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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Debian - No wired connection after restart

Last night I was working on my computer, for reference I'm using i3, and decided to uninstall XFCE4, as I felt I didn't need it. The next morning I turned on my computer and have no wired connection. ...
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Resolving hostname takes 5 seconds

I've a master bind9 DNS server and 2 slave servers running on IPv4 (Debian Jessie), using /etc/bind/named.conf: listen-on-v6 { none; }; When I try to connect from different server(s) each ...
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1answer
47 views

Unprivileged ping6 not working

I am trying to get my CentOS v7 server to run IPv6. Root works, it can ping using "ping6 ipv6.google.com", and ifconfig looks great; I see the lines: eth0: flags=4163<UP,BROADCAST,RUNNING,...
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OpenVPN with /112 IPv6 subnet, unable to route to eth0 and vice-versa

I'm trying to set up an IPv6-enabled OpenVPN server. The provider only gave me a /64 subnet : 2a06:1700:1::640/64. Here is the OpenVPN configuration : port 1194 proto udp dev tun0 server-ipv6 2a06:...
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23 views

Should DNS (PTR Records) be configured differently for different ipv6 networks?

I am configuring DNS forward and reverse lookup for IPv6(Redhat). For both /64 and /120 prefix i am using below configuration for PTR records. for address 6b00:8a00:a000:11a1::a2b:1c9f (Only a ...
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1answer
35 views

how do I add a second ipv6 address on Linux without making it default

I would like to add an extra IPv6 address so I can run a service on it but I want to retain the existing IPv6 address as the address to use for outgoing connections. When I add an ipv4 address with ...
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42 views

Generate IPv6 reverse PTR records for /64 subnet

I use SixXS and delegated the reverse PTR ip6.arpa zone to my own NS servers, so I am able to set up forward-confirmed hostnames within my subnet. This is great. A particular /64 subnet I designated ...
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17 views

BindAddress in ssh config on laptop

I have a section in my ~/.ssh/config for connecting to a server via IPv6. But as I have enabled privacy extensions for IPv6 and to avoid my ssh connections being cut I've added BinAddress to that ...
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11 views

IPv6 mapped address supported by the kernel?

How to know if the kernel currently supports IPv4 mapped IPv6 addresses ? I have tried using ping6 ping6 0:0:0:0:0:ffff:7f00:1 but I get Network is unreachable.
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1answer
60 views

IPv6 ephemeral port range

In Linux, I can get and set the range of ephemeral ports through /proc/sys/net/ipv4/ip_local_port_range: $ cat /proc/sys/net/ipv4/ip_local_port_range 32768 61000 I want to control the ephemeral ...
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1answer
20 views

Are IPv6 link-local addresses assigned by the kernel or by a userspace program

When IPv6 is enabled for an interface, it will get a link-local address assigned automatically based on the MAC of the network interface. But who assigns this address? Is it done in the kernel, or by ...
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45 views

Raspbian Jessie: /etc/network/interfaces doesn't apply inet6 address. How to diagnose?

I'm experiencing a strange issue, and I don't really know how to diagnose it, or how to fix it. My problem is, that the static ipv6 assignment that used to work suddenly isn't applied any more at ...
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1answer
60 views

Why are my if-up.d scripts running before DHCP(v6) has completed?

I'm using DHCP and have both IPv4 and IPv6. I want to run a script that updates an IPv6 DDNS service when my network is configured. I created a script at /etc/network/if-up.d/update_dns however this ...
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0answers
15 views

ipv6 rule priority duplication

When I add ipv4 policy rules using ip rule add the resultant rules get added to the end of the policy table with decrementing priority from 32767 eg: # ip rule add lookup 8 # ip rule add lookup 9 0:...
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40 views

How do I run a systemd oneshot service whenever my system gets a new IPv6 address?

