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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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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1answer
59 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
2k views

How can I disable IPv6 in custom built embedded setup

I have an embedded system built using buildroot. I have had a number of network issues, one of which is that my machine cannot see its gateway despite it being on the same subnet. I have tried using ...
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0answers
23 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
62 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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2answers
454 views

How to configure dhcpd to register ipv4 with bind while having static ipv6 addresses?

I have IPv6 configured on my local network via radvd; it advertises a routable IPv6 block, that all the machines auto-configure.s I have IPv4 assigned to a NAT'd block via dhcpd and that updates ...
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0answers
29 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
47 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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0answers
35 views

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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3answers
173 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
96 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
47 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 ...
4
votes
1answer
42 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 ...
2
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2answers
61 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
39 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
44 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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8answers
34k views

Convince apt-get *not* to use IPv6 method

The ISP I work at is setting up an internal IPv6 network in preparation for eventually connecting to the IPv6 internet. As a result, several of the servers in this network now try to connect to ...
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0answers
23 views

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 ...
4
votes
2answers
162 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 ...
4
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2answers
112 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 ...
2
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0answers
79 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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0answers
46 views

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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1answer
75 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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votes
3answers
2k views

DHCPv6 prefix delegation server for linux?

What linux DHCPv6 client can I set up so it requests a prefix on one interface and then on all the other interfaces it will give out addresses (or if requested, a smaller prefix delegation)? It would ...
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1answer
1k views

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 ...
2
votes
1answer
57 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
228 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 ...
2
votes
1answer
93 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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1answer
64 views

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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0answers
115 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 ...
2
votes
1answer
1k views

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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0answers
176 views

DD-WRT: dhcp6c not fetching new address for ppp0

I'm currently trying to configure my DD-WRT-based router to do IPv6. Now I'm at a point where it works fine - until the line is disconnected and reconnects (which happens at least every 24h... for a ...
4
votes
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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2answers
267 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
141 views

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
132 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
296 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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0answers
144 views

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
93 views

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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0answers
16 views

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" ...
0
votes
1answer
66 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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vote
1answer
177 views

Define specific TTL for each interfaces

After some research, I was wondering if it was possible to define a TTL by interface as I can the Hop Limit definition in ipv6. To change the TTL in IPv4, I can change the file ...
2
votes
2answers
2k views

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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2answers
478 views

Linux: Is there a IPv6 equivalent to the IPv4 kernel option accept_local?

Since linux kernel >= 2.6.33 the kernel option "accept_local" can be modified: /proc/sys/net/ipv4/conf/${interfaceID}/ accept_local - BOOLEAN Accept packets with local source addresses. ...
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1answer
48 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) ...
2
votes
1answer
697 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 ...
5
votes
2answers
281 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 ...
2
votes
2answers
230 views

IPv6 NDP timer problem

Need to change Fedora Linux's IPv6 stack for NDP DAD timer changes. How to locate the Fedora's IPv6 and IPv4 stack in Fedora distribution dvd/site so that, we can recompile and generate new stack ?
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votes
3answers
6k views

Is it better to set rules in ip6tables or disable ipv6?

I have the following network configuration: # ifconfig -a eth0 Link encap:Ethernet HWaddr 00:e0:1c:73:02:09 inet addr:10.1.4.41 Bcast:10.1.255.255 Mask:255.255.0.0 inet6 ...
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votes
2answers
13k views

“IPv6 support is disabled” warnings

I get the error while running a script which tries to send emails. send-mail: warning: inet_protocols: IPv6 support is disabled: Address family not supported by protocol send-mail: warning: ...