Questions tagged [ipv6]

Internet Protocol version 6 (IPv6) is the latest version of the Internet Protocol (IP), the communications protocol that provides an identification and location system for computers on networks and routes traffic across the Internet.

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How to use ncmli to set proto udp6 for openvpn

I am using kubuntu 20.04 LTS. Network connections are managed by NetworkManager. I am trying to set up a connection to an openvpn server that only has an IPV6 address. I think that "proto udp6&...
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VXLAN does not work when brought up initially

I am trying to get an overlay network working using VXLAN. It is all in all a fairly simple setup, but for whatever strange reason refuses to work correctly when brought up. I have two (well, half a ...
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Is there any way to enable IPv6 forwarding without enabling other assumptions, particularly IsRouter on ND packets?

I notice in the documentation that enabling IPv6 forwarding sets an "IsRouter" flag on the Neighbour Discovery packets sent by the host. In fact it's stated that when enabling forwarding &...
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Why does my sytem have muptiple addresses on interface wlo1?

I tried to init docker swarm Error response from daemon: could not choose an IP address to advertise since this system has multiple addresses on interface wlo1 Ok,I will advertis address. ip a ...
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Routing does not work

I have two interfaces wan0 and wg0. The routing table looks like this: ::1 dev lo proto kernel metric 256 pref medium 2a0c:xxx:yyy:zz00::/56 dev wg0 proto static metric 20 pref medium 2a0c:xxx::/32 ...
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RDNSS support on Debian 11

As far as I tried, RDDNS isn't supported natively on Debian 11. I manually installed rdnssd and IPv6 DNS appeared in resolv.conf. Is RDDNS natively supported on Debian 11 (this means that I would have ...
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Trouble to get a ipv6 address with dhclient/console lines

I have issues to get an ipv6 address when using the command dhclient -6 to connect my PC to gateway by wifi. I have those logs when I use dhclient -6 -v sudo dhclient -v -6 Internet Systems Consortium ...
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IPv6 forwarding doesn't work in a network namespace

I have 3 Linux VMs connected like this: / server1 \ | ens19 2001:1::2 | \ / | / \ | ens19 2001:1::1 | | ...
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No DNS resolving of ipv6 only server

I have a Server with a ipv6 address and created a DNS AAAA-Record for it via "Strato". If I try to access the site, it wont resolve the Name to an ipv6 adress. When I change the nameserver ...
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How to add IPv6 route with systemd-networkd and select source address from limited subnet

TL;DR In a systemd-networkd .network file, in the [Route] section, what do I put for the PreferredSource= option to make it select any available IP address as long as it's within a specific subnet ...
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Why cannot ping by using owping?

I am testing one-way ping to measure the delay of the network. In my case, I have a problem. The error shows as follows: owping: NTP: Status UNSYNC (clock offset issues likely) owping: NTP: STA_NANO ...
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Unable to ping DNS server from Guest OS using IPv6

I am able to ping DNS server(2001:4860:4860::8888) from my host machine(Windows) using IPv6, but I am unable to ping DNS server(2001:4860:4860::8888) from my virtual machine(Windows) using IPv6. The ...
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SSH connects to the wrong host (IPv6)

TL;DR: I have two hosts, opi and bpi. When I do ssh bpi, I get connected to opi. I have traced the problem down to ssh opi connecting by IPv4, but ssh bpi using (a wrong) IPv6 address. I see my ...
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How I can send ping to IPv4 address from IPv6

I have a CentOS server that only has IPv6 address. I want to send a ping to an IPv4 address with the ping Linux command. Is this possible? [root@test conf.d]# ip a 1: lo: <LOOPBACK,UP,LOWER_UP> ...
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"Connecting...", "Connection failed. Activation of network connection failed" How to find out what does it mean exactly? (ping works)

I've connected two PCs running Linux Mint 20.2 with NetworkManager with Ethernet cable. On enabling the interface PCs obtained ip6 addresses and I'm able to ping one from another. But I'm getting ...
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Debian, docker, macvlan and static IPv6

Problem I am trying to setup a local DNS server (pihole) inside a docker container on my debian 11 server in my home network with a static IPv6, such that I can point all lookups from my router to it. ...
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Debian apt and ipv6

I have an ipv6-only Server and want to update the system. But if I execute apt update I get the following message: Fehl:1 http://deb.debian.org/debian bullseye InRelease »deb.debian.org« konnte ...
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Why tcptrack shows speed in negative number for low speed IPv6 connections?

