Questions tagged [ipv6]

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

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Disable IPv6 before launching Citrix Workspace

I am unable to establish a Citrix session if I have an IPv6 address. After spending a few hours going down the certificates rabbit-hole, as guided by other threads that also related to the unable to ...
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wget connection stuck - log file location? [closed]

A client of mine could not download anything via WGET from any website. He didn't get any error messages in the terminal. The connection simply remained in the "connecting" status. It did ...
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Get EHOSTUNREACH for registry.npmjs.org IPv6 address

My laptop is running 22.04, and my DSL router allows for IPv6 addresses on the LAN. There is not a public IPv6 address for my network, only an IPv4 address. I am able to reach all kinds of addresses ...
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How to fix an Ubuntu server losing its IPv6 address without any traces inside the logs

I have Ubuntu 22.04 LTS (GNU/Linux 5.15.0-1008-raspi armv7l) running on a raspberry Pi 3. For some reason, after around 2 days of uptime, it starts randomly removing its global IPv6 address. The IPv6 ...
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Need help with WOL and IPV6

it's been a whole day since i'm trying to configure WOL on my Ubuntu server machine and i'm still stuck on some points : Basically i would like to be able to wake it over the internet and my SFR box (...
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How to allow ipv6 to a specific port with ufw

I recently tried to deny all traffic to a specific port, then allowing it only to a specific ipv6 by using « ufw allow from ipv6 to any port 843 » But It don’t work, and I dont know why since it works ...
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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 ...
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Dual stack IPv4/IPv6 on 18.04 LTS and 20.04 LTS kills website user experience, unclear how or why

I've been running IPv6 enabled (dual stack) hosts for years. Ubuntu back to at least 16.04, maybe 14.04 and to present day. I figured this was settled technology and there were no gotchas in our ...
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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 ...
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Creating gre tunnel with netplan, no scope link ipv6 address

I have created GRE tunnel using netplan and ipv6 is not working properly (I am trying to run ospf3 over GRE tunnel and it is not working without scope link ipv6 address), it appears to be missing ...
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Ipv6 Environment with MAAS

I am setting up Ipv6 environment with MAAS , looks like when I configure Ipv6 address on same interface where Ipv4 configured and tried to deploy a machine , Machine getting only Ipv4 address not Ipv6....
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Network Manager creating a wired ipv6 connection on its own. Recreates the connection a few minutes after disconnection

Ubuntu 20.04. A wired ipv6 connection is being added by Network Manager. I cannot seem to stop it. The connection is recreated a few minutes after I disconnect it. It creates a new wired connection if ...
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incoming IPV6 connections work on pi but not on Ubuntu

Summary Incoming IPV6 connection works on the pi but not on the Ubuntu. Details My home network is: (internet)--|box|---+--------+ | | |pi| |ubuntu| ...
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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 ...
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How do I use PuTTY to connect through SSH to Ubuntu Server 20.04.3 LTS

I'm trying to connect to my server terminal thru SSH, before at my home everything worked fine, on my Ubuntu server terminal I did ifconfig, get the ipv4 IP address and connect to it. Now I brought my ...
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How do I show all ipv4 and ipv6 addresses by using grep

I'm trying to grep inet addr and inet 6 addr from ifconfig. I can grep inet addr or inet6 addr alone only. How can I show both IPV4 and IPV6 addresses in one command?
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Assigning IPv6 address to user

Is it possible to assign a different static IPv6 address to each user on the system?
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Enabling IPv6 on interface

I have a lot of trouble enabling IPv6 on physical interface, everything seems enabled or not disabled: $ ifconfig enp1s0 enp1s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet ...
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Cannot accept IPv6 router advertisements

No matter what I try, my Ubuntu Server machine (bare metal) won't accept router advertisements. I am able to pull an IPv6 address from DHCP, ping that address from another machine, but trying to ping ...
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NetworkManager: IPv6 Automatic Modes

