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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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Why No Src Field found in IPv6 Route Table

As the below example, each entry in my ipv6 route table has no 'src' field in contrast to that in ipv4 route table. Does it has a reason? If I wan to manually add the 'src' field, what's the command ...
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1answer
24 views

systemd-resolvd seems to make up a non-existing AAAA entry?

One of my worker servers is experiencing problems connecting to a central server. This happened suddenly, it worked earlier, and it still works on an identical other worker. After some inspection the ...
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1answer
24 views

Permanently remove interface ipv6 address

I am running Ubuntu servers 16.04.5 LTS in virtual box. The servers are connected with an internal network to which want to assigne an IPv6 address range fd01:2345:6789:abcd::/64. The interface ...
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18 views

Assign IPv6 subnet to interface - outgoing requests

I received a IPv6 subnet /64 from my provider (vultr). Many people are asking how to assign whole subnet to interface. As far as I understand, the easiest option is ip addr add 2001:4860:4860:abcd::/...
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1answer
68 views

Gmail rejects messages from new exim4 setup

I have problem with delivering mails to GMail from a new server setup with configured exim4. Messages sometime passed to gmail spam folder. But sometimes it rejects immediatelly. I have attached a ...
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1answer
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Postfix: What is the meaning of the non-loopback IPv6 addresses in the default value of mynetworks configuration parameter?

On Postfix 3.1.0, postconf -d mynetworks prints: mynetworks = 127.0.0.0/8 192.168.1.0/24 [::1]/128 [fd6f:721b:f2ec::]/64 [fe80::]/64 What do the last two elements in the list, [fd6f:721b:f2ec::]/64 [...
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2answers
51 views

How do you define an IPv6 /64 block in Apache virtual host

I tried every combination but I keep getting error restarting Apache. Does anyone knows how to define a block inside apache virtualhost? <VirtualHost "[2601:9ab4:48af:97::/64]:80" _default_:*> &...
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1answer
31 views

NTP and NTPDATE over IPv6 Does Not Work

I have been working with setting up an NTP server for testing IPv6 syncing. I am unable to find any help with getting the configuration to work. If ntp 4.2.6 and ntpdate 4.2.6 say they support IPv6, ...
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28 views

How to allow allow ipv6 on nginx centos 7

I am not able to access my ipv6 like so http://[2605:3030:2020:1310:d838:efff:fe29:1964] for ipv4 I can do this firewall-cmd --permanent --zone=public --add-service=http firewall-cmd --permanent --...
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1answer
789 views

IPv6 Link-Local address contains the word 'bad'

Server 2016, this is our SCCM server. I'm attempting to troubleshoot an issue with our SCCM instance and I notice that the IPv6 Link-Local address contains the word 'bad' at the end. I can literally ...
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Will anything break if routed prefix is configured as link prefix on host?

I have ordered a host with a major hosting provider and found IPv6 configured in a slightly unusual way. The provider have allocated the prefix 2001:db8:469e:1ea1::/64 to my host. On the provider ...
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ipv6 route from one interface to another

I have a Linux virtual machine running in windows. The linux virtual machine has routing table Kernel IPv6 routing table Destination Next Hop Flag Met Ref Use If ...
2
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1answer
62 views

IPv6 on Linux tun/tap: NDP not working

I am working on an old code that used to connect different IPv6 devices over a different kind of network (a powe line netwrok, PLC, which is quite similar to 802.15.4). To do that, it created Linux ...
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56 views

IP address on GKE for egress is IPv6, not IPv4 wth Cloud NAT [closed]

I would like to set a fixed IP address on egress of an application with GKE. In a case of GCE, each external-IP of VM instances is exposed to an external application on connections as 'REMOTE_ADDR'. ...
2
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1answer
33 views

IPv6 routing with duplicated route entries

In my Linux system, it has three interfaces each of which got assigned an ipv6 address. The route table is: fe80::/64 dev enx000ec6ac911b proto kernel metric 256 pref medium fe80::/64 dev ...
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46 views

Send a negative response to any AAAA DNS lookups

Neither my local networking equipment neither my ISP support IPv6. While some applications support restriction of DNS lookups to IPv4 addresses some others don't so these applications end up waiting ...
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Toggling an interface causes static ipv6 address to be deleted whereas ipv4 address stays. How to make ipv6 address also stay? [duplicate]

I'm working with kernel 2.6.32. I have set a static ipv4 and ipv6 address on my machine. ifconfig eth1 eth1 Link encap:Ethernet HWaddr 00:50:56:AB:8D:A1 inet addr:10.5.175.254 Bcast:...
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2answers
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ipv6 does not work beyond /64

Using debian stretch and I think that my link provider send me a prefix /56 (at least it is what they told me). Using RA I can use ipv6, but using another ip within prefix I doesn't work. Let me ...
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38 views

How to set an IPv6 neighbour discovery proxy with Netplan?

