Questions tagged [ipv6]

IPv6 is the successor to IPv4. Rather than 2^32 addresses (like IPv4), it has 2^128, which is 340,282,366,920,938,463,463,374,607,431,768,211,456 unique addresses (34 undecillion). IPv6 addressing is quite different to IPv4 and is not backwards compatible, but protocols that sit on top (HTTP, SSH, etc) remain unchanged.

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linux ipv6 bridge address does not work when mac address is forced

While playing with linux bridging and ipv6 on ubuntu focal, I met an issue that I would like to understand. When I manually set the bridge mac address, bridge ipv6 address is not working anymore, why ?...
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Website cannot be accessed from an outside network despite ports 80 and 443 being open [closed]

I am home-hosting an Express server on my computer, mainly for developing, but also to have fun with my friend. A few days ago, my ISP changed my static IPv4 address which I had for ~3 years to a ...
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RDP to VPN client disconnects

I'm connecting on a local home network from PC1 to PC2 via RDP. Both are running Win10. PC2 then connects via VPN to an external network. However, as soon as the VPN connection is established, the RDP ...
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route ipv4 to ipv6 as mechanism to overcome not owning an ipv4 block for load balancing purposes on premise k8s (none aws/gcp)

This is not a question about tunnelling, although that may be part of a solution. With public cloud providers it's trivial to request a load balancer due to providers owning large class A/B/C public ...
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How to route IPv6 across ports in Cisco ISR

I have a Cisco ISR router with 4 ports. We own our IPv4 addresses and handle them via BGP, but my datacenter provider assigned us a IPv6 network. I've successfully added the IPv6 network to ...
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custom ports in google load balancer for IPv6

I am running an MQTT (on custom port) server on the google compute engine. I need it to run on IPv6 network. After looking at the google docs (https://cloud.google.com/load-balancing/docs/ipv6) I ...
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Forcing the wlan0 interface to send the router solicitation message

I have a small linux system which connects to the wifi router via wireless network. I am trying to enable ipv6 on wlan0 interface. Using SLAAC. Everything is working fine except that whenever I ...
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Server DHCPv6 with Linux Alpine

I want create a server dhcp6 with alpine I'm using Kea-dhcp6. The my file config this is: { # DHCPv6 configuration starts on the next line "Dhcp6": { # First we set up global values &...
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ND Packets get dropped by a router in Packet tracer

I created a simple ipv6 network in packet tracer. I need it for my school project and my problem is, that I have 2 routers: 1 ISP Router with a static IPv6 address and 1 school router that provides an ...
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Inside of my Linux server I can't ping out to IPv6 URLs

Inside of my Linux server I can't ping out to IPv6 URLS. Pinging IPv4 works as expected. For example: $ ping6 google.com I get one line of output and then it sits indefinitely, PING google.com(...
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Q: Configuring dnsmasq to filter A or AAAA queries

Can I configure dnsmasq to respond to either ipv4(A) or ipv6(AAAA) queries only? I am using dnsmasq to forward queries from an internal subnet to a WAN connection. Unfortunately, sometimes I will only ...
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IPv6 configuration on Debian with /48 subnet and PtP address?

(I've asked this question before at https://networkengineering.stackexchange.com/questions/72842/ipv6-configuration-on-debian-with-48-subnet-and-ptp-address but it got closed as off-topic and I was ...
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fail2ban: whitelist IPv6 address

I need to whitelist an ipv6 address in fail2ban, however when I just add them to the ignoreip statement in my jail.conf they get blocked anyways. This is what I have in /etc/fail2ban/jail.conf [...
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DNS SOA record - MNAME is empty (just a zero byte)

Short Question Is an empty MNAME valid at all? Can it ultimately impact clients, like Windows PCs or smartphones? My situation I'm debugging an issue where resolving a host name in an Android app ...
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ipv6 and iptables - setting up basic rules

I have come to realise my IPv6 ports are not going through iptables, and thus are accessible for attacks. I haven't seen any yet, but I'm sure its only a matter of time. As such, I'm trying to shore ...
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Make Docker listen to the IPv6 address of server, forward IPv6 requests to right container

My server is running on both IPv4 and IPv6. Docker is running on (local) IPv4 addresses (ie 192.168.100.1/24). I did not enable IPv6 inside daemon.json as I understand that to be rather buggy and ...
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IPv6 support makes openconnect server vpn connection too slow

