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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How to add static IPv6 in Oracle cloud

I am running OS Ubuntu 18.4. I will add static ipv6 address with netplan in Oracle cloud my netplan yaml file looks like this: network: version: 2 renderer: networkd ethernets: enp0s3: ...
Myra Sewitz's user avatar
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Configuring IPv6 to expose local device(s) to the internet

I am trying to expose a local client to the net to host a website. I am struggling to understand IPv6. Current setup: ISP --> bridged ISP router --> TP-Link router --> LAN I've configured ...
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3 votes
2 answers
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How should I configure properly my LAN to use IPv6 for communication on LAN and WAN?

I would like to use IPv6 on my LAN and would like to be able to go out to the WAN as well. My network is a classic IPv4 environment. It works well. My ISP provides Global Unicast IPv6 address on the ...
supi007's user avatar
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azure linux has not default ipv6 route

Environment VM: Linux Debian 10.10 Virtual Network with ipv4 and ipv6 address space and subnets Public ipv4 address and public ipv6 address (standard SKU) VM NIC associate public ipv4 and public ipv6 ...
comphilip's user avatar
  • 121
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Routes in route6-eth0 don't apply [closed]

I made a file /etc/sysconfig/network-scripts/route6-eth0 with the following contents: default dev eth0 src ****:****::**** metric 50 pref medium However, it doesn't show up when I execute ip -6 route:...
Bas's user avatar
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How can i bind a network interface to an entire /48 subnet of IPv6 addresses without having to enumerate each and every individual address?

Context I need to know how to setup an entirely /48 IPv6 block in my server to perform outgoing requests with any of these IPv6 addresses without setting up each one individually. My ISP provides this ...
João Scheuermann's user avatar
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1 answer
610 views

Apache2 in docker using IPv6

I'm trying to configure IPv6 on my docker container. I want to expose port 80 on my IPv6. But my website still not working on IPv6. How to check where is the problem? Maybe someone can find it in my ...
Nostradamus's user avatar
1 vote
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Are their public IP ranges which don't belong to any country?

I've been working on project and we use IP geo-location using an API to identify user's country. The legacy code has an edge case when there is no country information for a particular IP. I have been ...
CodePanda's user avatar
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2 answers
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Check_mk agent listening on ipv6, how to change to ipv4

Hi I am new to check_mk and not very good in linux server configuration at all, so thanks for your patience. I installed check_mk under debian via gdebi (systemd not xinetd - and used default ...
helle's user avatar
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What's necessary for a bare metal dual stack kubernetes setup?

We are about to start setting up a new kubernetes cluster on bare metal at our own datacenter. The documentation for the k8s moduls and services is great, however I was not able to find any ...
Daniel Becker's user avatar
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BIND9 not getting queries over IPv6

I'm testing the upgrade of a Debian 10 server to Debian 11. The server runs bind9 as a primary authoritative DNS for a number of domains and on Debian 10 has been working fine for two years. (BIND v.9....
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How to blacklist the "prefix" of IPv6

With IPv4 it is pretty easy to blacklist IPs since it's not cheap to get new IPs and they are limited. However, with IPv6 it's pretty easy/free to generate a huge amount of unique IPs and it's pretty ...
Dani's user avatar
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1 answer
211 views

How to better understand IPv6 to block requests

With IPv4, whenever I realize any strange requests coming to my server I can easily block the IPv4 from further requests (I can block on my iptablets, or in my .htaccess file...). However with IPv6 it'...
Dani's user avatar
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Binding to random IP from IPv6 subnet (/64) doesn't work

I got a scaleway.com server (DEV1-S) which offers me a /64 IPv6 subnet. I want to use an IP from this subnet to make a HTTP request (will use wget in the examples) but I can't get it to work. The ...
003random's user avatar
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447 views

Windows DNS64 Server

As detailed on the MS Q&A site I have trouble implementing DNS64 on my Windows 2019 domain controllers / DNS servers. The PowerShell CmdLets run fine, but they don't do anything, I ran Set-...
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Simple NAT64 with Jool and Debian 11

How does one simply enable NAT64 on a Debian 11 system?
OttoEisen's user avatar
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Choice of NAT64 prefix

