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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How does the iptables work with IPv6?

I would like to set up a firewall on Linux Debian for IPv6. It is important to use iptables for me. I have tried to change the ipv4 folder to ipv6. How can I set up iptables for IPv6?
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How does Debian select or prioritize IPv4 and IPv6 connections?

I'm going to explain my question with an example. I have two servers, A and B, both runs Debian 7.8, both have dual-stack connection to the Internet (I don't know if it matters but they even have the ...
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1answer
35 views

check tcp packets reception below tcpdump level

I am having an issue with my smartphone device and packets monitoring: I am trying to find a reason why I cannot establish a VPN connection via PPTP protocol. I have the following successful ...
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0answers
52 views

dhcp ipv6 dynamic prefix delegation

I'm trying to setup Linux-based home gateway with IPv6 support. IPv4 configuration is finished and I'm using IPv4 NAT, ISC DHCP for addresses allocation, PowerDNS for local DNS setup, PDNS recursor to ...
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1answer
37 views

ipsec.conf file with dynamic ipv6 address

I have been able to get strongswan ipsec tunnel between 2 linux machines with static ipv6 address. For example, a segment of my ipsec.conf file looks like left=2000::1 ...
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1answer
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Why is my DAD slow?

The last few boots of my Arch Linux, I noticed I had no network access. I'm using a netctl profile to give my adapter a static IPv4 address, which by itself works fine. So I had a look at the logs, ...
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0answers
38 views

How does s_client turn ip6-localhost into 127.0.0.1?

When I use openssl s_client and ask it to connect to ip6-localhost it actually connects to 127.0.0.1 instead of ::1. This is what I see on both Ubuntu and Debian: $ strace -e connect openssl ...
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1answer
84 views

IPv4 goes offline several times per hour on headless remote server, IPv6 unaffected

On my Ubuntu 14.04.2 server IPv4 goes offline several times per hour (one to four times I've seen, but at no particular minute per hour or so). My hoster insists that the problem is on the ...
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1answer
81 views

Permanently disable IPv6, for a given interface?

I'm looking to permanently disable IPv6 on a specific interface because it's broken and my question on Superuser to fix it is dead so how can I go about doing that? I've added ...
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0answers
93 views

FreeBSD: IPv6 in Jails (ezjail)

I'm on FreeBSD 10.1 and in the process of setting up a server. After some hassle I managed to get IPv6 running. I'm now setting up jails with ezjail and I learned how to set up a working flavor and a ...
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1answer
145 views

Not able to resolve IP address for eth1 in Vagrant VM

On runnning ifconfig command I get the following as output. I need the IP address of eth1 for running my python server port with. eth0 Link encap:Ethernet HWaddr 08:00:27:CE:08:3D ...
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Ipv6 Network unreachable Debian

Been trying to configure ipv6 on my proxmox server for about an hour now and I just can't seem to get it right. /etc/network/interfaces: auto lo iface lo inet loopback auto vmbr0 iface vmbr0 inet ...
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1answer
193 views

ip6tables allow IPv6 traffic from OpenVPN through my VPS

I've established a fully working IPv4 OpenVPN setup and wanted to go one step further and experiment with setting up IPv6. My VPS server does not get a native IPv6 block but does have a 6in4 tunnel ...
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1answer
77 views

Link Local IPv6 address keeps being automatically assigned

I'm looking to prevent the IPv6 link local address from being randomly assigned. I'm not looking to disable v6 but rather statically assign my own link local. I've done ifconfig vboxnet0 inet6 add ...
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1answer
65 views

How can I resolve MAC knowing ipv6 addr w/o ip command?

I installed OpenWrt on my router and I wanted to get MAC address of some machine connected to it. With ipv4 I would use arp command. But I want to resolve HW address knowing ipv6 addr. I have read ...
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2answers
78 views

How can I add an IPv6 gateway?

For example: ip -6 route show | grep ^default There is no output. So there's no default gateway for IPv6. also I see some complains from the kernel side of things: dmesg | grep IPv6 eth0: no ...
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0answers
65 views

Flow of ipv4 over ipv6 tunnel

Re-posting my question from stackoverflow I am trying to achieve flow of ipv4 packets over ipv6 tunnel between 2 machines. Initially i had the following setup Linux1 eth0 ...
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0answers
78 views

How can I have hosts register their IPv6 addresses in Windows DNS

Windows clients support registering their IPv4 and IPv6 addresses in DNS after obtaining the address from a DHCP server or via IPv6 Router Advertisements. For my CentOS 7 and Fedora 21 boxes I'd like ...
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How do I make OpenVPN split /56 IPv6 block into /64 subnets for each client?

