Questions tagged [ipv6]

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

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Remmina SSH to ipv6 host

I use Remmina 1.4.2 and want to connect via SSH to a host with ipv6 address. I can connect to this host using 'ssh fqhn.hostname' but this does not work in Remmina. Is there an option to tell Remmina ...
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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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Steam can't download games with IPV6 enabled on Ubuntu 20.04

On my computer, with Ubuntu 20.04, I need to disable IPV6 otherwise I can't download any game on Steam. Is there any way to fix this so I can download games on it with IPV6 enabled? Everything else ...
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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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router_solicitations value

I have a couple of VMs (VMware Fusion), one running Ubuntu MATE 18.04 and the other running Linux Mint, based on Ubuntu. I'm using the IPv6 stack on both, and our LAN gateway is sending router ...
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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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add Enabling IPv6 Source Address Validation support

i have no find about ipv6 rp_filter, so please add Enabling IPv6 Source Address Validation support. i tested in ubuntu 20.10 and kernel 5.10.10
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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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Assign ipv6 addresses across a firewall without NAT

I need some advice on how to configure my system so that it can assign some of the /64 bock of ipv6 addresses provided by our ISP to devices which are behind a netfilter (iptables) firewall. Our ISP ...
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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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Ubuntu IPv6 route not work on multiple interfaces

I'm using multiple router but only default interface has IPv6 connection. I can make multi interface work on IPv4 by command as this guide: https://lartc.org/howto/lartc.rpdb.html ip route add default ...
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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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How to configure Netplan in Ubuntu 20.04 to accept DNS server received from IPv6 RA

I have successfully configured router to advertise IPv6 prefix along with IPv6 address of DNS server. Windows based IPv6 clients accept those RAs and self configure IPv6 address with given prefix and ...
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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 does not work with my 4G modem

I'm using Verizon Usb551l 4g modem on Ubuntu 20.04.1LTS and it works great however when I try to switch IPv4 to IPv6 the Internet connection stops working. I'm not sure why it does not work on Ubuntu, ...
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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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Freeradius and Apache2 ipv6

I use Apache server to request the Radius authentication to users trying to access my "test" directory. Conf Apache file 000-default.conf : <VirtualHost *:80> ServerAdmin ...
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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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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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No internet access via IPv4, IPv6 works fine

I ran into some troubles with my Ubuntu 18.10 machine. I have changed my ISP a few days ago and more or less since then I cannot connect to IPv4 websites anymore, nor use any service requiring IPv4. ...
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ipv6 not working in Ubuntu 18.04.5

Ubuntu 18.04.5, gnome shell 3.28.4 Other devices on our home network successfully report an IPv6 address when I use them to check an IPv6 test web site. The Ubuntu desktop computer, which is connected ...
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how do i enable ipv6 on ubuntu 18.04 lts and nginx ipv6?

when i run ifconfig i get the following $ ifconfig ... ... ... eth0 Link encap:Ethernet HWaddr a6:16:08:e6:c5:15 inet addr:191.168.1.59 Bcast:192.168.1.255 Mask:255.255.255.0 ...
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IPv6 not working with ping or http

I have a machine that wont communicate over IPv6. To demonstrate, the example here makes use of both Ping/Ping6 and opening Websites(IPv4 and IPv6). Example: host google.com i get google.com has ...
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How can I set ipv6 autoconfig in Ubuntu 20.04 Server?

How can I set ipv6 autoconfig in Ubuntu 20.04 Server, using Network Manager as render. I want to create a script, that set different network configurations. I checked some material over the internet, ...
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Multiple IPv6 addresses, how to set primary/default address via netplan (Ubuntu 20.04 LTS)

Hello and thank you for reading Ubuntu 20.04 LTS with SLAAC and Static IPv6 address SLAAC mainly because easy use in this network. Static for servers, that are needed to contacted from the outside. ...
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UFW allows outgoing IPv6 even when default policy is to deny all outgoing

I want to set a policy to deny outgoing connections by default. DNS lookup should be allowed Specific IPs should be allowed for outgoing connections So I setup the following rules: sudo ufw default ...
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Multiple interfaces, each with their own IPv6 address

I have a simple machine that has multiple IPv6 addresses routed to it. If I put these addresses in the netplan ethernet.eth0.addresses section, I confirmed that I can reach the machine from each of ...
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How can I use scp from an ipv6 server to download from an ipv4 server?

I know the -6 option to download from an ipv6 server, the problem is that i'm on an ipv6 server , and try to download from an ipv4 server, how can I do it ? Here's the command that I use : scp -r ...
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Cannot find my IPv6

I have been having networking issues, now out of the blue my IPv6 does not appear, my router is set up for IPv6 and I have looked through the logs. I am running Ubuntu Server 20.04 ip address root@...
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Device under UFW not getting global ipv6 address

So i have a Jetson Nano which use ufw to configure the firewall. Initially, the ufw over ipv6 was disabled, the rules are default all accept which works under ip6tables. Since it is not safe to set it ...
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1answer
146 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....
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1answer
845 views

What is setting my IPv6 addr_gen_mode?

I have just implemented my own DynDNS Service that updated 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. ...
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Destination unreachable: Address unreachable upon ping of outside hosts

Im having trouble pinging google.com on ubuntu 20.04 david@Ptolemy:~$ ping google.com PING google.com(syd09s22-in-x0e.1e100.net (2404:6800:4006:80e::200e)) 56 data bytes From 2001:8003:7405:1200:faab:...
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Netplan-based network config ignores IPv6 router advertisements on Ubuntu 20.04

I have a server cluster where all servers have a second network card. These seconds cards are connected to an additional cluster-local switch. It's a 10GBit local interconnect. I connect these servers ...
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2answers
535 views

DNS server does not listen on IPv6 after a reboot

I have two newly created 20.04 instances on AWS (Amazon Web Services). One is of type t2, the other of type t3. These instances have both IPv4 and IPv6 configured. As you probably know, these ...
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Unable to perform DNS queries over IPv6 from laptop

I was trying to perform a DNS query over IPv6 from my laptop using dig, and it didn't work. Here are the details: ping6 google.com works fine dig -6 google.com times out due to being unable to reach ...
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1answer
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apt-get update on private IPv6 AWS EC2

I have an EC2 on a private subnet with an IPv6 egress-only gateway. The VPC, subnet and EC2 all have IPv6 support and the EC2 has an IPv6 IP address assigned. I can ping and run curl to pull down ...
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381 views

Nginx socket() failed (97: Address family not supported by protocol) and push stream failed

I use nginx with the rtmp module and I use push to send the rtmp stream to my stream server. I don't send the stream directly to the stream server because I first check if the stream key is the right ...
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how connect ipv6 to ipv4 easily without using vpn

how do you get ipv6 to access only ipv4 websites? without using VPN and others? I have ubuntu VPS and install socks ipv6, but after I check that not all websites have ipv6, I'm very constrained there, ...
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Ipv6 default route lost after a few minutes

I'm connecting to the internet via IPv6 over wifi using stock Ubuntu 20.04. After a few minutes, I'm seeing the deafault ipv6 route disappear (ipv4 is unaffected). I used rtmon -6 to attempt to debug ...
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1answer
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IPv6 EUI-64, how to activate privacy extension on Ubuntu Server 20.04

In my home network I have dual IPv4 + IPv6 stack. IPv4 runs DHCP whereas IPv6 depends on SLAAC. On my Ubuntu Server 20.04 the /etc/netplan/00-installer-config.yaml file looks like this: network: ...
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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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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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