Does this make any sense?

[TimeKeeper]

I have dynamic IP DSL connection which both my PC can login w/ same user name at the same time.
fig.1
line-> dsl modem-> hub-> two pc

Then I got a NEW linksys switches from a friend. BUT I can't login to DSL anymore, why?
fig.2
line-> dsl modem-> switches-> two pc


Also, if I only share the bandwidth between 2 PC, does it make any differences between hub and switch? (NO, I am not going to spend money on a Router)

thanks....

 

[Damaged]

Because they have the MAC address of the NIC they installed in your system bound to your profile?

Quite possible.