I have had my ASA 5505 running for few months now on Virgin Media FTTN (Fibre To The Neighbourhood / Node) connection and thought I’d share my config. When initial configuration was done on ASA it was a royal pain to be honest, moving from ZyXEL ZyWALL 5 device was challenging since Cisco like to do things differently and ASA is no exception. Here’s what I’m currently running software wise:

ASA software version 8.4.3 and ASDM 6.4.7 – both seem fairly stable so far.

You can safely ignore any defined objects, access lists etc. in the config below as you’d need to re-create them based on what’s required by you.
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