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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0answers
17 views

Tunnel ipv4 over ipv6 only network

I have a rather weird scenario and I'm wondering what is the best solution. It is as follows: I have a gateway which is only reachable via ipv6 from the internet, internally there is ipv4 and ipv6. ...
1
vote
0answers
13 views

Ipv6 over bridged network stops working after some time (Ubuntu LXC)

i hope you can help me. I am running several Linux Containers on a bare metal server which is provided with an Global Ipv6 address as well as an 64-bit network by my provider. I have configured IPv6 ...
3
votes
2answers
145 views

Why does ip6tables -A INPUT -j DROP blocks outgoing server connections

I'm willing to configure both iptables & ip6tables for IPv6. But for some unknown reason last ip6tables rule in my config block any outgoing connection for my server (apt-get, wget, ping, ping6 ...
2
votes
1answer
47 views

IPv6 web server unreachable

I've bought a new dedicated server with 2 IPv4 addresses and a /56 IPv6 subnet. When I ping to my domain names on the dedicated server I get a message back. But when I ping from outside nothing ...
0
votes
1answer
43 views

IPv6 users see different site than IPv4 users [closed]

I had a site hosted on 1and1 that I moved to an Azure VM. I found that some people who have IPv6 enabled in their routers (not sure if that's the only situation but it's the one that I came across) ...
12
votes
3answers
2k views

Is there a Linux kernel boot parameter to configure an IPv6 address?

I know there is a parameter named ip which lets you configure IPv4 addresses on the Linux kernel through the boot loader. That looks like the following: ...
0
votes
0answers
29 views

OpenVPN can't ping host outside local network

After an entire day spent to let openvpn's client get their ipv6 and ipv4 at the same time now i have a big problem. ipv4 works fine From my openvpn server i can ping6 every host From my openvpn ...
-2
votes
1answer
24 views

IPv6 and dynamic hosts… A few questions? [closed]

I'd like to configure IIS (Internet Information Server) to host a local web site that's only accessible via IPv6.. And since I am new to IPv6, i figure this is the best forum for this! Here's the ...
0
votes
0answers
38 views

nginx won't listen ipv6

I'm running a nginx server (1.8.0) and I want to listen both in ipv4 and ipv6. But even with the right listen statement (and a restart of nginx of course) a netstat -tlp | grep nginx return tcp ...
0
votes
1answer
8 views

ipv6 address configuration on serial interfaces

I tried to configure Ipv6 static routing on three routers, I configured ipv6 addresses on all three routers using ipv6 address auto config, The middle router have been configured with different global ...
0
votes
0answers
20 views

NGINX doesn't start on CentOS 7 reboot (fail on try to bind ipv6 address)

I have installed nginx / 1.8.0 on my server (CentOS 7.1), but does not start automatically after restart due to this error: 2015/06/20 10:34:11 [emerg] 827#0: bind() to [ipv6-address-here]:80 failed ...
0
votes
1answer
15 views

OpenVPN ifconfig-ipv6 in TAP mode

I want to set up IPv6 address on my OpenVPN server operating in TAP mode. According to documentation, ifconfig expects two parameters: l and rn. For TAP devices, l is local address, rn is netmask. ...
2
votes
4answers
2k views

How to remove autoconfigured IPv6 Addresses in Windows 7/2008?

I'm in the process of exploring IPv6 deployment in my network. I've changed the advertised subnet and now my windows PCs have IPs from the new and the old network. I was able to reset the adapter by ...
36
votes
12answers
11k 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 ...
-1
votes
1answer
17 views

ufw status (what does the v6 stand for?)

My ufw status output looks like this: To Action From -- ------ ---- 22 ALLOW Anywhere 80/tcp ...
2
votes
1answer
118 views

Are there any use cases for supporting zone ids for public ipv6 addresses?

