IPv6 is the successor to IPv4. Rather than 2^32 addresses (like IPv4), it has 2^128, which is 340,282,366,920,938,463,463,374,607,431,768,211,456 unique addresses (34 undecillion). IPv6 addressing is quite different to IPv4 and is not backwards compatible, but protocols that sit on top (HTTP, SSH, ...

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15
votes
3answers
2k views

Can I bind a (large) block of addresses to an interface?

I know that the ip tool lets you bind multiple addresses to an interface (eg, http://www.linuxplanet.com/linuxplanet/tutorials/6553/1/). Right now, though, I'm trying to build something on top of ...
51
votes
17answers
22k views

Switching to IPv6 implies dropping NAT. Is that a good thing?

This is a Canonical Question about IPv6 and NAT Related: How does IPv6 subnetting work and how does it differ from IPv4 subnetting? How can I 'dip my toes' into dynamic IPv6 ...
52
votes
3answers
14k views

How does IPv6 subnetting work and how does it differ from IPv4 subnetting?

This is a Canonical Question about IPv6 Subnetting. Related: How does IPv4 Subnetting Work? I know a lot about IPv4 Subnetting, and as I prepare to (deploy|work on) an IPv6 ...
12
votes
2answers
6k views

Should I use IPv6 only or both IPv4 and IPv6 in my web server?

My web server (Ubuntu, Nginx) have both IPv4 and IPv6 addresses assigned by the host. For my website, shall I bind it to only an IPv6 address? Is it the standard recommended way? Or, shall I use both ...
13
votes
3answers
6k views

What is the IPv6 equivalent to IPv4 RFC1918 addresses?

Having a hard time wrapping my head around IPv6 here. A lot of the lingo seems targeted at enterprise-level IPv6 deployments, discussing link-local, site-local, global unicast, scopes, etc. Not a ...
2
votes
2answers
19k views

How to remove or disable IPv6 in Windows Server 2008 R2

We don't use IPv6 and we are not planning to use it. Apparently Windows Server 2008 R2 is installed with IPv6 on by default. We would like to uninstall it or totally disable it. I have unchecked the ...
9
votes
2answers
861 views

IPv6 without nat but what about an isp change?

I haven't worked with IPv6 outside of 4to6 tunneling on my home pc with stuff like GoGoNet. I've read about how it works in a general way. No NAT required (or suggested) and each client uses a public ...
8
votes
2answers
6k views

IPv6 DHCP Configuration

I want to set up an IPv6 only network for testing. However, I can't find any HOWTOs or information on setting up DHCP to autoconfigure IPv6 DNS server addresses etc. I use radvd on a ubuntu server to ...
5
votes
1answer
832 views

Win2k8R2 Obtaining DHCPv6 address, but has static configuration

I have a Windows 2008R2 server on a dual-stack network. IPv4 is working fine (statically assigned) but the IPv6 stack is misbehaving; I have configured it with a static IPv6 address (::bbbb:150 ...
3
votes
1answer
1k views

Linux IPv6 Transparent Proxy (but Linux doesn't support NAT on IPv6!?)

On Linux I can make a transparent proxy simply by adding a iptables -j REDIRECT command. To my surprise, I am needing to support IPv6. Simple enough right? iptables6 -j REDIRECT command not ...
2
votes
1answer
169 views

DHCP IPV6 Environment

May I know what are the changes needed in the DHCP message formats if I want to convert into ipv6 environment? Now I am using ipv4 dhcp client and ipv4 dhcp server. But I want to implement this using ...
2
votes
1answer
183 views

Support for IPv6 support?

This might sound very rudimentary to some but I am having trouble understanding the limitations of IPv6 My server has been assigned a block of IPv6 addresses by my hosting provider. According to my ...
1
vote
1answer
611 views

Adding a whole IPv6 /64 block to an network interface on debian

I tried adding a whole IPv6 (/64) block to an interface using ip route add local 2001:41d0:2:ad64::/64 dev lo like described here on my Debian server, but I seem to be missing something. If I ping ...
0
votes
1answer
235 views

v6tov4 in Linux?

I have a server which runs Debian system. I use pptpd for VPN services. But pptpd can only response to IPv4 traffic and ignore IPv6 traffic. Is it possible to establish VPN connection using IPv6?(That ...
35
votes
11answers
9k views

Why would you use IPv6 internally?

