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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Find if network supports IPv6

Is there a way to find out if the IPv6 network cable is disconnected from the server through the terminal? Pinging google won't work as it could be an intranet. Any help would be appreciated!
user2384330's user avatar
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Is there a way to allow responding to an IPv6 packet sent from a link local address to a regular IPv6 address?

We're currently configuring an Azure load balancer to work with a Linux-based backend supporting both IPv4 and IPv6. As part of the setup, the load balancer performs health checks at regular intervals ...
Brecht Vercruyce's user avatar
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VM/LXC asks AAAA record in a IPV6 disabled proxmox cluster

I have a Proxmox cluster with IPv6 disabled. Following setting made on /etc/sysctl.conf: net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv4.ip_forward = 1 When I do ...
Haseena's user avatar
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3 votes
1 answer
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Which is My Static IPv6 Interface Identifier?

I've been accustomed to IPv4 for so long and I'm really unfamiliar with IPv6. I recently wanted to add a firewall rule to my OpenWRT router to allow inbound IPv6 connection to a certain port of my ...
citrate's user avatar
  • 141
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1 answer
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Configuring IPv6 ULA addresses in OpenBSD via SLAAC

I would like to have devices on my network autoconfigure ULA addresses in a prefix generated by https://www.unique-local-ipv6.com/ on my network, which is predominantly IPv6-only. My main router is ...
neezer's user avatar
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1 answer
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Trying to conifugre bridge on GRE interface, facing issue

I have created an ipv6 tunnel by using the following commands: ip link add gre_test type ip6gre remote 2001:4860:4860::8888 local ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff ttl 255 removed actual ipv6 ...
vrax's user avatar
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0 votes
1 answer
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blank screen after ipv6.disable=1 removal from grub cmdline

I want to re-enable IPv6 on my system which is currently disabled in GRUB directly. But if I remove ipv6.disable=1, I then get a blank (backlit) screen. It took me tonight to figure out that I have a ...
Vlastimil Burián's user avatar
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Get global IPv6 address from PPPoE link

I'm paying extra to get an IPv4 address in my FTTH installation, which requires me to login via pppoe. rp-pppoe works fine and brings up the ppp0 interface with an IPv4 address and a link-local PtP ...
roughdog's user avatar
1 vote
1 answer
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How to enable IPv6 on subinterface in Linux using sysctl?

I tried the following: sysctl -w net.ipv6.conf.Ethernet1.200.disable_ipv6=0, but it gave following error: sysctl: cannot stat /proc/sys/net/ipv6/conf/Ethernet1/200/disable_ipv6: No such file or ...
gerrit_noob's user avatar
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CIFS mount share with IPv6 link-local address on Ubuntu

I'm trying to mount a Windows share on a headless Linux computer with the following systemd unit file: [Unit] Description=mount network drive from harvester OBC Requires=network-online.target ...
Joooeey's user avatar
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ifup overwrites resolv.conf incorrectly?

Debian 12.4 with networking managed by systemd networking.service, dual stack IPv4 and IPv6. I am aware of the many questions asking how to stop the system from updating resolv.conf, and this is not a ...
Ex Umbris's user avatar
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0 answers
91 views

How to set default metric on IPv6 route received by RA message

I have two ipv6 interfaces(eth1 and eth2), that receives an IP via DHCP(dhclient is used), but the routes are received via RA messages from switch, to which these interfaces are connected. Since RA ...
lucky_rydar's user avatar
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How to configure network interfaces prioritization via policy-routing?

I have two ipv6 only interfaces(eth1 and eth2) which are connected to switch. These interfaces get routes to main route table via RA(route advertisement) messages. The RA messages, sent by switch, has ...
lucky_rydar's user avatar
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Why can the lifetimes reported by ip address be slightly higher than the content of a received IPv6 Router Advertisement?

I'm currently investigating a strange network issue. Consider the following IPv6 Router Advertisement (note the prefix lifetimes, 5400 and 2700, respectively.): $ rdisc6 -1 wlan0 Soliciting ff02::2 (...
dialer's user avatar
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raise network interfaces - debian 12

I'm trying to add one main IP, two extra IP and one IP6. Here is my interfaces file located at /etc/network/interfaces: source /etc/network/interfaces.d/* auto lo iface lo inet loopback allow-hotplug ...
ramed rafie's user avatar
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How do I get all MAC addresses of all devices on my LAN that have an IP address (equivalent of doas nmap -sn but for IPv6)?

#!/usr/bin/bash echo "Give me your private IP and its mask";read given if [[ "$given" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}/{0,1}[0-9]{1,3} ]]; then echo "version 4" ...
John Smith's user avatar
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sshd: error: connect_to ff00::: unknown host

when I connect to server with ssh with SOCKS proxy tunnel, ie: ssh myserver -D2345 and then on the cleint start firefox and configure SOKS proxy to use my tunnel, then on the server, I get flood of ...
Martin Vegter's user avatar
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How does --network=host generate different HTTP requests then rootless networking?

