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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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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6 views

radvd “received RS or RA on $iface but $iface is not ready and setup_iface failed”

Clients don't get theirs ip`s. Errors in /var/log observed: version 2.11 started May 25 15:51:22 user-VirtualBox radvd[10570]: Starting radvd: radvd. May 25 15:51:24 user-VirtualBox ...
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1answer
30 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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30 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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12 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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10 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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36 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
17 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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36 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
45 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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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 ...
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35 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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20 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
27 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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39 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 ...
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37 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
48 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
43 views

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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49 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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98 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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1answer
44 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
127 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
37 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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44 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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17 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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39 views

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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1answer
70 views

Connections via IPv6 are reset while IPv4 works fine

I just set up a new Arch Linux system. Most networking applications (pacman, git, spotify e.g.) seem to be working just fine. All IPv6 connections though are reset by the server. curl -6 google.com ...
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51 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
243 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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71 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
188 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 ...
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1answer
65 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 ...
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3answers
487 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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114 views

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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53 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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104 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 ...
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0answers
152 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
150 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
235 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] ...
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1answer
282 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 ...
4
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1answer
158 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
125 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 ...
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109 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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159 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
78 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
77 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
89 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 ...
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57 views

How to disable IPv6 ping response in Linux without firewall

How can I disable IPv6 ping responses in Linux without using the IPv6 firewall? This question covers how to do this using the IPv6 firewall via iptables, but I'm using an embedded system that doesn't ...
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170 views

IPv6 delete route

Some times ago I played around with the IPv6 routes and I made confusion :) That is my routing table root@banana:~# route -6 Kernel IPv6 routing table Destination Next Hop ...