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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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How to determine whether the wireless adapter in my computer is configured for IPv6?

After some correspondence my ISP flipped some switch to enable the router to get what the router calls a "Default IPv6 Gateway." My Ethernet-connected PC can now use IPv6 without issue: $ ping -q -c ...
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IPv6 with docker and traefik on Ubuntu [on hold]

I want to enable IPv6 with my current setup. I rent a Hetzner Cloud Server and run traefik, my application and a database each one in a seperate docker. Currently only IPv4 is working but I also want ...
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50 views

Can mDNS be used to resolve to a link-local address? [migrated]

In an earlier discussion on the topic of IPv6 Link-local addresses I saw a comment which stated: Some would argue that using addresses instead of host names should be discouraged, for any type of ...
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Unable to wget for ipv6

I tried wget using the following command wget -6 https://[fe80::] But it displayed the following error Connecting to [fe80::]:80... failed: Invalid argument.
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1answer
27 views

Test IPv6 windows + VirtualBox (Ubuntu) [closed]

I have client(Linux)-server(Windows) application. I have Windows 7 as a main OS and Ubuntu 18.04 on a VirtualBox. I need to test that the client can connect to the server through IPv6. How do I setup ...
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1answer
30 views

how to assign an IPv6 static address [closed]

I have several IPv6 devices (custom built Linux) and my development machine (Fedora 30). They are all connected to a switch. I'm able to login to the devices through a serial port, i.e. I can talk to ...
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1answer
52 views

unable to ping ipv6 device with linklocal address

I have an IPv6 device with link local addressfe80::204:9fff:fe04:7fb5 (output of ifconfig is below). My machine has an address fe80::d939:2d31:6fe2:c203. I tried to ping both ways (from machine to ...
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Adding Options To IPv6 SLAAC RA-learned default routes that survive RA-updates

I use IPv6 SLAAC to distribute routing information in my network. The default route has a lifetime of 1800s and is getting regular updates through the router. However, if I modify the default route, ...
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1answer
106 views

How do you remove bad DNS server IPs from systemd-resolved?

So I was testing a router and it added some random IPv6 addresses to all the machines on my network, including my DNS server. Somehow those IPs were broadcasted around as valid DNS servers (not sure ...
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1answer
125 views

How to connect to a IPv6 service using IPv4 connection on CentOS 7?

I'm trying to work out how to connect an inbound IPv4 connection to a port listening on a IPv6 port on a CentOS box. To demonstrate on a vanilla CentOS 7 server: Confirm bindV6only is disabled $...
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1answer
184 views

How to add static ipv6 route with systemd-networkd

I'm trying to achieve the equivalent of the ip command below via networkd without success. ip route add default via fe80::1 dev eth0 My networkd configuration looks like below and brings up the ...
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0answers
107 views

ntp using ipv6 address instead of ipv4

I have a laptop running a version of Linux ( 3.12 ). I have ntpd installed and configured to sync with time.google.com. The problem I am having is if I am plugged into a network that only provides ...
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1answer
160 views

Network manager registering thousands of IPv6 addresses

I was noticing Network Manager and nm-applet were taking a lot of CPU, and in the process of inspecting it, I ran ip a. There were thousands of temporary addresses associated with my Ethernet device. ...
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43 views

Issues with IPv6 and Apache2

So I'm trying to set up an Ubuntu server with the web application running on IPv6 using an Internal adapter. I honestly do not know what the issue is. I've tried changing the adapter that is hosting ...
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0answers
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What's the purpose of use_tempaddr=1 kernel parameter?

Reading sysctl docs, I found the following: use_tempaddr - INTEGER Preference for Privacy Extensions (RFC3041). <= 0 : disable Privacy Extensions == 1 : enable Privacy Extensions, ...
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1answer
136 views

Using OpenSSH to create overlay IPv6 network [closed]

If there's a SSH setup like this: Host A -> Host B <- Host C Where Host C is behind a NAT/firewall an opens a reverse tunnel to Host B and Host A connects to Host C via Host B (ProxyCommand). ...
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1answer
75 views

IPV6 aliases in rc.conf

I am currently running FreeBSD 12.0-RELEASE-p2, and I can't figure out how to create both IPV4 and IPV6 aliases for a loopback (lo1) interface using rc.conf on boot. Here is a snippet of my rc.conf: ...
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1answer
279 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 :::*
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81 views

Multicast ICMPv6 comes back with conntrack state invalid

I was playing arround with the Multicast feature of IPv6. $ ping ff02::2%wlp3s0 This should normally result in an echo-reply from all the routers on your local network segment (Wikipedia - IPv6). So ...
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233 views

How does avahi enable mDNS and expose it via LAN with ipv6 compared to Apple's mDNSResponder?

