I get a new fdxx everytime I reflash and boot my test board....  (this is on my dev host on the same network segment)

3: enp0s20f0u2u1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 48:2a:e3:66:23:ad brd ff:ff:ff:ff:ff:ff
    inet 192.168.3.124/24 brd 192.168.3.255 scope global dynamic noprefixroute enp0s20f0u2u1
       valid_lft 33784sec preferred_lft 33784sec
    inet6 fdc4:e2f4:cd::76b/128 scope global dynamic noprefixroute 
       valid_lft 10818sec preferred_lft 10818sec
    inet6 fdc4:e2f4:cd:0:cd0d:a6b2:11e9:9b86/64 scope global noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fd38:1315:5a53:0:c0d8:9b24:23c:c356/64 scope global noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fd9c:d571:444c:0:630e:a5b9:6620:e7e0/64 scope global noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fd16:b796:35e6:0:f563:4bc:4433:ac08/64 scope global noprefixroute 
       valid_lft forever preferred_lft forever
    inet6 fe80::492:9dfb:9a3d:b782/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever