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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sysctl disable_ipv6 value gets modified during bootup. How to find out who is modifying it

In /etc/sysctl.conf I have setting net.ipv6.conf.eth0.disable_ipv6=1. I can see after during init.d calling sysctl the value is set. Confirmed by reading sysctl net.ipv6.conf.eth0.disable_ipv6 to a ...
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Dual boot Linux Mint + Windows 10, IPV6 is not visible online after starting Mint

I have installed Linux Mint 20 alongside Windows 10. I have a internet cable connected to the PC. When I launch Linux, the Network Manager is correctly showing my IPv6, however when I go to http://...
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generate ipv6 address based on mac address

I'm all over the internet right now, and still i have not found an appropriate answer. How can i configure my network to generate the ipv6 address, based on the mac address of the device? How can I ...
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CentOS 8 flooding of ICMP6, router solicitation messages

I am deploying openstack on centOS 8.2 and at one point i need to create veth pair between br-lbaas and br-vlan using VLAN 62 which i am using following script to to that. #!/bin/bash VLAN_ID=62 # ...
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Using network namespaces in production?

I have been looking at two pages https://gist.github.com/dpino/6743226422594b6c02c7150b6e5e7df7 (no nat) and https://gist.github.com/dpino/76b0bf7f522bd0d2e442eca06ae9db76 (nat but I don't know what ...
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Debian static IPv6 address, RA & DNS issues

I try to configure static IPv6 on my Debian Stretch machine (RaspberryPi with Pi Hole) but I have various issues I cannot handle. My dhcpcd.conf file : # Generate SLAAC address using the Hardware ...
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Configuring Debian Buster (10) for IPv6 with DHCP

I had a Debian Jessie server instance hosted by a provider. This instance had its IPv6 an IPv4 address defined statically. I upgraded my server to Debian Buster, and its IPv4 address is defined by ...
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Assign IPv6 multicast group manually?

Is there a way to manually assign an IPv6 multicast group id to hosts? I would like to reach certain (SLAAC configured) hosts via Unicast Prefix Based Multicast Adresses. I am using ubuntu 16.
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How to know an IPv6 address is configured stateful/stateless under Linux?

On macOS, I can rely on IN6_IFF_AUTOCONF (SLAAC) and IN6_IFF_DYNAMIC (DHCPv6). https://opensource.apple.com/source/xnu/xnu-4570.41.2/bsd/netinet6/in6_var.h.auto.html On Windows, I have ...
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Configuring IPv6 on FreeBSD 12

I have configured my FreeBSD 12 system to use DHCP, but DNS resolution does not appear to be working for IPv6 (e.g., when I run ping6 or traceroute6). /etc/rc.conf (relevant lines) ifconfig_em0="...
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Why does ifup seemingly ignore sysctl settings?

On a new CentOS 7 system, I'm trying to disable ipv6. I've added the following to /etc/sysctl.conf to do so: net.ipv6.conf.all.disable_ipv6 = 1 net.ipv6.conf.default.disable_ipv6 = 1 On boot, the ...
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dnsmasq-dhcp server requesting its own lease despite static IPv4 and IPv6 addresses?

I have a server, configured with static IPv4 and IPv6 addresses, running dnsmasq-dhcp. Despite these static addresses, I still see the following errors, referring to itself, in its own logs: dnsmasq-...
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IPv6 source address selection by ip rule and ip route

I am trying to setup a Linux firewall and VPN setup to allow a host to talk over WIFI or a VPN. The firewall on the remote end of the VPN connection will allow packets on the VPN through, but not on ...
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How to enable fragmentation in ipsec tunnel for Ipv6 over ipv4

I have created a tunnel - IPv6 over IPv4 and things work fine. But if i send a large packets say 2000 bytes, it does not get transmitted. Is there something that i need to configure to allow large ...
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Accessing samba server from Windows over IPv6

My server is a CentOS 7 machine running samba-4.10.4-11.el7_8.x86_64 The server is listening on both IPv4 and IPv6 tcp6 0 0 :::445 :::* LISTEN 1332/...
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`dig -4` returns IPv6 address

Why would dig -4 return an IPv6 address? % dig -v DiG 9.16.5 % % dig -4 @8.8.8.8 TXT o-o.myaddr.l.google.com | grep TXT ; <<>> DiG 9.16.5 <<>> -4 @8.8.8.8 TXT o-o.myaddr.l....
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manjaro VBox VM and ipv6

I have a manjaro 20.1 VM running in a Ubuntu 20.04 host. On the host, and on two other Ubuntu machines, and on a Ubuntu VM on one of those hosts the following returns a IPv6 address. It is supposed to ...
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Why is a bridged TAP interface receiving a link local IP address?

