Questions tagged [ipv6]

Version 6 of the internet protocol, which will replace version 4.

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3 answers
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How to disable temporary dynamic ipv6 addresses in Ubuntu 21.10?

By default Ubuntu 21.10 (should be the same for 20.04) does generate temporary/privacy IPV6 addresses. I would like to disable this behavior in order to make my computer into a server, and to do so I ...
1 vote
2 answers
764 views

Cannot disable IPv6 Autoconf and Privacy Extensions, but sysctl values are set to disable it

Why I cannot disable IPv6 autoconfiguration even if the sysctl values are set to this? net.ipv6.conf.default.autoconf = 0 net.ipv6.conf.default.accept_ra = 0 net.ipv6.conf.all.accept_ra = 0 net.ipv6....
0 votes
0 answers
11 views

AnyIP feature together with ndppd works on some VPS and doesn't on some others. Why?

I have VPSs mostly from the same provider but located in different places. They come with a single IPv4 and a /112 IPv6 subnet. I am trying to use AnyIP feature of Linux as described Here to make my ...
0 votes
0 answers
46 views

Ubuntu 20.04 - Browsers (Firefox & Chrome) Won't Use / Prioritize IPv4 Despite gai.conf Precedence - How can I prefer IPv4?

In /etc/gai.conf, I have the following: label ::1/128 0 label ::/0 1 label 2002::/16 2 label ::/96 3 label ::ffff:0:0/96 4 precedence ::1/128 50 precedence ::/0 ...
0 votes
0 answers
147 views

pppoe reconnect can't release old ipv6 address

I installed ubuntu 22.04 and enable ipv6 in pppoe network, but I found pppoeconf doesn't release old ipv6 address when ISP auto disconnect and re-connect with the network. Does anyone know how to ...
0 votes
1 answer
54 views

Can't ping dynamic IPv6 Xubuntu hostname from Kubuntu laptop

Ever since I updated my computers yesterday with the latest Ubuntu updates, I have been having issues with the computers communicating with each other. Originally, nothing (Either my mobile [Android], ...
1 vote
0 answers
68 views

Only IPv6 Link Local Address after Ubuntu update

Since recently running a software update on my Kubuntu laptop, I only have a Link Local address assigned for IPv6. The connection GUI IPv6 configuration looks normal and identical to my working ...
4 votes
1 answer
4k views

Is it possible to disable ipv6 using cloud-init?

I have a cluster of raspberry pi's and I am updating the os from raspian to ubuntu 20.04. I am able to configure a static ip address and name server, but I can not figure out how to disable ipv6. The ...
1 vote
1 answer
3k views

My Ping result are returning an IPv6 instead of IPv4

I am new in Linux. So, I am running dual boot Linux and Windows 11. All my OS is on the latest version. I try to ping google.com in Linux, but I get returned IPv6 instead of IPv4. Here is the ping ...
1 vote
1 answer
4k views

IPv6 network on Ubuntu Server 22.04

Can't seem to get the IPv6 network to work. Unfortunately, I decided to reinstall the system anyway. And IPv6 doesn't work for me either. Given: Dedicated IPv4 like: 45.80.XX.XX/32 and gateway 10.0.0....
0 votes
2 answers
5k views

DHCP3-server Don't want IPV6 address

Recently we upgraded from a windows 2003 DHCP server to a Ubuntu 10.04 DHCP3-server. The problem I am faced with now is that my windows 7 clients are now getting IPv6 ip address along with the IPv4 ...
1 vote
1 answer
5k views

Get IPv6 on PPPoE in Ubuntu

I have a strange situation here. If anyone can help, please do so. We're talking about a Linux Box running as Router using Ubuntu 18.04.3 LTS, with 2 interfaces: "lan" - which connects to my internal ...
1 vote
1 answer
907 views

How to effectively to set a global static ipv6 by `addr-gen-mode=eui64`?

I see there are a lot of questions about static ipv6, and privacy (like here, here, here, here and here), and I believe I have tried most of the available solutions (or at least those I was able to ...
0 votes
0 answers
123 views

ubuntu-22.04.3-live-server-amd64 LTS device gets public ipv6 assigned but not able to access it

Since I have Internet connection from an ISP that does not give public ipv4 and keeps the connection in cg-NAT but too my surprise I found out that it is assigning public ipv6 to all my devices. After ...
0 votes
1 answer
596 views

Ubuntu 22.04 can't set correctly ipv6 address

I'm trying to configure a Ubuntu 22.04 server with two networks, one with ipv4 and one with ipv6 (dual stack). this is my /etc/network/interfaces (The ipv6 address in my file are correct, here I ...
0 votes
2 answers
2k views

Why shows netstat an entry for ipv6 although it 's already disabled?

I've disabled ipv6 according to the description in: http://askubuntu.com/a/484487/229026, (As far I know, this article should also apply to Ubuntu 16.04) but netstat -nautp is still displaying the ...
0 votes
0 answers
90 views

Are ubuntu snap servers only accessible via ipv4-only?

