Questions tagged [ipv6]

IPv6 is the successor to IPv4. Rather than 2^32 addresses (like IPv4), it has 2^128, which is 340,282,366,920,938,463,463,374,607,431,768,211,456 unique addresses (34 undecillion). IPv6 addressing is quite different to IPv4 and is not backwards compatible, but protocols that sit on top (HTTP, SSH, etc) remain unchanged.

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IPv6 network fails on Linux router

IPv6 fails on ARMBIAN router I have a armbian box (RK3328 board + 1GB DDR3 + 8GB eMMC). The box has only one NIC, and acts as a linux one-armed router. IPv4 network works normally, but IPv6 fails. I ...
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In small network, how to provide ipv6 addresses in existing ipv4 subnet?

I have an ip4 192.168.0.0 subnet, with a few dozen hosts, and 6 or so servers with static IPs. I use bind 9 (On Centos 7) internally to service ip4 DNS requests. For years, I've disabled ip6, because ...
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Linux not responding to neighbor solicitation

I'm configuring linux router. It has one network interface with 2 VLANS: 7: enp1s0.100@enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 state UP qlen 1000 inet6 xxxx:xxxx:xxxx:xx01:202:...
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Squid IPV4:PORT to IPv6 HTTP PROXY SERVER

Hello friends I'm new to the forum. My purpose is to create ipv6 http proxy server. I couldn't do it when I tried to do it with Squid. Ipv4: will be port ----> Ipv6. After setting the squid.conf file, ...
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When the results stored based on ipv6 flow label be used?

I have gathered some information on IPv6 flow label. It is used to identify a specific flow from one source to one destination and from the first new flow labelled packet received, the ipv6 header, ...
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Shold I assign static IPv6 address to Windows servers?

I am working on deploying IPv6 on our WAN/LAN, I am going to have a /56 to assign. I will be subnetting it to 3 /64 subnets to start. My question now is on the LAN side, do I manually assign IPv6 ...
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Manually subnet an IPv6 Prefix Across Multiple MikroTik Routers w/out Prefix Delegation

I want to configure my network so hosts can IPV6 auto-address Global Unicast Addresses ("GUA") using SLAAC. I have a ::/48 (assigned by Hurricane Electric) that I want to divide into subnets and ...
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How to get an IPv6 subnet to use in Docker?

I have an IPv6 IP on the guest server which running docker 301b:e0d0:401:0348:lk19:7:0:2 Configuration in the /etc/resolv.conf domain my.domain nameserver ::1 nameserver 301b:e0d0:401:0348:505:7:0:...
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How to create IPv6 network connection in Docker?

Note: The IPv6 here isn't the real IP. Create a network docker network create -d bridge --ipv6 --subnet=123c:d0f0:202:1920::/64 awx Installed AWX with costomized docker-compose.yaml file version: '...
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How to enable IPv6 in Docker?

I am using docker on an IPv6 only host. I did it as document /etc/docker/daemon.json { "ipv6": true, "fixed-cidr-v6": "xxxx:xxxx:xxxx:xxxx::/64" } Restart docker. Create a new network docker ...
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How to set IPv6 network for connecting to remote host inside local docker container?

Note: The IPv6 address in this question isn't the real IP. There are two servers node1(IPv6: 123a:a4b5:0102:t234:cd90:3:0:2) node2(IPv6: 123a:a4b5:0102:t234:cd91:3:0:2) On the node1, installed AWX ...
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Nameservers are not resolving to IP for a domain

I am running CentOS7 with CWP on Digital Ocean droplet. The server is currently hosting two domains, and I added third domain on 26th April. I did it with normal steps, like: point domain to my ...
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Adding a public IPv6 address to a Linux VM in Azure

I have a Centos7 VM instance running in Azure. It has a public IPv4 address reachable from the internet. I would like to add a public IPv6 address to this instance's network interface but I cannot ...
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In /etc/hosts file why would IPv4 hosts be different from IPv6 hosts?

