was, I was logging into my machine (SSH server) from Windows (PuTTY SSH client) but I did not know how to copy files from my home machine to Windows or vice-versa

If you have a static address you have a static address. If you have a dynamic address you have a dynamic address. What a dynamic dns client does is automatically updates a known dns entry (for example, yourname.dyndns.org) every time you are issued a different dynamic address, so you are always able to access the machine using the known dns entry even if the ip address changes.

An example:

Your computer receives an address from dhcp of 1.2.3.4 dyndns sets arnuld.dyndns.org to 1.2.3.4.

You can ssh to arnuld.dyndns.org and connect.

Two hours later your computer receives a new address of 1.2.7.1 from the router and the dyndns sets arnuld.dyndns.org to 1.2.7.1

You can still ssh to arnuld.dyndns.org and connect because everytime address changes the dyndns client updates the dns entry for you.

Hope that explains everything.

that's how it works for me........
for file transfer there are many progs that use ssh and almost look like wfpt or sftp