Questions tagged [ipv6]

Questions about IPv6, the newest version of the Internet Protocol. This tag should be used when asking about personal/home network IPv6 addressing, or basic IPv6 knowledge. Questions related to company-grade IPv6 networks are off-topic and should be asked on Network engineering SE.

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3 votes
2 answers
15k views

Is it possible to host my website with just an IPv6 without an IPv4?

Basically, here's my situation: I have an old laptop and want to use it to host a website on my home broadband, but my ISP only allows one static IPv4 address on the home connection. I don't want to ...
27 votes
3 answers
112k views

How to disable IPv6 on Debian Wheezy?

I know there's a wiki entry http://wiki.debian.org/DebianIPv6#How_to_turn_off_IPv6 that shows how to disable IPv6 in Debian Squeeze, but that's a 2.6.* kernel. What about 3.2.* kernels running ...
0 votes
1 answer
133 views

Can I proxy mumble traffic from IPv4 to IPv6 with socat?

I have an IPv6-only Mumble server at home (because I have no public IPv4). I want to make it accessible to IPv4-only users with a small VPN. The VPN has a public IPv4 that I can ping The VPN has IPv6 ...
1 vote
2 answers
1k views

Disabling IPv6 connectivity only for specific Wi-Fi network (Windows 10)

Today, I've successfully set up a home VPN router with OpenWrt and OpenVPN. Since my VPN provider only supports IPv4 connections, I don't want network traffic to leak out and I've disabled IPv6 by ...
0 votes
1 answer
2k views

Windows 11 connects to separate untagged and vlan tagged network at the same time - how do I make it stop?

I have a Windows 11 Pro machine 22H2 plugged into a network port that provides untagged network access, and a tagged VLAN for phones advertised using lldp-med. My expectation is that Windows, in ...
34 votes
7 answers
99k views

How to disable autoconfiguration on IPv6 in Linux?

How can I permanently disable autoconfiguration of IPv6 in Linux? When I try to manually delete an address from an interface with: ip -6 addr del 2001:0db8:85a3:0000:0000:8a2e:0370:7334/64 dev eth1 ...
0 votes
1 answer
337 views

IPv6 Wireguard ULA Routing

I would like to route traffic between two devices when they're both on NAT connections. They are both connected to a wireguard VPN on a VPS, but they cannot ping each other. On their wireguard ...
0 votes
1 answer
142 views

ISP switched me to Dual-Stack Lite, can't reach my network remotely with IPv6. Used to work with IPv4

I have a Raspberry Pi I use for TeamSpeak, I could simply connect to it. My ISP gifted me with Dual-Stack Lite taking away the IPv4 address I had. Is there a way for me to simply connect again to my ...
1 vote
0 answers
71 views

Quaggga OSPFv3 won't configure routes

I'm trying to configure Quagga to use OSPFv3 to create proper IPv6 routes between two OpenWrt routers running OpenVPN (tun mode). I know the tunnel is working properly because it works if I configure ...
0 votes
1 answer
176 views

Is the following IPv6 address valid?

i'am asking for a friend. Really :-) Given the exam question: Is the following IPv6 address valid? 2001:0DDB8:0:0:8:800:200C:417A RFC4291: Text Representation of Addresses I say no since the second ...
16 votes
3 answers
80k views

Disable IPv6 with OpenWRT

When I use stock Linksys firmware on my router, my networked devices properly use IPv4 only to access the Internet. When I use OpenWRT 15.05.1, the devices try to connect to various sites using IPv6 ...
0 votes
0 answers
420 views

How can I use the WAN interface IP address(es) in NFTables config?

Background I'm attempting to write an NFTables configuration that would allow me to keep IPv4 and IPv6 forwarding rules in the same table. I'm hosting some web services behind a reverse proxy and want ...
1 vote
0 answers
26 views

ping6 echo requests from container get lost partially

Thanks to kasperd's response on "ipv6 ping host got destination host unreachable until run tcpdump" I learned about tcpdump putting the listened on interface into promiscous mode. When ...
182 votes
3 answers
148k views

Why is there a percent sign '%' in the IPv6 address?

I am using the .NET Framework classes to get the IP addresses for my machine: Dns.GetHostAddresses(Dns.GetHostName()) I have a VirtualBox adapter which has both an IPv4 and IPv6 address. Using the ....
0 votes
1 answer
354 views

No internet IPv6 connectivity in lan or wireless on windows 11

Me PC recently crashed afterwards my onboard Bluetooth completely vanished Windows couldn't find any trace of it even tho the WiFi on the same card was fine ended up spending hours deleting and ...
0 votes
1 answer
256 views

Configuring IPv4 interaction on an IPv6-only server

I have an IPv6-only virtual server. I can connect to it via SSH or use ping6, but I can't work with IPv4. For example, get a file via wget (Network is unreachable). I have software that cannot be ...
0 votes
1 answer
379 views

Internet not working on ubuntu

I have seen the other similar issues but none of the posted solutions are working for me. I recently upgraded a bunch of packages. I am dual booting ubuntu and windows. IPv6 works. IPv4 gets an IP ...
17 votes
5 answers
8k views

Are IPv4 ports separated from IPv6 ports?

