IPv6 is the newest version of the Internet Protocol. It is designed to supersede IPv4 as it offers many more addresses.

learn more… | top users | synonyms

119
votes
2answers
28k views

How to avoid exposing my MAC address when using IPv6?

On my Macs, each IPv6 address includes the MAC address of a specific computer (not of my router). Sites such as ipv6-test.com not only show it, but even tell me it belongs to an Apple computer. This ...
72
votes
3answers
38k views

Why is there a percent sign '%' in the IPv6 address?

I am using the .NET Framework classes to get the IP addresses for my machine. Dns.GetHostAddresses(Dns.GetHostName()) I have a VirtualBox adapter which has both an IPv4 and IPv6 address. Using the ...
52
votes
7answers
81k views

Is there any benefit to using IPv6 on my home network?

I know that IPv6 is the future because there is only 4 billion IPv4 address, but on a home network, you are not going to have 4 billion users. So are there any other benefits that would make IPv6 on a ...
37
votes
2answers
37k views

How to connect a website has only IPv6 address without domain name?

If a server has only IPv6 address without domain name, how can I connect to server from my web-browser?
36
votes
4answers
117k views

Windows Update doesn't work and consumes 100% of CPU (Win7 SP1) [duplicate]

I've observed a strange behaviour with Windows Update (Win7 SP1). The process svchost is consuming an entire core of my Virtual Machine (VirtualBox) doing nothing (i.e., there is no network traffic ...
33
votes
7answers
64k views

Is IPv6 'faster' than IPv4?

Are there any practical speed/latency gains from using IPv6, or is it just to make room for more IPs?
33
votes
2answers
5k views

Why is ARP replaced by NDP in IPv6?

ARP was replaced by the NDP (Neighbour Discovery Protocol). But I don't know the exact reason for this. Are there any security issues in ARP? Why ARP is replaced by NDP? What are the advantages of ...
28
votes
3answers
40k views

What is the relevance of “fe80::1%lo0 localhost” in /etc/hosts?

Following are the entries in my /etc/hosts. I was wondering what is the last entry (fe80::1%lo0 localhost) for. 127.0.0.1 localhost 255.255.255.255 broadcasthost ::1 localhost fe80::1%lo0 localhost
27
votes
4answers
3k views

What's the responsibility of an IPv6 owner?

Living behind a consumer-grade router for the memorable past, I guess I took the side-effect of NAT for granted, in that I had the burden of forwarding ports when I needed to, instead of have to ...
26
votes
3answers
63k views

how to ssh to a ipv6 ubuntu in a LAN?

I'm able to ping my Ubuntu box via command: (where c2h2ttt is listed in /etc/hosts) c2h2@c2h2crawler:~/ttt$ ping6 -I eth1 c2h2ttt PING c2h2ttt(c2h2ttt) from fe80::21b:21ff:fe22:e865 eth1: 56 data ...
25
votes
4answers
4k views

Why does the “Internet of Things” enforce the need for IPv6 addresses?

If you have multiple devices in one network, the amount of IPv4 addresses will not increase linearly to accomodate the number of devices. There is just one IPv4 address per Network/Router that is ...
24
votes
1answer
58k views

How to force Java to use IPv4 instead IPv6?

My Java browser plug-in is no longer working. When I open a page that has a Java element, Java cannot connect to the server. After investigation, I found that Java was trying to use IPv6, while my ...
21
votes
10answers
198k views

Why do I get “General Failure” when pinging host name on a Win 7 node on the network?

This is a very peculiar problem with a station on our network. The client pc is running Windows 7 Pro. What makes this problem interesting is that this client is the only node on the network that ...
19
votes
2answers
3k views

Can a domain name have both IP addresses (IPv6 and IPv4)?

Can a domain name (example.com) have both the IP addresses, IPv6 and IPv4? Which IP address does a domain name have? IPv6 or IPv4? But I am not sure that it has both or any one at a time.
19
votes
3answers
24k views

How can I get Firefox/Chrome to reach IPv6 websites?

I have been experimenting with IPv6 using a Windows7 client with the default Teredo IPv6 tunnel enabled. I can reach IPv6 hosts (ipv6.google.com & www.v6.facebook.com) successfully using PING -6....
18
votes
3answers
61k views

IPv4 vs IPv6 priority in Windows 7

I have IPv6 connectivity through Hurricane Electric tunnel. Since IPv6 day this year, many services (google.com, facebook.com, etc.) enabled IPv6 on their main domains. On my Windows machine, IPv6 is ...
18
votes
2answers
52k views

What are the differences between the IPv6 options in AirPort Utility?