I'm about to deploy NAT64 and I noticed that it's possible to use your own prefix instead of the "well-known prefix". Now I can imagine complex scenarios with multiple NAT64 gateways serving ...
OttoEisen's user avatar
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3 votes
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Why not shorten a single :0000: field in IPv6

rfc5952, section 4.2.2 "Handling One 16-Bit 0 Field" goes: The symbol "::" must not be used to shorten just one 16-bit 0 field. For example, the representation 2001:db8:0:1:1:1:1:...
Melissa Boiko's user avatar
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1 answer
2k views

NAT64 on Debian

Update 2: I wrote a quick&dirty tutorial for Jool on Debian 11, since their website is very thorough, but also slightly confusing and the examples too complex for most cases. I'm looking to go ...
OttoEisen's user avatar
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2 votes
1 answer
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All Outbound Traffic Uses IPV6

I have a Debian 10 server which has postfix installed, each time I try to send outbound mail traffic, the server uses IPV6 over IPV4. This causes postfix to log Connection timed out. I have tried ...
Ruby's user avatar
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Windows firewall ipv6 loopback issue

I received it on my windows firewall log: DROP TCP ::1 ::1 53264 47001 I tried to add ipv6 ::1 or any other ipv6 loopback address to the firewall rule but received only the message below: An ...
Andro Leo's user avatar
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IPv6 DHCP PD reply going to FORWARD rule in iptables firewall?

On my Fedora 34 Linux firewall/router box I noticed that IPV6 DHCP PD requests are sent out fine. that IPV6 DHCP PD replies do arrive on the wire that the firewall kernel for some reason sends the ...
udovdh's user avatar
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1 answer
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GCP IPv6 communication within a network?

I have a VPC setup with several hosts that need to communicate via IPv6 services. Each of these instances are configured with IPv6 and can successfully ping and connect to external hosts using IPv6. I ...
sirkus7's user avatar
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0 answers
299 views

IPv6 connection drops after renewing an address

I have a router running OpenWrt and a machine with embedded Linux built with Yocto. I need to detect lease renewing in my C application. On my router I decrease lease time to 30 seconds. When I log on ...
tom654321's user avatar
-1 votes
1 answer
172 views

What is default IPv6 configuration on routers

I've just started learning IPv6. I have a router running OpenWrt and I would like to configure it to use IPv6. As I know this address can be assigning to a client with or without DHCPv6 server. Do you ...
tomi7654's user avatar
1 vote
1 answer
645 views

GCP Firewall and IPv6 address support?

Although the GCP documentation claims that IPv6 addresses are supported when making firewall rules (https://cloud.google.com/vpc/docs/firewalls) I can't seem to make it happen. From this doc: ...
sirkus7's user avatar
  • 85
4 votes
1 answer
2k views

GCP, basic IPv6 set up for Linux VM Instance

I'm trying to set up a simple VM in Google Cloud Platform that can ping ipv6.google.com successfully. I'm using these GCP docs regarding IPv6 support, including : https://cloud.google.com/vpc/docs/...
sirkus7's user avatar
  • 85
0 votes
3 answers
1k views

Does mail dot com have IPV6 MX?

It seems mail dot com does not have an ipv6 smtp server. It is a little weird for such a famous email service provider. Or, I did not find a way to get its ipv6 server? I used the following command to ...
William's user avatar
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1 answer
931 views

Cascading IPv6 routers

I would like to accomplish this setup: Internet - (A) - (B) - (Network) Router A has a public IPv6 address: A_EXT 2a02:511:2c00:111:209:50:118:1/48 I have assigned: A_INT 2a02:511:2c00:111::1/64 B_EXT ...
Gema's user avatar
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0 answers
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Monitoring IPv6 connection via auditd

some time i was interested in monitoring TCP/UDP connections with detailed information about process that initiated connection I'have found helpful article about that - Finding short-lived TCP ...
Bormental's user avatar
4 votes
1 answer
2k views

systemd network ipv6 gateway is not set up

Cross posted on github I don't understand why my systemd network config doesn't set up ipv6 gateway route, XXX.XXX.XXX.XXX and YYYY:YYYY:YYYY:YYYY:: are always the same ip. My server is hosted by OVH: ...
Stargateur's user avatar
0 votes
0 answers
685 views

How to set rDNS record for ipv6 address block?

