Questions tagged [ipv6]

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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37
votes
2answers
10k views

What is the difference between “all”, “default” and “eth*” in /proc/sys/net/ipv[46]/conf/?

In sysctl, the /proc/sys/net/ipv[46]/conf/ keys have the following subkeys: all, default, and a key for each network interface. For example, on a machine with a single network interface eth0, it will ...
3
votes
1answer
4k views

Disabling IPv6 on Mint and Debian

How does one disable IPv6 completely (for all interfaces, resp. for the whole machine? Keep in mind, I don't want any kind of GUI solution. OS in question: Linux Mint 18.x Cinnamon 64-bit GNU/Linux ...
240
votes
9answers
169k 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 ...
5
votes
2answers
2k 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 ...
6
votes
2answers
380 views

The first email bounces; the second and subsequent emails go through

550 relay not permitted That's the error message when email sent by Exim4 from my Debian laptop bounces. What's weird is that only the first email bounces. Second and subsequent emails pass through ...
13
votes
1answer
16k 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 ...
19
votes
2answers
42k 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 ...
10
votes
4answers
3k views

IPv6 addressing, dynamic prefix static local part

The router on my network hands out an IPv6 prefix assigned by my ISP. This prefix is dynamic but "fairly sticky". I would like my machines to automatically pick up the prefix advertised in the RAs, ...
6
votes
3answers
25k views

SSH login via IPv6 successfull while using IPv4 to the same host yields “Permission denied”

I'm currently stumped by a strange problem… I have a dual stack host to which I want to SSH. If I connect via IPv6 everything works like expected datenwolf@foo ~/ > ssh -6 bar.example.com Password:...
3
votes
1answer
6k 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 I ...
1
vote
1answer
1k views

does :::80 in netstat output means only ipv6 or ipv6+ipv4?

If I am listening on :::80, is it listening on all ipv6 or all ipv6+ipv4? This is my netstat -tln: tcp 0 0 :::8080 :::*
5
votes
3answers
7k 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; ...
5
votes
3answers
2k views

Convert MAC address to Link-local address with bash

How can I convert a Mac address into an ipv6 Link-Local address? you have to add fe80:: at the start and insert ff:fe in the middle furthermore all leading zeros must be stripped
4
votes
1answer
194 views

Why does ping6 resolve foo.localdomain to ::1?

I have a CentOS 7 machine running in VirtualBox. It's connected to a host-only network. The /etc/hosts file contains the following: 127.0.0.1 localhost localhost.localdomain localhost4 localhost4....
2
votes
0answers
312 views

Is there an alternative for net.ipv6.ip_nonlocal_bind on FreeBSD?

On Linux (Kernel >= 4.3) I can "claim" an entire IPv6 subnet by routing it to localhost (sf#403648), and then by setting net.ipv6.ip_nonlocal_bind=1 so that I can bind on any of these addresses. I ...
2
votes
1answer
2k 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:---...
2
votes
3answers
5k 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 ...
11
votes
2answers
2k 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 ...
2
votes
1answer
18k views

wget and cURL an explicit IPv6 Address

You can use the -6 flag in cURL or wget to use the IPv6 address of a domain, like google.com. I was unable to fetch pages by explicitly passing an IPv6 address. I tried: wget -6 http://[fe80::a00:...
0
votes
1answer
125 views

Why after some time I lose connectivity to my host on IPv6 when using ip6tables?

I was experimenting with ip6tables (version 1.6.0) on EC2 instances using Debian 9 AMI, I noticed that after some time I lose connectivity to the server on the IPv6 address while I can still reach the ...
0
votes
0answers
145 views

Why Firefox 60.0.2 (64bit) is much faster when I turn off IPv6 inside of it?

Pages as Facebook and Youtube in Firefox became much faster after I have set true network.dns.disableIPv6 in about:config. Why? Speed became very similar as in case of Google Chrome was originally ...
0
votes
1answer
2k 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 ...