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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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.
Bevin's user avatar
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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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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,...
Andrea Borgia's user avatar
8 votes
2 answers
5k views

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 ...
Dan's user avatar
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1 answer
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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 ...
user3349687's user avatar
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1 answer
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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 ...
Paul Stelian's user avatar
2 votes
2 answers
8k views

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 ...
monkeber's user avatar
1 vote
1 answer
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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 ...
goulashsoup's user avatar
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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 ...
klepp0906's user avatar
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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 ...
klepp0906's user avatar
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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 ...
matveyfridman's user avatar
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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?
Vladimir  Zelenov's user avatar
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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 ...
Justin's user avatar
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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 ...
TJJ's user avatar
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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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1 answer
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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 ...
goulashsoup's user avatar
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3 answers
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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 ...
Legliez's user avatar
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1 answer
536 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 ...
goulashsoup's user avatar
1 vote
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101 views

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 ...
DatsunBing's user avatar
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1 answer
934 views

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 ...
Computer_User's user avatar
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2 answers
891 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 ...
user3145291's user avatar
1 vote
1 answer
8k 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 ...
Nicholas Hananeia's user avatar
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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 ...
Don4356's user avatar
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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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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 ...
x89's user avatar
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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 ...
shearlynot's user avatar
3 votes
2 answers
374 views

MacOS IPv6 "happy eyeballs" diagnostic CLI performance tool

"Happy Eyeballs" is the IPv6 feature (RFC8305) where the OS tests response time on IPv4 and IPv6 per destination and tries to optimize performance by choosing the "fastest" protocol for hostnames ...
Darrell Root's user avatar
2 votes
1 answer
2k views

Making an IPv6-only server available for IPv4-only clients via a proxy server

I'm in the peculiar situation where my home server (running Home Assistant, and a custom stack of other software) is behind CGNAT, and for some technical reasons, my carrier is unable to activate ...
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Can't ping IPv4 through Wireless Access Point repeater (while pinging IPv6 works)

I have this setup and problem: MAIN ROUTER | ----------> | Second router (acts as an access point repeater/extender) Can ping IPv4 - | ............... | Can't ping IPv4 Can ping IPv6 - | .............
Cristy's user avatar
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2 answers
798 views

rsync fails on MacOS for IPV6 addresses with "ssh: Could not resolve hostname"

Copying files with rsync to a remote computer using the remotes IPv6 address fails on MacOS 10.14.6. It seems that the IPv6 address is not correctly forwarded to ssh, but all my attempts using ...
fabianegli's user avatar
2 votes
2 answers
8k views

Disable IPv4 completely?

I want to move the whole home network to IPv6. It is possible, but is it practical to disable IPv4 on your machine in favor of IPv6 implementation as of writing? The first effect that I observed was ...
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1 answer
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Can't create multiple IPv6 tunnels

I am trying to create two IPv6 BGP tunnels with two providers (HE.net and Securebit AG). system does not allows to create more than one, whatever the connection I created first works fine. each ISP ...
Melan's user avatar
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1 answer
2k views

Why does having an iPv6-only contract with my ISP could affect online gaming?

What is the reason some Online Games nay not work properly when one's ISP provide IPv6 only? Some ISPs offer IPv4 at an extra cost. Are there alternatives to this to solve the gaming related problems,...
jmlorenzi's user avatar
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1 answer
227 views

IPv6 Global Multicast

Here is my interface configuration. inet6 addr: 2001:db8:0:f101::1/64 Scope:Global inet6 addr: fe80::20c:29ff:feaa:c19e/64 Scope:Link Link local works ok. ping6 -I eth0 ff02::1 But how ...
Mike Seeds's user avatar
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1 answer
327 views

IPv6 between 2 interfaces

I want to connect a PC with another device running linux with a USB cable (ethernet over USB with both nodes directly connected with the cable). The following works with IPv4. #PC : sudo ifconfig ...
Mathias B.'s user avatar
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0 answers
34 views

Share IPv6 with other PCs at the network

Since my new ISP does not yet provide native IPv6, I used a VPN-based tunnel to get an /80. This works well, but I'm not sure how to give other PCs/phones/etc in the network their own IPv6 from that ...
Michael Chourdakis's user avatar
0 votes
1 answer
191 views

How does the OS determine which interface to go for a duplicated link-local address range?