I want OpenVPN to occupy, for example, 2001:0DB8:5912:1200::/56, assigning /64 subnets of it to clients (so they can serve as SLAAC routers if needed). What should I do? Is OpenVPN alone enough for ...
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0answers
128 views

Why does /proc/net/if_inet6 not contain all IP addresses from 'ip addr'?

Since recently, after moving from Ubuntu 10.04 to 14.04 (kernel 2.6.x to 3.13), I noticed a strange thing about IPv6 addresses. I assign several IPv6 addresses to my eth0 interface to allow the Apache ...
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2answers
273 views

IPv6 connections timeout

I'm having issues with IPv6 connections. Only with those. They timeout roughly every 10 minutes (due to address renewal i suppose). Happens with every debian based flavour of linux i tried in a year ...
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cacti snmp ipv6 snmp error

I configured cacti on centos6.4, only ipv6, when snmpwalk command to check a client, the output is normal, but add monitoring host (ipv6) on cacti, appear "snmp error" error, how can I do? Here is the ...
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2answers
139 views

IPv6 Zone ID in /etc/hosts

I'd like to setup a static hostname for an IPv6 address on local network. It seems, however, that /etc/hosts won't accept a zone ID - when I append a zone ID to an IPv6 address, it acts as if the host ...
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1answer
82 views

Get static ipv6 ip

I'm trying to get an IPv6 IP for my wireless interface. When getting an IPv4 I see this: wlan0 Link encap:Ethernet HWaddr 00:15:00:bf:29:b2 inet addr:192.168.1.128 ...
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3answers
229 views

OpenVPN using IPv6 on VPS

I'm trying to create an IPv6 tunnel using OpenVPN on Debian Sid. IPv4 is working fine, but I can't get IPv6 to work. I can ping the server and other clients using IPv6, but I can't reach the internet ...
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1answer
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How to add ipv6 default route

I have the following setup Linux 1 Linux 0 eth1 eth0-------------------eth0 14.14.14.80 19.19.19.20 19.19.19.10 2005::5/64 ...
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1answer
73 views

Why is ping6 using IPv4 socket?

I enabled IPv6 in a CentOS 7 server and everything is working as expected, except for ping6: it is showing 3-5 delays between requests (but the RTT is fine): $ ping6 www.google.com <...5 ...
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1answer
375 views

Reverse DNS with BIND and IPv6

So I'm trying to set up reverse DNS for an IPv6 address using BIND9, and I'm having a little trouble getting it to work. Assume I have 2001:41D0:2:D447::/64 assigned to my server and I want ...
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1answer
114 views

Manually configure ipv6 address in 2 different subnets

I have a following setup Linux1---------------Linux2------------------Linux3 (eth0) (eth1) (eth0) (eth0) I have this in a local network i.e the Ethernet cables are ...
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0answers
120 views

TCPDump To Capture A Tracepath6 Datagram

I'm trying to use TCPDump to capture an IPv6 datagram using: tcpdump -c 1 -i eth1 -vvvs0 ip6 and dst host H2.net2 & tracepath6 H2.net2 I'm running this script on H1.net1; R12.net1 is the ...
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1answer
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Why does my tunneled IPv6 connectivity drop after a short period of time?

I correctly setup a Hurricane Electric tunnel on a CentOS 6.5 VPS server (KVM). I use CSF (ConfigServer Security & Firewall) which acts as a wrapper for iptables and ip6tables, the default ...
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2answers
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What is the purpose of avahi on a RHEL 7 server?

Running a server machine with CentOS 7, I've noticed that the avahi service is running by default. I am kind of wondering what the purpose of it is. One thing it seems to do (in my environment) is ...
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2answers
434 views

Howto Configure IPv6 on a Debian based system?

