The notation in that case is to encode the IPv6 IP number in square brackets: http://[2001:db8:1f70::999:de8:7648:6e8]:100/ That’s RFC 3986, section 3.2.2: Host A host identified by an Internet Protocol literal address, version 6 [RFC3513] or later, is distinguished by enclosing the IP literal within square brackets (“[” and “]”). This is the only place where … Read more
That probably is about the only reason you would use the former construct, these days. The reason you’re seeing this is probably that the default of ipv6only changed in nginx 1.3.4. Prior to that, it defaulted to off; in newer versions it defaults to on. This happens to interact with the IPV6_V6ONLY socket option on … Read more
First and foremost, there is nothing to fear from being on a public IP allocation, so long as your security devices are configured right. What should I be replacing NAT with, if we don’t have physically separate networks? The same thing we’ve been physically separating them with since the 1980’s, routers and firewalls. The one … Read more
The first thing that should be mentioned about IPv6 subnetting is that a different mode of thought is called for. In IPv4 you usually think about how many addresses you have available and how you can allocate enough of them to each end user. In IPv6 you usually think about how many /64–subnets you have … Read more
I’m having trouble writing a regular expression that matches valid IPv6 addresses, including those in their compressed form (with :: or leading zeros omitted from each byte pair). Can someone suggest a regular expression that would fulfill the requirement? I’m considering expanding each byte pair and matching the result with a simpler regex.
I have vps with ipv6, such as I don’t understand meaning of /64. Does it mean that my vps has more than one ipv6 adress ?
As we all know that IPv4 address for localhost is 127.0.0.1 (loopback address). Actually, any IPv4 address in 127.0.0.0/8 is a loopback address. In IPv6, the direct analog of the loopback range is ::1/128. So ::1 (long form 0:0:0:0:0:0:0:1) is the one and only IPv6 loopback address. While the hostname localhost will normally resolve to 127.0.0.1 or ::1, I have seen cases where someone has bound it to an IP … Read more
http://en.wikipedia.org/wiki/Hexspeakhttp://www.urbandictionary.com/define.php?term=dead%3Abeef “Dead beef” is a very popular sentence in programming, because it is built only from letters a-f, which are used in hexadecimal notation. Colons in the beginning and in the middle of the sentence make this sentence a (theoretically) valid IPv6 address.
While there are IPv6 equivalents for the IPv4 address range, you can’t convert all IPv6 addresses to IPv4 – there are more IPv6 addresses than there are IPv4 addresses. The only sane way around this issue is to update your application to be able to understand and store IPv6 addresses.