The idea of ISP blocking spoofed IP's

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P

PeterUK

Active member
Oct 30, 2024
26
3
The idea seems sound but just one problem and I think ISP know too and the bad way they are dealing with it. I posted about ISP doing NAT when some of us want are WAN IP.

So like I'm with virgin media with lets say a IP of 92.239.64.2 If some how I was to send from the same MAC source IP 4.79.142.200 to target thats what you want to block but nothing is stopping attackers from using other IP in the same subnet like 92.239.64.222 and to a ISP that would look valid but really coming from 92.239.64.2.

So how do you deal with that? Well ISP taking the dirty way out by them doing NAT that stops spoofing the real solution is DAI (Dynamic ARP Inspection) on the modem but it seems ISP want the cheapest way out and so NAT...doubt NAT..I hate.
 
Better would be for them to block any outgoing requests that come from an internal IP, but the IP in the packet as source is not in the ISP assigned range. That would stop a lot of spoofing and DDos attacks, as the ISP will be able to track the sudden flood of traffic to a single sourceand be able to see if it is maware, and either notify the souce clients or rate limit the requests before passing them out.
 
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