Questions tagged [ipv6]

Questions about IPv6, the newest version of the Internet Protocol. This tag should be used when asking about personal/home network IPv6 addressing, or basic IPv6 knowledge. Questions related to company-grade IPv6 networks are off-topic and should be asked on Network engineering SE.

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192
votes
3answers
273k views

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

If a server has only IPv6 addresses without a domain name, how can I connect to the server from my web-browser?
144
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3answers
108k 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 ....
143
votes
2answers
44k 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 ...
79
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7answers
149k 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 ...
70
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3answers
172k 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 ...
51
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3answers
46k 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 ...
50
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6answers
114k 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?
44
votes
1answer
127k 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 ...
43
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8answers
128k views

How to get the IPv6 IP address in Linux

I have a Linux server and I want to find the main IPv6 address via one single command line. My command so far: $ ip addr show dev eth0 | sed -e's/^.*inet6 \([^ ]*\)\/.*$/\1/;t;d' which shows: 2001:...
38
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2answers
77k 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) ...
37
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5answers
150k 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 ...
36
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3answers
63k 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
33
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12answers
401k 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 ...
31
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2answers
21k 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.
28
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5answers
133k 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 ...
28
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5answers
5k 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 ...
28
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6answers
71k 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 ...
26
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4answers
7k 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 ...
26
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2answers
111k 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 ...
24
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7answers
42k 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 ...
23
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1answer
80k 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 ...
22
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3answers
27k 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 ...
21
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4answers
48k 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 ...
21
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3answers
30k 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....
20
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3answers
45k 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 ...
19
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3answers
33k 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 ...
19
votes
3answers
20k 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?
18
votes
2answers
7k 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 ...
17
votes
5answers
72k views

How can I figure out what IPv6 to use if I want to set a static IP for my computer?

I recently installed Windows Server 2012 on my desktop. I changed my connection settings to hardcode my internal IP address as 192.168.0.99 (IPv4). Windows Server 2012 warned me that I should also set ...
15
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2answers
9k 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 --- :: ...
15
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3answers
2k views

Why does Google Chrome listen on port 8000?

Occasionally when starting up a development server (again), it will die with the message that the port 8000 is already in use. Running $ lsof -n -i4TCP:8000 | grep LISTEN then reveals Google ...
14
votes
2answers
15k 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 ...
14
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5answers
5k 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 ...
14
votes
1answer
8k views

How to transparently tunnel a port from IPv4 to a remote IPv6 device?

At home, I am connected with an IPv6 address and additionally, my provider provides a NAT-like setup through which I receive a public IPv4 address that I share with other customers (the reason being ...
14
votes
3answers
9k 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-...
14
votes
4answers
5k 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 ...
13
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3answers
1k 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.
11
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2answers
8k 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.
11
votes
1answer
25k views

Disable IPv6 on Interface in Debian Wheezy?

I'm working on Debian Wheezy: $ uname -a Linux openstack1 3.2.0-4-amd64 #1 SMP Debian 3.2.51-1 x86_64 GNU/Linux I set up two networks for VirtualBox: # Public network vboxnet0 (10.1.0.0/16) ...
10
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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 ...
10
votes
3answers
3k 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
14k views

what's IPv6 analogue for IPv4 `arp -an` and “arp who-has”?

In IPv4 world, when you want to talk to another computer, you ask which MAC address claims a given IPv4 address, the arp who-has ... tell ... exchange as per tcpdump, and a cache of such mappings from ...
10
votes
1answer
22k views

Using IPv6 with Virtualbox

I would like to test PNRP in an IPv6 environment under virtualbox. I have 2 XP VMs under virtualbox, and they only have IPv6 enabled. Firstly can I enable DHCP for IPv6 under virtualbox. If not then ...
10
votes
2answers
12k views

IPv6 home set-up | OpenWrt 18.06.1 - how to?

I am struggling with the IPv6 home set-up. I don't understand networking much to be honest. My ISP informed me last year he is IPv6 fully capable. I did not manage to set it up in my router since ...
10
votes
4answers
23k views

How do debug DNS name resolution? (nslookup works, but telnet doesn't)

I'm trying to connect to a website: http://superuser.com.sixxs.org i can ping the address: C:\Users\Ian>ping /6 superuser.com.sixxs.org Pinging ipv6.nginx.sixxs.net [2001:838:2:1::30:67] with ...
10
votes
2answers
7k 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 the ...
10
votes
1answer
2k views

Allow traffic through a firewall to a dynamic IPv6 address

Suppose I have this configuration on IPv4 right now: My router (a Linux box) is connected to the Internet on eth0 and my LAN on eth1. I want to forward port 80 to 10.1.2.3. Here's how I'd currently ...
9
votes
2answers
50k views

Disable IPv6 with OpenWRT

When I use stock Linksys firmware on my router, my networked devices properly use IPv4 only to access the Internet. When I use OpenWRT 15.05.1, the devices try to connect to various sites using IPv6 ...
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
4k 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 ...

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