I was looking at the IPv6 config of my Ethernet connection in NetworkManager's connection editor. It seems there are 3 automatic modes alongside other options: Automatic Automatic, addresses only ...
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Ubunut 21.10 IPv6 only KVM/qemu VM With CloudInit: no ping / ssh possible

I am running Proxmox and i have a Ubuntu 21.10 VM with only a public IPv6 address that is setup with CloudInit (using ubuntu-21.10-server-cloudimg-amd64-disk-kvm.qcow2). So no IPv4 address. When i try ...
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Internet doesn't work on specific network after connecting to enterprise network

Ubuntu 20.04 LTS Everything worked flawlessly before. Connected to a WPA2 Enterprise + PEAP + MSCHAPv2 network at work. After that, WPA2 Personal network stopped working at home. It authenticates ...
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Add IPv6 Loopback Adress on Linux Ubuntu

I know the way for IPv4 addresses: sudo ifconfig lo:0 127.0.0.2 netmask 255.0.0.0 up where lo:0 is the new identifier and 127.0.0.2 is the new IPv4 loopback address, but for IPv6 it seems to be a lot ...
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Disable both IPv4 and IPv6 on a specific interface

Using Ubuntu 21.10, SoftEther docs recommend disabling IPv4 and IPv6 on one of the two Ethernet interfaces used for the local bridge network adapter. Here's my /etc/netplan/01-network-manager-all.yaml....
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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 ...
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Docker containers can't resolve host on Ubuntu

I have installed Ubuntu server with the latest patches, and I switched to AT+T, and I suddenly was unable to resolve external sites from inside of a Docker container. How to resolve this? I noticed ...
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how to install ipv6 service on Ubuntu 18.04

I was trying to add ipv6 via following command, but it was showing error "No support for INET6 on this system." sudo ifconfig ens224 inet6 add fd05::a0c:3301/124 and it was showing null via &...
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Disabling IPv6 leads to black screen on reboot

I tried disabling IPv6 using /etc/sysctl.conf and after a reboot I cannot get into any of the two DE that I have installed. Tried both GNOME and KDE Plasma. The SSDM login screen does show up but ...
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Incorrect behaviour? Setting wireless connection IPv6 method to "Disable" doesn't disable IPv6

Ubuntu 20.04.3 LTS: When I set "IPv6 Method" in the IPv6 settings tab of a wireless network to "Disable", I'm still seeing that the interface is getting an IPv6 address. Setting ...
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ubuntu doens't resolve usb device name

I have a ARM SBC running linux and configured to be connected to a pc via USB using rndis gadget. Inside my device I configured dnsmasq to provide to the host pc an ipv6 address, I also configured the ...
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Where can I find the default IPv6 config location on Ubuntu 20.04 Server?

I just installed an Ubuntu Server 20.04 via the installation manager. I defined a static IPv4 address and left Ipv6 untouched. After starting the machine, I can see my static Ipv4 and also multiple ...
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Ubuntu 20.04 server suddenly can nolonger connect to anything at all on IPv4

... but I can SSH and use webmin on it just fine over IPv4?? I cant ping anything at all and of course DNS just flat fails as a result. The only addresses I can ping are local 127.0.0.xx and the ...
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getaddrinfo() return both ipv4 and ipv6 while local system has ipv4 only

I use getaddrinfo() to get list ip address from a domain which support both ipv4 and ipv6, but the local system support ipv4 only and I want to query ipv4 only. Any one have solution? there is my ...
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Unable to disable dynamic IPv6 address

I have a bridge interface named vms with one IPv4 and one IPv6 address statically assigned via netplan. I have configured radvd to send router advertisements on this interface to assign dynamic IPv6 ...
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ufw is listening to tcp6 on OCI and cloudflare ssl certificate

netstat -ntlp | grep LISTEN tcp 0 0 127.0.0.xx:53 0.0.0.0:* LISTEN 809/systemd-resolve tcp 0 0 0.0.0.0:22 0.0.0.0:* ...
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PHP-FPM upstream error with ipv6

