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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 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
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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
48 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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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
106 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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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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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
77 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
52 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
179 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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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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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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226 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
239 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
207 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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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
42 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
185 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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21 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
225 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
199 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
56 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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123 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
580 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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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
318 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
76 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
236 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
337 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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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
288 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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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
68 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
105 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
222 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
940 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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243 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
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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
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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
731 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
161 views

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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0answers
137 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 ...
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1answer
6k views

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
52 views

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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0answers
291 views

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
2k 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 ...