I tried to apt update and snap refresh on an IPv6-only Ubuntu machine. The update worked fine, but the snap refresh hasn't. The shown error only mentions that it timed out. I tried three different ...
0 votes
0 answers
100 views

No IPv6 link-local address assigned to ethernet adapter, but is working on Wi-Fi

I have a fresh Ubuntu 20.04 install on a system with 2 interfaces - Ethernet (enp2s0) and Wi-Fi (wlp3s0). On the enp2s0 interface I set a static IPv4 address and wlp3s0 is using DHCP for Internet ...
2 votes
3 answers
15k views

A start job is running for Wait For Network to be Configured because IPv6 blocked

I have some freshly installed Ubuntu 22.04 servers. One is already running 22.04.1, just installed today. All of them are having the issue that "A start job is running for Wait For Network to be ...
90 votes
5 answers
113k views

apt-get update stuck: Connecting to security.ubuntu.com

When I run apt-get update on my machine it gets stuck at: 100% [Connecting to security.ubuntu.com (2001:67c:1562::15)] [Connecting to archive.canonical.com (2001:67c:1360:8c01::16)] I have made no ...
2 votes
0 answers
509 views

How to use local-link ipv6 for ssh?

I am able to remotely access my Ubuntu 22.04 PC from my windows' notebook at my local network using ssh ssh <username>@<public ipv6 address> -p <port> Or ping it without no problem. ...
25 votes
6 answers
76k views

IPv6 is working, but IPv4 isn't

I've got a new laptop running Ubuntu 16.04 that worked like a charm for a couple of weeks but has now lost its appetite for connecting to the internet via Wi-fi. I know it's not a problem with my ...
6 votes
2 answers
3k views

Why can't I ping over IPv6?

I can browse normally, I can create this question for example, apt update works fine, but when I was trying to install firebase using npm, I received a time out (npm ERR! network request to http://...
0 votes
0 answers
102 views

How can I enable IPv6 when microk8s is already installed?

I’ve read this article about enabling IPv6 on microk8s (which is a snap-package), but the documentation only talks about how to apply the configuration before you install microk8s; I installed it ...
3 votes
2 answers
10k views

No answer section using dig

I've got an assignment from school to setup a DNS server with 2 name servers in ubuntu server using IPv6, but I'm not very good at it. When I use the dig command, It doesn't show an answer section. ...
15 votes
4 answers
38k views

How do I add an additional IPv6 address to /etc/network/interfaces?

this question How do I add an additional IP address to /etc/network/interfaces? mostly asks what i want except that i want to add more IPv6 addresses in the same interface eth0 without incrementing to ...
0 votes
0 answers
51 views

IPv6 routing issues with Vodafone CZ modem

IPv6 used to work for me but something must have changed either in Ubuntu/Xubuntu or in the ISP (Vodafone CZ) modem about two months ago. When I set the Network Manager UI to "Automatic", it ...
0 votes
1 answer
64 views

Turn off IPv6 resolution for particular URL only

I'm having an issue with registry.npmjs.org -- When I attempt to access it through the command line (e.g. implicitly by using the npm command, or when doing a ping registry.npmjs.org), the access ...
2 votes
1 answer
1k views

Ipv6 vs Ipv4: is there a way to force ipv6 use?

Ubuntu/Linux beginner here, so I was wondering if there's any way to force Ubuntu to prefer IPv4 or IPv6 when resolving a name (ex.: google.com has ipv4 and ipv6 addresses. is there any setting which ...
0 votes
0 answers
161 views

Problems enabling IPv6

I have two Ubuntu Servers on my home network: one acting as a router/gateway (Router), and the other acting as a media/multipurpose server (Server). I've been trying to enable IPv6 on both, but I'm ...
-2 votes
1 answer
2k views

Ping ipv6 localhost fails address family for hostname not supported

A year or so ago I tweaked my IPV6 config to disable it, or at last that's what I tough. I don't remember which commands executed or which articles I read. Currently I'm at LM Cinnamon 21.2 (Ubuntu 22....
0 votes
0 answers
142 views

Ubuntu 20.04.2 LTS lost internet connectoin out of sudden

My PC is connected to a router. The router has been working all the time and had internet connection. Several days ago I noticed that I suddenly cannot connect to my PC through the router admin page ...
0 votes
0 answers
50 views

How can i ssh from one ubuntu machine to another with a cable (no router) and communicate over ipv6, without configuring anything?

What are the minimal steps necessary to do ssh and rsync over ipv6 between two ubuntu machines connected only by an rj45 (cat 5 or cat6) ethernet cable? (So no router nor even a switch is involved, ...
0 votes
1 answer
199 views

netplan - trouble converting gateway6 to "to/via" directive

I'm attempting to update my netplan config to use a routes directive instead of gateway6 since gateway6 is deprecated. My working configuration file looks like this: # /etc/netplan/51-cloud-init-ipv6....
4 votes
1 answer
7k views

What is setting my IPv6 addr_gen_mode?