I would like to run a systemd oneshot service whenever my system gets a new IPv6 address assigned to it from the network router (this would be on boot, and periodically throughout its uptime). ...
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21 views

I am redirected to a router that is not part of my provider's configuration [closed]

Whenever I try to access a website with a .com domain it shows the 'unable to connect page' but when I access a site with my country's domain I get redirected to a Tenda 11N wireless router. I ...
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1answer
37 views

IPV4 getting removed after restart CentOS machines

I have CentOS machines (both 6.x and 7.1) and whenever I reboot them, automatically IPV6 is assigned to them and IPV4 is lost. Any idea why it is happening and how to prevent it? I Could not ...
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41 views

Static IPv6 not retained despite configuration

I want one of my machine to get a static IPv6, which should be allowed by my ISP. When I configure the machine for a static ip, it works well for a few days/months, then I get assigned a different IP....
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49 views

CJDNS `Network is unreachable`

I'm not shure if this question belongs here, but anyway. I was trying to run cjdns on my android phone (OnePlus One runnig CyanogenMod 13) (actually tried on several devices), but it ain't working. It ...
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1answer
60 views

KVM bridged interfaces not going up - inet, inet6 , bridge

I am setting up KVM host which will have multiple virtual machines visible from the outside with a similar /etc/network/interfaces config to this one # The loopback network interface auto lo iface ...
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2answers
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Fedora Core 4 won't get an IPV4 address

I have a fedora core machine, and it is picking up an IPV6 address, but not an IPV4 address. I have done dhclient -r eth0 but the ipv4 address has not come. I have reset the port using ifconfig, but ...
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62 views

How to avoid curl trying IPv6 name resolution

From a docker container when I try to curl 'another container name', curl first tries to resolve the name to IPv6. This causes few seconds delay because the web server is not reachable over ipv6. I ...
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119 views

Is there a browser that supports IPv6 Link Local addresses?

I'd like to know at last one browser that allows me to browse fe80::4216:7eff:fe9f:79ac%enp2s0f0, for example. I've checked there're many tickets open in bug trackers of big name browsers like Firefox ...
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1answer
11 views

How to disable autoconf feature of IPv6 usinf interfaces file?

I am using linux 3.2.0. I want to disable autoconf feature of IPv6. For that I have added following lines in /etc/network/interfaces file. iface inet6 eth0 static address <IPv6_address> netmask ...
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51 views

Old IPv6 address does not disappear using another router

My computer connects to a router via an ethernet cable. I have then an global address IPv6 for example : a::face/64. Here is my network configuration at the auto-configuration mode : auto eth0 iface ...
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1answer
149 views

Why are IPV6 privacy extensions not working in Arch Linux?

I have native IPv6 via my ISP, with a routed /64 block. IPv6 is working on my internal network. (ie. I can ping ipv6.google.com) All devices on the network have IPv6 addresses allocated, and with the ...
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1answer
38 views

Adding IPv6 breaks StackExchange [closed]

I added IPv6 on my Ubuntu 14.04.3 LTS laptop by adding an OpenVPN tunnel to my Ubuntu 14.04.3 LTS server that has IPv6. I am using masquerading on both IPv6 and IPv4. Using StackExchange used to ...
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1answer
46 views

Using IPV6 in Hetzener under KVM virtualization

I have a VPS which is being managed with SolusVM + KVM in Hetzener data-center. I got one IPv6 but don't know how set it up. I tried this, did not work for Debian 7 64 bit: iface eth0 inet6 static ...
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21 views

ipv6 connectivity problems

I've got persistent ipv6 problems with my laptop running kubuntu 15.10 : download speed is very slow, and some transfer just end up totally stalled or timed out (ipv4 runs perfectly fine). It's not a ...
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Manually configure Link-Local IPV6 regardless of ISP

The long and short of it is we have a system with a single ethernet port and we need to provide both an IPV4 connection (that can be completely incontrol of the user and varies per system) and we want ...
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55 views

DNS problem with ipv6 on centos6

I have a couple of open-stack instances that communicates with github.com. When any of these machines reboots , the file /etc/resolv.conf gets the ipv6 addresses of my DNS servers. Everything still ...
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1answer
317 views

cannot read key “net.ipv6.conf.all.stable_secret” in sysctl?

I am running kernel version as followings on an Arch Linux computer: [root@router ~ ]$ uname -a Linux router 4.2.5-1-ARCH #1 SMP PREEMPT Tue Oct 27 08:13:28 CET 2015 and I noticed that every time ...
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80 views

IPv6, dnsmasq dhcp-range

I'm trying to assign IPv6 addresses to my LAN clients with dnsmasq 2.62 on Debian Wheezy: enable-ra dhcp-range=interface:br0,fde4:709f:bee2:a87b::,fde4:709f:bee2:a87b::ff,ra-stateless The ...
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2answers
257 views

File exists error while restarting network interface (Debian)

