I have an EdgeRouter Lite that was set up using the wizard. Firnware is v1.9.0. Eth0 is LAN. Eth1 is WAN. Eth2 is unused. Internal addresses are 172.16.0.xx/26. All addresses are manually assigned and there is no DHCP server running on the LAN. When I run SoftPerfect's Network Scanner for a range 172.16.0.1-172.16.0.255 I'm seeing many address hits that must be external based on response times that range from arount 20 to 160 ms. Some hits are within the /26 range ( .1 to .63 ) I use but many are between .81 and .250. Those that have a host name listed all look like Cox equipment (ie., 172.16.0.84 reporting nyrkdspt01.r2.ny.cox.cci).
RFC 1918 says 172.16.0.xx should be unroutable so I'm surprised to see any hits other than my local equipment. Is there a firewall rule or other setting that will fix this?
Thanks.