I have two commands, one of them with # RESOLVES TO IPV6 podman run --network=host ... And one of them, # RESOLVES TO IPV4 podman run --network=slirp4netns ... Is there anyway to ensure both of ...
Evan Carroll's user avatar
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Why can't I scp a file to this host while I can ssh to it?

I configured sshd on my remote host with /etc/ssh/sshd_config.d/custom.conf: AddressFamily inet6 PermitRootLogin yes PubkeyAuthentication no Match Address fe80::d075:6982:4410:e071 This is a fresh ...
John Smith's user avatar
0 votes
0 answers
88 views

Linux kernel does not accept an ICMPv6 router advertisement but sends redirect to same address instead

I'm using dhcpcd to receive ICMPv6 router advertisements from my ISP on ppp0 and everything works after a fresh boot. However, some time later, upon a disconnect and ppp0 reconnection, this does not ...
MikeP's user avatar
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1 vote
1 answer
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IPv6 SLAAC configuration of bridged interface

My dual-stack network at home uses router advertisements for IPv6 configuration, with a (mostly fixed) delegated /56 prefix from my ISP. All my machines therefore have a predictable global IPv6 ...
philfr's user avatar
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Ubuntu accept_ra is not effective with sysctl and prevents dhcp6 when in netplan yaml

I have an Ubuntu 22.04.2 virtual machine. My intention is to only do dhcpv6 on an interface and ignore Router Advertisements so I don't get SLAAC v6 addresses and their routes. Currently, I ...
Bagels1b's user avatar
1 vote
0 answers
1k views

Debugging IPv6 connectivity in fresh Debian 12 installation

Context I installed Debian 12 in my machine a couple of days ago, and since then I have been facing some issues with (outbound) IPv6 networking. From my investigation so far (having gone through ...
cronos2's user avatar
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1 answer
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How do I make a Linux-based IPv6 access point?

To make a typical IPv4-based access point on Linux, one does these steps: Use hostapd to make e.g. wlan0 available for incoming connections; Choose some local subnet. For example, 192.168.99.0/24. ...
Vi.'s user avatar
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2 votes
1 answer
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nftables does not limit ipv6 traffic in rate limit rule in bridge and ip6 family

I have a wifi router where the wlan0 interface (radio interface) is bridged with the ethernet interface eth0 (connected to another server acting as DHCP) / # brctl show br0 bridge name bridge id ...
Haswell's user avatar
  • 141
0 votes
1 answer
149 views

Using an routed IPv6 prefix as dummy interfaces

I recently had to change dedicated server hosts from "ReliableSite" to "Psychz". When I asked for my ARIN IPv6 allocation to be announcd, Psychz has given it as a "routed"...
Neel Chauhan's user avatar
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1 answer
137 views

Get prefix length of IPv6 from dhcpcd

I use dhcpcd to acquire an IPv6 address. Is there a way to find out the prefix length of the acquired IPv6 through dhcpcd? Added this to the dhcpcd.conf to get an IP for eth0 interface eth0 ipv6rs ...
user2384330's user avatar
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0 answers
172 views

BIND IPv6 not responding to remote requests

I have setup an IPv4 BIND server that returns both IPv4 and IPv6 IPs but when I try and setup just an IPv6 server it does not work for remote requests. This is my named.conf options { listen-...
jms's user avatar
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1 vote
0 answers
101 views

How to specify which ipv6 address avahi service advertises

I configured a avahi service which I can see with avahi-browse. However I would like to specify which ipv6 address is used in that service advertisement. I would like it to use "2001:db8:1234:1:...
Frank Schrijver's user avatar
0 votes
1 answer
273 views

Unable to get IPV4 with dhcpcd on Alpine in a dual stack setup

After installing dhcpcd, the machine is unable to get IPv4 from DHCP, but generate IPv6 as expected and get DHCPv6 options (like DNS, domain, etc.); the config in /etc/networking/interfaces is auto lo ...
leoniDEV's user avatar
0 votes
1 answer
81 views

Discovered - all ipv6 ports are open

I am experimenting and exploring IPv6 possibilities. I turned on IPv6 on my Android phone (APN IPv4 / IPv6) and the desktop got an IPv6 address through the phone's hotspot DHCP server. The address is ...
Herman's user avatar
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0 votes
0 answers
186 views

PiHole running in docker cannot reply IPv6 connections from ULA address

After reading few guides on how to setup PiHole with docker and IPv6 I tried to do it in my network. First things first, my ISP provides me with a Prefix Delegation which is then used to provide ...
jtimz's user avatar
  • 101
0 votes
3 answers
93 views

Need assistance with awk/sed to identify/mark duplicate IP addresses

Good day. I have a text file which contains pod/node names and associated IPv6 addresses of which two pods have the same IP address, first pod k8-worker0001c-cif-9d86d6dd4-vf9b9 and last pod k8-...
Bjoern's user avatar
  • 31
0 votes
0 answers
53 views

Linux/Fedora Issue with NginX-Docker and maybe IPV6

I'm attempting to setup Nginx-Docker on Fedora 38 Plasma KDE (nearly fresh install). Nginx works fine connecting to my react-server (non-docker) running locally on port 3000. However, Nginx fails to ...
Psyfire's user avatar
0 votes
1 answer
1k views