I am using libvirt with qemu-kvm on Debian 10 and I have created a virtual machine with bridged network, and it has created a TAP interface named vnet0 which has been added to my bridge. What I don't ...
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How can I disable assigning ULA address for an interface?

How can I disable assigning ULA address for an interface? I am getting prefix from the router, I just need the global v6 address to be assigned to the interface. I dont need ULA. Is there any way I ...
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Ubuntu 20.04 disable temporary IPv6 addresses

I have a very basic Ubuntu 20.04 server installation. I am trying to disable the system from using temporary IPv6 addresses. My netplan is as follows: network: ethernets: ens160: ...
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How to fix network service tentative issue?

On RHEL 7, when config an Ipv6 network, restart it by systemd, got issue IPv6-address to not be tentative. Check its status, it's Active(Existed). But network can be used as normal. Is there a way to ...
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tcpkill for IPv6?

How does one disable an IPv6 TCP connection? It seems like it should be easy. The only solution I found is a new effort that has a lot of potential, but needs to be developed further to be used as a ...
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UFW allow SSH on non-standard port to IPv6 addresses

I want to open my UFW firewall to SSH on port 1234 while denying access to all through port 22. My LAN DNS is resolving to IPv6 addresses and I don't want to change that. I'm having trouble forming ...
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Why do we need to have an ip6tables rule for DHCP6 to work? (by contrast, IPv4 does not require any)

Why do we need to have an ip6tables rule for DHCP6? (IPv4 does not require it by contrast) Here's minimal IPv4 rules written by me, you see no special DHCPv4 (Wikipedia) rule: IPv4: iptables --list-...
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Unable to connect vm to IPv6 internet via virtual tap interface

I'm having trouble connecting a vm to the IPv6 internet through a virtual tap device on the host. I.e., I cannot ping ipv6.google.com or the public IPv6 host global primary interface address. Ex: -...
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Can't ping virtual tap network interface via IPv6 from primary interface (eth0)

I'm having trouble communicating with my virtual tap devices via ipv6. Essentially ping6 -I eth0 <tap interface link-local ipv6 address> doesn't return anything. I can't even ping the host-...
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RegEx to Match *ONLY* IPv6 Global Unicast Addresses (GUA) from logs

There's next to no tools for IPv6 security, so want to roll my own solution which I will later opensource. SO: I need a RegEx to sift through logs for remote IPv6 connections to analyze and process ...
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In IPV6, what should I do if the last 2 boxes only contain 3 characters?

I'm setting up a new router which actually allows me to change both my IPV4 and IPV6 DNS Servers. I'm adding AdGuard DNS for both and setting up the IPV4 was no problem at all since I've done it a ...
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Why does adding an IPv4 address alias to loopback adapters make the entire subnet range pingable but not for IPv6?

For example with IPv4 addresses I can add the alias 172.16.0.0/12 to a loopback adapter: ip addr add 172.16.0.0/12 dev lo and I am then able to ping any address from 172.16.0.1 - 172.31.255.255 ...
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better nftable config for NAT of IPv4 over IPv6 by MAP-E (RFC 7597)

I am configuring nftable (/usr/sbin/nft) for IPv4 over IPv6 tunneling. There are several standards for tunneling IPv4 packets encapsulated in IPv6 packets. One of popular methods is MAP-E (RFC 7597). ...
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curl timeout eight times

Have a line of code that has always worked. curl -sv http://downloads.puppetlabs.com/facter/facter-2.4.4.tar.gz | sudo tar xz; sudo ruby facter*/install.rb Suddenly today, one VM on my host has ...
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nftables dynamic blacklisting both IPv4 and IPv6

In setting up dynamic blacklists for nftables, per A.B.'s excellent answer, I'm encountering an error when duplicating the blacklist for both ipv4 and ipv6. I perform the following command-line ...
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1answer
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IPv6 direct connection

A project (Linux based) I am working on requires an IPv6 only network interface which can be accessable via mDNS when connected to a network or when directly connected to another machine. The ...
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1answer
380 views

How to add an IPv6 address?