I have a Linux server with a lot of containers. Each container (with an isolated network namespace) generates a veth interface on the host, and the IPv6 routing table has a lot of entries for fe80::/...
iBug's user avatar
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2 votes
1 answer
2k views

Given two IPv6 addresses, how can I be sure that they are connected to the same router?

If I understand it right, two computers with IPv6 addresses that are connected to the same router share their subnet ID. However, that subnet ID can be given also to computers connected to other ...
Inna 's user avatar
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1 answer
965 views

DNS redirect to localhost

Is it normal ? I configured in Windows settings the IPv4 DNS of OpenDNS and the nslookup in CMD return for a domain [::1] or 127.0.0.1 from fe80::a63e:51ff:fe58:9ddd I tried the same on WSL and and ...
wxi's user avatar
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2 votes
1 answer
2k views

IPv6: Do two computers connected on the same Wi-Fi have the same IPv6 address?

I know that two computers that share the same network also share external IPv4 address. But what happens in case of IPv6? Do they share a subnet ID as well? In other words, how can I know that two ...
Inna 's user avatar
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2 votes
0 answers
404 views

Is ip possible to disable ipv6 for a certain network namespace?

I'm looking closely at network namespaces and because of a network setup with multiple gateways where only some of them are ipv6 enabled, I need to disable ipv6 for a certain network namespace that ...
marius-O's user avatar
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3 votes
1 answer
9k views

SOCAT IPv4 to IPv6 Routing

i got a small issue/question by using SOCAT on my vServer. My Problem is that i just got CG-NAT DS-Lite ISP wich provides me a private IPv4 Internal ISP IP and an native public IPv6 Adress. That means ...
Daniel Schmidt's user avatar
0 votes
1 answer
254 views

How can I manually assign a static IP in Ubuntu 18.04?

I have a VPS server running Ubuntu 18.04 which has a /64 subnet of IPv6 addresses. For the purpose of this post, let's call it 2601:aaaa:aaaa:aaaa::/64. The VPS website says I can use any address ...
Computer_User's user avatar
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0 answers
2k views

How to disable IPv6 on windows server 2019

I need to disable IPv6 on my machine as it wont work otherwise but when I go to it says I don't have permission when I am administrator! Please help. Im using virtual box for the server.
volcano_monster's user avatar
0 votes
1 answer
72 views

ipv6 addresses acting oddly on my ubuntu system

trying to get the basics of IPv6 working on my system. If I do: sudo ip -6 address show enp2s0 2: enp2s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000 inet6 2601:646:9780:...
Scott Franco's user avatar
0 votes
1 answer
314 views

IPV6 Record Vs. IPV4 DNS Record

I have been configuring my web application recently, and it came time to configure my DNS. I created an AAAA record over an A record, but only because I block SSH over IPv4. Is there any advantages ...
Whiteclaws's user avatar
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84 views

Use ipv6 tunnelling service with a pre-existing ipv6 address

EDIT: the earlier routing table does work. The problem is HE's server in LA. I did a test with a pure ipv4 server and it didn't work either. So I now change the question to how to make both native and ...
Turgon's user avatar
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2 answers
1k views

Archlinux Kernel: Module ipv6 not found

I found that I can't reach ipv6 network normally when I use archlinux: $ ssh root@[ipv6 addr] ssh: connect to host [ipv6 addr] port 22: Network is unreachable After further inspection, I think the ...
KInGcC's user avatar
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1 vote
0 answers
171 views

Different behavior when routing packets from localhost addr in IPv4 vs IPv6 case

Why is IPv4 routing from local address different than IPv6? Here is an ip route example that demonstrates it: # IPv4 case $ ip route get 1.2.3.4 from 127.0.0.1 RTNETLINK answers: Invalid argument # ...
tie's user avatar
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2 answers
456 views

how to enable host pc as router using slaac concept without radvd

We setup a IPv6 network with two ubuntu systems and we make one PC as HOST and other as ROUTER(based on the concept of SLAAC). The host sent the "Router solicitation" message, but the router pc not ...
dhaneesh lal.d.r's user avatar

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