Wireguard routing issues IPv4+IPv6

I'm trying to get a "simple" VPN working between two Linux boxes using Wireguard. Unfortunately, existing tutorials I've found weren't that helpful, because they usually A) only set up IPv4 ...
Florian Bach's user avatar
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0 answers
179 views

Prevent VNC from binding to IPv6 address

I have disabled IPv6 and I have found options to prevent MySQL, Postfix, CUPS and Telnet from binding to the IPv6 interface. However, I can't find a way to disable it for VNC. tcp6 0 0 :::...
supmethods's user avatar
0 votes
1 answer
6k views

Howto restrict IPv6 listening address in lighttpd on Debian

I try to make a lighttpd only available from localhost on a Debian system. The following lines are in /etc/lighttpd/lighttpd.conf server.port = 80 server.bind = "127.0.0.1" server.use-ipv6 = ...
Micha's user avatar
  • 177
2 votes
1 answer
231 views

virtual (?) IPv6 addresses

I (can) have a bunch of IPv6 addresses on a (virtualized) server in the internet from my hosting provider assigned in the network which is directly attached (from /64 where eth0 is configured). How I ...
Micha's user avatar
  • 177
1 vote
2 answers
219 views

IPv6 wide-dhcpv6-client fails at random intervals

At first, the system runs OK and successfully negotiates an IPv6 address and operates as intended. After some time the system stops sending DHCP requests and IPv6 fails after the lease times out, but ...
fileinsert's user avatar
4 votes
1 answer
1k views

IPv6 over PPPoE

I have a PPPoE link and some addresses. IPv4 addresses work fine. IPv6 not at all. I found out I had to add +ipv6 in ppp/options. If I ping ff02::1%ppp0 I only get replies from two fe80:: ...
Ale's user avatar
  • 187
1 vote
0 answers
254 views

DSM DDNS Custom Variables IPv6

I can't figure out the naming rule for IPv6 in the DSM DDNS settings. I want to set up a DDNS with my Strato account. The problem is that the Strato preset only allows IPv4 forwarding: But I need ...
Walter Lars Lee's user avatar
1 vote
1 answer
267 views

PowerDNS caching NXDOMAIN for AAAA records, but there is a valid A record

I have a strange problem with PowerDNS. The initial problem described to me was that one HTTP request could be made to domains under staging.corp, but anything after that would fail with a DNS error. ...
AlexH's user avatar
  • 23
1 vote
1 answer
390 views

nftables anonymous map for ipv6 dnat

When creating a dnat rule, you can specify the following command: nft 'add rule ip twilight prerouting ip daddr 1.2.3.0/24 dnat ip prefix to ip daddr map { 1.2.3.0/24 : 2.3.4.0/24 }' And then get ...
Oskar Stenberg's user avatar
1 vote
0 answers
315 views

Curl with random IP v6 from /64 subnet: ndppd, ip neighbour or routing not working

I'm trying to setup random IPv6 proxies pool on my server /64 subnet like this: https://github.com/zu1k/http-proxy-ipv6-pool, but curl --interface 2a05:541:108:26::2 google.com not working (endless ...
Questioner's user avatar
1 vote
0 answers
143 views

disable multicast and promiscuity is off, nic still receive multicast packet

[root@VM-0-13-centos ~]# ip link set dev eth0 multicast off [root@VM-0-13-centos ~]# [root@VM-0-13-centos ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group ...
Ccfeiker's user avatar
1 vote
0 answers
112 views

ip is loosing after reboot, ntpd log : Deleting interface #4 eth0, ipv6

After rebooting computer, IPv6 address is lost. [root@VM-1-47-centos ~]# ip addr 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 link/loopback 00:...
Ccfeiker's user avatar
2 votes
1 answer
517 views

ipv6 multicast fails when it should loop back to self

So far I use multicast with ipv4 and it works; all involved computers run linux. I listen on two machines and send on one of those two (in a separate terminal). In the below example 'Hello 1' is ...
Al_'s user avatar
  • 23
0 votes
1 answer
373 views

No IPv6 loopback address in Ubuntu container

I have an Ubuntu 22.04 VM running via VirtualBox on my MacBook. ip addr shows (among other things): 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000 ...
Daniel Walker's user avatar
1 vote
1 answer
241 views

ipv6 kernel module unloaded but my interface has a ipv6 adress

I try to disable ipv6 on my laptop on fedora 37 by modifying sysctl.conf files: I first tried to echo "net.ipv6.conf.all.disable_ipv6 = 1" | sudo tee -a /etc/sysctl.conf sudo sysctl -w net....
user avatar
1 vote
0 answers
421 views

Adding a working ipv6 nat to an existing ipv4 nat

I like to add ipv6 to an existing an working ipv4 nat. It is a proxmox host and the clients are vms. I tried to get it working by adding corresponding files on the nat device (proxmox host). The file /...
sneaky's user avatar
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