Questions tagged [ipv6]

Questions about IPv6, the newest version of the Internet Protocol. This tag should be used when asking about personal/home network IPv6 addressing, or basic IPv6 knowledge. Questions related to company-grade IPv6 networks are off-topic and should be asked on Network engineering SE.

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9 views

Microsoft Azure VPS - has no IPv6

I have VPS on Microsoft Azure server. I need to redirect one AAAA DNS record to my VPS but I cant find any IPv6 address. Is it possible to generate IPv6 from IPv4 or how can I find it? Here is the ...
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How do I assign IPv6 addresses to the interfaces of my linux-based router?

I'm using a commodity PC running Ubuntu Server 18.04 as the router for my home network. This has been working great for me for years with IPv4, but I've been trying to make it dual-stack, and I'm ...
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Wake on lan with Easybox & IPv6

Currently I am using TeamViewer to control a remote pc. Now I also want to be able to start that pc remotely. I was thinking about using the TeamViewer Wake on Lan fuctionality, but any other solution ...
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Debugging unreliable IPv6 connection

On our VPS we face connection issues with IPv6, hopefully someone can help to debug the issue. Pings fail at first and succeed later: 2020-06-01 23:20:55 <user>@<host>:~# ping -6 google....
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Which IPv6 basic firewall rules (cisco asa) are necessary on your internet breakout router when using global v6 addresses in your network?

I am making a small virtual lab setup to do some testing with IPv6 global addresses only. I have a simpel setup: 1 Router/firewall (asa) to break out to the internet DMZ with 1 webserver with dns (...
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How do I traceroute an ipv6 address with mtr?

I'm trying to troubleshoot a connectivity issue to an IPv6 addressed host using mtr, however, despite using the -6 switch, it fails with the error: mtr -6 2001:db8:1d4f:10::1 mtr-packet: Failure to ...
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Getting “already seen ipaddr” error when adding 2 secondary IPv6 addresses on a VLAN subinterface

How many secondary IPv6 addresses are allowed on a VLAN subinterface in CentOS 7? With the config below I only get the former IPv6 address successfully assiged to ens224.2015 while the latter IPv6 ...
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Disable IPv6 using CMD or Powershell on Windows 7

I'm trying to disable IPv6 connectivity on Windows using either command line or WMI api without restarting the computer (I know about adding an entry into Windows registry, but this requires rebooting ...
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How to get a static IPv6 global unicast address for myself (an individual)?

I want to get one static IPv6 Global Unicast for myself. I want all the three parts (the 48–64 bit prefix (i.e. address range) given to a customer by ISP; the 0–16 bit subnet ID chosen by the ...
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I can't access most sites using IPv6. Is it an issue with “Level 3” network?

Note: I'm not a network expert, and I don't have deep knowledge about IPv6. Recently, IPv6 connectivity seems not to be working here. (Tested through Firefox) The funny thing are, when doing a ...
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I want to stop a linux network interface from getting its route from a router advertisement while still forwarding

I am trying to set up my raspberry pi as a router. I am connecting to Spectrum internet. Spectrum uses dhcp for ip4, and there's no problem there. They use router advertisements for ipv6. So, my ...
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IPv6 delegated LAN prefix length - Inconsistency in RIPE NCC assignment policy

As far as i know it is recommended that an ISP delegates a 56 bit IPv6 prefix (/56, previously /48), so that the host can subnet the interfaces on its LAN links. RFC 7368 - IPv6 Home Networking - 3.4....
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what is % after IPv6 address [duplicate]

I know format of IPv6 but i can't find what is % after IPv6 This is From Ethernet adapter VMware Network Adapter VMnet8:    DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1  ...
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IPv6 Default Route not Populating

This will probably have a really simple answer but here it goes. I am running Amazon Linux 2 on EC2 for a small personal server on AWS. IPv4 and IPv6 were initially set up and working. I then ...
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Is IPv6 Inverse Neighbor Discovery supported in Linux

Does Linux have IPv6 Inverse Neighbor Discovery support. Already checked in online documentations and support portals, but couldn't get any information regarding this.
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FRITZ!Box DynDNS w/ dynv6.com not updating prefix

I can configure dynv6.com in my FRITZ!Box with german tutorial from here: fritz!box configuration as soon as my router gets a new prefix in the night I cannot access my fritz!box and exposed host ...
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How do I change the public IPv4 and IPv6 adresses via CMD?

