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 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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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 ...
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IPv6 Conf Cisco Router-Firewall

I saw some posts about Cisco around the forum and I'll try to ask you a question about my Cisco IPv6 Set-Up I'm struggling to get a right IPv6 configuration on my Cisco 887VA and Cisco PIX firewall. ...
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According to socket statistics Apache listens only on IPv6, but actually serves IPv4 as well

ss -lnp in server shows following information: # ss -lnp Recv-Q Send-Q Local Address:Port ...
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335 views

ping6 error 'operation not permitted'

I am unable to ping6 my gateway or beyond. I am able to ping6 my loopback successfully, but that is all. [\u@r2d2:/root] # ping6 ipv6.google.com PING6(56=40+8+8 bytes) 2001:19f0:7000:8945:5400:ff:...
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Ubuntu Configuring static route with IPV6

I am having trouble getting ECE4110Host1 to ping ECE4110Host2 via static routing. I did it in IPV4 but not sure why I cant get it in IPV6. In the ECE4110Host1 command I enter: sudo ip -6 route add ...
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1answer
85 views

Network interfaces up order, ipv6 tunnel problem

I have a ipv6 tunnel interface, that is using my network connection on eth0. when I turn on my system something messes up the things and I have no ipv6 connectivity. The system is Ubuntu 14.04 server ...
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51 views

IPV6 ND router advert Malformed packet

Am trying to simulate IPv6 ND router Advertisement packet in openvswitch for one of my projects, but the formed packet is malformed(analyzed it in wireshark). Following is the packet dump I created, ...
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262 views

What's the use for the special ipv6 addresses in /etc/hosts?

I have the following block in my /etc/hosts: # The following lines are desirable for IPv6 capable hosts ::1 localhost ip6-localhost ip6-loopback fe00::0 ip6-localnet ff00::0 ip6-mcastprefix ff02::...
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910 views

centos: ping6 unknown host

I have centos 6.5 with ipv6 enabled and working (partially). When I'm trying to execute "ping6 bin6.it" it returns error "unknown host": [root@centos ~]# ping6 bin6.it unknown host Host is ...
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What's ndisc_cache?

Suppose I want to use : $ ip ntable show dev eth0 inet arp_cache dev eth0 refcnt 4 reachable 20744 base_reachable 30000 retrans 1000 gc_stale 60000 delay_probe 5000 queue 31 ...
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21 views

how unshare -i/-p/-U and -r works in realtime

Can anyone give examples of unshared command for -i, -p, -U and -r options. I got only -m and -n examples to test my code. And please mention any test cases to test IPv6 for unshared too. Thanks, ...
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49 views

OpenVZ OpenVPN IPV6 Routing Problem

I have an OpenVZ server with OpenVPN on it, and I also have IPV6 being routed to it. (Currently two /64 blocks) I was trying to route one /64 block to the main system for use with other processes such ...
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3answers
84 views

Adding recursive entries into `/etc/hosts`

I'd like to add shorthands for various FQDNs into the /etc/hosts file, such as: pyrrha.compsci.university.org. pyrrha Is there a way to force the local DNS resolver to process the /etc/hosts ...
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1answer
2k views

enp3s0: link is not ready

I've some strange messages in the dmesg output: [ 7.588762] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready [ 7.589616] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready [ 7.591897] ...
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1answer
460 views

Blocking SSH Brute Force attacks on IPv6

I recently had to work with some servers that have an IPv6 connection and I was surprised to find out that fail2ban does not have IPv6 support, neither does denyhosts. Searching on google I found that ...
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1answer
766 views

Why is my CentOS 6 system doing IPv6 lookups?

I have a fairly recently installed CentOS 6.6 system. I have disabled IPv6 as best I can: IPV6INIT=no in ifcfg-[eth0|lo] net.ipv6.conf.all.disable_ipv6 = 1 in /etc/sysctl.conf net.ipv6.conf.default....
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122 views

Centos 7 with facebook php-sdk4 - Network is unreachable

I am not sure why I am getting this error. Sometimes, it works and sometimes I get this error in the error log: Exception: Failed to connect to 1a02:1234:f000:4:face:b00c:0:1: Network is unreachable ...
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Linux Routing Question

I was wondering how it would be possible to have multiple IPv6 default gateways on CentOS linux. I currently have two interfaces with IPv6 (venet0 and tb0), both with different blocks routed to them. ...
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1answer
147 views

To stop auto generated IPv6 link local address

How can I stop assigning of link local IPv6 address? I have tried to do it by disabling the accept_ra and autoconf options, but it is not working.
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239 views

Assigning link, site and global IPv6 address

How can I assign link, site and global IPv6 addresses at a same time using /etc/network/interfaces file? I am able to assign any one of them address at a time.
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Having problems when connecting pppoe in my Kali Linux

Here is my log: Jun 6 04:57:23 unknown pppd[3333]: pppd 2.4.5 started by root, uid 0 Jun 6 04:57:36 unknown dbus[2534]: [system] Failed to activate service 'org.freedesktop.Avahi': timed out Jun 6 ...
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520 views

Force IPv4 over IPv6 only for certain addresses

I'm currently running Debian 8 and I'm trying to force applications like Google Chrome to use IPv4 over IPv6 only for certain sites. My ISP natively offers IPv6 and it's amazing on all websites that ...
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3answers
131 views

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
127 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 scenario:...
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469 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
94 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 leftcert=/home/root/ABCDCert....
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1answer
717 views

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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175 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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208 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 server-...
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1k 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 net.ipv6.conf.eth0....
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1answer
614 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
458 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
746 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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985 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
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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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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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270 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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2answers
129 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 ...
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462 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
950 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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2answers
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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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238 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 Bcast:192.168.1....
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728 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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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
145 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 sec...>...
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2k 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 2001:...
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371 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 ...