Questions tagged [ipv6]

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

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ddclient with ipv6 in ubuntu 16.04?

i am trying to revive my old Thinkpad T60 as an Home Server, firstly for nextcloud. I already use a dynamic dns service with portmapper for my raspberry pi, i simply used the usev6 = if, if=eth0 ...
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How to configure ipv6 with eui-64 interface id on ubuntu 18.04?

Refer to https://netplan.io/reference. There is a key "ipv6-address-generation" with possible values: eui64 or stable-privacy. However when I tried to add that key on /etc/netplan/50-cloud-init.yaml ...
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Ubuntu Server 20.04 - Netplan configuration for dynamic IPv4 and static IPv6

TL;DR Does anyone have a working netplan configuration that sets a dynamic IPv4 and a static IPv6 under Ubuntu Server 20.04? What works My provider (OVH) gave me a server with this configuration in ...
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How are my hosts sharing an IPv6 ULA and allocating IPv6 addresses

Im running a mixed network of Ubuntu (all 20.04) MacOS and Windows 10. I run Ubuntu server which runs dnsmasq and acts as the DHCP server for the network (the machine is called 'serv2' and has IP ...
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How to permantly disable snooping on bridge interface?

On Ubuntu 18.04, IPv6 networking might fail on bridge interface. Disabling snooping immediately solves the issue. Following Where to put configuration to turn off multicast snooping on bridges? and ...
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Disable IPV6 on Ubuntu 20.04 is broken

Settings - > Network - Wifi -> IPV6 -> DISABLE is not working how do I disable it? why is the network GUI broken?
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How do I make changes to the file /etc/gai.conf take effect without a reboot?

Per the title, how do I make changes to the file /etc/gai.conf take effect in Ubuntu 20.04 without a reboot? (I altered /etc/gai.conf to force prioritization of 4to6 (IPv4 to IPv6) tunnel traffic over ...
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IPv6 DNS resolve - Ubuntu 20.04

I've installed Ubuntu 20.04 and I'm not getting IPv6 to work. Can someone help me, please? $ resolvectl -6 query google.com google.com: 2a00:1450:4003:801::200e -- link: wlo1 -- ...
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IPv6 not working properly in Ubuntu 20.04

Few days ago, I upgraded to latest version of Ubuntu (20.04 LTS). After freshly installing a new system I discovered, that the computer could connect to IPv6 addresses only after a huge timeout. DNS ...
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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 ...
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Prefer AAAA (IPv6) DNS lookups before A (IPv4) lookups

I want AAAA requests first as required by https://tools.ietf.org/html/rfc8305#section-3 Both queries SHOULD be made as soon after each other as possible, with the AAAA query made first but I ...
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Configuring an ISP supplied IPv6 range under systemd in Ubuntu 18.04.4 LTS on a server

I have a server with OVH. It has some IPv4 addresses, and those work as expected. I would like to start supporting IPv6 as well. They supplied me with a base config that mapped a /32 IPv4 and a /64 ...
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Not able to assign ::1/128 to a different interface other than lo

When lo interface is created, it has 2 localhost addresses, 127.0.0.1/8 for IPV4 and ::1/128 for IPV6. I need to have the same localhost addresses on a different interface in a different VRF (...
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Sysctl IPv6 disable autoconfig for all interfaces not working

I am trying to turn off IPv6 autoconfig for my all interfaces (I have 4). I want to use net.ipv6.conf.all.autoconf = 0 In the my sysctl config (under /etc/sysct.d) But the settings not applied for ...
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IPV6 tunnel stops working randomly until I renew my public IP

I'm using Ubuntu Server 19.10 as a router. Whenever my ipv6 tunnel isn't able to ping ipv6 addresses, I have to do the following: dhclient -r wan dhclient -v wan However, before I renew my public ...
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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 ...
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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 ...
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Can't ping DNS ipv6 address from Windows 10 when connected to Ubuntu 18.04 installed as ipv6 router

