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
34 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 ...
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1answer
2k views

IPv6 link-local routing

Link-local address: Routers do not forward packets with link-local addresses. What I want to know is: that makes sense if the destination is a link-local address, but what if I have a box that ...
0
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1answer
24 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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0answers
26 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 ...
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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 ...
2
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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 ...
5
votes
4answers
2k views

IPv6 LAN to IPv4 with PFsense

Is it possible to setup PFsense to do IPv6 to IPv4? I am setting up an IPv6 LAN for "testing" and also to mess around with and I can't get an IPv6 address from my ISP so I need a way to change IPv6 ...
1
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2answers
147 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 ...
3
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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 ...
7
votes
1answer
530 views

ip6tables rules are completely ignored inside OpenVZ container

We have set up IPv6 networking on openvz using bridged veth devices. The IPv6 traffic to and from the VEs works fine. ip6tables works on the HN and iptables work on the VE. Inside the VE we can set ...
1
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1answer
61 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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2answers
215 views

DirectAccess: Client receiving icmp error from Ipv6 address

Pardon my naivety but I have never setup DirectAccess before, I've done some research prior and was unable to find a relevant resource. Let me provide a little background and then I'll jump into the ...
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, ...
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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
3answers
812 views

ipv6 Loopback Addresses (equivalent to 127.x.x.x)

I have a development environment set up where I have a separate loopback address for multiple websites. For example, I have the following: 127.0.0.1 www.mysite.dev 127.0.0.2 foo.mysite.dev 127.0.0.3 ...
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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 ...
4
votes
4answers
3k views

Debian ip6tables rules setup for IPv6

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] ...
0
votes
1answer
42 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 ...
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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
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
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. ...
22
votes
2answers
11k 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 ...
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. ...
3
votes
2answers
159 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
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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
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
44 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 ...
5
votes
2answers
489 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
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
94 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 ...
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
43 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
28 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 ...
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
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 ...
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 ...
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
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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 ...
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
238 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
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 ...
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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 ...