How to update antivirus data behind a firewall ?

  • Dear All

    How do I do that block everything but anti-virus program update its virus pattern?
    I want to make a rule that computers in LAN can NOT access to internet, but they can update its anti-virus software?
    any suggestions can give me?
    Thank you!

    ps: if my anti-virus is avira antivir pro.

  • Find a list of all IPs of antivir-servers.
    Create an alias, containing all these IPs.
    Allow this alias.

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