I have just installed the latest Nginx with PHP7.4-fpm on a fresh Ubuntu 20.04.2 server. I added a virtual host that has a WordPress site on it and it is loading fine but I noticed the nginx logs ...
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Transmission advertising IPv6 address despite not being bound to it

I am using Ubuntu 20.04.2 and transmission-daemon 2.94-2ubuntu3. Transmission is connected to a VPN over IPv4, and that works fine, except that — despite passing --bind-address-ipv6 fe80:: to ...
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Can't browse IPv6 Websites

I am using 20.04 LTS, but suddenly I can't browse websites which has their IP addresses as IPv6, for example (hepsiburada.com). Even apt update command no longer works, because Launchpad is ...
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IPV4 Connectivity isn't working, IPV6 working fine

I have set up a Raspberry Pi with Ubuntu Server 20.04 LTS, however I run into some connectivity issues, especially regarding IPV4. It seems however that IPV6 is working correctly. Here is an example ...
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IPv6 and OpenVPN

I have a question about a 'theoretical' configuration, I wanted to see if it is achievable and further if it is common practice I am not new to Ubuntu but I am no pro, I am using Ubuntu server 20.04 ...
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ipv6 link local addresses in /etc/hosts

I'm trying to ssh to a server on my LAN via ipv6. in order to save time and not to type ssh fe80::301b:7acc:bc33:a191%wlp1s0 I tried to define the host in /etc/hosts. The problem is that with link ...
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Ubuntu keeps disabling ipv6 after kernel updates

Every time I have kernel updates and I install them, I find the GRUB_CMDLINE_LINUX="ipv6.disable=1" added to my /etc/default/grub. I need to manually delete it every time, update-grub and ...
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Can't run ipv6 tunnel - add tunnel "sit0" failed: No buffer space available

I stack with the error "add tunnel "sit0" failed: No buffer space available". /etc/network/interfaces auto lo iface lo inet loopback auto eth0 iface eth0 inet dhcp iface eth0 ...
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Make server globally reachable on IPv6

I've been hosting a globally-reachable Minecraft server on my desktop Ubuntu computer at home for about 1 month, on IPv4, using my ISP's router NAT configuration. Recently, my ISP (SFR, a French ...
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Docker daemon does not bind to TCP6

I have a composition with the default networking configuration and a definition such as: services: myservice: image: someimage restart: always ports: - 80:80 - 443:443 The ...
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Disable IPv6 on Ubuntu 20.04

Simple way that worked for a very long time was adding in /etc/sysctl.conf net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 Afterwards ...
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IPv6 temporary address not renewed

There something strange with my debian machine : IPv6 temporary addresses are not renewed at the end of their lifetime, they become deprecated and useless : tchupy@Raspihole:~ $ ip -6 addr 1: lo: &...
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IPv6 is disabled, but netfilter-persistent complains with `ip6tables-save v1.6.1: Cannot initialize: Address family not supported by protocol`

I've disabled IPv6 on a set of Docker nodes following the instructions from Disabling IPv6 in Ubuntu Server 18.04. However, netfilter-persistent is still complaining about IPv6: root@docker10:~# ...
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4 votes
1 answer
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20.04: Why does sysctl.conf fail to disable ipv6 on the main interface?

I am aware of the grub kernel params method but I'd like to understand why the sysctl approach is not working. On a 20.04 server if I add net.ipv6.conf.(all|default|lo).disable_ipv6=1 (presumably &...
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Ubuntu 20.10 cannot disable IPv6 via sysctl

The title says it all. I have been going over and over this for a few hours now, to no avail. root@blueberry:~# cat /etc/sysctl.d/no-ipv6-please.conf net.ipv6.conf.all.autoconf = 0 net.ipv6.conf.all....
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