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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IPv6 access to site behind OpnSense

I am new to IPv6. I have dedicated server with both IPv4 (single external IP 135.x.y.z) and IPv6 network 2a01:abc:def::/64). Within this server I have few VMs and 2 networks (WAN and LAN). OpnSense ...
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What would cause my IPv6 connectivity to keep dying, with a reboot fixing it each time?

Centos 8 Stream When I first boot my server up, ipv6 works fine. I can ping another ipv6 address without issue. A few (10?) minutes later, it stops working. Rebooting the box fixes it, but I can't ...
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My server has been physically moved to a new rack with a new IP address, and now I'm getting OCSP errors? Could it be an IPv6 thing maybe?

I'm pretty sure SSL certificates are almost always tied to a domain name rather than an IP address. And the vast majority of my traffic is unaffected, generally things are working well. However, my ...
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Centos7 server that has no IPV6 assigned to it, can't read IPV6 ips in access log

I'm using CentOS7, nginx as a reverse proxy and apache web server. This server doesn't have IPv6 assigned to it, therefore there is no IPV6 in the NIC. This server hosts several websites. When I check ...
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Microsoft Remote Desktop on macOS cannot connect over IPv6 by hostname

I have an AWS EC2 instance running Windows 10 with an IPv6 address. I can connect directly to it by specifying the full IP address (like 2001:DB8::1) but get a "Error code: 0x104" when ...
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I have enabled IpV6 only. Why I can still ping 127.0.0.1

I would like to test few scenarios on IpV6 stack. For that reason I have disabled IpV4 stack for each network adapter in network adapter settings (Windows 10). Now, when I run ping 127.0.0.1 - I still ...
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Why IPv6 neighbor solicitation uses multicast instead of unicast address?

I'm on Linux and I want to ping fe80::1234:56ff:fe12:3456%eth0 which is connected to the same Ethernet switch as my eth0 interface. I haven't yet communicated with fe80::1234:56ff:fe12:3456 so I don't ...
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Routing traffic from a bridge to a specific interface

Fundamental question about routing in Ubuntu 20.04. I have a baremetal setup in Hetzner which has an 11.22.33.44/32 IPV4 address along with 2a01:db8:30/64 subnet allocated to it. enp7s0 is the ...
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IPv6 not working on Debian 11 with nftables/nginx

I'm running a webserver (nginx 1.21.6) on a Debian 11 system with nftables 0.9.8. My nftables configuration is: table inet filter { chain input { type filter hook input priority filter; policy drop; ...
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Apache mod_authz_host with dynamic IPv& range

I am running an Apache 2.4 on Debian Bullseye on a LAN behind a DSL router with dynamic IPv4 and IPv6 addresses. My Webserver works as a TLS endpoint and serves a variety of pages. Some of these pages ...
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Routing does not work

I have two interfaces wan0 and wg0. The routing table looks like this: ::1 dev lo proto kernel metric 256 pref medium 2a0c:xxx:yyy:zz00::/56 dev wg0 proto static metric 20 pref medium 2a0c:xxx::/32 ...
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How do I configure IPv6 via WireGuard?

I rented a VDS in order to set up WireGuard VPN on it and distribute all VPN clients /64 IPv6 subnets. From the hosting I originally got the address 2a0c:xxx:yyy::1/32. Here are the configurations of ...
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IPv6 forwarding enabled but not working. How to get it to work?

My system is running Debian GNU/Linux 11 (bullseye) My network is configured with two interfaces, one to my ISP and one to my lan. I am using systemd-networkd to manage the interfaces. The problem is ...
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OpenVPN won't connect to my IPv6 address (write UDP: unknown error code=10051)

I have a problem with my VPN. I have recently gotten an IPv6 address and wanted to use that for OpenVPN. I can connect if I use my IPv4 address instead which makes me think I have probably done ...
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OpenVPN IPv6 address-less tap interface

I am trying to upgrade an openvpn server and I have an issue regarding IPv6 config. I can't figure how to configure a tap interface without an IPv6 address, and still be able to assign IPv6 addresses ...
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Service bound to ipv6 on linux machine - Can I disable IPV6 and access service on my IPV4 address?