Is it possible for a host to have different open ports for IPv4 and IPv6 stack? For example, is it feasible to have the port 22 open only for IPv6 and not for IPv4 and vice versa? Also when I tried to ...
4 votes
1 answer
667 views

ssh to fqdn with private aaaa record returns "Undefined error: 0" on ipv4 only internet

I've set up an yggdrasil network (which is ipv6 only) and things work as expected, i.e. I can ping6 200::1:2:3:4 and ssh 200::1:2:3:4 from any network. I then added a few subdomains with aaaa records ...
0 votes
0 answers
88 views

Missing ports on macOS in ipv6

I would like to understand how it is possible to have a number of different ports between my local ip v4 and v6. I have a NodeJS service running on port 57110 but I can't see it on my IP v6. How is ...
1 vote
1 answer
351 views

Need clarification about ipv6 multicast and ipv4 broadcast

I’m studying IPv6 and I’m traying to better understand how it works in deep. So far, I know that there are essentially three types of addresses, based on the type of communication: unicast: one to ...
0 votes
1 answer
3k views

IPv6 fe80:: (link-local) addresses not being assigned to newly created network interfaces in Linux

When I try to add a bridge, it become in UP state without a fe80:: IPv6 address: $ ip link add br0 type bridge $ ip link set br0 up $ ip address show br0 40: br0: <NO-CARRIER,BROADCAST,MULTICAST,UP&...
1 vote
0 answers
771 views

Why did the Google DNS stop responding to my ping requests?

I’m sending regular pings to a few DNS servers to be alerted when networking issues occur. A few days ago, the Google DNS stopped responding to my pings on IPv6 (2001:4860:4860::8888, screenshot below)...
0 votes
1 answer
749 views

I disabled IPv6 in my smartphone but nslookup returns ipv6

I use my mobile data and hotspot to my laptop, so my laptop uses the same internet as my mobile. I recently disabled IPv4/IPv6 and only enabled IPv4 in my mobile data settings, but today is what ...
0 votes
1 answer
361 views

Installation of scoop times out

I want to install scoop on a laptop on which I do not have administrator rights. I use the following commands in PowerShell: PS> Set-ExecutionPolicy RemoteSigned -scope CurrentUser PS> iex (new-...
1 vote
1 answer
3k views

How to use netcat on Mac?

I start the app with sockets on Mac and returns following: kukodajanos@Kukodas-MacBook-Pro niots % swift run Building for debugging... [2/2] Emitting module niots Build complete! (0.30s) Server ...
1 vote
2 answers
3k views

IPv6 SSH Tunnel

I'm setting up a tunnel with ssh -w and I would like to route IPv6 traffic through it. The remote machine is a server on the Internet with several IPv6 addresses assigned What I am doing is: local# ...
0 votes
1 answer
335 views

How does a website detect my location over VPN with not IPv6/DNS/WebRTC leak?

a website like this https://findmylocation.org/ can detect my location when I explicitly allow my browser to detect my location. the goal is to even if I allow location in browser, the website shouldn'...
0 votes
1 answer
458 views

IPv6 network config on virtual box running two Srv2008R2 and Win 7

am trying to set up a test network on my windows 7 laptop to run in an IPv6 environment. basically i have downloaded virtualbox 4.3.12 latest version then created three virtual machines, two are ...
2 votes
1 answer
973 views

Windows 10 with IPv6 ULA and NAT thinks it's not connected to the IPv6 Internet

My little LAN is connected to two ISPs and I internally run ULAs so I can make explicit client-to-ISP assignments by centrally NATing my clients onto the respective ISP prefix. All Windows ...
0 votes
0 answers
451 views

Wireguard and zerotier not forwarding through CGNAT

I requested IPv6 networks from Route48.org and august.tw. Both offer wireguard tunnels and I connected to both at the same time with a 20 second keep alive. I also ran a test http server. connecting ...
0 votes
1 answer
2k views

Setting up multiple IPv6 routes over a single interface on Linux

tldr; A LAN device is able to get 2 separate internet connection (1 NATted from ISP Router, 1 from manual PPP connection). Able to separate ISP-WAN and PPP-WAN IPv4 into 2 routes using ip rules but ...
1 vote
1 answer
5k views

cannot access modem router configuration page when gateway shows a IPV6 address

I want to get to the configuration page tu turn on wifi. but 192.168.0.1 doesn't work. and default gateway shows a IPV6 address. Default Gateway . . . . . . . . . : fe80::201:5cff:fe9f:6c45%10 ...
0 votes
0 answers
814 views