How do I change the IPv4 and IPv6 addresses via CMD? I saw all other articles, but they seem to change both the private and public IP addresses.
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ssh: “from” authorized host equivalent when using IPV6?

I am running Amanda to backup a few local hosts, among them my laptop. For security reasons, the laptop is using ssh as transport and there is a "from" option like this: from="server.localdomain,...
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How should I distribute IPv6 addresses to a home network?

(this was flagged as off-topic over at Network Engineering, and suggested to move here) I have finally got an IPv6 address for my network. Being able to do VoIP and peer-to-peer networking without ...
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How to change the IPv6 link local address of an interface in Linux?

I want to remove the default IPv6 link-local address of an interface and want to replace it with a customized IPv6 link-local address? Can you help me here? If I assign a new link-local IPv6 address ...
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How to implement ipv6 while keeping ipv4 with reverse proxy?

I'm configuring ipv6 for containers on proxmox. All the containers should be accessible from the outside, so, I guess, I need to configure GUA (Global Unicast Address) for each of the container. ...
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156 views

How can I give IPv6 to WSL2?

Originally posted on Network Engineering EDIT: This network configuration is no longer reflecting the network I'm connected to now. I'm switching ISPs (not of my own volition, the old IPv4-only ISP ...
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Disable IPv6 connectivity on Windows without restarting the computer

I am trying to disable IPv6 connectivity on my computer without restarting it, I saw that some VPN applications delete routes from routing table in order to disable IPv6 connectivity, but when I try ...
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Requirements for IPv6 Customer Edge Routers - Why is router required to initiate DHCPv6 prefix delegation on WAN-side when RA was received?

RFC 7084 describes Basic Requirements for IPv6 Customer Edge Routers. One of those requirements on the WAN-side is the following: WPD-4: By default, the IPv6 CE router MUST initiate DHCPv6 prefix ...
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How do i set a static route to bypass VPN for a website using my ipv6 address?

So i use a tracker which doesnt allow browsing of its site using a vpn. It is advised to add a persistent route to circumvent and allow browsing while connected to a vpn which I have done using ...
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60 views

Which windows firewall rule blocks ping/icmp on the ipv6 side?

I have been messing with enabling LAN side ipv6 on my gateway. I was doing some performance testing that began with ipv6-test.com and their side by side ping test of ipv4 and ipv6. I noticed both ...
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SSH into Raspberry Pi on IPv6 network

First of all: I am a network noob, so excuse the noobness of my question. I want to SSH from my Mac into my Raspberry Pi within my local network. I have an IPv6 network and cannot change to IPv4 ...
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IPv6 - When is the “Managed address configuration” flag (M flag) of a Router Advertisement (RA) actually used?

Before creating a Non-Temporary Global address with DHCPv6 (RFC 8415) or SLAAC (RFC 4862) a Link-Local address has to be created and as far as i know, this mostly happens with SLAAC in which an ...
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IPv4-in-IPv6 Tunnel on Windows

Linux systems can set IPv4-in-IPv6 Tunnel how it described there https://thenybble.de/projects/ipip6.html. Is there a way to do it on Windows and how?
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ASUS Router ipv6 Firewall setup - allow all inbound on certain port

Situation: Trying IPv6 for first time. Stable setup at home on IPv4 and starting to tinker on the v6. Have ASUS AC-68U router connected to broadband box and firewall/routing all setup for a few ...
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Can't resolve hosts in browser. DNS seems good. Issue crosses browsers. Other PCs ok

I am wondering why I can't browse most websites. I can reach Google sites, Netflix, and Facebook, but nothing else. Everything works on other sites. This is true of Edge and Chrome including in ...
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My friend cannot ping my IPv6 getting “Ping: transmit failed. General failure” even though servers online can do it just fine

I am attempting to set up a game server on my PC at home and obviously, I need people to be able to connect to my machine. As far as I know, a good way to check the possibility of connection is by ...
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Why is Windows preferring IPv4 when using VPN split tunnel with OpenConnect?