In AirPort Utility, my Time Capsule has under Manual Setup->Advanced->IPv6 the options Link-local only, host, and tunnel. What are the differences between these options, and which one should be used ...
18
votes
3answers
9k views

Which home router support IPv6?

Which routers suitable for small/home networks support IPv6 as described in the Microsoft document IPv6 Support in Home Routers? Edit: to answer some comments wondering about the reasons of wanting ...
17
votes
7answers
25k views

What interesting uses for IPv6 are out there? [closed]

IPv6 is reasonably easy to setup these days via 6to4 tunneling, but once done, what does one do with it? What interesting services are out there already using IPv6 or providing exclusive features over ...
17
votes
4answers
62k views

How to disable ipv6 on a specific interface in linux?

Could someone tell me how to disable ipv6 auto-config on a specific network interface in CentOS? The current situation is: A PC has two network adapters eth0 and eth1 that are connecting to the same ...
16
votes
3answers
35k views

How to disable autoconfiguration on IPv6 in Linux?

How can I permanently disable autoconfiguration of IPv6 in Linux? When I try to manually delete an address from an interface with: ip -6 addr del 2001:0db8:85a3:0000:0000:8a2e:0370:7334/64 dev eth1 ...
15
votes
4answers
31k views

Is there a way to disable IPv6 in Google's Chrome?

I'm developing websites in a Windows 7 machine. When I've installed Firefox I've found some performance issue specially on connecting to the localhost, googling around I've discovered that it's ...
14
votes
3answers
4k views

How do I ping localhost using IPv6?

I'm trying to understand IPv6 better. Firstly, I try ifconfig, and I get the following: eth0 Link encap:Ethernet HWaddr XXXXXXX inet addr:X.X.X.X Bcast:X.X.X.X Mask:XXXXXXXXX ...
14
votes
2answers
66k views

How to disable IPv6 on Debian Wheezy?

I know there's a wiki entry http://wiki.debian.org/DebianIPv6#How_to_turn_off_IPv6 that shows how to disable IPv6 in Debian Squeeze, but that's a 2.6.* kernel. What about 3.2.* kernels running ...
13
votes
3answers
2k views

I have both IPv4 and IPv6 public addresses. Why?

For my home network, my public IP address shows through some websites as an IPv4 and others as an IPv6 address. I have read this thread and understand that it is possible for my ISP to have assigned ...
13
votes
3answers
986 views

What is IPv6 and why should I care?

What is IPv6 and why should I care? Bonus points for easy instructions for jumping into the bandwagon.
13
votes
2answers
7k views

How do I know if my router supports IPv6?

$ ping6 :: PING ::(::) 56 data bytes 64 bytes from ::1: icmp_seq=1 ttl=64 time=0.046 ms 64 bytes from ::1: icmp_seq=2 ttl=64 time=0.053 ms 64 bytes from ::1: icmp_seq=3 ttl=64 time=0.058 ms ^C --- :: ...
13
votes
2answers
5k views

How will home networks work in the IPv6 world?

Right now, I have a home network setup behind a Netgear router. That router has a public IP address I get from Comcast. I also have a computer setup on my home network running Linux that runs a DHCP ...
12
votes
3answers
8k views

How do client applications know to use IPv4 or IPv6?

How do servers/computers/users/applications know to request a resource over the Internet with an IPv6 address vs. and IPv4 address?
11
votes
5answers
3k views

Does NAT provide security?

I'm following discussions about the IPv4->IPv6 transition, and IPv6 doesn't seem to like NAT at all. I've always thought that NAT was helpful in v4 for some security, I know it doesn't really hide ...
11
votes
2answers
6k views

DD-WRT with native IPv6

My ISP provides native IPv6 support (ie. I can plug in my computer straight into the WAN and get an IPv6 address). However I can not get this working on DD-WRT. When I enable IPv6 and radvd in DD-...
10
votes
2answers
5k views

Using only AAAA record for a domain?

Can I point a domain to IPv6 only, instead of IPv4 and will it be fully functional? I've searched for a tip on the Internet, but I've found only for using both.
10
votes
3answers
2k views

What do the numbers used in a IPV6 address mean?

I am trying to understand IPV6. I have a server with the following IPV6 address: 2607:f750:0:3f::f59. I don't understand what the numbers mean. It looks totally different from an IPV4 address. ...
10
votes
2answers
8k views

How can I use curl with ::1 for ipv6 based loopback?

