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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2 views

Disable IPv6 with OpenWRT [migrated]

When I use stock Linksys firmware on my router, my networked devices properly use IPv4 only to access the Internet. When I use OpenWRT 15.05.1, the devices try to connect to various sites using IPv6 ...
0
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0answers
42 views

Why is the AAAA record called like this? [on hold]

I was wondering why the AAAA record in DNS is called like this. Why quad-A and not something else? I understand that there was a proposal to rename the record to A6, which was eventually turned into ...
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0answers
31 views

Delayed Ping of a link-local address with Windows 7/Server 2008 R2/Server 2012 R2

I have a strange effect here, which I do not understand. PS C:\Users\user1> ping fe80::219:bbff:fe0e:c600%16 -t Ping wird ausgeführt für fe80::219:bbff:fe0e:c600%16 mit 32 Bytes Daten: Zielhost ...
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0answers
20 views

Listening to all IPv6 Addresses? [duplicate]

I have a Server that has a /64 IPv6 block assigned to it (fully routed to the Server according to the network technician). Is there a possibility to have the Server listen on the entire IPv6 block? (I ...
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0answers
9 views

WRT54GL with OpenWRT not processing Neighbor Advertisement messages

I'm configuring a simple IPv6 testbed for some experiments, and running into a weird issue: my router (a WRT54GL running OpenWRT Backfire) is not processing individual Neighbor Advertisements over the ...
0
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0answers
34 views

libvirt IPv6 Guest can't connect outside of the Host

i am trying to get a address from my IPv6-Subnet working in a Virtual Machine(libvirt, qemu). IPv4 over nat works like a charm. The host is a Debian 8.5 with qemu 1.2.9 and a 4.6.3-1~bpo8+1 (2016-07-...
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votes
1answer
45 views

how to ping ipv6 neighbor with global scope address [closed]

I have 3 virtual machines. (VyOS router, 2 x Ubuntu 14.04). VyOS advertised some prefix 2001:DB8:0:1234::/64. Now my ubuntu hosts have two ipv6 addresses: ubuntu 1: link-local scope: fe80::1111:...
0
votes
1answer
29 views

Why is my host not receiving packets sent across tun0?

I have a tun0 interface set up which allows packets to be sent as such: HOST (aaaa::1) ----> tun0 ----> SLIP ----> Router (aaaa::200:0:0:1) The router receives the packets, and can send back a ...
5
votes
3answers
686 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 ...
3
votes
0answers
60 views

How can I identify a rogue IPv6 DHCP server on my LAN?

This will be kind of a long post, but I want to give complete information. I have a home/business LAN with isc-dhcp-server running an ipv4 dhcp server and bind as a DNS server running on an ubuntu ...
17
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5answers
2k views

Are people really going to use public IPv6 addresses on their private networks? [duplicate]

I have been reading the Debian System Administrator's Handbook, and I came across this passage in the gateway section: ...Note that NAT is only relevant for IPv4 and its limited address space; ...
4
votes
5answers
2k views

Can a global IPv6 address be NAT'd to an internal IPv4 address at a firewall-level?

As an organisation we've just requested our first IPv6 allocation. At present we are a wholly IPv4 organisation with a global IPv4 address allocation configured on our edge router and used (...
0
votes
2answers
732 views

IPv6 configuration for my private network when prefix delegation is not supported by the provider?

I have a typical router with IPv4 and NAT setup. My provider sends an IPv6 address to the router, but it does not support the IPv6 prefix delegation. How can I get IPv6 addresses for my private ...
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0answers
32 views

Debian 7 losing IPv6 default route randomly

I have a Debian 7 server setup and it keeps losing IPv6 connectivity after some time. I found that the default route is removed and is what appears to cause the Issue. Any help to fix the issue would ...
1
vote
1answer
33 views

ipv6 proxy forward result in bad request

I've configured the apache httpd server to act as a proxy forwarder. Following is my conf file details Listen 0.0.0.0:9999 Listen [::]:9999 <VirtualHost *:9999> SSLEngine off SSLProxyEngine On ...
5
votes
1answer
1k views

Mikrotik: how to properly setup IPV6 routing/dhcp server

I have the following configuration in my network: ISP Router <- eth1 -> Mikrotik Router <- eth2-5 -> Internal network My ISP router receives a /64 IPV6 block that is dynamic, changing ...
0
votes
1answer
58 views