Of course, I realize the need to go to IPv6 out on the open Internet since we are running out of addresses, but I really don't understand why there is any need to use it on an internal network. I have ...
25
votes
8answers
43k views

“ipv6 equivalent” of 192.168.x.x (configuring a static ipv6 address)

Background: I have a windows 2008 machine and I want to make it a Domain Controller in a test domain made of two virtual machines. dcpromo pops up a warning if IP addresses for the machine are not ...
20
votes
1answer
6k views

nginx name-based virtual hosts on IPv6

I have an nginx server serving up nearly half a dozen different websites. It's running on a Linode that just got IPv6 native support (Dallas data center), and I'm trying to configure most of my sites ...
0
votes
3answers
3k views

how to completely disable ipv6 on Ubuntu 9.04

what i have done: /etc/modprobe.d/blacklist.conf blacklist net-pf-10 blacklist ipv6 /boot/grub/menu.lst title Ubuntu 9.04, kernel 2.6.28-15-server kernel ...
25
votes
4answers
4k views

Why can't IPv6 send broadcasts?

IPv4 can broadcast. Why can't IPv6 do that?
5
votes
3answers
12k views

Does Windows try to look for IPv6 AAAA records even when it does not have a routable IPv6 address?

My network router is a ZyXEL ZyWall USG 100, which has a built in DNS server. Many Windows computers connect to it and get IPv4 addresses via DHCP. They also are informed of the DNS suffix ...
4
votes
2answers
11k views

How can I setup OpenVPN with IPv4 and IPv6 using a tap device?

I've managed to setup OpenVPN for full IPv4 connectivity using tap0. Now I want to do the same for IPv6. Addresses and network setup (note that my real prefix is replaced by 2001:db8): ...
13
votes
2answers
256 views

How can I 'dip my toes' into dynamic IPv6 network addressing?

Is there any way in IPv6 to enable dynamic addressing and configuration for a subset of hosts on a network identified by specific mac addresses? I have been slowly working at setting up IPv6. All my ...
11
votes
5answers
579 views

How are IP-based rules (eg, bans/filters) affected once IPv6 becomes the standard?

Given that Stack Exchange sites ban on IP, I wonder if there's a common opinion or strategy about making rules based on a user's IP in order to dictate behaviors. With IPv4, you've got a few things ...
3
votes
2answers
437 views

When do browsers request and use IPv6 DNS records?

I'm glad my new Linode hosted server offers an IPv4 and an IPv6 address as well. And default DNS records, when using Linode as NS, shows both A and AAAA records example.com 86400 IN A 203.0.113.4 ...
2
votes
1answer
3k views

How to allow 6to4 through iptables firewall?

Im trying to allow 6to4 though my ipv4 firewall on Debian 6 (Squeeze) but without much luck, it seems most of the syntax used by other OS's isn't quite supported in Debian's iptables. I'v tried: (I ...
5
votes
2answers
402 views

Linux: Block IPv6 for certain applications / hostnames

Problem and aim We don't get IPv6 from our ISP thus I have an IPv6 tunnel which works fine but is, of course, not very fast. And not really reliable. I like to have IPv6 available "just in case" but ...
5
votes
1answer
945 views

KVM virtual machines cannot reach IPv6 web sites

I have a freshly installed Windows Server 2008 R2 SP1 virtual machine which is completely unable to reach any IPv6 web pages, despite apparently having proper IPv6 connectivity. In addition, other ...
5
votes
2answers
545 views

Does Active Directory on Server 2003 R2 support IPv6 subnets in Sites and Services?

I've been experimenting with IPv6 at our organization. The domain controllers (all 2003 R2) and most of the servers (2003 R2 / 2008 / 2008 R2) have IPv6 configured. We have a subnet assigned through ...
5
votes
3answers
3k views

Listening for both IPv6 and IPv4 in apache 2.2

I'm using apache2.2 How to listen both Ipv6 and Ipv4? or only Ipv6 / only Ipv4
4
votes
2answers
548 views

Find IPv6 Router advertising a prefix

I am using a Centos 5.5 box. Something on the network is advertising IPv6 prefixes, and I want to know who. One solution would be to install tcpdump or tshark and just look at the network traffic. I ...
3
votes
4answers
3k views

Debian Squeeze ip6tables setup

I am setting up a firewall for ipv6 on Debian Squeeze. It is a webserver, so I think the only port that need to be open to the world for ipv6 is 80. This is what I have: *filter :INPUT DROP [0:0] ...
3
votes
2answers
1k views

NATing IPv4 while routing IPv6

I've the following setup: client(s) <---> (eth0) router (eth1) <---> wan I have a static IPv4 address and a /48 IPv6 address block. I need to connect all the clients to (wan). Each ...
3
votes
1answer
1k views

