I am using 3Com DSL Modem/Router to access to the Internet with a given public IP address to the ASDL router. I was accessing my mail server through web, but now I could not access it through internet. Would you please advise me the possible cause and also the solution. Please also advise me the configuration related to ADSL router so that users can access some of our computers, switches and other equipment in my network from Internet. We have only one Public IP address.