I have an Ubuntu desktop 18.04 on a PC. I installed it as an ipv6 router. This router has two NICs. One NIC as a WAN interface enp4s0. The WAN's ipv6 address is 2001:b010:203f:ff01::0012 /64, and the ...
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IPv6 source address selection with addrlabel (or similar) with netplan (or similar)

I have using something similar to How to enforce IPv6 source address selection with addrlabel at startup? to configure IPv6 address selection in Ubuntu 16.04. Now I am deploying Ubuntu 18.04 and the ...
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How do I assign a /64 ipv6 subnet

So for my application I want to be able to use any ipv6 address for communication but right now I can't even let curl use the addresses so I'm stuck. Ubuntu 18.04.3 LTS netplan as network manager ...
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How can I change my Ubuntu's IPv6 DUID?

Some context: I dual boot my desktop between W10 and Ubuntu. (W10 for games, Ubuntu for work) I have a fully working IPv6 setup with pfSense as edge router. The DHCPv6 server is configured to ...
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Enable IPv6 on Ubuntu 18.04

I followed this tutorial (https://www.digitalocean.com/docs/networking/ipv6/how-to/enable/) to enable IPv6 on my existing Ubuntu 18.04.3 LTS Droplet on DigitalOcean. My server doesn’t have anything in ...
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Ubuntu as IPv6 router

Draw of network is here. How can I configure Ubuntu server (A) to generate dynamic IP for new end points (like B) but C server should have static IP? (Firewall: A and C server accessible via SSH only ...
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Ubuntu 18.04 LTS need to stop ipv6 router solicitation

I have 2 lab systems that have no connection to the outside world. We don't have an ipv6 infrastructure in our lab. We have no need for ipv6. The machines are connected to three networks, one is a ...
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Why is ping failing in ubuntu 19.10? (seems related to IPv6)

Trying ping dynazu.com gives: joel@laptop:~$ sudo ping dynazu.com PING dynazu.com(2600:3c01::f03c:92ff:fe3b:2efa) 56 data bytes and never completes... Ifconfig gives: joel@laptop:~$ ifconfig -a ...
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IPv6 address with cidr `/128`

Under Ubuntu 1604, connect a box to a socket on the wall (of the lab), the box get both IPv4 and IPv6 addresses. IPv4 works fine, but IPv6 does not . I noticed that the global IPv6 address has a CIDR ...
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605 views

Disable IPv4 on Ubuntu 16.04 LTS

I want to create a pure IPv6 environment or disable IPv4 completely, not just on the interface. If it is impossible, I want to disable IPv4 on boot via the command line or a configuration file.
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How to make an IPV6 only hotspot on Ubuntu 18.04?

I'm trying to create an IPV6 only network in Ubuntu. I used this solution to create the hotspot and that worked. In order to make it IPV6 only using nm-connection-editor, I disabled IPV4 and checked ...
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434 views

Cannot configure static IPv6 (Ubuntu 19.04)

I'm trying to implement a network for a project where i need a server, a virtual machine running Ubuntu 19.04, with two static ipv4 and ipv6 addresses (one on each interface on the machine) to connect ...
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IPv6 Forwarding not working

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 not ...
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ipv6 doesn't work until I restart radvd on the firewall

My laptop (Ubuntu 18.04.3 LTS) frequently doesn't get ipv6 routing information until I restart radvd on the linux firewaall. Then everything works fine. Any ideas as to how I can get this to work ...
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IPv6 ordered allocation & Dynamic Hosting

I have a complex situation here, to which I partly found a solution, but let's just say I want to view all the possible angles, so I am asking for your opinions, so this e-mail is a looooong e-mail, ...
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Ubuntu guest on Ubuntu IPv6 host IPv6 not responding in or out

Ubuntu MATE 19.04 on VirtualBox 6.06 using bridged adapter. IPv6 on host - yes. IPv4 on guest - yes. IPv6 on guest enabled - yes. Thanks to JayEye for prompting info below: Cannot ping IPv6 from ...
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How can I troubleshoot when an IPV6 tunnel stops working?