How to use native ipv6 together with 6to4? I got lost packets

I've found that I can't run native IPV6 interface (at eth0) with 6to4 tunnel (at tun6to4) together. Here's my setup (/etc/network/interfaces/): auto eth0 auto bond0 iface eth0 inet static ...
2
votes
1answer
148 views

CentOS 7 connectivity issues

I have a second CentOS 7 box that's having a lot of trouble connecting. Basically, we were running WHMCS, but a domain lookup kept failing. So the issue is IPv6 connectivity. [root@da01 ~]# yum ...
0
votes
1answer
25 views

IPv6 client accessing IPv4 server w/ IPv6-unaware apps via CloudFlare w/ mod_cloudflare

Our server is currently IPv4 only. However we are using CloudFlare in front of it, and we would like to take advantage of the IPv6 compatibility it offers. In the same time we have some applications ...
24
votes
4answers
8k 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
0answers
22 views

Handling ephemeral port exhaustion on loopback IPv6

When running certain applications, like reverse proxies that proxy remote TCP connections to applications on localhost, it is possible to run out of ephemeral ports. You might have around 40,000 ...
9
votes
1answer
115 views

With IPv6, should we be assigning distinct IP addresses to each host name served over HTTP(S)?

With IPv4, it's pretty much a given that unless there is some specific need that warrants IP-based virtual hosting, name-based virtual hosting should be done to avoid needlessly exhausting the address ...
2
votes
1answer
1k views

Automatically acquire IPV6 address in CentOS 6

The network has fixed IPv4 address, and automatic acquired IPv6 address. Does anyone have an idea how to setup? Thanks a lot! I didn't use NetworkManager. The following is my setting, but it does not ...
0
votes
0answers
28 views

Can IPv6 connectivity between countries be unreliable?

I’m setting up IPv6 on my existing VPS and backup server. The VPS is located in Fremont on Linode, and the backup server is located in New Zealand. I have several VPSs within the Fremont data center. ...
4
votes
1answer
67 views

No IPv6 connectivity from docker container

i'm having serious problems enabling IPv6 in docker. Environment The host is running Debian Jessie. It's a virtual Server (KVM). eth0 has a statically configured address like w:x:y:z::1 in a ...
0
votes
2answers
16 views

setting IPv6 address for domain

I am quite new to the server business and I was wondering about a thing with the IPv6 addresses: When I assign an IPv6 address for my domain as an AAAA record: Do I assign a /64 address or do I ...
0
votes
0answers
63 views

How to assign ipv6 to my kvm guests route mode

Do you know how assign ipv6 global addresses to my KVM Guests?My ISP provider advertise an ipv6 prefix /64.I use libvirtd an here is configuration. When i restart virbr0 cant communicate with local ...
6
votes
1answer
427 views

Is this IPv6-link-local address (as reported by Windows) correct? If so, why?

From what I read online, an IPv6 link-local address is generated by taking the network interface's MAC address, inserting an FF:FE word into the middle of it, OR'ing in some additional bits, et voila: ...
0
votes
1answer
31 views

IPv6 connection between 2 computers doesn't work

I have 2 Linux computers with the following IPv6 addresses: 1: fe80::de0e:a1ff:fe15:13e0 prefixlen 64 2: fe80::2e0:4cff:feb0:f8d prefixlen 64 When on the first computer I try: # ping fe80::2e0:...
0
votes
1answer
59 views

SSH connection is slow and buggy when connected by IPv6

I noticed that my SSH session is not usable (random connection errors, hugh delay, etc.) when I'm connected by IPv6. I'm not connecting to my server by IPv4/IPv6 addresses directly. I use my domain ...
0
votes
0answers
66 views

Openvpn client frequently uses a different IPv6 address causes a unstable connection

I set up an OpenVPN server on IPV6 recently, it runs well, except for one thing: the client loses connection frequently for Inactivity timeout (--ping-restart). Here's the log infomation on the client....
0
votes
1answer
55 views

IPv6 - Allow incoming ICMP echo requests

So, we recently got our /48 prefix from our LIR, and started small-scale deploying it in a lab. What struck me as odd is that sites like http://ipv6-test.com/ insist that you allow incoming ICMP Echo ...
0
votes
1answer
291 views

Enable DHCPv6 in dnsmasq to distribute fixed range IPv6 addresses but failed

Help wanted! I want to create a AP in my Raspbian PI. And i choose dnsmasq as the dhcpv4 and dhcpv6 server. However, my laptop can acquire IPv4 successfully but fail to get a IPv6. Why the dnsmasq ...
27
votes
2answers
17k 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
0answers
19 views

Configuring Dante for multiple ipv6 proxies

I'm trying to setup multiple ipv6 socks5 proxies with a single server (not sure if this is possible) using dante. My end goal is to be able to connect the the socks proxy and have my visible ip to be ...
1
vote
1answer
125 views

UDP hole punching still required in IPv6, even without NAT?