I'm running a Debian GNU/Linux 8 server for school assignments. While trying to do service networking restart, it gave me this error: root@server:~# service networking restart [warn] Running /etc/...
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1answer
80 views

Linux routing IPv6 packets through incorrect interface

I have a Arch Linux system where link-local packets are not being routed properly. I have 4 interfaces on this machine (wan, lan0, lan1 and lan2). All three of the lanX interfaces are bridged together....
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3answers
642 views

Validating IP addresses (IPv4 and IPv6)

Quite simply I'd like to verify that a string represents a valid IP address in a bash script. I think like many others I've fallen into the pitfall of trying to do this with a regular expression; ...
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why i can see ipv6 socket with ipv6 stack disable?

I try to disable complety ipv6 on a Linux Debian 7 (wheezy) However , things escape me. In my case, i test with grafana process (I have same issue with munin, rpcbind etc) Method 1 : with sysctl ...
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66 views

Unable to setup ipv6 on solaris 11.3

I am having some difficulty after moving to Solaris 11.3 and setting up IPv6 addressing. The interface I am using is net2. I have created an IPv4 address already on this. So to do this I would have ...
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110 views

IPv6 router advertisement seems to break OpenVPN setup

I have an OpenVPN setup on Debian Jessie, or Raspbian to be precise, that provides an IPv4 and IPv6 subnet for the clients. The server configuration of OpenVPN contains: dev tun server-ipv6 fdd2:af8b:...
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0answers
180 views

curl request to IPv6 localhost gets stuck

A docker container of mine exposes a HTTP interface on port 8500, which is mapped to host port 8500. It is not IPv6 enabled. This still means, I should be able to access it at localhost:8500. IPv6 ...
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1answer
229 views

Resolving IPv4 address from DNS using the IPv6 address of a host (bind9)

I need to make a DNS query to one of my clients using IPv6 to resolve the IPv4 address for the machine, how would I go about doing that. I know i can just use the hostname to resolve both IPv4 & ...
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0answers
254 views

Systemd networking: IPv6 networking not available at boot

I've a Debian machine running multiple static IPv4 and IPv6 addresses managed by systemd itself at /etc/systemd/network/10-static-eth0.network as follows: [Match] Name=eth0 [Network] Address=2a04:---...
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320 views

THC-IPV6 Kali Linux 2.0

After I have upgraded to Kali Linux Sana I have noticed that the THC-IPV6 kit ,with tools such as flood_router26, has disappeared. If somebody could tell me where it is, or how to install it again, I ...
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1answer
179 views

What is the IPv6 equivalent for 127.0.0.0/8

I am trying to set up an IP6tables firewall on Linux and I basically want to start copying my IPv4 configuration. One of my rules simply accepts all traffic to the localhost subnet: iptables -A ...
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1answer
136 views

Can't enable net.ipv6.conf.eth0.autoconf

I can't get net.ipv6.conf.eth0.autoconf to = 1. Goes back to 0 after every reboot causing eth0 to never auto-acquire a global IPv6 address. I am running a headless Debian Jessie (kernel 3.16.0-4-...
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119 views

How to make OpenWrt router advertise itself as IPv6 default gateway?

I have an OpenWrt Barrier Breaker router which is configured with a /48 ULA prefix. Connected Windows clients have two established routes to this space: /64 On-Link and /48 via link-local address. ...
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185 views

OpenWrt wifi bridge with IPv6

I am running OpenWrt 15.05 on my WDR4300. My ISP is via cable with legacy-IPv4-only. For IPv6 connectivity I use HE.net tunnel to receive a static IPv6 /64 subnet. My office is in a different room ...
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1answer
95 views

Cannot make ipv6 ULA addresses work

I wanted to assign Unique Local Addresses (ULA) to a couple of machines inside my LAN alongside the link-local ones and the globally routable ones. I am currently running dual stack. I also wanted to ...
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1answer
88 views

Cannot ping a tap device with ipv6 address

I'm running CentOS 7. First I created a tap device: ip tuntap add dev tap2 mode tap Then I assigned ipv6 address to it: ip -6 addr add dev tap2 fd00:4::1/64 ip link set tap2 up Its state ...
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2answers
126 views

Retrieve IPv6 address of website using terminal

Both the nslookup and host commands return IPv4 addresses only. How can i retrieve the IPv6 address of a website using the terminal? (I have googled around, unfortunately I couldn't find anything ...