I am connecting to a VPN using OpenConnect 8.03 on Windows 10. The profile of the VPN only sets a route for the subnet of the VPN. All other IPv4-traffic is still routed via my normal connection. My ...
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Why my IPv6 address disappear after 1 hour?

when I connect to my router, I get assigned with IPv4 and IPv6 and it works. But after exactly an hour or so, my IPv6 address disappears and now I only can connect with IPv4. If I re-connect or reboot ...
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How to set an IP-address range in ufw for ipv6 addresses?

I would like to configure ufw so that it allows SSH connection from a certain IP address range. E.g. from a certain city. Here is what I would do for ipv4: sudo ufw allow from 210.023.0.0/16 to any ...
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How is a link-local address created when duplicate address detection fails in IPv6 Stateless Address Autoconfiguration (SLAAC)?

When Stateless Address Autonconfiguration (SLAAC) RFC 4862 is used to create a link-local address based on the interface identifier (Modified EUI-64), before the address is assigned to an interface ...
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Can a /44 (global) IPv6 subnet be routed on the internet

I read that the smallest internet routable subnet in ipv6 is a /48. I am a bit confused with the word smallest here, does it mean: 44 Is smaller than 48 44 Is bigger than 48 because it has more IP ...
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48 views

When DHCPv6 is used in a home network what is the initial Identity Association requested by hosts?

Lets assume the M-Flag of a NDP Router Advertisment Message is set so that DHCPv6 is used for address assigment and Stateless Address Autoconfiguration was used to create a link-local address for the ...
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194 views

What is the initial source address used by a DHCPv6 client when DHCP is used for address assignment?

When DHCPv6 is used for address assigment (determined by the M-Flag of a NDP Router Advertisment Message) the host obviously does not have a valid link-local address yet. For Stateless Address ...
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ISP Upgraded to IPV6 and I can no longer use ping, or other services

My ISP has been having trouble with their ADSL service for a few months, so my router automatically switches over to use their wireless service. When on wireless my public IP address is an IPV6 ...
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OVH VPS (Ubuntu 18.04) can not connect with IPv6

I have a VPS server from OVH running Ubuntu 18.04 LTS and I noticed today that the IPv6 was not working at all, nor was the IPv6 assigned to me listed when I looked in ifconfig. Then I followed the ...
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42 views

Network IPv6 directly addressing a local server from the Internet

The ISP was running out of IPv4 addresses so he gave us an IPv6; Now I have a static IPv6 address, which is good. According to the IPv6 description I should now be able to directly address any ...
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Where can I see the IPv6 addresses that wide-dhcpv6-server assigns to clients on the network?

I've set up a Raspberry Pi 3B to act as a IpV6 router using wide-dhcpv6-server. I'm connecting my pi via Ethernet to a level 2 switch. I then connect other devices to this switch via Ethernet. From ...
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69 views

Using Windows Remote Desktop with ipv6 router

(asking here as it seems more appropriate than the main stack exchange) I'm trying to use my home computer from work, since I am doing computational biology work that needs CPU power, and my i9 is ...
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possible bot or broken ipv6 slowing connection speed

I have a relatively new netgear c7800 cable modem wifi router connected to 23 various items ranging from wall switches, echos, phones, tablet, and computers. My computer is a Windows 10 lenovo (2 ...
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Disabling all network interfaces for a specific user on login [Debian]

Problem: In my lab, there is a specific device that for security reasons cannot be used while the interfacing computer is connected to the internet. The interfacing computer is a Lenovo x120e running ...
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67 views

Is it possible to have “on the fly” MAC spoofing with IPv6 for encryption/anonymization purposes?

I am in school for network security and advanced Cisco, and one of my classes this semester we picked up on IPv6 as part of the MS Server 70-741 Exam. When reading through the textbook and noticing ...
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124 views

How to force the usage of IPv4?

I need to check timings on my Ubuntu machine by ping www.xyz.com but using IPv4 only. How can I check if I have both (IPv4 and IPv6) connectivity? How can I force usage of IPv4 for this particular ...
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netsh interface ipv6 show prefixpolicies equivalent for Linux?

I'm hoping to identify the IPv4/IPv6 preference order configured on a host. As per the title, is there an equivalent of the following Windows command on a Linux host? netsh interface ipv6 show ...
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How to configure static NDP entry in linux?

I have a linux host and I know the link layer address of the gateway. How can I disable automatic neighborhood discovery protocol? And how can I configure the linux host such that, packets to any ip ...

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