The official Debian networking documentation tells to use: ifup 6to4 But ifup is not found (ifupdown and ifupdown2 are commands not found too, even after having been installed). Does it have ...
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How to create peer to peer Ipv6 network using link local addresses?

Can i create a peer to peer network using Ipv6 link local address scope? I should be able to ping from System A to System B's Link local (fe80 address space) and vice versa. In other words I want to ...
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What is ping6: sendto: Permission denied a sign of when debugging?

I'm trying to understand why some IPv6 requests (not all) seem to return permission denied errors when using tools like ping6, traceroute, curl etc. I have a secondary WAN connection configured on a ...
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IPv6 gets disabled automatically

[marvin@thinkpad ~]$ uname -a Linux thinkpad 5.5.16-1-MANJARO #1 SMP PREEMPT Wed Apr 8 10:07:00 UTC 2020 x86_64 GNU/Linux When i freshly boot up my system, ipv6 works. After several hours, it ...
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Network issues after setup a read only file system

I'm new to Linux (Raspbian Buster / Raspberry Pi 4 model B) and I have some network issues after setup a read only file system. I followed this guide to realize the ro fs. My raspberry is connected ...
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Git push/pull taking too long - IPv6 issue

My configuration: laptop: XPS 15 7590 system: Ubuntu 18.04 internet connection: wifi (5 GHz) Every time I run git pull, git push I have to wait like 15 minutes until it is done. Same problem with ...
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How to delete old networking alias with wrong IPv6

I try to ping to my server. Normally I can just go ping foo with foo being the name of the server on the network. I connected the server for a short time via wifi which gave me a second IPv6 for it. ...
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using rlogin with ipv6 address

I am trying to connect to the remote host via rlogin rlogin -l root -p 513 fe80::cccc:1f%eth0 But I am getting the message: kex_exchange_identification: read: Connection reset by peer What should ...
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Create static ipv6 address without 'noprefixroute' using NetworkManager

I have created a static ipv6 address on my firewall (armbian) LAN ethernet. I used NetworkManager. The problem is the address shows as: inet6 2001:DB8:c101:b700::1/64 scope global noprefixroute The ...
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Why does lsof indicate my IPv4 socket is IPv6?

I am looking at the output of lsof -i and I am getting confused! For example, the following connection between my java process and the database shows as IPv6: [me ~] % lsof -P -n -i :2315 -a -p xxxx ...
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Auto Blacklisting in Postfix

I have numerous Postfix directives which successfully limit abuse. HOWEVER: After a restriction is enforced, the abuser just reconnects and goes through the complete process of re-failing the same ...
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Kernel-based IPv6 SLAAC not working?

My ISP's DHCPv6 is broken. As a work around I figured I'd try IPv6 SLAAC since I do see router advertisements coming in on my WAN interface. I believe I've configured accept_ra, accept_ra_pinfo, and ...
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dhcpcd dhcpv6 times out after Router Advertise, never sends a DHCPv6 Request

I use a linux host as an IPv4 router and looked into enabling IPv6 (it's the future, I'm told). I already use dhcpcd as a dhcpv4 client to get an address from my ISP, so I figured I'd use it for ...
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Run script on obtaining custom vendor option in Stateless DHCPv6 client

I am using Ubuntu and this question is regarding DHCPv6. After obtaining RA (router advertisement) with O-bit ("Other configuration" flag) set to 1, an information-request is sent by the client. ...
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IPv6 Doesn't Route Outside Of Libvirt Network

I have VM which has a single interface that itself only has IPv6 available from libvirt's dnsmasq: 2: enp1s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default ...
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Turning off ipv6 in CentOS 7

I am attempting to reduce network traffic. Every time httpd on our CentOS 7 box makes a dns query, I can see that both an A and an AAAA request type hitting our internal dns server. Since we are not ...
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How to connect ipv6 address with ssh?

My local network is simple. sudo ifconfig enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500 inet 192.168.31.52 netmask 255.255.255.0 broadcast 192.168.31.255 inet6 ...

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