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, ...

learn more… | top users | synonyms

0
votes
0answers
26 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 ...
-1
votes
0answers
19 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 ...
-1
votes
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
votes
0answers
32 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-...
-2
votes
1answer
41 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
28 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 ...
3
votes
0answers
56 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
votes
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; ...
1
vote
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 ...
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 ...
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 ...
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 ...
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. ...
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
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
61 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 ...
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 ...
6
votes
1answer
425 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
58 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
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
53 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
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 ...
4
votes
1answer
65 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 ...
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 ...
1
vote
1answer
123 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 ...
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
votes
1answer
43 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
51 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
2answers
137 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?
-1
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 ...
1
vote
1answer
68 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 ...
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
80 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 ...
-1
votes
1answer
68 views

“Ipcalc -n ipv6_addr” command is giving error

I am trying to calculate network address of Ip address by using Ipcalc command. when i am using ipcalc -n ipv4 address,then it is running fine and give the network address for the IPv4. But when i ...
0
votes
1answer
34 views

Allow outgoing IPv6 connections for VPN clients

I have the OpenVPN server. A client connecting to this server receive an internal IPv4 address (10.2.52.X) and an external IPv6 address. I need to perform a masquerading (NAT) for IPv4 but I don't ...
-1
votes
1answer
61 views

Building router with one ethernet interface

Good day! I have 2 servers in datacenter and I want to use one of them as router for another instead of default gateway provided by DC. Both servers have one ethernet interface called 'eth0' with ...
0
votes
0answers
48 views

IPv6 interface not responding to neighbor solicitations, DHCP involved too

ip addr shows: 2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000 link/ether 02:6d:5e:86:29:49 brd ff:ff:ff:ff:ff:ff inet X.X.X.X/...
0
votes
1answer
141 views

Hyper-V vm can ping host but host cannot ping Hyper-V vm?

When ping host from hyper-v VM, it works both with ipv4 or ipv6. Pinging MyHost [fe80::3549:ee49:a75c:619c%9] with 32 bytes of data: Reply from fe80::3549:ee49:a75c:619c%9: time<1ms Reply from ...
0
votes
0answers
56 views

Kamailio as TCP-only SIP register and relay

I have a rather complicated setup in which I'd like to run a SIP server. In general, I want to run an IPv6-only Kamailio SIP-server on internal network and have outside SIP-clients be able to make ...
0
votes
0answers
94 views

IPv4/IPv6 dualstack setup in Debian/Ubuntu via preseed

I use preseed to provision my Ubuntu 16.04 installation. It has the following options to set up IPv4 or IPv6 address # Static network configuration. # # IPv4 example #d-i netcfg/get_ipaddress string ...
1
vote
1answer
51 views

How to redirect traffic through IPv6 IPSec (strongswan) gateway?

I'm trying to set up IPSec secured connection to the gateway. Have three hosts: A: eth1 - fec0:1::1/64 B: eth1 - fec0:1::2/64 eth2 - fec0:2::2/64 which is gateway between A and C; forwarding is set ...
1
vote
1answer
234 views

OpenSSH adds <IPv6>%2 to known_hosts

When I connect to a CentOS 7 host with IPv6 my ssh client always adds <IPv6 host addr>%2 to known_hosts even though the host key for this host (with the host's IPv6 address) is already present ...
17
votes
2answers
1k views

Is an IPv6-only MTA possible yet?

Has anyone had tried to run an IPv6-only SMTP engine? Pretty much everybody with any sense has IPv6 configured for major front-end servers. I was curious if anyone had tried to run an IPv6-only MTA ...
1
vote
1answer
46 views

IPv6 and ESP as a next header

I'd like to know how to parse IPv6 header and get offset to TCP header and its payload. I know that IPv6 has fixed base header. I know also that there are several extension headers in IPv6 - among ...
1
vote
0answers
30 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 ...