Sunday, June 27, 2021

100.64.0.0/10 on my LAN?

Hey everyone,

While perusing my firewall logs earlier, I found some traffic logs from an end-user device (iphone) -> 100.125.X.X which falls under the 100.64.0.0/10 reserved address space. It's my understanding that 100.64.0.0/10 is a reserved shared address space typically used in an ISP network and isn't publically routed, so I'm trying to understand why I might be seeing this traffic?

I wouldn't think much of it if I saw this inbound on wan. I would have just assumed something funky was happening ISP-side, but the fact that it is outbound from an iphone threw me for a loop.

Any ideas?



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