I frequently use tcptrack to track ongoing TCP connections on my server. One thing I have observed is that it shows negative speed for TCP/IPv6 connections with low bandwidth consumption for example a ...
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Does Linux keep a per-host MTU table?

I'm experimenting with an IPv6 route that involves a 6rd (6-over-4) router, and I notice that when I use a packet size that is small enough to fit in the segments of the route that run native IPv6 ...
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How to prevent external IPv6 adresses from pinging my Adress IP address

How to prevent Extern ipv6 adresses from pinging my Adress? I am able to ping the others but i want to prevent the others from pinging me. i have written the Following Script but it does not do the ...
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Strange behaviour when getting IP address via DHCP from wifi access point

I'm experiencing a strange behaviour with wifi connection on Lubuntu. Basically, Lubuntu is getting only an IPv6 address when connecting to certain access point, although it should be getting an IPv4 ...
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How does arp works in IPV6?

In my project, I have a scenario of replace node with IPv6 environment When I assign one IPv6 address to node1 lets say xyz IP. By some reason if node1 goes offline, I will need to bring all services ...
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DSLite AFTR Implementation on Ubuntu

I am setting up DSLite using RPi(B4) and Ubuntu(AFTR). I can able to create tunnels on both ends but can't able to see traffic through the tunnels. My setup looks like below I am running dibbler ...
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getting ipv6 stable-privacy address with systemd-networkd

I am trying to get stable-privacy address geneted on my box for the router advertisement prefix. If I just set the kernel parameters like below I do get a good stable privacy address. sysctl net.ipv6....
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How to use wget with IPV6

I received an IPv6 address using the following command (and output): $ dig +short +answer aaaa deb.debian.org debian.map.fastlydns.net. 2a04:4e42:65::644 Now, when I try to run the following command: ...
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How can you use a address from ipv6 subnet?

I have a VPS running Debian 10 and I have for example the following /64 subnet: 2001:db8:abcd:abcd::/64 How can I use a single IP from this subnet? For example if I want to use this single IPv6 for a ...
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IPv6: Server can't ping gateway (pfSense) but gets IP

I have three servers which should now also get IPv6 connectivity besides the IPv4. Servers: Pi4 (Raspberry Pi OS) Nextcloud (Debian 10; Nextcloud as snap) Mailserver (Debian 10; mailcow as docker, ...
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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 (I am using Pop! OS 20.04). Tried both Pop Desktop and KDE Plasma. The SSDM ...
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DHCP lease renewal fails on AWS lightsail server

Tuesday the 12th of September 2021 out of the blue a root server of mine running debian hosted in AWS Lightsail crashed. After a reboot it would run fine for approximately 20-60 minutes, after that it ...
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Specify which of my machine's IP4 or IP6 addresses is to be used for a curl request

My linux box has 3 IP4 addresses and a range of IP6 addresses. Supposing I wish to make a curl fetch, how to stipulate from which address the request emanates? Note: I'm actually using Python/PyCurl, ...
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Why does an IPv6 neighbour router status become STALE? How can I avoid it?

I have a VM on a host with bridged networking (hence, with its own MAC address). Both host and VM run CentOS. Their network is managed by simple /etc/sysconfig/network-scripts/ifcfg-enpXsY files. ...
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Packet redirection between two network device

To run a particular application on openwrt, I would need to get a bidirectional fifo (direct transmission of network packets) between a device tun0 (openvpn) and br-lan (Ethernet). In other words, the ...
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Can't ping to OpenBSD router's globally routable IPv6 addresses

My router's IP address layout is as follows, anonymized to protect my network's privacy: 11.22.33.44 IPv4 WAN address 192.168.42.1 IPv4 LAN ...
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I've "bound" an entire IPv6 /64 - now how do I get my kernel to respond to ARP to accept packets?

