Your anti-virus says you are attacked by Proximus: why?

If your anti-virus or firewall notifies you of attacks coming from Proximus or Skynet, what does it mean?

• "Proximus attacks": a firewall keeps an eye on all Internet connections coming into your computer, ready to shut out any unwanted intruders. Sometimes legitimate connections from your provider or other parties may also be detected or blocked, such as the traffic from our DNS server (195.238.2.21 and 195.238.2.22 addresses). However, make sure that you do not block these addresses, otherwise your Internet connection will no longer function correctly.
• "Skynet attacks": it is also possible that the "attack" originates from another Proximus user, e.g. one with an address the ends with adsl.skynet.be. If you suspect that another user is trying to break into your system, we advise you to contact us.