Assuming the configuration hasn't changed, how can I start troubleshooting? I woke up to not being able to ping IPv6 addresses. Things to keep in mind: IP Address didn't change. Public IP Address ...
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How to connect to ipv6?

My server is connected to a network which supports ipv6, however, it can't connect to any ipv6 address. Ping6 returns a message "network is unreachable." and curl ipv6 don't work as well. How to check ...
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Why has IPv6 mngtmpaddr stopped responding?

19.04 I have been using IPv6 on my LAN for a few weeks now. Ping, SSH, NFS -- all fine. Three 19.04 machines, all good. Yesterday, after an update, the IPv6 stopped working. Processing a request to ...
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Error with wifi connection and IPv6 [duplicate]

I am having this issue every time I connect to a network over wifi, the internet connection does not work, I have to go to wifi settings of the network and disable IPv6, and then restart my laptop for ...
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234 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 ...
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Is There a Global Switch to Use UFW for IPv6 Only?

I would like to use UFW for IPv6 only (I already have a perimeter firewall for IPv4). Aside from using a global allow rule for IPv4, does /etc/default/ufw understand IPv4=no as do not affect IPv4 ...
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Use Same DNS Server (IPv6) for All Connections

I want to oblige a single computer to only use specific DNS servers, for all network connections, including new ones, and be sure that only these DNS servers will be used. I've found a solution by @...
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Set static IPv6 and disable IPv6 Autoconf

I'm trying to replicate a DigitalOcean VM on my home network. They are using a static IP configured in /etc/netplan/50-cloud-init.yaml. It has stuff for IPv4, and v6 and works how I want it to. My ...
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ipv6 causes slow download speeds, but if disabled cannot use vpn Ubuntu 18.04

I cannot find any answers for this, so if anyone here can point me in the right direction... Edited for clarity Ubuntu 18.04 with low latency kernel. I get horrible download speeds at times, ...
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IPv6 default route NOT being set netplan Ubuntu 18.04.2 LTS

Am unable to configure the default route using netplan on an Ubuntu 18.04.2 system. The route works when explicit ip -6 route add ... commands are issued. Privacy extensions have been disabled: /etc/...
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ipv6 address of default LAN gateway

19.04 I'm setting up some IPV6 static addressing using netplan and want to put the ipv6 gateway. wifis: wlp3s0: dhcp4: no dhcp6: no addresses: [10.0.0.120/24,"fe00::120/64"] ...
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Ubuntu 18.04 boot time is too high

I have installed Ubuntu 18.04 as dual boot with windows 10 on my HP Pavilion 15 laptop (i7-8750h, 8GB RAM, Nvidia GTX 1050 4GB Graphics). I have windows 10 on a 128GB SSD and a 1TB HDD out of which I ...
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Disable IPv6 when connected to (specific) VPN network

In most of the places I work, IPv6 is supported. For my research work I also have VPN access to the university. However, this university does not support IPv6, so IPv4 data is routed over the VPN when ...
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How to enable smart MTU black hole detection/PLPMTUD feature for IPv6

In an article entitled "Path MTU discovery in practice", it provides a way to enable smart MTU black hole detection or Packetization Layer Path MTU Discovery feature on Linux by typing these commands: ...
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Ubuntu 18.04 using VPN have Ipv6 leak

I am using Ubuntu 18.04 with all the updates. I am also using a VPN that supports Ipv6. After setting up my VPN some time ago I kept getting stuff from Thailand where I live. I finally found doileak....
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How to disable IPv6 ping echo reply in Ubuntu 18.04

I want to disable IPv4/6 ping echo reply on my Ubuntu 18.04. For IPv4 I can do it with net.ipv4.icmp_echo_ignore_all=1 in /etc/sysctl.conf. What is the IPv6 equivalent? Here is my ip6tables -nvL: ...
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ipv6 on Protectli / Ubuntu firewall appliance LAN does not route to xfinity gateway

I'm setting up a new firewall/router on a Protectli appliance with 4 Gbit interfaces, running Ubuntu 18.04. Comcast (xfinity) is delegating /64 ipv6 to me, and setting up subnets on Linksys routers ...

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