IPv6 routing over VPN

I'm running OpenVPN on Debian Lenny and Tunnelblick on OSX. my goal is to have a fully routed VPN that supports IPv6. the OpenVPN server has a functional 6to4 device, so now my goal is to get the ...
2
votes
1answer
1k views

Squid proxy: how to link inbound IPv4+port to outbound IPv6

I'm trying to setup a squid proxy that will accept multiple inbound connections on one IPv4 across a range of ports, and for each port connection to connect out on a unique IPv6 address. I've named ...
2
votes
2answers
2k views

Debian Wheezy IPv6 isn't configured with ifup post-up hook

We recently set up a server on Debian Wheezy Beta 3 (x86_64) which has a native IPv6 connection. We configured the eth0 interface to get the IPv6 configuration through some post-up hook commands in ...
2
votes
1answer
2k views

Is there a way to disable IPv6 SLAAC on a per-interface basis in Debian?

I have a scenario where appliances running Debian may have multiple network interfaces. I want my eth0 interface to get its address via SLAAC configuration, but I want the remaining interfaces to ...
2
votes
1answer
490 views

IPv6 in a Windows XP/Windows 2003 Network

Has anyone successfully deployed an IPv6 network in an environment with Windows XP SP3 workstations and Windows 2003 R2 servers? Are there any operating system issues one needs to consider? Does the ...
1
vote
0answers
68 views

IPv6 Client Service

I got a Windows Server 2012 which provides DHCPv4 and DHCPv6. The NIC on the Server got 2 IPv6 addresses. I found out that the second IPv6 comes from the "IPv6 Client Service" which (only the ...
0
votes
0answers
194 views

No IPv6 traffic in bridge mode

Hello happy people o/~ yesterday I had the audacity to reboot a remote Linux server. This Ubuntu 64, 12.04 installation went from kernel 3.11.0-19-generic to 3.13.0-32-generic and also from being ...
0
votes
1answer
330 views

Can these IPv4 and IPv6 firewall rules be hardened any further? [closed]

I am running Ubuntu 10.04. Here are the IPv4 firewall rules that I've been using now for a few months: *filter #Allow all loopback (lo0) traffic and drop all traffic to 127/8 #that doesn't use lo0 ...
0
votes
1answer
449 views

IPv6 DNS Lookup

I am trying to prevent a webserver to do IPv6 lookups (AAAA) to the DNS-server. The webserver has no IPv6 addresses set-up on the interfaces. Disabling IPv6 in sysctl.conf had no impact either, the ...
-1
votes
3answers
2k views

SNAT in IP6Tables

Netfilter says they have support for SNAT and DNAT for ipv6. I look under the man pages of ip6tables and see that there is SNAT and DNAT listed. So my question is how do you make rules for them? I ...
6
votes
3answers
302 views

Is there already a recommended IPv6 Firewall setup?

I'd like to switch from private-IPv4-subnet-behind-NAT to IPv6, but of course I have no intention of exposing my users' workstations "unprotected" to the net. Some obvious points up-front: Allow ...
6
votes
2answers
210 views

DNSBLs for IPv6

Spamhaus and other well-known DNSBLs don't yet support IPv6, and I'm not sure they ever will. What alternatives are there for spam filtering on IPv6? One approach is to rely entirely on ...
2
votes
2answers
1k views

Does Varnish support IPv6?

Their specification draft says they should on section 3.2.1. Are we there yet? Has anyone used Varnish with IPv6?
2
votes
2answers
895 views

Linux IPv6 loopback routes getting automatically added

We have a router running Debian Lenny that has been happily routing IPv6 for several months. Our upstream has advised that our address range is changing, and both are currently operational, so I ...
1
vote
2answers
469 views

Globally setting ipv6only=off

Since an update my nginx server is only available via IPv6 and not IPv4 while my config contained listen [::]:80 default_server; Now I've changed this to listen [::]:80 default_server ...
1
vote
1answer
141 views

why dstat failed with --tcp option?

why --tcp option failed? should i install some package? if yes, which package i should install? this question is not the same as ...
0
votes
1answer
368 views

'IPv6' Newbie with IPv6 address assigment

I am new to IP v6 and I am looking to translate some existing private IPv4 addresses into v6 address assignment. Can someone please help me to answer/explain the questions below? If I have an v4 ...
0
votes
2answers
1k views

Hosting websites on a public ip routed via a private subnet using one Linux machine as both router and server

I use Ubuntu server as router, NATing router and webserver. The server is connected to ISP with a public /29 subnet. Also I host some important websites on it. I asked the ISP to provide ipv6 address ...