How can I configure the following commands in Netplan? ip -6 neigh add proxy 2a03:4000:21b:44bc:1::1 dev ens3 ip -6 neigh add proxy 2a03:4000:21b:44bc:1::11 dev ens3 ip -6 neigh add proxy 2a03:4000:...
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1answer
30 views

OpenVPN leaks IPV6 in Ubuntu but not in android

First of all I would like to say that I am a complete beginner in this topic. I have been trying for several hours to allow my system to connect to my VPN (I have a raspberry pi with the basic ...
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Docker iptables and ufw

So this is a well known problem. tl;dr: https://github.com/chaifeng/ufw-docker What I noticed now: On a default ubuntu 18.04 with ufw and docker (no modifications), ufw rules on published ports has ...
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KVM Ubuntu Guest IPV6 DHCP does not work

I have a KVM server sitting on Debian server. Networking setup via macvtap/bridge device model rtl8139 I installed ubuntu server 18.10 w/o X. /etc/netplan/50-cloud-init.yaml network: version: 2 ...
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1answer
112 views

Docker 18.09 not talking IPv6 (on Ubuntu 18.04)

Brand new and fully patched Ubuntu 18.04 instance (on a Linode VPS) with Docker 18.09.0 (build 4d60db4) installed from the official Docker repo. IPv4 networking is running fine, both between ...
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1answer
56 views

ipv6addr_secondaries not properly working centos7

Hello I tried to configure additional ipv6 addresses on my centos 7 server but it seems different from centos 6. this used to work on my centos6 server BUT NOT ON my CENTOS 7 IPV6ADDR_SECONDARIES="...
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1answer
135 views

IPv6 - No route to host (113)

I'm trying to connect, in IPv6, two modules (client and server) via a router. It works in IPv4 but not in IPv6. Here is router configuration: $ ifconfig eno1: flags=4163<UP,BROADCAST,RUNNING,...
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1answer
129 views

Ping public ipv6 dns from docker container

The docker container is running on a VPS (ubuntu 18.10). What I am able to do: ping -6 2001:4860:4860::8888 from host machine ping -6 <docker container ipv6 address from host machine ping -6 &...
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141 views

Squid IPv6 To IPV4 mapping

i just finished setting up my squid proxy server, i have lots of IPv6 and only two IPv4 on my interface. the way squid is working currently is to use specified IPv6 tcp_outgoing_address, but if ...
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1answer
61 views

Unable to ssh server via ipv6

First: ipv4 works fine. So I got the following setup: (Server is an Arch Linux OS running as VM) EDIT Added a rule ACCEPT tcp ::/0 ::/0 tcp dpt:22 which ...
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0answers
11 views

IPv6 SLAAC support for servers OoB adapters

What is the status of SLAAC support for IBM Integrated Management Module, Dell iDRAC, HP iLO, etc? Or if this is not supported, then is one able to configure IPv6 address manually?
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1answer
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What IPv6 block should be whitelisted when a user asks to whitelist their IP?

Currently, on my IPv4-only service, users can whitelist their IP address which allows them to bypass email 2-factor authentication when they log in. When they do this we only whitelist that single IP ...
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1answer
56 views

Assigning ipv6 addresses for multiple ipv6 only proxies

I'm a bit new to IPV6, so please correct me if I have some horrible misunderstanding somewhere. I have a situation where I want to run multiple ipv6 only proxies on Linux (Ubuntu 18.04 and proxies ...
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0answers
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Show delegated ipv6 prefix at command line

I have openwrt/lede running on my routers. With the gui called ”luci“ installed in the overview the delegated ipv6 prefix is displayed. How can I figure out the delegated prefix at the command line?
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Multiple routes from router advertisements