I have set up an OpenConnect server (ocserv) on CentOS 8 that is quite fast. However, when I enable IPv6 on it by uncommenting the following line, it becomes painfully slow and upload becomes almost ...
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Redhat 7 - IPv6 does not configure correctly on server bootup, only after resetting interface

we have some RedHat 5 servers which are running IPv4 and IPv6. We are migrating to RedHat 7 and using a similar ifcfg file. When the RedHat7 comes up after a reboot, all of the IPv4 IP's are ok but ...
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IPv6 iptables/nftables multi-wan NETMAP can't access internal hosts from WAN2, WAN3

I have an ip6tables router with 3 WANs, each supporting IPv6. For some reason incoming connections only work for the default route, not ISPs #2 and #3. For example, I can ping the translated IP for ...
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IPv6 Protocol failure

I am having a weird issue with IPv6 in my Windows Server 2019 Domain Controller. I was trying to configure IPv6 for the domain, I've typed some commands as below, when I restarted the server it doesn'...
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How to tag IPv4 and IPv6 packets with different VLAN tags on a Linux box?

I want to tag incoming IPv4 and IPv6 packets from a dual stack enabled connection with different VLAN tags, e.g. IPv4 packets should go to VLAN4 and IPv6 packets should go to VLAN6. To be more general,...
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No Router Advertisement from router after sending Router Solicitation from Linux

Have a Debian 10 Linux and ZTE ZXR10 5960 L3 switch as a router on the network. The problem is that Linux send Router Solicitation (RS) packet without "Source link-layer address" as ICMPv6 ...
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ping returns IPV6 address on ubuntu 20.04

I have installed GitLab on a cloud VM and shortly after stood up a second VM as a postfix server with the same provider (Hetzner) I first noticed a problem when I went back to the GitLab server to ...
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ifdown prints RTNETLINK errors

I configured IPv6 on my Debian VPS. Here's snippet from /etc/network/interfaces: iface ens3 inet6 static address 2a04:52c1:101:680:bb9:8e06:be88:4d43/64 gateway 2a04:52c1:101::1 ...
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Don't accept RDNSS from router announcements in Linux

I have an Ubuntu 20.04 router that uses its own IP as DNS server obtained from router announcements, creating DNS loops. I can't figure out how to ignore RDNSS (recursive DNS server) from router ...
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Is it possible to check that given IPv4 and IPv6 belong to the same NIC?

Given an IPv4 and an IPv6 address of a machine and only access to the public services it provides, is it possible to check that they are assigned to the same network interface controller? Assume the ...
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How to view IPv6 leases assigned by isc-dhcp-server through dhcpd6.leases?

Is there a command or utility to view IPv6 leases assigned by isc-dhcp-server? I know of several utilities for IPv4 such as dhcp-lease-list or the web-based glass, but none work for IPv6. Any ...
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How to register SLAAC hosts in dnsmasq for host resolution?

On my network, hosts receive IPv6 information through SLAAC (radvd). The RDNSS server is specified as follows, and runs dnsmasq RDNSS fd8a:9ae9:9afc:fa2::1 { }; Is there a way to have hosts ...
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Working example of IPv6 NPTv6 ip6tables routing with dynamic WAN address (/128 and /56) to LAN

I am currently using iptables for my home lab router and would like to add IPv6. I have 2 ISPs. My first ISP assigns a /128 to the interface and the ability to request /56. ISP1 is connected to eno1. ...
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Ubuntu IPv6 route not work on multiple interfaces

I'm using multiple router but only default interface has IPv6 connection. I can make multi interface work on IPv4 by command as this guide: https://lartc.org/howto/lartc.rpdb.html ip route add default ...
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Configure postfix to send via IPV4 but receive using both IPV4 & IPV6?

Is it possible to configure postfix to send via IPV4 only but receive using both IPV4 & IPV6? My server, running on AWS Lightsail, now can have an IPV6 address. The address is relatively static (...
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Calling IPv4-mapped IPv6 address to connect IPv4 service on Windows, UDP

I can't make it through - on Windows - by having an IPv6 UDP socket that is to send to the address ::FFFF:127.0.0.1:5000 in order to contact a listening UDP socket bound as IPv4 127.0.0.1:5000. I ...
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how to assign ipv6 addresses to an interface behand a netfilter firewall

I need some advice on how to configure my system so that it can assign some of the /64 bock of ipv6 addresses provided by our ISP to devices which are behind a netfiler (iptables) firewall. Our ISP ...
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Are there issues if you run a IPv6 private network with IPv4 values and an empty prefix?