I have just implemented my own DynDNS service that updates the AAAA records with my DNS provider using an IPv6 prefix and a bunch of MAC addresses of LXD container macvlan interfaces. This works well. ...
3 votes
1 answer
2k views

Manually set an IPv6 address via the GUI

[Ubuntu 20.04.4 LTS] I am trying to manually assign an IPv6 addr via the GUI, but whatever I seem to enter for the Prefix, it says it is invalid. Here's an example: I've also tried the following for ...
0 votes
1 answer
250 views

Terminal has network (DNS?) issues but browser works fine. ipv6 issue?

EDIT: It seems it might be a cable modem issue: according to https://test-ipv6.com/ ipv6 is not working both in Ubuntu as well as windows (dual boot, same workstation), and neither on my smartphone ...
0 votes
0 answers
155 views

Ping6 link-local address with -I interface is throwing warning source address might be selected on device other than

OS: Ubuntu 20.04.5 LTS Ping6 to a link-local address with -I option throwing a warning source address might be selected on device other than <>. Can someone tell why would ping6 look for a ...
2 votes
2 answers
6k views

(Ubuntu 16.04) IPv6 not working [closed]

I'm still new to linux/ubuntu, so please bear with me. I'm trying to get IPv6 working. IPv4 (and my internet) works fine, but when I test for IPv6 on ipv6-test.com it says I don't have IPv6: My ...
3 votes
1 answer
10k views

commandline request to get ipv6 address as from test-ipv6.com

https://test-ipv6.com gives me an ipv6 address as: "Your IPv6 address on the public Internet appears to be 2604:...." How can I get that information through the commandline? For IPv4 I can do ...
1 vote
2 answers
1k views

How to disable IPv6 redirect?

I need to disable IPv6 redirect in my system (a router), and I got this error: sysctl -w net.ipv6.conf.all.send_redirects=0 sysctl: cannot stat /proc/sys/net/ipv6/conf/all/send_redirects: No such ...
0 votes
0 answers
443 views

systemd-networkd does not send IPv6 route advertisement (send_ra) when using VLANS

I am using systemd-networkd for network configuration and the problem I am seeing is that ICMPv6 RA (Route advertisements) are not being sent on the physical (untagged) LAN interface (eno1), while it ...
10 votes
3 answers
6k views

ipv6 tunnel in Ubuntu 17.10?

I used to be able to do the configuration below with no issues in /etc/network/interfaces but now it's not picked up anymore. How do I configure a ipv6 tunnel now? I see see the new netplan software ...
0 votes
0 answers
170 views

Ubuntu 22.04LTS - Wifi issue low network speed because of IPv6

I upgrade from Ubuntu 20.04 to 22.04LTS. I noticed that my wifi speed slowed down from 40 Mbps to 1 Mbps(max) after one hour. Again, if I reboot then it worked fine. After trying multiple suggestions ...
6 votes
1 answer
5k views

failure to resolve DNS query using IPv6, e.g. host -6 gnu.org, dig -6 gnu.org

Why doesn't the default Ubuntu LTS install allow host -6 gnu.org or dig -6 gnu.org to work? Welcome to Ubuntu 22.04 LTS (GNU/Linux 5.15.0-27-generic x86_64) $ host -6 gnu.org ;; communications error ...
0 votes
2 answers
270 views

IPv6 source address selection with addrlabel and netplan

I have configured my Ubuntu 22.04 via netplan like this: network: version: 2 renderer: networkd ethernets: enp3s0: addresses: - 192.168.10.10/24 - 2001:db8:6789::10/64 ...
0 votes
0 answers
120 views

IPv6 "Activation of network connecting failed" [WiFi] and many urls unreachable (incl snap)

The first thing I noticed was that snap could not connect (running release 22.10): Failed to find refreshable snaps: status-code=500 kind=(null) message=cannot list updates: persistent network error: ...
2 votes
0 answers
366 views

IPv6 issues Ubuntu 20.04 server

I have a server running the following software: Ubuntu 20.04 cPanel 106.0.13 PHP 8.1 MySQL 8 Litespeed Web Server Elasticsearch 7.17 Redis 7 I am running a magento 2.4.5 store on this server which ...
0 votes
0 answers
325 views

Trying to use a tunnel from HE but some IPv6 connectivity is broken

I have a server from Kimsufi (OVH Eco branch) but unfortunatelly they only provide a /128 IPv6 block. So, I decided to use a Hurricane Electric (HE) tunnel to have a /64 IPv6 block. I've followed HE ...
2 votes
3 answers
928 views

Route all traffic on port 443 (IPv4), to an external IP address on port 80 (IPv6)

I want to host a website from home using the Yggdrasil network. Yggdrasil gives me a static IPv6 address at home (even if behind a DNS). However "regular" users cannot be routed to that IP ...

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