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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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Cannot connect to host even though it is reachable

There are 4 machines in my network, connected via a consumer router with default config (also acting as DCHP server). All machines can ping all other machines with both IPv4 and IPv6, except one (let'...
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1answer
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IPV6: Ubiquiti Router, Ubuntu Client

I have a Ubiquiti router on which ipv6 appears to be working fine. The output of radvdump, along with various other relevant data, is below. My trouble is with ipv6 on an ubuntu 16.04 machine behind ...
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Accessing IPv6 Only Network from IPv4 Network?

My ISP has provided me IPv6 only internet connection. If I connect from my IPv6 PC to IPv4 Internet I have no issues, because the ISP does all the IPv6 to IPv4 conversion. However, at home, on this ...
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1answer
26 views

IPv6 prefix delegation

I'm a complete noob at IPv6, but have some practical experience of IPv4 (just because I had to deal with it). My home router is behind CGNAT so they don't offer public IPv4 addresses, but I'd asked ...
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1answer
45 views

Can I use the home computer as the website server for offering the website?

My thinking is, the IPv6 resources are great many. can I use my home PC as a server, then config the IPv6 address on it. and bind the domain to the IPv6. then I can provide my website to the public. ...
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14 views

Why might pfsense be removing the link-local ipv6 address for my wan interface?

I am a Comcast customer, using IPv6 through a pfSense hardware appliance (PCEngines APU, running version 2.4.3-RELEASE.) I have setup my IPv6 on pfSense to ask for prefix delegations, which ...
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1answer
56 views

OpenVPN clients have no connectivity over IPv6

(re-asked from here) I'm trying to add IPv6 tunnel support to a OpenVPN server (i.e. clients can access the IPv6 internet through VPN). The router that runs OpenVPN (Netgear WNDR4500v1 running ...
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1answer
21 views

Can NAT64 be accessable on the internet with an ipv6 address?

I try to grasp how NAT64 is working. NAT64 is only used for an ipv6 host which initiates the communication with an ipv4 host. I read that a client access the NAT64 with a prefix address 64:ff9b::/96, ...
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72 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 ...
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29 views

Windows Server Essentials 2012 resolving DNS to IPV6

I am having an issue when I ping the server by name it resolves into an IPV6 address. I have disabled IPv6 resolution in the DNS settings on the server, then reset the DNS service on the server and ...
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1answer
33 views

How to know primary and secondary DNS servers for IPv6?

In my router's WAN page, it says my Primary and Secondary DNS servers are 84.xx.xx.xx which belong to my ISP's DNS servers. However, my router is connected to IPv6 and lists my DNSv6 server as fe80::1 ...
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1answer
52 views

Multiple VLANs per NIC Failing on IPv6

I run a dual-stack (IPv4 and IPv6) home network, with a few VLANs to segregate IoT devices (VLAN 20) from normal users (VLAN 10) from network hardware (untagged VLAN). I'm currently hosting local DNS (...
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2answers
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What is hard coding in reference to ipv4 and ipv6?

I am trying to wrap my head around IPV6 networks. I have a static IPV4 from my isp and when I am building apps I use what I am assuming is a "hard coded" address. Like the below: //The * are replaced ...
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2answers
36 views

What mechanism does Windows use to register its address in DNS?

In this Microsoft white paper IPv6 for the Windows Administrator: How Name Resolution Works in a Dual IPv4/IPv6 Scenario it's shown that Windows will attempt to register it's addresses with a DNS ...
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46 views

HurricanElectric tunnel begin to work only after a traceroute is done

I give you a little description of the network Structure and what I would like to be done and why! Unfortunately my ISP (one of the top in Italy) provide the IPv6 but only for navigate out, if you try ...
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18 views

HomenetGroup completely gone [duplicate]

I'm running Windows 10 Professional, and my homenet group has never been there, and I can't locate any component of it. "services" doesn't show any service with the name of "Homenet..." that I could ...
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1answer
59 views

Access external Network from a computer in the network

My network architecture is like this: Now I want to be able ping PC1 and PC2 from Debian computer according to the architecture above. Which configuration in the routing table, Iptables or other ...
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18 views

Forward data from host to a simulated network node in guest

I want to forward some UDP or TCP packet from a program on my host OS to another program that is running on the guest OS. HOST OS: Debian 9 GUEST OS: Ubuntu 14.04 on Vmware player In fact there is a ...
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0answers
39 views

