Reply to post: ASN blocking, not individual IP, is the way to go

Microsoft accused of sharing data of Office 365 business subscribers with Facebook and its app devs


ASN blocking, not individual IP, is the way to go


If I have understood your intentions correctly, I think that blocking individual Microsoft IP addresses will be akin to "wack a mole" much better to block at the ASN level.

As indicated in my original post one of the third party packages I use in pfsense is called pfblockerNG (pfBlockerNG-devel v2.2.5_33) which allows DNS and ASN blocking. Amongst its killer features is it will automatically check and update ASN lists so as additional subnets are added/removed from an ASN it will update the firewall block lists without any further intervention.

Looking at my firewall logs this morning (post Windows 10 VM boot) I can see the following IP addresses (all Microshaft) on port 443 blocked

These are different from those I listed yesterdays and would not be blocked via DNS (no entries listed for IP's)

Personally, if you can, I would recommend switching to pfsense full stop. It is very sophisticated and also free open source software! While pi-hole is good (and has a very low hardware requirement) pfsense is IMHO streets ahead in functionality.

For pfsense higher specification hardware will be required but its still relatively modest. I use an Intel NUC (see here which is powered by a 36w supply. Whatever hardware you use for pfsense its strongly recommended that it has Intel NIC’s and AES-NI on the chipset.

Frankly (whilst I am only a home user) I would feel naked without pfsense. Its also excellent for configuring VPN inbound/outbound connections.

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