My ISP bring internet connection on fiber link , it is tested when i plug the link to my laptop with all the IP address but if i connect to my ASA firewall 5510 which is 10/100 it will fail. they are suggesting that the fiber link only support on a GIgabit port. I cannot understand that if it works on a laptop LAN on 10/100.
Are you absolutely certain the laptop connection is working at 10/100?? Most laptops for some years have had 10/100/1000 Lan ports as standard. Since the ISP signal is coming in on fiber, how do you get a copper network cable connection to plug into the laptop? What kind of media conversion are you using?