Background: CentOS 8, Digital Ocean droplet. Question 1) I just looked at my hosts file in /etc/hosts and I noticed that hostnames listed under IPv4 and IPv6 are different. IPv4 lists example, ...
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Setting up nftables for dual stack (ICMP, http, https)

I'm having a little trouble setting up nftables on a dual stack server. My setup is debian 9.11 with nftables installed (obviously). The IPv4 part is working as expected but IPv6 is not. Output of ...
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ip6tables block thunderbird email

The following ip6tables block thunderbird from retrieving email from my gmail account: sudo ip6tables -P FORWARD DROP sudo ip6tables -P INPUT DROP sudo ip6tables -P OUTPUT DROP sudo ip6tables -A ...
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Windows 10 (pro) IPV6 impossible to ping outside my local area network such as google dns for exemple

Windows 10 (pro) IPV6 impossible to ping outside my local area network such as google dns for exemple I can with success ping -6 all my local network equipment 2a01:xxxx:xxxx:xx00::21 (my voip ...
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Virtualizor Hetzner IPV6 subnets

I am trying to configure a Virtualizor instance on a Hetzner machine but I can't make it to work since I need to "nat" the IPV6 subnets. I divided my /64 subnet by multiple /80 subnets and I added a ...
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Windows IPV6 - Cannot Ping Outside Local Network

I'm setting up and testing IPv6 on our network and have run into a snag with our windows clients.. I've got a Cisco Catalyst 3850 switch setup for ipv6 unicast-routing and have two networks setup ...
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Routing Internet Traffic through VPN tunnel

I am relatively new to the topic, so please do not mind if I ask simple (or stupid) questions. I own a Raspberry Pi 3B and installed and configured an OpenVPN server on it. Therefore I followed this ...
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Would there be less load on a NAT firewall if some or all of the traffic were routed over IPV6 Instead of IPV4?

Just curious.. I was thinking that, on a NAT firewall that is normally overloaded, offloading some or all of the IPV4 traffic to IPV6 might make a performance difference?
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IPv4 To IPv6 Migration Advice

I'm currently working on adding IPv6 capabilities to our network, and I have some questions on what is considered best practice in 2020 to convert some of the IPv4 concepts we are used to into the ...
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if all of the world used IPV6, there is no need to have mac address anymore?

Mac address can not replace IP address, because Mac address is immutable, and there is no Prefix concept in Mac address. So why IpV6 can not replace Mac address? Do we still need Mac address when all ...
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Is there an ipv6 equivalent for net.ipv4.conf.all.route_localnet

Is there an ipv6 equivalent for net.ipv4.conf.all.route_localnet ? (According to nftables ip6 route to localhost/ ipv6 nat to loopback, there isn't). If not, how the use case described in Port ...
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Debian 9 does not find AAAA record for IPv6-only DNS names

I have an AAAA-only DNS name: superdns.cyberfusion.cloud. Using nslookup without options on Debian 9, I get No answer. Using nslookup without options on Ubuntu, I get the correct answer (AAAA record). ...
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CARP + IPV6 failover

I am using a vSwitch from Hetzner with an IPv6 network, I have configured CARP and works as expected, but the problem that I have noticed is that either because my IPv6 configuration or the vSwitch, ...
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Using IPv6 Addresses only

Technically, is it possible to configure a Google Compute or AWS instance with only an IPv6 external IP address? I am using the instance as a web server. Given today's situation, what percentage of ...
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DNS: mx record with only AAAA, no A record

My mx record for example.com points to mail.example.com I have only set an AAAA record for mail.example.com, but no A record. I don't want to expose my IPv4, only the IPv6. I can receive e-mail from ...
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How to check IPv6 address via command line?

How do I check the IPv6 address via command line? For IPv4 I simply use: curl ipinfo.io/ip This doesn't work for IPv6.
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Is it possible to deploy NAT64 gateway on shared IP vServer?

Is it possible to setup a NAT64 gateway (e.g. Jool, WrapSix) on a vServer which has a shared IPv4 address (192.100.100.100:20000-20020)* and normal IPv6 address? *The vServer's IPv4 address consists ...
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CentOs Network Unreachable

I have got fresh installation of CentOS 7 on my VPS (done automatically via my provider panel), but I have got problem with internet connection. For some commands, for example: ping 8.8.8.8 I get: ...
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Cannot ping own interface over ipv6

I have a raspberry pi with two network interfaces; one connected to a traditional managed-mode AP (wlan0), and one that hosts an ad-hoc (IBSS) network (wlan1). Recently, I started from scratch from a ...
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How to add ipv4 capability to ipv6-only-vserver?