So i recently found out that the last 32 bits of an IPv6 can be addressed by their decimal value (not universally, busybox ping doesn't). So your IPv4 network is 10.0.0.0/8 and your IPv6 is ::10.0.0.0/...
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How to slice a /56 prefix into a /64 one and assign IPs to intefaces with systemd-networkd (only) and DHCPv6-PD?

I know people do use mixtures of tools (radvd, dhclient, dibbler, dhcpd, etc.). I am provided with a /56 IPv6 slice. SLAAC is not available, just PD/RA. I just want to know how to get a routable, ...
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OpenWrt allow IPv6 rule to access a server with global IPv6 on local area

First of all, I have a domain with dns configured to point to my device global address witch is set to static with my ISP gloabl prefix as xxxx:xxxx:xxxx:de01::3/64 in dhcpcd.conf. I'm using Openwrt ...
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ip6tables-restore on Debian upgrade: `RULE_APPEND failed (Invalid argument)`

On running the command ip6tables-restore < /etc/iptables/rules.v6 on the Debian server, I get ip6tables-restore v1.8.2 (nf_tables): line 48: RULE_APPEND failed (Invalid argument): rule in chain ...
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Segmenting IPv6 networks using dnsmasq?

I have a bit of a complicated network setup(*) where a WAN router connects to the upstream provider and provides an "external LAN" (where actually I have some services) and another local ...
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How to prefer LAN range IPv6 addresses?

My router assigns each device two IPv6 addresses, one global from the 2001::/16 range and a local address from fd00::/16 and resolves hostnames to these IPs, i.e., a globally routable IPv6, a private ...
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How to identify all IPv6 addresses for a user

I’m starting to feel crazy because I’ve googled this 20 different ways and nothing comes up. I have a site that occasionally needs to block users by IP address in order to prevent abuse. With IPv4 ...
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124 views

Synthesize A records when only having AAAA [closed]

I'm hosting some things from my home network and my ISP doesn't provide me with an IPv4 address. Not with a way to port forward to it anyway. I've got my servers running using IPv6 and everything ...
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How to configure subnets/VLANs to restrict access to WAN/other VLANs?

I manage the networking for our (very!) small church as a volunteer. Currently everything is set up on a single /24 IPv4 subnet. I'm wanting to break these out into VLANs for increased security, and ...
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Is it safe to disable IPv6 on my Debian server?

My server hosts 2 different websites which lately have been slow to load on browsers. After looking at potential causes and solutions online, I came across this thread. One of the advised solutions ...
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1answer
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Azure: Difference between IPv4 and IPv6 single IPs versus bundle

I want to assign public IPs to my services (IPv4 and IPv6 are needed) but I can choose to either: Assign a dedicated IPv4 Address Assign a dedicated IPv6 Address Assign a bundle - of an IPv4 and IPv6 ...
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osx ipv6 default routing

I've got an imac that's been running static ipv6 for years; I'm working on deploying ipv6 out to customers, and have the lan side of a test router plugged into a usb ethernet interface on the imac, ...
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CentOS disable IPv6 SLAAC EUI-64 Address Generation

While manually assigning a static IPv6 address on CentOS release 7.9.2009 works. I noticed that another (second) IPv6 address is being generated the so called EUI-64 containing ff::fe in the middle of ...
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IPv6 unicast traffic proxying (with proxy_ndp) under Linux

Precondition: Host machine (Linux version 3.4.11) and connected two devices to this host. Devices should stay isolated (they are connected to the host's wifi). Hardware acceleration is turned off (...
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How to get a proper prefix length from DHCPv6 server?

I have two virtual machines with Ubuntu Server 20.04. One of these virtual machines is a DHCPv6 server, and the other one is a client. I am able to set an IPv6 address on the client, but I cannot ping ...
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iptables not blocking only IPv6 IP's on Ubuntu 20.04 with iptables-persistent, IPv4 OK

I have Ubuntu 20.04 VPS (LEMP) and installed iptables-persistent. In this server, I have installed fail2ban and configured with CloudFlare to ban fail2ban banned IP's. Also, I use the CSF. I use a ...
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112 views

Is it possible to have both static and dynamic IPv6 addresses on one interface?

I have two Qemu virtual machines with Ubuntu Server. I would like one of them to be a DHCP server. On the second one, I would like to have two IPv6 addresses. One should be static, and the other one ...

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