IPv6 firewall configuration

For the life of me I can't figure out how to configure a firewall to correctly use IPv6. First, let me explain my setup. I have created a small test environment in order to play around with IPv6 and ...
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0answers
58 views

Trouble with IPv6 under KVM host with bridge (Centos 7)

Trouble with IPv6 under KVM host with bridge on Centos 7 I have ip6tables that are cleanly flushed with: #> ip6tables -F ND should be allowed Then, if I do: #> ip -6 neigh 2a0d:2407:14::1 ...
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2answers
119 views

OpenWRT IPv6 Firewall Redirect Port

Does anyone how to redirect an incoming port to another port for an IPv6 address in OpenWRT? There is no NAT involved just an ordinary global IPv6 address. What I am trying to do is change the port ...
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1answer
29 views

How do i setup a vpn server on a vps with only a ipv6 address?

I have a VPS but it only has a dedicated IPv6 address, i want to setup a VPN on it for me to connect to. How can this be achieved ?
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1answer
43 views

Router for RA, Linux for DHCPv6

I have a Mikrotik router. It has a DHCPv6 server, but it only gives out PD with it, it doesn't give out stateful addresses. I'd like to configure a Raspberry Pi (Debian) box for just the missing piece....
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1answer
51 views

netstat -r output, internet vs internet6, different gateway formats

What's the difference between internet and internet6 routes? I'm assuming internet6 stands for IPv6? netstat -r Internet: Destination Gateway Flags Refs Use Netif ...
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1answer
108 views

Why can't I ssh to a local (single-label) hostname: “ssh: connect to host myserver port 22: Invalid argument”?

(I figured out this is related to nscd; please see the bottom of the question) I'm trying to connect to a headless server via my laptop; they share a wired link via a Linksys wireless router and TP-...
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2answers
114 views

How can I trace an IP address (ipv4 or ipv6) back to my home network?

I am trying to see if my Netflix account has been hacked. I can see the IP addresses that are streaming from the account. However, I'm not sure how to trace the IP address to see the source. I'm ...
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2answers
70 views

Force Windows to forget DNS server

My home network does not support IPv6. If I connect to one that does, and then go home, Windows keeps trying that DNS6 server until it times out. I've tried ipconfig /release6 but it doesn't work. ...
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1answer
64 views

Windows route selection and “route print -6” vs “netsh interface ipv6 show route”

So I'm using Windows 10 and I need to redirect some IPv6 multicast traffic to a specific interface (a USB-Ethernet adapter to be more specific). By default all multicast traffic is going to my WiFi ...
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0answers
117 views

Security cameras on IPV6

This is really a two part question. First the problem: HughesNet provides ONLY IPv6 access. They do NAT your local network and even provide an IPv4 address. But the IPv4 address is for looks only - ...
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1answer
487 views

How to SSH to IPv6 only VPS if my ISP only supports IPv4?

I have a server on Vultr ($2.50 plan) that only supports IPv6. But, my ISP right now only supports IPv4 and I can't SSH into that box to do work. How do I SSH into this server? What are the tools/...
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1answer
70 views

Is it possible to create an IPv6 subnet when my router have /64 prefix?

My ISP gives me a Zhone Router with an IPv6 address using /64 prefix. The wireless of the Zhone router sucks badly, so I bought a new router with IPv6 capabilities to amplify the range of wireless in ...
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0answers
68 views

Linux machine cannot ping6 or ping Windows machine

I am trying to communicate via IPv6 between a Windows 10 machine and a Redhat 7.5 Linux machine. I am testing my connection by trying to ping both machines from each other's terminal. I can ping both ...
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3answers
287 views

Can ping by hostname, can RDP by IP, but cannot RDP by hostname?

I'm trying to Remote Desktop to another Windows PC. Both computers are in the same WORKGROUP. I can ping the remote computer by its hostname, which responds with its IPv4 address. I could get that ...
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1answer
126 views

How to update DNS AAAA record when SLAAC clients appear

I have a routed /64 from my ISP and I am running radvd. My clients (Linux, Windows) are working well without any additional configuration when they get plugged into the router. They all assign ...
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0answers
34 views

Converting Multi-subnet SOHO to IPv6

I am migrating my multi-subnet ipv4 home network to ipv6. Unfortunately, I am with an Internet provider who supplies only one non-but-mostly-static GUA/64 address. With or without Internet, I want ...
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1answer
78 views

Separate MTU for IPv4 and IPv6 on Linux

Is it possible to define MTU on an interface with different values for IPv4 and IPv6 on a Linux machine? It seems that command ifconfig MTU defines the same MTU for both IPv4 and IPv6. Any help is ...
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60 views

Can I use only IPv6 inside my OpenVPN tunnel?