I have an ipv6-only-vserver and a dual stack (ipv4-ipv6) server. How do I "add" ipv4 capability to the ipv6-only-server? So it's possible to "use" it like a ipv4 server: ssh/scp into the vserver via ...
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KVM VMs automatically being assigned an IPv6 - centos

Currently I have KVM VM's on my node and I have ipv6 enabled. I want to assign ipv6's manually to the VMs however I am finding when I boot the VM up it seems to be getting an IPv6 assigned to it ...
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Disable IPv6 on all tunnel interface

Microsoft recommends to disable ipv6 on all tunnel interface. To implement this settings i have to set value 1 or less in registry under this path HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\...
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Kubernetes kube-proxy NodePort with IPv6

I am trying to expose a service using NodePort on a on premise bare metal kubernetes (1.17) cluster (calico for CNI and CRI-O 1.17) All nodes (Ubuntu 18.04) have IPv4 and IPv6 adresses and are ...
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Istio & K8S - Ingress with IPv6 and IPv4

We are currently evaluating a K8S (version 1.17 using CRI-0 version 1.17 & Calico CNI) installation using Istio 1.5.0. All nodes have a valid and reachable IPv4 and IPv6 (ubuntu server 18.04 - on ...
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Multiple containers with multiple outbound IPs

Scenario: Server with multiple docker containers running inside, that can be configured to perform requests with different outbound ip addresses. Is this even possible? I have some knowledge gaps ...
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firewalld on KVM/QEMU virsh host blocking bridged guest IPv6

I am having some issues with my new IPv6 network involving my virsh KVM/QEMU guests. I could ping my gateway, and the rest of the internet. I could not however connect with TCP or UDP to anything even ...
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IPv6 radvd advise static IP as gateway?

I am running radvd (2.17-2, Debian Buster) on a local network to provide IPv6 access. I would like to make radvd advertise the static IP of the interface (e.g. 2001::1/64) as the gateway IP instead of ...
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Dual Stack issues with Active Directory

I'm trying to set up a dual-stack environment with two Windows Server 2019 domain controllers. However, when I test the client as IPv6-only, the client fails to authenticate with the AD servers. The ...
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How to quickly see all sockets listening for IPv4?

I recently learned that IPv6 sockets can also listen on IPv4 ports if /proc/sys/net/ipv6/bindv6only is enabled. So far I have been using netstat and ss to check what sockets are listening. Since I am ...
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Relevance of IPv6 in smaller shops, going forward?

IPv6 has been touted as the next up-and-comming network technology (for some 25 years now...), but it's penetration has been very slow. What do you see in your environment? Is it used internally at ...
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Unsupported address method 'v4tunnel'

I'm trying to create a tunnel to HE.net to get an IPv6 address on my (cloud) server. When I created the tunnel and put this in /etc/network/interfaces: auto he-ipv6 iface he-ipv6 inet6 v4tunnel ...
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Difference between icmp and icmpv6 for ip6tables?

I found the following lines in a firewall script on one of our Linux servers (kernel 5.x) ip6tables -A INPUT -p icmp -j ACCEPT ip6tables -A INPUT -p ipv6-icmp -j ACCEPT The two commands both run ...
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How to enable in `dhcpcd` temporary addresses

How to enable in dhcpcd.conf temporary addresses which changes random address every one hour beside changeless slaac private. I trying to add ia_ta 2 but it show error: IA with IAID must belong in an ...
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Ipv6 Proxies run on localhost but not on Google Cloud VPS

I'm trying to pull user data from instagram public api with PHP Curl. I am using IPV6 proxy on my curl connection. I get different results in localhost and google cloud using the same codes. When I ...
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Why IPv6 addresses are not represented as dotted-decimal like IPv4 [closed]

Maybe this is not a right place for this question, but I didn't find anything better for it. The text representation of IPv6 addresses defined in RFC 2373 states that the addresses should be ...
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CouchDB bind to both IPv4 and IPv6

I have a CouchDB instance (v2.3.1) hosted on a Ubuntu 18.04 server (Digital Ocean droplet). I would like to make it accessible from both IPv4 and IPv6 networks. I changed the /etc/couchdb/local.ini ...
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IPv6 connectivity suddenly disappears

In the environment specified below IPv4 purrs like a cat, but IPv6 vanishes after a short time – i.e. even the host can't reach its container via IPv6 over the Docker network. Did I miss something? ...

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