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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5
votes
2answers
433 views

IPv6 and NAT, routing to multiple ISPs

Currently I have a nice setup using private IPv4 address space and uplinks from two ISPs to the Internet. Thanks to NAT I can just take down one of the interfaces and the Internet access is still ...
15
votes
2answers
1k views

Why is ARIN (etc.) allocating such large blocks of IPv6 addresses?

The whole issue of IPv4 depletion and waste seems to be finally getting behind us with the (somewhat) increased deployment of IPv6. The sole purpose of IPv6 was to solve the issue of IPv4 address ...
0
votes
0answers
16 views

Bind, IPV6, and Out of Zone Data

I am running into some problems getting bind properly configured to support IPV6 hosts. IPv4 is working fine, no issues. My zone file has both IP4 and IP6 data intermingled which I believe should ...
1
vote
2answers
51 views

Configure IPv6 - CentOS OVH - Can't ping

I can't ping my IPv6 from outside and inside of the server, i can't ping any IPv6. My IPv6 : 2001:41d0:2:XXXX::/64 I use CentOS 6.6 with a Xen Kernel that supports IPv6. My provider is OVH and i ...
3
votes
1answer
99 views

IPv6: ip-based or name-based vhost?

With IPv4 the recommended type of vhosts is name-based since you need only one IPv4 address. IP-based vhosts should only be used if name-based doesn't work (because of TLS for example) With IPv6 ...
19
votes
4answers
3k views

How to disable AAAA lookups?

... to compensate for broken DNS servers that are outside our control. Our problem: We deploy embedded devices that collect sensor data at various, mostly IPv4-only sites. Some sites have poorly ...
0
votes
1answer
38 views

IPv6 Vs IPv4 for geolocation

disclaimer at first : this question is from a noob on IPv6 topic. Our web server initially had IPv6 active and Nginx not configure properly so the users with IPv6 got an error and website did not ...
-1
votes
0answers
30 views

How can i ssh with my ipv6 via putty [closed]

i configured my sshd_config as : AddressFamily any ListenAddress 0.0.0.0 ListenAddress :: ListenAddress [2001:bc8:2095:101::5]:512 i cant connect via putty. I tried the address without a ...
0
votes
1answer
22 views

Can't ssh after configuring sshd_config

I have configured my sshd configuration files to listen to ipv6 addresses, but forgot to uncomment ipv4 local addresses. Here is a snippet from my configuration file: AddressFamily any ListenAddress ...
0
votes
0answers
4 views

Access IPv6 computer from IPv4-only network. Is it possible? [migrated]

I recently changed from an ADSL 10 MB to a GPON 40 MB and since then I'm having a bad headache. My old ISP (ADSL) gave me always a valid public IPv4. Sometimes it changed but there was no problem ...
3
votes
4answers
2k views

How to bind a non-local IPv6 address?

Is there an equivalent of net.ipv4.ip_nonlocal_bind for ipv6 ? Need to start my nginx on boot on such an IP... My Ubuntu doesn't have this IPv6 assigned on eth0 quickly enough despite this ...
0
votes
1answer
62 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 ...
10
votes
2answers
1k views

Prefer IPv4 incoming connections over IPv6

We run a social/local service that benefits from geolocating the IP of users. The problem is that with IPv6, geolocation is quite a bit spottier than with IPv4. Is there a way to prefer incoming ...
18
votes
2answers
10k 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 ...
0
votes
2answers
55 views

Delay associated with AAAA request

I have a standalone, isolated network running mixed Windows and Linux systems, with a Windows 2008 R2 server performing AD duties and DNS. I'm seeing 5-second delays with the use of getaddrinfo on ...
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 ...
11
votes
4answers
8k views

How to prevent delays associated with IPv6 AAAA records?

Our Windows servers are registering IPv6 AAAA records with our Windows DNS servers. However, we don't have IPv6 routing enabled on our network, so this frequently causes stall behaviours. Microsoft ...
2
votes
1answer
4k views

Difference between link-local and global link addresses in ISATAP

What is the difference between link-local address and global link address in ISATAP? For example: link-local address: fe80::5efe:c000:0201 global address: 3ffe:b00:1:2::5efe:c000:0201 Why don't ...
1
vote
0answers
39 views

Ubuntu 14.04 ignoring SLAAC IPv6 configuration

I am having issues getting an Ubuntu 14.04 server to pickup an IPv6 address through SLAAC. I have gone through the process of changing all the configuration settings I could find through google, but ...
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
15 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
1answer
231 views

Ubuntu IPv6 port redirect using ufw

I'm trying to configure port redirection from port 80 to 8080 on server with both IPv4 and IPv6 support. The OS is Ubuntu 14.04 with the 3.2* series kernel. It is a production server, so I don't want ...
2
votes
1answer
22 views

Apache VirtualHost wildcards with IPv6

Using Apache 2.4 on Ubuntu, I have the following in ports.conf: Listen XX.73.44.57:80 Listen [2001:XX:0:2c38::39]:80 <IfModule ssl_module> Listen XX.73.44.57:443 Listen ...
-1
votes
0answers
32 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
86 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
184 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
63 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
46 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
3k 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
59 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 ...
0
votes
1answer
16 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
35 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
26 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
24 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
121 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. ...
0
votes
0answers
19 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
58 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
34 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
39 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
98 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
953 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 ...
0
votes
1answer
62 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 ...
0
votes
1answer
50 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
89 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
215 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
508 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 ...