I am attempting to install Tableau Server on Ubuntu 18.04 and have the management service running on port 8850. I am unable to access the service at that port on my IPV4 address as it seems to be on ...
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Configuring UniFi USG-3P IPv6 for a webserver

I have the following UniFi based network. For the context of this question, all statements relate to IPv6 connectivity unless otherwise stated. In this setup, the server can access the internet ...
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Do I need to allow ssh v6?

I ran sudo ufw allow from <IPv4> proto tcp to any port 22. But this resulted in allowing ssh in from Anywhere to ssh v6. Which is kinda not what I wanted so I sudo ufw delete <sshv6-rule-...
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How do you add an IPv6 glue record / host name on GoDaddy?

I manage my own nameservers and I have existing IPv4 host names set up on GoDaddy that point to them. They work as expected. I am now adding IPv6 to my nameservers, so I need to add the IPv6 addresses ...
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Prevent automatic Windows DNS from registering global IPv6 addresses

When having IPv6 enabled the automatic Windows DNS registration adds AAAA records for both the ULA and the global unicast address. This is not a problem for most networks, but causes issues when using ...
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Adding IPv6 interface into ifconfig worked but host unreachable when use it

I have VPS run on Ubuntu 20.04, I was asking to Customer Service of my VPS Provider, she said their service (VPS) currently is not supporting IPv6. Since she is not technical support, I believe my VPS ...
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Forward UDP ipv6 port in a VPS to UDP ipv4 port in another VPS

I have VPS let's say VPS X that doesn't have IPv4 but only has IPv6. and I have VPS let's say VPS Y that doesn't have IPv6 but only has IPv4. Since IPv4 is still common used today, and some device ...
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What is the IPv6 equivalent of 127.0.0.1 [duplicate]

The IPv4 address 127.0.0.1 is for the local/current client. What is the opposite of the address in IPv6? I already searched for it, but only found ::1. Is this the correct one?
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NFS mount fails over ipv6 with "Address family for hostname not supported"

NFS fails to mount through /etc/fstab configuration, which is as follows: # NFS_SERVER:/PATH/TO/EXPORTED/DIR /MOUNT_POINT_ON_CLIENT TYPE_OF_FS OPTIONS DUMP PASS [...
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How to route IPv6 to the external interface?

I have purchased a VPS from IONOS. While they provide an IPv6 range 2a00:xxxx:xxxx:67::/64, they don't route it to the VPS itself, which is quite odd. I wonder how I can achieve that. I have only 254 ...
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Cisco ASA IPv6 single ::/64 prefix assignment

I am configuring public IPv6 (dual stack w/static IPv4 block) on an ASA 5506 ver 9.9(2)36. The ISP has assigned a single /64 prefix where 2001:2:3:4::1 (not actual IP) is their equipment and 2001:2:3:...
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Can Microsoft resolve an IPv6 for Exchange Online?

Is there a way to resolve an IPv6 address for Exchange Online like : mydomain.mail.protection.outlook.com? I only got an IPv4 address for the mailserver at mydomain.mail.protection.outlook.com Thanks ...
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Systemd-networkd fails IPv6 autoconfig where ifupdown succeeds

Title is a bit vague, since I do not know what is going on. I want to switch to systemd-networkd, and I want it to autoconfigure both IPv4 and IPv6. I come from ifupdown, with the following config: # ...
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Testing IPv6 gateways/routers inside my network

I am currently using a Linux (Debian) box as my router/gateway and would like to test some other solutions (like VyOS, PFSense, OPNSense...) without replacing it (for now). The testing would happen ...
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Network Security: Hardening IPv6 on Ubuntu Server?

I am familiar with hardening IPv4 on Ubuntu server, but when I use the same rules for IPv6 with ip6tables, the IPv6 connectivity is lost resulting in Destination unreachable: Address unreachable ...
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how to use ipv6 subnet (2302:1400:3010:3731:0:1/96) for outbound connection from linux? [duplicate]

how to use 2302:1400:3010:3731:0:1/96 subnet for outbound connection from linux? I'm trying to use something like this curl --interface 2302:1400:3010:3731:0:1:5fff:8 ifconfig.co in GCP VM this is ...
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postfix: how to force IPv4 through SMTP?