I'm using a device with Linux 4.9 and systemd-networkd. With ipv4 everything is ok, so I want to talk only of ipv6. In fact, I completely disabled ipv4 to use ipv6 with DHCP. So this is my initial ...
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285 views

IPv6-subnets with systemd-networkd

My new ISP gives me a public IPv6 address with a /56 prefix to play around: 2001:b:c:d:5:6:7:8/56 I would like to create two subnets divided by a linux server like this: internet - fritzbox - ...
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1answer
364 views

Enabling rp_filter loose (#2) mode for IPv6

does anyone have a solution to make reverse path filtering work (in loose mode) also for IPv6 and not only for IPv4? The setup I am having is a machine1 connected directly to a machine2, while ...
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1answer
325 views

web server is unreachable : Connection refused [closed]

I am hosting my website on Plesk with AWS EC2 Ubuntu server 18.04. All things are working correctly except IPV6. I am trying to make my website Ipv6 enabled but fail to do so. every time it's showing ...
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1answer
72 views

How to use sed to obfuscate an IPv6 address

I have the following sed command sed -i 'test.log' -e 's/\([0-9a-fA-F]\{1,4\}\:\)\{7,7\}[0-9a-fA-F]\{1,6\}/\1\w/g' The goal is to erase the last two blocks of the IPv6 address. However, this sed ...
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1answer
45 views

Cannot assign additional IPv6 addresses to Debian Jessie server

I've got a /64 IPv6 subnet and I'd like to use additional v6 addresses now. => /etc/network/interfaces: iface ens18 inet6 static address asdf:asdf:asdf:asdf::1 netmask 64 gateway fe80::1 ...
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1answer
249 views

IPv6 routing Public to a subnetwork

Doing Linux/Debian IPV6 Routing from my vendor to a client not working. IPV4 NAT/routing is reliably working using iptables and dnsmasq, however, even with forwarding enabled on IPv6 I can't make it ...
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0answers
27 views

Cannot connect with IPV4 servers [closed]

IPV6 works fine, but IPV4 does not. I can: resolve dns names just fine (dont think its an dns issue) I am connected to the AP correctly (dont think its a connectivity issue) I have a IP address (...
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1answer
289 views

Linux IPv6: Specifying policy routing table for default gateway learned from a router advertisement?

Is there any way to tell the kernel which policy routing table should receive the default route learned from an IPv6 router advertisement? My home network has native IPv6 service from Spectrum and a ...
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1answer
308 views

ping6: 'Name or service not known' when using %iface notation

From man ping: -I interface interface is either an address, or an interface name. If interface is an address, it sets source address to specified interface address. If interface in an interface ...
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1answer
74 views

Can't ping anything when IPV6 is disabled

When I disable IPV6 on my Debian install I can't reach the internet, and whenever I ping anything I get ping: unknown host ... This is how I am currently disabling IPV6 net.ipv6.conf.all....
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132 views

Why IPv6 connectivity on OpenVPN network failed after short time?

I use OpenVPN TUN network. IPv4 works fine. But I have added support for IPv6. I have a problem with IPv6 connections. IPv6 works fine only for short time. When I ping tun0 IPv6 address on my VPN ...
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1answer
734 views

gpg: keyserver receive failed: Address family not supported by protocol

System: Linux Mint 19 Cinnamon, based on Ubuntu 18.04. Upon my limited knowledge of gpg, which version I will state here for future references: gpg (GnuPG) 2.2.4 libgcrypt 1.8.1 I thought the ...
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0answers
46 views

multiple ipv6 from range on one machine

I have a debian server and a pool of ipv6 addresses with 64 mask. I want to split all ips between multiple servers, but configure it through masks, without adding 4 million ips to /etc/network/...
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2answers
456 views

IPv6 address range for LAN static IP assignment

When assigning static IPs for my IPv4 LAN I select a range of addresses from my router's DHCP range. 192.160.0.2-255. So I set the upper limit of the DHCP range and choose static IPs above that limit. ...
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0answers
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Ubuntu 14.04.5 LTS sends an IPv6 NS message for link-local address for no obvious reason

After sending an ICMPv6 echo request message to random global address, my router sends my PC a Neighbor Solicitation message in order to make an association between its link local IPv6 address and a ...
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1answer
88 views

What does “localhost:tram” message means?