I have OpenVPN server. I wonder if I can provide only IPv6 addresses inside the tunnel, but no IPv4 addresses? I tried to use server-ipv6 without server directive, in this configuration: port 443 ...
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1answer
100 views

Implications of ipv6 on LAN security

I have the standard setup with computers behind a netgear router that has the "auto config" ipv6 option enabled. As I understand it, this means that it assigns local ipv6 addresses on LAN and when ...
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1answer
68 views

Instruct DNS resolver to query specific DNS server for DNS records

Is it possible to instruct the configured DNS resolver to query a specific DNS server for DNS records? The environment only allows DNS requests to a specific IPv4 (the DNS resolver) - other UDP/53 ...
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1answer
226 views

Any workarounds to access websites that don't support IPv6?

Lately I have trouble accessing twitch.tv on any of my browsers and devices. Google Chrome gave me DNS_PROBE_FINISHED_NXDOMAIN so I looked up on... Google and most articles told me to change my DNS. I ...
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0answers
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Why are OpenVPN clients getting IPv6 address non-randomly?

My OpenVPN IPv6 clients are getting assigned addresses sequentially from 1000. For example, client 1 gets: 2006:xxxx:xxxx:xxxx::1000 and client 2 gets 1001 and so on. Also, they keep getting the same ...
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1answer
36 views

NSLOOKUP consistently fails for specific nameservers when used within its prompt

My objective is to check that all my domain's name servers are working with the following sequence of commands within nslookup (responses omitted here): set type=soa example.com set type=a+aaaa ...
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1answer
404 views

Stateless IP being assigned instead of DHCP address

Here is the information: Host link IP: fe80::9eec:b32d:855c:5589 Server link IP: fe80::f03c:91ff:fe11:96c4 Host global IP: 2601:aaaa:bbbb:cccc:1854:46d6:c2f9:e727 (Ugh!) Server global IP: 2601:aaaa:...
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1answer
80 views

6in4 tunnel on Debian 9

I have a VPS that has a /64 IPv6 address block assigned to it. I'm trying to deploy a 6in4 tunnel from my pfSense router at home and be able to access IPv6 addresses through that tunnel. I'm ...
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Why ip6tables DROP policy misses packages?

I have ip6tables rules like this: root@admin:~# cat /etc/iptables/rules.v6 *filter :INPUT DROP [10954:4558559] :FORWARD DROP [0:0] :OUTPUT DROP [42631:2058968] COMMIT *nat :PREROUTING ACCEPT [10945:...
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2answers
163 views

How to select which IPv6 to send a request from when having an IPv6 range?

I'm new to IPv6 and I'm trying to figure out how to send request from a different IPv6 address. How do I do that? I have bought a test VPS which says they give /112 IPv6 range. First of all, what ...
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0answers
99 views

Windows 2012 IPv6 DNS

I've decided to host my own internal authoritative DNS server for a made-up private domain used internally at home. I did so, and all my statically assigned linux boxes are happy and using it without ...
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1answer
50 views

Is Linux caching RAs?

Due to a bug in OpenBSD rtadvd, my router sometimes sends RA with an incorrect prefix prefix 2001:41d0:fe4b:ecf1::/64 prefix 2001:41d0:fe4b:ec42::/64 prefix 2a01:e35:8aea:ac42::/64 But if I fix it ...
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64 views

Autoconfigure link-local IPv6 address on GRE tunnel in Linux

I don't see how to get Linux to automatically configure a link-local IPv6 address for a GRE tunnel endpoint, even though it seems to have that ability since 2011. Here is the transcript. The 10.10.10....
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1answer
102 views

Unable to completely block IPv6 traffic on my Ubuntu host

I have this configuration Ubuntu 18.04: sudo nano /etc/sysctl.d/99-sysctl.conf net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 net.ipv6.conf.lo.disable_ipv6 = 1 sudo sysctl -...