Disable IPv6 using CMD or Powershell on Windows 7

I'm trying to disable IPv6 connectivity on Windows using either command line or WMI api without restarting the computer (I know about adding an entry into Windows registry, but this requires rebooting ...
2 votes
2 answers
8k views

Disable IPv6 connectivity on Windows without restarting the computer

I am trying to disable IPv6 connectivity on my computer without restarting it, I saw that some VPN applications delete routes from routing table in order to disable IPv6 connectivity, but when I try ...
1 vote
0 answers
183 views

How do you display timeouts when using ping6 on macOS?

When using ping6 (IPv6 version of ping), on macOS, I don't visually see the request timeouts when they occur. The ping responses just pause for each request that times out. A super observant eye will ...
1 vote
2 answers
32k views

Router is inaccessible, inexplicably giving IPv6 gateway

So I've been using this Router/Modem from my cable company for about a year now. I accidentally unplugged it earlier today, and now while I can access the Internet through a wired connection, my Wi-Fi ...
1 vote
2 answers
2k views

Does IPv6 have LAN IP addresses (like 192.168.1.5 in IPv4)?

I have read that with IPv6 every device will have its own unique IP address, does that mean in an IPv6 LAN there would be no IP addresses like 192.168.1.5 in IPv4?
1 vote
1 answer
735 views

Is IPv6 dead by now? [closed]

Ten years ago there was a lot of talk about IPv6. But just now I tried to disable IPv4 and to browse internet via IPv6. It turned out, I basically can access only Google and Wikipedia with IPv4 ...
0 votes
1 answer
1k views

Home server IPv6 dynamic DNS / failover setup (Starlink)

I have a Perforce server (Ubuntu 18.04) at home, and since Starlink finally showed up, I want to set it up so other people can synch with it over my sat uplink instead of my slow CenturyLink DSL. ...
0 votes
1 answer
921 views

IPv4 address in AAAA DNS record not working

Background (feel free to skip reading) I have a server running Wireguard, to which multiple Android devices connect using the Wireguard app. This server has 2 WAN connections - a faster line that has ...
0 votes
1 answer
155 views

IPv6 link-local multicast stops working after a reconnection

I have two microcontroller boards with the same Wifi module. One of the boards acts as an Access Point (AP) while the other acts as a Station (STA) trying to connect with the AP when it is in range. I ...
1 vote
2 answers
799 views

rsync fails on MacOS for IPV6 addresses with "ssh: Could not resolve hostname"

Copying files with rsync to a remote computer using the remotes IPv6 address fails on MacOS 10.14.6. It seems that the IPv6 address is not correctly forwarded to ssh, but all my attempts using ...
0 votes
1 answer
2k views

nftables: IPv6 NAT packets not going into forward chain but returned destination unreachable

I'm setting up NAT for IPv6 on an OpenWrt (22.03.0-rc4) router because my ISP only allocates one single IPv6 address via DHCPv6, and only allows one MAC address to use a single IPv6 address obtained ...
0 votes
1 answer
112 views

ip address output how to interpret it?

I'm on Fedora Silverblue 36 I'm with an Italian provider called "Fastweb" This is the output of ip address show $ ip address show 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue ...
0 votes
1 answer
5k views

IPv6-only WireGuard VPN without NAT

Goal I'm trying to set up a WireGuard VPN with IPv6 only through which I (a) want to route all traffic and (b) with a server that is accessible from the internet. Since I couldn't even get (a) to work,...
0 votes
0 answers
87 views

Internet (mostly) works but unable to ping - how to diagnose?

Found a couple similar questions (1, 2), but they don't exactly cover my issue and there are also no answers, so: Dusted off an older laptop with linux (NixOS 21.11.337659.06db2e21974 (Porcupine)), ...
5 votes
1 answer
5k views

What is the difference between IPv6 addresses :: and ::1?

Maybe this is a silly question but sometimes I see IPv6 :: to mean the local host, and sometimes I see ::1. Occasionally, using one vs. the other seems to be the difference between something working ...
0 votes
0 answers
157 views

Windows 10 VPN ipv6 subject

I installed a vpn client that enabled a vpn adapter. It works great, however IPv6 is not being routed, so when I go to sites that give my address is giving the origin and not the vpn server. So... at ...
1 vote
0 answers
2k views

Forwarding IPv4 to IPv6 in Linux

I am trying to forward IPv4 traffic to IPv6. I currently have two Ubuntu boxes, and I am trying to use socat and SSH dynamic port forwarding to accomplish IPv4 to IPv6 forwarding, but no luck so far. ...

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