-Go to your internet connection settings.
-Leave everything as it was before until you come to a choice of 3 options
-Click the PPoe
-Enter for the username and password (these are the original ones eircom provide)
username - Eircom@eircom.net
password - Broadband1
-Click auto for everything else
Now you have NAT1/NAT TYPE

pen
I use this setting and it works perfectly
HAPPY GAMING!!!!!!!!!!!!!!