I am testing a product made by a vendor for communicating with external servers with public IP addresses. When testing the product I noticed that IPV6 addresses with zone ids, e.g. ...
-2
votes
0answers
39 views

Reverse Zone, PTR record in GoDaddy

I've just setup my domain in GoDaddy and want to add a DNS Reverse zone, PTR record in order to get my reverse IPv6 working, e.g the test in IPV6-test.com. I have got this working with another domain, ...
0
votes
0answers
11 views

IPv6 dead before receiving ICMPv6 ping

TCPv6 and UPDv6 are dead until server received ICMPv6 ping. Further analysis shows that actually TCP and UDP packets won't even come to the server. But after receiving ICMPv6 ping, everything starts ...
0
votes
0answers
17 views

mac osx ping6 only with sudo?

today I encountered a weird problem on Mac OSX 10.8.5 and IPv6: I tried to ping6 a host that is known to be up and running (I am connected to the host in question through ssh using the same remote ...
1
vote
1answer
44 views

Force use of IPv6 address over IPv4 address

I'm attempting to serve a website from a machine that only has an IPv6 address. I have purchased a domain name and changed the AAAA record of the DNS resource record to my IPv6 address, and have ...
1
vote
1answer
32 views

Cant set IPv6 Address on centos6

Im having this issue recently. the iproute2 utility cant add a ipv6 address /sbin/ip -6 addr add 2001:0db8:0:f101::1/64 dev eth0 RTNETLINK answers: Invalid argument that ip is just copied from ...
0
votes
0answers
24 views

Make LXC containers directly accessable with ipv6

First off I have a special IPv6 address allocated to my dedicated server, just 1. A ::1/128 one. But I can assign addresses to eth0 (eg ::2/128, ::3/128, etc). Now I would like to run LXC containers ...
1
vote
2answers
48 views

What is the ipv6 equivalent of 0.0.0.0/0

When describing IPv4 networks, I can use 0.0.0.0/0 or just 0/0 to specify all networks. What is the equivalent notation for IPv6?
5
votes
1answer
3k views

Static IPv6 address advertising and IPv6 autoconfig in Debian/Ubuntu

I have a network that advertises IPv6 addresses through IPv6 autoconfig. To allow DNS lookups and to have fancy IP addresses, we setup "static" IPv6 addresses through /etc/network/interfaces: auto ...
12
votes
3answers
908 views

Why does /proc/net/tcp6 represents ::1 as ::100:0

I was writing an utility to check /proc/net/tcp and tcp6 for active connections as its faster than parsing netstat output. As I dont actually have ipv6 enabled I was mainly utilizing localhost as my ...
2
votes
1answer
1k views

Windows 7 Client gets incorrect IPv6 Prefix Length

I am currently setting up IPv6 and DHCPv6 for Server 2008 R2 on my private network for testing. I was able to get DHCPv6 to work by configuring a static, then setting up the scope. I was also able to ...
0
votes
1answer
53 views

How to assign multiple IPv6 Alias addresses to one network interface

I have an IPv6 Range which i am trying to assign on a centos6 server. I have updated my below files for IPv6 configuration: [root@test ~]# cat /etc/sysconfig/network NETWORKING=yes ...
1
vote
1answer
1k views

/etc/init.d/iptables-persistent start returns fail but seems to work

I am trying to activate iptables-persistent on an Ubunutu server. Config files are located in /etc/iptables/rules.v4 /etc/iptables/rules.v6 I have installed the iptables-persistent package. ...
0
votes
1answer
47 views

IPv6: I'm confused about addresses [closed]

I'm starting studying IPv6 and I'm having some troubles understanding some aspects. Let's clarify if I'm getting this right! A single host may have: - a unicast global address - a link local address ...
1
vote
2answers
77 views

How do I send network packets from an ipv4 address (with port forwarding) to an ipv6 address (no port forwarding) without STUN?

* I have the following situation: * Bob wants to interact with Alice directly (encrypted interaction, no intermediary server who will forward his packets). Both are behind NAT. Alice has a public ...
0
votes
2answers
199 views

Dual-Stack Lite and FTP connection via IPv4 - How?

my original question: FTP client/server failing on switching to PASV mode Based on that, I would like to know if/how I can open a FTP connection from a computer that is inside a ISP's network that ...
2
votes
2answers
473 views

Possible to re-enable IPv6 without rebooting?

I have a machine running CentOS 5.8. IPv6 was disabled by creating a file /etc/modprobe.d/disable-ipv6 with the following contents: options ipv6 disable=1 Removing the file and rebooting the ...
1
vote
0answers
15 views

Custom IPv6 stateless autoconfiguration suffix [duplicate]

When a router announces an IPv6 prefix via Router Advertisements, a host can use SLAAC to automatically derive the remaining bits from its MAC and use the combination as its globally routable IPv6 ...
1
vote
0answers
26 views

More Than One Static Address Binding for DHCP?