Background (skip ahead for question) IPv4 needed NAT for address conservation. The firewalling properties of NAT were also beneficial for security. IPv4 NAT firewall rules are "block incoming packet ...
1
vote
1answer
57 views

IPv6 and LXC connectivity

I am struggling a bit on how to equip my LXC configuration with IPv6 currently. What's the setup? Ubuntu 16.04 LTS LXC2-beta from the Ubuntu PPA's (feature IPv6 connectivity) I use a netcup IPv6 ...
0
votes
1answer
41 views

IPv6 Subnet Delegation

I'm a bit confused on how to calculate IPv6 numbering. I have a /32 now and a VPN client that wants 6 x /48 from that /32. Could someone please simplify on how I can determine the points of the /32 ...
1
vote
2answers
140 views

Is it possible to use IPv6 in my local network if my ISP is using IPv4

My ISP is using IPv4 and assigns IP addresses via DHCP. Is it possible for me to use IPv6 in my local network/subnet, and if so is it even worth it to do so?
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votes
1answer
44 views

Best way to forward whole ipv6 /64 subnet range to single address (on Linux, obv)? [duplicate]

I want to forward incoming connections to any address within an assigned ipv6 /64 subnet on a VPS. Obviously I can't add a billion individual address to the interface, but perhaps I could use a bogus ...
0
votes
0answers
53 views

Cannot reach server using IPv6 Nginx Config

I was setting up SSL certificate and I tested them : https://www.ssllabs.com/ssltest/analyze.html?d=gfelot.xyz I was surprise to cannot connect with IPv6. I try in my browser : http://[2001:41d0:3:...
1
vote
1answer
70 views

Websocket reverse proxy with nginx: Error about request in server log, but works in browser

The situation I am running Etherpad, which is proxied via nginx. Etherpad uses Websockets with Socket.io. My nginx config is more or less this one. The location block for socket.io is this: rewrite ...
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votes
3answers
54 views

Which ipv6 address to use for AAAA record [closed]

My VPS provider provides me with one ipv4 and 17 ipv6 addresses. Is there any right or wrong ipv6 address from the 17 given to use as AAAA record ?
0
votes
1answer
66 views

why teredo IP Address keep changing?

I managed to configure teredo on windows 7 but I come up with one problem ... teredo IP address keep changing . I noticed that terendo stat keep change too , it moving from dormant to enabled and ...
2
votes
1answer
23 views

Adding an IPv4-only Domain Controller to an existing pool of Domain Controllers with both IPv6 and IPv4

We have an existing pool of Windows 2008 R2 Domain Controllers on-premises. These Domain Controllers have IPv6 and IPv4 configured. Now we need to add another Domain Controller that will seat on an ...
5
votes
3answers
33k views

What Causes IPV6 To Be Used Instead Of IPV4?

I have two servers both running Windows 2008 with IPV4 and IPV6 both running. If on server1 I ping server2 like this ping server2 The response I get is Pinging server2 [2002:9b08:a21::9b08:a21] ...
0
votes
0answers
96 views

IPv6 not working

I'm unsure as to why this is happening... anyway, let me start from the beginning The Setup 1 * Dedicated server with a /29 IPv4 and /48 IPv6 (from Nocix (DataShack)) 1 * CentOS 7 KVM host 1 * ...
0
votes
0answers
28 views

6in4 Tunnel with /80 Addresses

I want to setup my own 6in4 tunnel server on CentOS 7, my VPS ISP can only provide a /80 IPv6 block addresses while I can see most of tutorials said it requires /64 for client's DHCP server to work. ...
0
votes
0answers
24 views

Can't reach centos server after “Multicast listener report” IPV6

I ran into a problem that occurs only on a few servers. Every 5-6 minutes I lose connection to the server, and it get backs after a few minutes. In most cases it's a VM that is not reachable while ...
1
vote
2answers
81 views

Debian / IPv6: Default route expires after 1800 secs, loosing connectivity

I'm running Debian 8 on a vServer. After installing docker and enabling IPv6 i noted something strange. I don't know if docker has anything to do with this, it's just that i noticed this problem after ...