I have deployed an application in Glassfish. I see "localhost:tram" in the list of open files : java 30842 user 1589u IPv6 555599352 0t0 TCP localhost:57171->localhost:tram (CLOSE_WAIT) java 30842 ...
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1answer
276 views

IPv4 and IPv6 sockets with same port

Is it possible to have a single process that would have two sockets, one using the AF_INET and one using the AF_INET6 families, while both being bound to the same port number, e.g. 20000? If the IPv6 ...
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1answer
430 views

Bind DNS configuration - IPv6 LAN, netplan

My ISP has introduced IPv6 to my world and I am happy for that so I don't want to just disable it. However it has introduced some issues. My issue of the moment is that I want my LAN bind DNS to use ...
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3answers
345 views

System with just IPv6, not IPv4?

https://web.archive.org/web/20160528234959/https://wiki.freebsd.org/IPv6Only discusses a FreeBSD image that supported only IPv6, not IPv4. That page is no longer live, though (hence my archive link), ...
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3answers
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How to disable IPv6 in Debian when sysctl.conf and GRUB_CMDLINE_LINUX doesn't work? [duplicate]

First, if I issue sysctl net.ipv6.conf.all.disable_ipv6=1 from the command line after the system has started, I get the result I want -- IPv6 is indeed disabled. Now for the problem of making this ...
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1answer
322 views

Linux OpenWRT IPv6 Neighbor discovery

My ip -6 nei commands is showing available neighbors only after pinging them. Is there a way to populate the IPv6 neighbor table once the link is up and not only after traffic is being sent?
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148 views

Any way to advertise preferred IPv6 address with rtadvd

I have both native and HE-tunnel IPv6 addresses on my router (FreeBSD 10.3-RELEASE-p20). Hurricane electric prefix is static, native prefix is not guaranteed to be static, it is obtained by prefix ...
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0answers
69 views

6PE (RFC 4798) support on ubuntu

I notice that in the newer kernels, support for RFC 4798 has been added through the means of IPV4 mapped addresses. I do have a route pointing to the mapped address being the nexthop and I'm unable to ...
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1answer
132 views

Disabling openssh client AAAA DNS queries

I have a Stretch-based desktop with IPv6 disabled, both as parameter in the kernel. I have the ssh client from the openssh-client package, version 1:7.6p1-2.0nosystemd1, installed. Upon debugging a ...
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1answer
281 views

How to check whether kernel received MLD query or not?

On the Internet I found this command netstat -p icmp6 -s which can dump how many MLD queries received by the kernel. But I have Busybox for my system and because of this I'm unable to run netstat ...
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2answers
1k views

rpc bind errors when disabling IPv6

I'm using the kernel command line parameter ipv6.disable=1 in my boot loader (systemd boot) to disable IPv6. However, with that option, I now get these errors in the journal after booting up. Jul 09 ...
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0answers
274 views

How to set up ipv6 home routing?

I've got a IPv4 only ISP and get a public IPv4 address from them. On my router, a Linux machine, I've setup a 6in4 tunnel using a tunnel provider. So I now have a tunnel interface (point-to-point) ...
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2answers
2k views

What are the essential iptables rules for IPv6 to work properly?

I had a problem where I lost connectivity to a server on the IPv6 address after some time and it turned out to be caused by DHCPv6 client packets (port 546) being dropped by the default INPUT policy ...
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1answer
80 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 ...
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1answer
880 views

IPv6 link-local address in /etc/hosts

I have an entry like this in /etc/hosts: fe80::XXXX:XXff:feXX:XXXX%enp0s25 test-ipv6 This is a link-local address. I've masked out my MAC address (with the 7th most significant bit flipped) for ...