I have my DHCP server setup to be connected to three subnets (ie: 2001:abab:1234:1:: or 2001:abab:1234:2::) using three unique IP addresses, except in DHCP server binding properties I can only see one ...
2
votes
1answer
176 views

IPv6: No NAT / Local Addressing + ISP Offline

I've been reading some articles about IPv6 and I'm currently playing with some addresses on a VPS. Recently I was thinking on a typical home/office IPv4 network. We're used to have a local DHCP ...
3
votes
1answer
458 views

IPv6 Not Routing Properly

I am setting up a RRAS machine for my personal use and for use by a few of my friends. I am currently using Windows Server 2012; but I have tried this with Windows Server 2008 R2. Both systems ...
0
votes
1answer
52 views

Bind9: Master->Slave Notify IPv6 with fallback to IPv4

I've a small Master->Slave DNS scheme setup between two machines running Debian 8 + Bind9 in dual IP stack. The master and the slave both own an IPv4 and IPv6 used by bind, enfored by the ...
1
vote
1answer
230 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 ...
1
vote
0answers
42 views

Windows Server 2012R2 DHCP Scope Preference

I have three scopes setup in DHCP. Subnets 0, 1, and 2; setup with the preference of 1, 2, and 3 respectively. Yet when I tell a client to renew its address it gets an address from subnet 1. What is ...
0
votes
2answers
69 views

Apache 2.2 won't start with an ipv6 address [closed]

I'm trying to only allow the localhost on a certain folder, it works perfect with ipv4 (Allow from 127.0.0.1) but as soon as I add ipv6 (Allow from [::1]) my Apache won't start anymore. I checked the ...
16
votes
3answers
3k 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 ...
3
votes
1answer
125 views

Disable DHCPv6 client in Windows

I don't quite understand the link between 4 parameters related to IPv6 stateful and stateless autoconfiguration used under netsh int ipv6 set interface command context in Windows: advertise ...
2
votes
2answers
112 views

Why is 2002:: an invalid IPv6 addresss?

I'm currently learning IPv6 and during a test I tried to configure an interface with the global IPv6 address 2002:: and failed, stating that is an incorrect address. And I have noticed that if I try ...
0
votes
0answers
60 views

IPv6 with IPv4 over RRAS SSTP VPN from Client that only has IPv4 access

I'm setting up Server 2012 R2 RRAS to be a SSTP VPN. I've got IPv4 working perfectly. My environment is dual stack (v4 and v6). When I enable IPv6 on the VPN my client gets a valid address but is ...
1
vote
2answers
92 views

DNS: Root hint server 2001:500:1::803f:235 must respond to NS queries for the root zone

We are using IPv4 in our company. Our ISP does not provide IPv6 and this won't change in the next years. The Best Practices Analyzer (BPA) of our Server 2012 R2 DNS server warns about the IPv6 DNS ...
1
vote
0answers
61 views

Linux ipv6 forwarding

Situation I know how to do ipv4 forwarding, and expected ipv6 forwarding to work pretty much the same way. So I configured a VirtualBox host with the network address configured from my ISP. Right ...
0
votes
0answers
61 views

Setting up OpenVPN with IPv6 drops packets

I have tried a multitude of OpenVPN tutorials with zero luck getting OpenVPN up and getting clients to talk to the internet with IPv6. However IPv4 works just fine. The server is Ubuntu 14.10 and ...
2
votes
1answer
288 views

Why does an IPv6 route added before virtual machine is started not work

I have an external server at Hetzner with Debian 7 and trying to setup KVM with IPv6 Routing (the same setup works for IPv4 without problems). I have one Ubuntu Server VM with two interfaces which ...
1
vote
0answers
45 views

DNS not working with Ipv6

I'm trying to configure bind for ipv6 protocol.I have added the entries to the zone and configuration files but still the ipv6 IPs are not returned when i try for nslookup.Can someone guide me to ...
0
votes
0answers
53 views

How to configure DHCPv6 and DNSv6 configuration in Ubuntu 12.04?

I'm planning to configure DHCPv6 and DNS server in my network. I would like to understand whether both DHCPv4 and DHCPv6 can be configured using isc-dhcp-server service? When i tried nslookup ...