In a small environment, we are connecting to the internet by using a VDSL modem. Usually all clients from this ISP is behind cgNAT but for our case we have purchased static IP so we directly have a IP address assigned to me.
In firewall logs I am observing "TCP connection dropped - packet did not match policy WAN to WAN" logs. When I checked the IP's by using IP Whois, source IP of this connections are mostly from the ISP's IP range. So I wanted to know, why I am receiving packets or connections from other customers of my ISP? Is it an expected behavior? I can understand LAN to WAN or WAN to LAN packets, but what is the case with WAN to WAN packets?
Thanks a lot.
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