Problem I have successfully set up a Postfix mailserver with an SMTP interface, set up DKIM, DMARC, SPF, all that stuff. But I had a problem when testing the delivery of emails to Gmail. Namely, SPF ...
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ssh Unknown error IPv6 windows10

I need to ssh a device from LAN. I've been able to do so in IPv4 in linux and windows10 but for IPv6, it only worked in linux. ipconfig PC LAN: This is the error I got in windows10: ssh -vvv Admin@...
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Construct public ipv6 adress from hostname of router and interface id of client [closed]

I'm trying to ssh to some client behind a router that has a dynamic IPv6 address. Directly using the public IPv6 address of the client works just fine. Now, I'd like to dynamically construct the IPv6 ...
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IPv6 on ESXi with Hetzner

I'm having trouble with this one since I'm neither good at ESXi or networking so I'm mostly just following tutorials without being very sure about what I'm doing. So I just followed this guide to use ...
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Advertise self as ipv6 dns server, with ra-pd / radvd

I use prefix delegation to set up stateless IPv6 on my local network. On my router, my RADVD setup looks like this: $ cat /etc/radvd.conf interface lan { AdvSendAdvert on; prefix ::/64 { }; ...
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DHCPv6 fixed assigment

Trying to assign fixed ipv6 addresses to my coreos master and worker nodes from my Centos in order to have dual stack running on the cluster. However I am having a hard time getting it to assign the ...
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Site 2 Site VPN with ipv6

I have a Site 2 Site VPN running, based on IPv4. So I have 2 Networks, both connected via a router to the internet. The ISP provides a public IPv4. The 2 networks have the following IPs A: IPs 192.168....
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IPv6 vs IPv4 available subnets - enough or too less

I read a bit about IPv6 and found that usually you get assigned a /48 prefix address. Which gives you 16 bit for subnetting. Reading further assuming that you use /64 subnets you would end up with ...
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ISC Dhcpv6 pool

I recently set up a dhcpv6 server in my network. The problem is: I set the range of it to #VLAN120 subnet6 2001:470:2249:120::/64 { range6 2001:470:2249:120::20 2001:470:2249:120::250; ...
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Unable to add IPV6 Route in GCP

we have a requirement where we need to create a floating Ip and it should be moved across the GCP Compute Instances. In this case we need to add the route under the route table of the VPC(asia-south1) ...
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No IPV6 internet connectivity on client side of OpenVPN AWS EC2 server?

I have an OpenVPN server I've set up on an AWS EC2 instance that is pulling an IPV6 address, and can traceroute6 and ping6 ipv6.google.com. The client can do neither and does not return an address ...
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Which ICMP types (v4/v6) should not be blocked?

I have made a lot of research into this and have found that some references contradict each other. IPV6 For example RFC4890 says the following types should be allowed for optimal functionality: Type ...
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Promote external IPv6 to static?

What's the command for promoting an externally accessible IPv6 range to static within the VPC subnet? My VM is accessible at 64bit wide IPv6 range, within a 96bit IPv6 subnet. But I'm afraid these may ...
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How to send/broadcast ipv6-mac maping cache update request for IPv6 IP

We can update IPv4 neighbors by using arping command. I have used arping -A -I -c <interface_name> <IP_address_of_interface> with success. what is the command to update mapping of IPv6 ...
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Can safely block these ICMPv6 message types on a web server?

I have a Debian 11 VPS on a cloud provider, with both IPv4 and IPv6 enabled and the eth0 interface with both a global-scoped ipv6 address (public) and a link-scoped ipv6 address (fe80::/10). The sole ...
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ipv6 route add with next hop fails

I'm trying to add an ipv6 route on machine B to subnet behind next hop A: 2:2:2::2/64 +---+ 192:168:2::1/64 192:168:2::10/64 +---+ -----| A |---------------------------------------| B | ...
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Netflow records with Destination Ports 1025,257 and Protocol as ipv6-icmp

I have some Netflow records from a bunch of routers. The records contain IPv6 flows and there are entries with protocol as ipv6-icmp and their destination port values as 0, 1025 and 257. I know from ...
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ipv6 distribute an ula prefix without an router

I have a network which has no ipv6 connectivity to the internet. But I'd like to play a little with private networking. So I want to use ULAs for my devices and automatically distribute the prefix. I ...
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Can't chain more than one network namespace together

Problem Statement With the below configuration a veth pair is created between the default/main net namespace and a netns called ns1. The config also creates a second veth pair: veth2 is in netns ns1 ...
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