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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1answer
15 views

How do I forward IPv6 to IPv4?

I am testing a LAN network that will be based on IPv6, but without IPv4 support, i cannot connect to other networks. Can I confirure a router to forward IPv6 requests from local network (LAN) to IPv4 ...
0
votes
1answer
22 views

traceroute6 connect: Network is unreachable

I'm experiencing this problem on both Ubuntu 14.04 and Fedora 21, running in Amazon EC2. I have full LAN and Internet connectivity, and I can successfully run traceroute gmail.com But running ...
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votes
0answers
25 views

Choose IP on server with ubuntu installed [on hold]

I have a server which has ubuntu installed on it. The server has one IPv4 address and 99 IPv6 addresses. By default the IPv4 address is used. Link encap:Ethernet HWaddr 00:1c:42:e3:cb:33 inet ...
2
votes
1answer
26 views

Making changes to default IPv6 route persistent in CentOS 7

I have several IPv6 addresses on a CentOS 7 server and need to make a specific v6 address the default address used in routing. I have been able to do this by modifying the route table. ip -6 route ...
1
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0answers
25 views

Connecting two different IPv6 /64 prefixes together [on hold]

I have a Windows Server 2012 R2 RRAS VPN that is both IPv4 and IPv6 capable. I was having problems with external IPv6 connectivity but managed to resolve this here: RRAS SSTP VPN IPv6 traffic is not ...
3
votes
2answers
83 views

End-to-Site VPN from IPv4 -Host to IPV6 (only) - Site

I want my IPv4 only Clients to my IPv6 only Site. I have a dualstack Server which I could use as a gateway. There is a Question somewhat related here: IPv6-only client to IPv6/IPv4 dual stack server ...
11
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2answers
479 views

IPv6 subnetting a /64 - what will break, and how to work around it?

In IPv6, you are not supposed to subnet to anything smaller than a /64 (RFC 5375). Among other things, SLAAC does not work with smaller subnets, and apparently also some other features will break. ...
0
votes
1answer
58 views

How is device to send a response packet selected

I read that when kernel determines a source ipv6 address for the packet, it takes into consideration what interface will be used to send the packet, (http://www.rfc-editor.org/rfc/rfc3484.txt, ...
0
votes
1answer
41 views

Setting up mikrotik router with native IPv6 with only a single /64 block

I am at a colo provider that supplies a single IPv6 /64 block. The goal was to route the provided /64 of IPv6 addresses to the hosts behind the Mikrotik running RouterOS 6.24. Some Mikrotik ...
1
vote
1answer
59 views

RRAS SSTP VPN IPv6 traffic is not able to be routed through server

I have a Windows Server 2012 R2 Essentials box which is configured with the basic RRAS VPN functionality, it isn't configured as a router, this functionality is not enabled and my R2 Essentials box ...
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votes
0answers
5 views

How to setup an OpenVpn tunnel to IPV4 from a dualstack lite (ipv6 address only) cable modem [migrated]

As of today, I am on a nice and fast new cable modem connection. Unfortunately, that connection is natted to an external shared IPV4 by my ISP. It is only possible to reach my modem via a unique IPV6 ...
0
votes
1answer
44 views

DNS resolving incorrectly for some countries

European visitors are being served an old version of the website - because it appears they are getting a site that is resolving to an ipv6 address. Other countries resolve to the correct ipv4 IP. ...
1
vote
1answer
98 views

Rule to allow port 80 using IPV6

My server: 64 bit Ubuntu 12.04.4 LTS. Provider: Linode.com. No other firewall is present. I've these rules: *filter # Allow localhost traffic. This rule is for all protocols. -A INPUT -s ::1 -d ...
3
votes
2answers
158 views

ESXi refuses AD join, “The host does not have a suitable FQDN”

I have an ESXi 6 hypervisor (esx.ad.example.com) that I want to join into an AD domain (ad.example.com) with one DC. Both domain controller (dc.ad.example.com) and hypervisor have an IPv6 address and ...
1
vote
0answers
36 views

Openbsd 5.7: IPv6 advertisement not working

--context-- I have a Sokeris with 8 interfaces: em0 is connected to a bridge router (ISP) and em2 is connected to my DMZ network (web servers). I got from my ISP a /56 prefix and 2 DNS IPs but no ...
0
votes
0answers
19 views

can't permanently delete automatic MAC-based inet6 address

Although I never explicitly configured ipv6 on my rhel servers and only have static ipv4 configuration in /etc/sysconfig/network-scripts/ifcfg-eth0, an automatic ipv6 address based on MAC address ...
0
votes
3answers
188 views

how do I stop protocol 41 unreachable packets from being sent?

I'm using a Hurricane Electric tunnel on one of my VPSs, and it isn't working completely. I set up the tunnel with a script basically identical to this one: ...
0
votes
1answer
21 views

ip6tables forward chain filters all ports

Trying the following on a centos 6 node (running openvz kernel) ip6tables -F ip6tables -X ip6tables -P FORWARD DROP ip6tables -A FORWARD -p tcp -m multiport --dports 21,22,80,443 -j ACCEPT ip6tables ...
0
votes
0answers
34 views

Setting up stateful DHCPv6 on Linux

I want to set up a DHCP server on my local network for IPv6 that issues addresses and further information like DNS/NTP and so on. From my ISP I got the IPv6 Prefix which I will refer to as in further ...
0
votes
1answer
21 views

ip6tables port dropping and defaults

On CentOS 6, ip6tables is literally giving a nightmare on this machine. Having ip6tables -P INPUT ACCEPT ip6tables -P OUTPUT ACCEPT ip6tables -P FORWARD ACCEPT with ip6tables -A INPUT -p tcp -m ...
2
votes
0answers
43 views

Is global IP one-to-many communication practical today? [closed]

One-to-many communication over the internet is an enabling technology for many fascinating business and research projects. In principle, IPv4 and IPv6 allow for such communication by the ...
0
votes
0answers
23 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
93 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
101 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 ...
0
votes
1answer
42 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 ...
0
votes
1answer
27 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 ...
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 ...
0
votes
2answers
63 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 ...
1
vote
0answers
78 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 ...
2
votes
1answer
29 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
vote
0answers
100 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
210 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 ...
0
votes
1answer
47 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) ...
0
votes
0answers
82 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
72 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
27 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 ...
2
votes
1answer
74 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
0answers
56 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
52 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. ...
-1
votes
1answer
29 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
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
0answers
23 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
75 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 ...
0
votes
0answers
63 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
1answer
38 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 ...
1
vote
2answers
187 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?
0
votes
1answer
77 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
53 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
115 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 ...