Hi! One part of my application is in charge of modifying the network configuration through the SystemConfiguration library. More specifically, I temporarily add entries under State:/Network/Service/Temp/DNS State:/Network/Service/Temp/IPv4 State:/Network/Service/Temp/IPv6 And then remove them when I'm done, expecting the network configuration to return to the one active before this procedure. I have noticed (at least in macOS Catalina) that the Default IPv6 route does not get properly restored if I do this. I can get it back by turning Off and On the network adapter, but I believe that should normally not be necessary. The steps to reproduce this are: 1) Configure a manual IPv6 address for the network adapter, for example: Router: 2001:db8:abcd:12::1 Address: 2001:db8:abcd:12::7 Prefix Length: 64 2) Check that the default IPv6 route is present through 'netsat -nr' language Internet6: Destination               Gateway             Flags     Netif Expire default                 2001:db8:abcd:12::1       UGc       en0     default                 fe80::%utun0          UGcI     utun0     default                 fe80::%utun1          UGcI     utun1     3) Add an IPv6 entry using scutil language d.init d.add Addresses * 2001:db8:abcd:12::7 d.add InterfaceName en0 d.add PrefixLength * 64 d.add Router 2001:db8:abcd:12::1 set State:/Network/Service/Temp/IPv6 4) Default IPv6 route is still present language Internet6: Destination               Gateway             Flags     Netif Expire default                 2001:db8:abcd:12::1       UGc       en0     default                 fe80::%utun0          UGcI     utun0     default                 fe80::%utun1          UGcI     utun1     5) Remove Temp entry language remove State:/Network/Service/Temp/IPv6  6) Default IPv6 route is gone language Internet6: Destination               Gateway             Flags     Netif Expire default                 fe80::%utun0          UGcI     utun0     default                 fe80::%utun1          UGcI     utun1     7) Restart network adapter 8) Default IPv6 route reappears language Internet6: Destination               Gateway             Flags     Netif Expire default                 2001:db8:abcd:12::1       UGc       en0     default                 fe80::%utun0          UGcI     utun0     default                 fe80::%utun1          UGcI     utun1     So, I wanted to know if I'm correctly assuming that the default route should not disappear after removing the IPv6 entry, and if there's any workaround I could use from within my application other than manually restarting the network adapter. Thanks!