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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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Script for Large CSV File to Convert IPv6 addresses to Number (or String) [migrated]

So I have a big csv file, over 1gb. There's a column with IP addresses in ipv4 and ipv6. I want to convert the ipv6 addresses into numbers, but there are too many rows for libre calc. So I'm ...
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Create openvpn server with IPv6

I'm trying to follow this tutorial to offer ipv6 support to my vpn under openvpn. But I do not understand this passage: Here is the content of client-connect.sh. #!/bin/bash BASERANGE="2a00:...
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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
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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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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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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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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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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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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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Not able to forward data to ipv6

Using socat to route incoming ipv6 to ipv6. The destination is a pod/container. From the container tcpdump is used to capture the packet. Am I using tcpdump to verify the incoming packet correctly? ...
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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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Geneve Tunnel not working over IPsec encrypted IPv6 connection

I've created a tunnel device pair of type geneve on two nodes connected via IPv6. As long as the connection is "plain" the tunnel works well. nodeA tun ip4/6 <-> nodeA eth ip6 <- -> nodeB ...
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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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IPv6 on Alpine VM setup scripts

I am using setup-interfaces eth0 to easily configure the ipv4 address. How I can include ipv6 on it? Or any way to include it? I only found in documentation that I could do it manually editing /etc/...
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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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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
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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
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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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83 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
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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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How to disable IPv6 in Debian when sysctl.conf and GRUB_CMDLINE_LINUX doesn't work?

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
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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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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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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
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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
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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
396 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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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
257 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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How to let KDE Neon 5.13.2 get IPv6 address automatically?

I need to use sudo dhclient -6 to get global IPv6 address manually every time I boot. Is there any way to let KDE Neon 5.13.2 fetch global IPv6 address automatically?
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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
330 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 ...
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1answer
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How to limit SSH access to specific IPv6 address with iptables?

I have the following two rules applied for ipv4: -A INPUT -s 5.70.139.172/32 -p tcp -m tcp --dport 22 -j ACCEPT -A INPUT -p tcp -m tcp --dport 22 -j REJECT --reject-with icmp-port-unreachable The ...
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1answer
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Generate a list of IPv6 into an array

I wrote this script a little while ago : #!/bin/bash #Default number of IPs NUM_IPS=48 if [ "$1" != "" ]; then NUM_IPS=$1 fi #Example of IPv6 supplied 2001:41d0:0303:6e1b::/64 read -p "...
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1answer
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What are these two IPv6 addresses on my Fedora 28 system?

My home machine has two IPv6 address, that look like this (obfuscated for security sake): 2: enp1s0 inet6 2500:1600:4650:bc59::49/128 scope global dynamic noprefixroute \ valid_lft ...
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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 ...
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1answer
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How to get Pi-Hole to work with IPv6?

At home I have installed Pi-Hole on a Fedora 28 machine, and it is now working properly serving IPv4 addresses via DHCP, acting as the DNS server, and blocking IPv4 addresses as appropriate. However, ...
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1answer
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ipv6 router push routes

in my lab i am in need of an IPv6 router that will play the role of the ISP. That ISP router will not be connected to the outside world and it is only to simulate a few things. That ISP router will ...
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Ubuntu pinging from link-local address instead of global

I have a network like this, (client 2001:10:1:100:0/64) -> router -> (server 2001:172:16:200:0/64) However, when I ping from client to the 172.16.200.0 network, (or anywhere) it always uses the link ...
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1answer
771 views

How to disable ip6 lookups in unbound?

I attempted to disable IPv6 lookups in unbound through these options: do-ip6: no prefer-ip6: no Really prefer-ip6 should only take effect when do-ip6 is yes. In any case, I use tcpdump to dump the ...
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48 views

Mirror udp traffic for IPv6

I have four Virtual Machines: A, B, C, D. Machines connected by the following way through the Internal Network of Virtual Box A <-> C, B <-> C, D <-> C Machine C - central node ...
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271 views

IPv6 forwarding doesn't work

I have three Virtual Machines: A, B, C. Machine A and Machine C connected to each other through the B. Their config: A's IP: 2000::ffff:50a:b0b/120 C's IP: 2000::ffff:50a:d0d/120 Machine B has ...
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DHCPv6 equivalent of `dhcping`?

As part of deploying and testing DHCP infrastructure, utilities like dhcping which can simulate a DHCP handshake are very handy to have. Unfortunately, dhcping is IPv4 (DHCP)-only, with no equivalent ...
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ICMPv6 send Multicast Listener Report Message and Neighbor Solicitation

I am configuring ucarp on two on my pc router ie master and slave. Master is turned off and then turned on, recorded in tshark slave application there is icmpv6 multicast listener report message and ...
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ipv6 default route

I have a dhcpv6 server running and working on an access point (wifi dongle on a banana pi on debian). interface=wlx503eaa3d7d6c no-dhcp-interface=lo, eth0 port = 0 enable-ra dhcp-range=fd00:cafe:cafe:...
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Disable DHCPv6 while not disabling SLAAC in network manager

I have two ipv6 addresses, one is from DHCPv6 (/128) and one from slaac (/64), with nmcli connection modify iface ipv6.method "auto" nmcli connection modify iface ipv6.addr-gen-mode "eui64" ...
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Certain ipv6 hosts hang on certain machines on the network

I have this annoying issue where some of the machines on my network will hang when looking up connecting to certain IPv6 addresses, in particular the ones from Google (but I've also seen issues with ...
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2answers
357 views

Debian IPv6 routing

I'm need to add gateway from server dashboard page to routing list for accessing IPv6 from internet and I try to do this using ip -6 route add default via <gateway ipv6> but i geted this error ...
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IP6 error message inside LXC container in proxmox

When I try to activate the eth0 network interface inside a LXC container (Fedora 27), the command shows the following error messages: # ifup eth0 /etc/sysconfig/network-scripts/ifup-ipv6: line 56: /...
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What is the proper way to display IPv6 Addresses in /etc/hosts

I've been tasked with writing a document on IPv6 for my colleagues to learn how to configure IPv6 addresses on our hosts. We primarily use RHEL6.x/7.x, ESXi, and Ubuntu Server. This only pertains to ...