Ubuntu 9.10 unexpected internet behavior

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http://www.linuxquestions.org – I use DSL Broadband connection with all the IP and DNS settings. I realized that Sometimes when I start my system, internet works and sometimes it doesnt although wired connection is enabled on eth0. I gota restart many times then slowly internet starts. But if I boot from pendrive the same ubuntu 9.10 catches internet without any IP or DNS settings! COOL ISN'T IT? But on my hard disk installed system the same ubuntu 9.10 shows disconected network on eth0 if I dont give IP and DNS settings. I would like to mention that i installed ubuntu 9.10 from pendrive itself and also that there are no IP conflicts with other PC. Its not a big problem but i want to learn whats the deal here. -Thank already (HowTos)