Consider the following simplified setup: All devices are IPv6 enabled. Interfaces are configured in a way that we have 3 networks as shown. Router advertisments are enabled on both routers R1 & ...
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IPV6 Small Business Implementation - Windows DHCP/DNS, PFSense, IPV6

I have some confusion about IPV6 on a Small Business Network. I'm sure one part or the other is covered extensively, but I can't seem to find answers. (Background info) I have a home network that ...
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0answers
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Linux kernel 4.9 not responding to neighbour solicitation

I have this small network where Linux kernel 4.9 acts as a v6 router. There are two other servers connected to this router and both have ipv6 address configured on interfaces connecting to this router....
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1answer
253 views

Adding a whole IPv6 /64 block to a server using Netplan

I have read Adding a whole IPv6 /64 block to an network interface on debian We want to make use of the AnyIP feature to add a whole IPv6 /64 subnet block to a web hosting server but using Netplan ...
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2answers
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How to Enable IPV6 on Windows Server 2012 R2 (Cloud Google VPS)

I'm new to Cloud Google VPS. Since it's free, I am testing some Windows Server with 2012 R2 OS, but having a problem enabling IPv6 IP Address. Help would be greatly appreciated!
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1answer
66 views

Postfix IPv6 Relay access denied

I recently set up my postfix server with both ipv4 and ipv6. I am noticing that whenever my other server is sending the emails and it is received by the postfix server on ipv6, it is logging a "Relay ...
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0answers
118 views

fail2ban does not add chain to ip6tables

I am using fail2ban-0.10.2 on Ubuntu 18.04. I have the following action configured in fail2ban, called ipset-simple.local: [Init] protover = 4 iptables = iptables -w blocktype = DROP [Init?family=...
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0answers
111 views

Is it possible to configure an IPv6 multicast address to a NIC?

Is it possible to configure an address from ff00::/8 address block to a NIC? Looks like it is not possible: # ip a add ff99::1/8 dev p2p1 RTNETLINK answers: Cannot assign requested address # # ip ...
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2answers
702 views

NGINX SSL does not respond over IPv6

On a Debian server with nginx, I get no response from a web server over HTTPS and IPv6. HTTP works fine. netstat reports port 443 listening on the IPv6 address firewall is open, ipv6scanner.com ...
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1answer
3k views

Should my website have an IPv6 address?

My website only has an IPv4 address. With IPv6 being the future, is it possible that some users may not be able to reach the website if it does not have an IPv6 address? Also, does having an IPv4/IPv6 ...
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23 views

Netfilter: force IPv6 client to use another source address

I have a network with two IPv6 subnets: one is a native connectivity and one is a Hurricane Electric 6in4 tunnel. When clients initiate a connection towards the Internet, they usually choose a source ...
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0answers
52 views

docker containers give out blank ipv6 address

I am trying to develop simple swarm service with docker, I am using below docker compose file version: '3.2' services: sessions: image: redis:4 ports: - 6379:6379 ...
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1answer
108 views

Curl does not fall back to ipv4

I have gentoo build with ipv6 and ipv4 configured for localhost /etc/hosts # IPv4 and IPv6 localhost aliases 127.0.0.1 sunils-pc.homenetwork sunils-pc localhost ::1 sunils-pc.homenetwork ...
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How to configure ip6 gateway routing with a wildcard

We have a number of devices that need bidirectional traffic with our servers. Each of these devices has an address prefixed by their gateway (they are IoT devices sitting on a local mesh network, ...
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30 views

Differences between IPV4 to IPV6 transition methods

After some research, I found 3 main methods in order to establish the transition from IPV4 to IPV6, Dual Stack Tunneling Translation Now, I can understand them all and how they work, but very few ...
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2answers
466 views

IPv6 Gateway outside network (OVH)

We a dedicated server at OVH, assigned 2001:41d0:a:72xx::/64 I have set the machines on a segment bridged to the wan, as per IPv6 public routing of virtual machines from host The gateway is 2001:...
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1answer
132 views

IPv6 /56 subnetting to Virtual Machines

My network provider has allocated me a IPv6 /56. My goal is to give a /64 to each virtual machine I have. They told me they would route the /56 to my CentOS Xen server and I would have to handle the ...
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1answer
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Two ipv6 tunnels on one host

I have host with additional IP addresses. We will call them as 51.52.53.54 and 71.72.73.74 and two ipv6 tunnels with /48 subnets. Tunnel provider gives example configuration and I configured my first ...