It should not start after installation, because there is no configuration file: In my little KVM test lab, I installed it on Ubuntu, apt-get install radvd. You should install radvd on a dedicated router for production use, but for testing you can install it on any Linux PC on your network. Before you change anything, run ifconfig or ip addr show to see your existing IP addresses. ULAs are not automatic like link-local addresses, but setting up auto-configuration is easy as pie with radvd, the router advertisement daemon. Which should be simple, just block the whole fd00::/8 range on your border devices. ULAs are for private networks only and should be blocked from leaving your network, and not allowed to roam the Internet. You can mix global unicast addresses and ULAs on the same network, but I can’t think of a good reason to have both, and for darned sure you don’t want to use network address translation (NAT) to make ULAs publicly accessible. If you have an allocation from a service provider then you don’t need ULAs. Two, you control ULAs choose your own addresses, make subnets, and they are routable.Īnother benefit of ULAs is you don’t need an allocation of global unicast IPv6 addresses just for mucking around on your LAN. One, link-local addresses are not routable, so you can’t cross subnets. So what’s the point of ULAs, especially when we have link-local addresses (fe80::/10) and don’t even need to configure them? There are two important differences. IPv6 isn’t just bigger IPv4 it is different and needs different thinking. IPv6 supports NAT, but I can’t think of a good reason to use it. IPv4 private address classes and network address translation (NAT) were created to alleviate the shortage of IPv4 addresses, a clever hack that prolonged the life of IPv4 for years after it should have been replaced. But they are not intended as a direct replacement. Unique local addresses use the fd00::/8 address block, and are similar to our old friends the IPv4 private address classes: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16. ![]() In this article, we will learn how to set up automatic IP address configuration for ULAs. ![]() In Testing IPv6 Networking in KVM: Part 1, we learned about unique local addresses (ULAs).
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