I realize this is probably a pretty basic question, but I can't seem to find an answer that makes sense to me. I have experience configuring networks for IPv4, but IPv6 is a whole other beast. I'm ...
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0answers
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Static IPv4 & IPv6 configuration on openwrt linux

The /etc/config/network file has the ipv6 and ipv4 entry for an eth0 interface. Executing ifconfig eth0 shows both ipv4 and ipv6 address of that interface as per configuration. Performing ifconfig ...
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0answers
141 views

Arch Linux sudden wifi disconnects and unable to reconnect

I have a problem with my wifi internet connection that is secured by WPA. I have moved to a new location. I had set up a working internect connection but lost the connection after about an hour and ...
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1answer
355 views

How to set static IPv6 IP address to embedded Linux board using ifconfig (busybox)?

We want to set static IPv6 IP to custom embedded Linux board. So far we could enable IPv6 in Linux kernel and Busybox. We could test that kernel is IPv6 ready. We tried to configure a static IP using ...
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Iptables and Ip6tables redirect traffic

I want to deny all the network traffic and just allow a few ports and redirect them through tor or the socket I have set in /etc/tor/torrc, where tor binds to. And I am currently setting up these ...
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0answers
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Debian, Dibbler, IPv6 and Bridging Woes

I'm currently trying to setup my Dedibox LT as a virtualisation (KVM) server. I've elected to use Debian instead of Proxmox or ESXi for various reasons. Currently I'm having problems with getting ...
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1answer
73 views

nmap ipv6 os scan fails

When scanning a ubuntu machine with nmap using ipv6 address, nmap cannot determine the os type and only print the os fingerprint. Although when scanning the same host with ipv4 address it correctly ...
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0answers
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Correct format to specify the ipv6 address in '/etc/hosts' file [duplicate]

I have configured a server with Gentoo 64 bits that it has IPv4 and IPv6 and they are working well. But I don't know how specify the IPv6 of the server in /etc/hosts file. With or without "/64" ...
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2answers
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netstat — why are IPv4 daemons listening to ports listed only in -A inet6?

I have a computer with: Linux superhost 3.2.0-4-amd64 #1 SMP Debian 3.2.60-1+deb7u3 x86_64 GNU/Linux It runs Apache on port 80 on all interfaces, and it does not show up in netstat -planA inet, ...
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1answer
57 views

iproute command: ip -6 rule show nothing even with kernel option IPV6_MULTIPLE_TABLES=y

I want to enable my linux 3.2.4 to have ipv6 multi-routing table functionality. I enable IPV6_MULTIPLE_TABLES when make menuconfig and rebuild kernel.(Also with ip advanced routing and ip multi table) ...
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2answers
344 views

How to use shell to derive an IPv6 address from a MAC address?

We know that we can use the MAC address to create an interface identifier, e.g. for a link-local IPv6 address which should be unique in the Network. The image shows the way to do this: My ...
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1answer
920 views

Netcat (nc6) - Minimal IPv6 only TCP Server and Client

Im am trying to set up a basic IPv6 only echo-server using netcat (or rather nc6). Client and server are both in the same local network. However, the client quits immediately: IPv6-Server: $ nc6 ...
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IPv6 - how to force traffic destinated for same system but another interface to pass through the wireless network?

I want to perform some IPv6 stress testing (file transfer, flooding, Neighbor Discovery, etc) on wireless routers using a system which has two network interface cards. However, all traffic goes ...
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1answer
2k views

Routing public ipv6 traffic through openvpn tunnel

What I'm trying to do is to route IPv6 traffic through a vpn tunnel. That way, I should be able to use IPv6 in a network that doesn't support IPv6. I have a VPS which has an IPv6 block assigned. Part ...
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1answer
201 views

IPv6 firewall rules seem to impede all connections

After deciding that my small server needed a firewall, I used ferm to configure iptables and ip6tables for me (this question should be tagged ferm, but I cannot create the tag). I am using the same ...
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1answer
203 views

How to log incoming icmp traffic?

I am watching my ip6table and observing an icmp packet arriving and getting dropped at the rate of 1 per second. I am trying to find out what that message is about. I tried using tcpdump (it is ...
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1answer
293 views

How can I allow applications to bind to any address in a subnet assigned to an interface?

I recently got a static IPv6 /56 prefix of my own from Freenet6, and am trying to allow applications to bind arbitrary addresses in the prefix. I modified the tunnel creation script that gogoc uses in ...
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1answer
149 views

How can I make sure that eth1 get its fe80 IPv6 address immediately on startup, even if it's not physically connected?

I'm working on an embedded-x86 Linux device that runs Debian (Linux 3.8.13). This device has two Ethernet ports, eth0 and eth1. If I boot up this device with only eth0 connected to a switch, and ssh ...