I'm on CentOS 8 stream. My IP is 2001:570:1:b86::12, and I ran this:- ip -6 route add local 2001:570:1:b86::/64 dev lo and built and ran one of these, and i can now connect (locally) to my server on ...
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Netplan: give IPv6 priority over IPv4

On a dual-stack workstation (single interface, Ubuntu 18.04), I'd like IPv6 to be chosen first, before IPv4. I guess that means essentially to have domains being resolved first by DNS6, and then by ...
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OpenVPN setup with IPv6

I'm trying to setup openVPN server, but the connection from client doesn't reach tunel interface it's stuck at assigning IP address. From my ISP I get a static IPv6 address (2a03:ffff:ffff:ffff::/64) ...
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How to set preferred IPv6 interface

I have a program that sends multicast traffic via IPv6. It sends traffic out of the default network interface. It works fine normally (traffic goes out eth0) however if I have Docker loaded, then it ...
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Getting IPv4/IPv6 dual stack servers to bind to 0.0.0.0 instead of :: on machines where ipv6 is disabled?

I have a Linux (Ubuntu Groovy) server that is booted with kernel option ipv6.disable=1 so IPv6 is not available. I also have some dual stack software that advertises it works with IPv4 only machines ...
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systemd-networkd: Static address not added during boot

I have a .network file for my eth0 device: [Match] Name=eth0 [Network] DHCP=yes [Address] Address=XXXX:XXXX:XXXX:XXXX::617/64 When I boot the system, the interface gets an IPv4 and IPv6 address ...
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IPv6 Prefix Delegation for use on a single device

I want to setup IPv6 prefix delegation on a machine with only a single ethernet port and then request a set number of addresses and route them on the same device only. From what I have read so far ...
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wpa_supplicant: disable IPv6

I don't have support for IPv6 on my system, and I am only using IPv4. My wpa_supplicant logs are flooded with following error messages: wpa_supplicant[3370]: nl80211: Failed to open /proc/sys/net/...
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getaddrinfo() return both ipv4 and ipv6 while local system has ipv4 only

I use getaddrinfo(3) to get list ip address from a domain which support both ipv4 and ipv6, but the local system support ipv4 only or both ipv4 & ipv6, As I expect, if system support both ipv4 &...
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5 votes
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sshd_config - "Match Address <IPv6>" not matching

TLDR In sshd_config(5), this config segment: Match Address fe80::/10 PasswordAuthentication yes ... is not matching link-local IPv6 addresses as expected. Why and how to fix? I am trying to ...
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How many ipv6 addresses do I have?

I have a vps with both ipv4 address and ipv6 address configured. The "ip a" command has the output like: ... inet yyy.yyy.yyy.yyy/24 brd yyy.yyy.yyy.255 scope global eth0 ...
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netcat producing EINVAL when sending to UDP IPv6 multicast

I'm using netcat on Fedora to test an IPv6 UDP multi-cast address. The command is echo hi | nc -6 -u ff02::777:777:777 7777 netcat responds, "Invalid argument." Running strace yields ...
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2 votes
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How to resolve IPv4 first on Alpine Linux?

It seems that when resolving hosts on Alpine Linux, the default behavior is to try IPv6 first and falling back to IPv4. But sometimes it takes a lot of time to resolve, and there are connections when ...
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Retrieve "managed" flag of router advertisement from build-in IPv6 SLAAC support

The linux kernel has support for IPv6 SLAAC (stateless address auto-configuration) and is able to process received router advertisement messages. BUT: As much as I can understand, the kernel is not ...
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Restart network on RHEL8/CentOs8 thru ssh using nmcli with testing that the operation has finished

Thru ssh I'm updating the network configuration and then I want to restart the network. systemctl restart NetworkManager doesn't work very well with ipv6 static changes. So I tried: nmcli connection ...
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How to configure a GUE receive tunnel in Linux for IPv6

I am trying to configure a GUE tunnel to receive IPv6 packets that contain GUE encapped IPv4 packets but I am having trouble de-encapsulating the packets. The IPv6 packets have a GUE encapsulated ...
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Connecting to PIA VPN using OpenVPN on Raspberry Pi 4 (Raspbian)

I used these directions to setup Private Internet Access (PIA) VPN for my Raspberry Pi 4. I'm running Raspbian, and using the Pi as a mini desktop computer attached to my TV. And I'd like to have a ...
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