Archives for posts with tag: ULA

IPv6 ULAs have a global scope, so when it comes to a default address selection in IPv6, longest prefix match criteria is used to chose a proper source IPv6 address to speak with the remote site within the same (global) scope.

I’ve discussed scopes and zones in one of my recent posts. I’ve mentioned IPv6 ULA in that context which was somehow misleading and well spotted in a comment by Roger Wilco, saying “Strictly speaking, ULA have global scope, and so the scope and zone math shouldn’t be required to be able to explain why an IPv6 host can want to speak with a remote globally routed address from a local ULA.” Absolutely true! Read the rest of this entry »

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When it comes to ULA, IPv6 gurus get nervous. Some hear NAT, and NAT is the most disgusting word in IPv6 vocabulary.

Well, ULA is not to be NAT-ed (look for Ivan’s ipSpace posts about ULA for more know-how), it can be used in a much smarter way – it can provide an internal connectivity in case when a site gets isolated from its basic networking services like DHCPv6, for example. Yes, these things can happen. Read the rest of this entry »