I tried a few ways but they seem to be confusing curl. root@testt:~# curl localhost:8080 <h1>Hello world!</h1> <p>Boom Bam Splat</p> root@testt:~# curl ::1:8080 curl: (3) ...
10
votes
2answers
8k views

Can IP v4 and IP v6 share a single physical Ethernet?

I keep reading about the transition from IP v4 to IP v6, and the possible advantages and problems. One thing that keeps popping up is "dual-stack" networking, meaning (I believe) a host can speak both ...
10
votes
2answers
7k views

Why does my Windows have hundreds of temporary IPv6 addresses?

My ISP enabled IPv6 for me a few weeks ago. Now I noticted that Windows (8.1) gets a lot of temporary IPv6 addresses. ipconfig has the following output (real addresses are obfuscated): Windows IP ...
10
votes
2answers
6k views

How can I setup an IPv6 network in this way?

I have a network mapped like this : To experiment with IPv6 connectivity, I want to configure my LAN network using IPv6. Can someone explain how to convert the connection between the Desktop and ...
9
votes
2answers
3k views

How will IPv6 impact everyday users? (World IPv6 Day)

With the current (one hour in at the moment) trial by all the big boys (Google, Facebook, Bing, Yahoo, etc.) I wondered how IPv6 will effect home users and the Internet as a whole. Will the change ...
9
votes
4answers
3k views

I have IPv6. Why does my connection to the Windows Store fail?

I recently installed Windows 8, and I am unable to access the Store. I receive the error: We weren't able to connect to the Store. This might have happened because of a server problem or the ...
9
votes
1answer
3k views

Back to My Mac registers services using loopback interface IPv6 address

I'd like to be able to use Back to My Mac over the IPv6 internet. I've already got IPv6 access (i.e. My Airport is assigned a /64 block from my ISP and sends out RAs so everyone on the network can ...
9
votes
4answers
2k views

4in6 tunneling (via OpenVPN?)

I have a local network with internet access. But unfortunately IPv4 internet connection speed is limited to 1mbps, which is realy sad. Fortunately I have a native IPv6, and there is no connection ...
8
votes
8answers
2k views

IPv6 for home users

What is the best way to use IPv6 if you are a home user. I have a number of vista/ws2k8/w7 machines at home, but they are behind a NAT firewall which is not IPv6 compliant! How can they be attached ...
8
votes
4answers
11k views

Are there any wireless IPv6-ready home routers? [closed]

Checked the router we have at home (D-Link DIR-655) and doesn't seem like it supports IPv6. Got curious; Are there any? It would have to support bridging to IPv4 on the outside though, since the ISP ...
8
votes
2answers
3k views

Can we disable IPV4 and use purely IPV6 on Windows XP/2003?

Is there any way we can use purely IPV6 on Windows XP or Server 2003. I know an IPV4/IPV6 dual stack exists in Windows XP, I just wanted to test whether only IPV6 can be used on XP. It is possible in ...
8
votes
1answer
118 views

How do I specify an IPv6 address in the X Window DISPLAY variable?

I'm trying to export a DISPLAY variable containing a numeric IPv6 address. What format would the variable take, since IPv6 addresses contain :, which normally is used for the display number? Googling ...
8
votes
5answers
5k views

How can I use my server's IPv6 connection from my computer's IPv4?

I have a server that has IPv6 and IPv4 support. I would like to use this to allow my desktop, which has an IPv4-only connection, to connect to other servers via IPv6. What type of software is ...
7
votes
4answers
2k views

Does disabling IPv6 decrease my surface area of attack and increase performance?

I have colleague that is on this whole kick of disabling IPv6 while leaving IPv4 on each new machine that comes in before deploying in our environment. He takes his personal anecdotal evidence and ...
7
votes
1answer
6k views

IPv6 Tunnel via Own Linux (IPv6-connected) Server

Unfortunately, there's a lot of IPv6 tunnel brokers, and their documentation often clutters the search results for how to setup your own IPv6 tunnel. I have a Linux server with IPv6 connectivity. I ...
7
votes
5answers
11k views

How to get the IPV6 IP address of Linux machine?

I want to get IPV6 address on my linux box. I know one command to get the IPV6 address. Command: $ ip addr show dev eth0 | sed -e's/^.*inet6 \([^ ]*\)\/.*$/\1/;t;d' Output: 2001:410:0:39:221:28ff:...
7
votes
2answers
7k views

IPHLPSVC High CPU in Windows 8 x64

I was experiencing consistent high CPU usage in Windows 8 Pro x64. The cause was svchost running at a constant 25% CPU, even at idle. I checked the services that the svchost was running, and toggled ...