I want to use my office account at my home. I have user name and
password of my office account.
When i change the modem using it user+pass,  i can not connect again
to internet. I am using ADSL connection.

If I am using a torrent downloading program like Bitlord and I set up
my router to forward the ports like the programs tell me, I completely
lose my internet connection after about 15 min or so.
If I do not forward ports, it runs fine, although not very fast.

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Can anyone tell me, how to write such a program that can transfer
files (either binary or text) behind NAT devices( such as for
computers behind firewalls and routers and other NAT devices) using
TCP socket programming.