In my network, I created an alias for all of the ports I have open on my server so that I can create firewall rules to allow several of my VLANs to access the services hosted on my server. The benefit of creating an alias is that I do not need to create 4 separate firewall rules to open 4 different ports to my server and then repeat this process for each VLAN I need to allow access (yes, you could use floating rules or rule groups depending on the order you need rules to be processed).
Cable Haunt is a recent vulnerability that has been found in over 200 million cable modems in Europe and likely many more in other countries as well. Many modern modems use similar Broadcom chipsets and used the same reference firmware which contained the vulnerability. Because of this, the impact of this vulnerability is much greater than it would have been otherwise. Software running in many (probably nearly all) consumer modems have not implemented best practices for security.
Having an offline local network with no Internet access can be useful for a number of reasons. A few that come to mind are home lab networks, non-cloud IoT device networks, and “closed circuit” IP security camera network. For my network, I set up a separate offline IP security camera network using Amcrest IP cameras (affiliate link) as a baby monitor system. The quality is so much better and it is more secure than traditional baby monitors because I can lock down access from outside users.
IPv6 was drafted in the mid-1990s when it was realized that IPv4 addresses would quickly be exhausted due to the explosive growth of the Internet. Since the IPv4 protocol was originally a research project, approximately 4.3 billion unique IP addresses was considered more than enough. I doubt many imagined our current world where nearly everything would be connected to the Internet. Various techniques such as assigning smaller sized networks to organizations and the utilization of NAT (Network Address Translation) helped extend the time before IPv4 addresses would be exhausted.
If you are new to firewalls like I was when I decided to build my own router/firewall, it can take some time to fully understand and feel comfortable implementing firewall rules. Before attempting to build my own router, I tried to do my research so I would know what I was getting myself into. In particular, I read several posts and watched some videos on how to create firewall rules since that is one of the biggest reasons I was taking on such a project – to implement greater security in my home network.