Occasionally, I open a ticket at my VPS provider to let them create a rDNS record for me. Sometimes, I can find a page in my control panel to add the rDNS record myself. This is simple for ipv4 ...
William's user avatar
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1 vote
1 answer
810 views

Can I have two DHCP servers for IPv4/IPv6?

I have an IPv6 block, However the network is based on an IPv4 only router. I can't change that router for several reasons. Can I have a DHCPv6 server with DHCPv4 server? Or do I have to disable DHCPv4 ...
Hoto Cocoa's user avatar
2 votes
1 answer
1k views

nginx listening on ipv6, but for some reason websites won't load

I'm trying to get ipv6 working on nginx (nginx/1.19.6) for SSL. In my domain configs I have: server { listen 93.93.135.169:443 http2; listen [::]:443 http2; server_name backups....
Andrew Newby's user avatar
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3 votes
2 answers
2k views

How can DHCPv6 server allocate fixed IPv6 addresses to clients if it's not allowed to interpret DUID?

According to RFC3315: Each DHCP client and server has a DUID. DHCP servers use DUIDs to identify clients for the selection of configuration parameters and in the association of IAs with clients. DHCP ...
SF.express's user avatar
1 vote
0 answers
394 views

IPv6 multipath routing with configurable weight

With Linux kernel 4.14, when I add IPv6 multipath routes with weights (10 & 30), they are getting added with same weight '1'. IPv4 route does not have this issue. I checked with exact same steps ...
m.divya.mohan's user avatar
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0 answers
2k views

How to whitelist ipv6 in .htaccess to allow website access

I've got an online web tool and I want to give access to a company. At the moment, access is controlled by IP via the .htaccess file. The company I want to give access to are on an ipv6 address and ...
AutoBaker's user avatar
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2 votes
0 answers
145 views

Where can I find ipv6 blacklists [duplicate]

We have blacklists in place to stop traffic from known bad actors. There are plenty of resources such as the lists below but I am not finding any results for ipv6 blacklists. Does anyone know where I ...
Dovid Bender's user avatar
1 vote
1 answer
5k views

Can't PING domains with ipv6 address

All of a sudden, I can't ping domains with an IPv6 Address. I'm running this command: ping google.com But I don't see anything returned ... it just returns this: PING google.com(iad30s15-in-x0e....
Alex Douglas's user avatar
2 votes
3 answers
455 views

How do I visit ipv4 addresses (not domain) from an ipv6-only network?

I got an ipv6-only server and I want to visit ipv4 addresses like 8.8.8.8 with it. I know that I can visit ipv4-only website through DNS64 and NAT64. However, if the destination is just an ipv4 ...
xyz257's user avatar
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0 votes
1 answer
688 views

Bridge not forwarding the neighbor advertisement

I have a bridge created using libvirt and two VMs. I can ping both VMs using ipv4. However, when pinging using ipv6 addresses, it does not work. I can see the neighbor solicitation leaving VM1 and ...
mosquetero's user avatar
0 votes
1 answer
2k views

Using DNSMasq, how do I provide a single static route for an IPv6 network?

Assuming I am running two Dual stack IPv4/IPv6 networks: Network 1: Internet connected IPv4 - 192.0.2.0/24 provides a default route via 192.0.2.1 IPv6 - 2001:db8::0/64 provides a default route via ...
JonTheNiceGuy's user avatar
0 votes
1 answer
644 views

k8s loadbalancer service with externalTrafficPolicy=local passes through client ip on IPv4, hides it on IPv6

I'm having trouble getting a kubernetes IPv6 SingleStack LoadBalancer service passing through the correct source IP address to pods. It works fine on a sister IPv4 SingleStack LoadBalancer that passes ...
growse's user avatar
  • 8,050
3 votes
2 answers
4k views

IPv6 network for WireGuard VPN

I am currently migrating a company-internal VPN from OpenVPN to WireGuard. While at it, I want to migrate it from IPv4 to IPv6. The infrastructure currently consists of one server and ~1200 clients ...
Richard Neumann's user avatar
0 votes
1 answer
1k views

SSRS 2019 not listening on IPv4 Ports, only iPv6

We installed SSRS 2019 on a Windows Server 2016 without any problems and configured it to use URLs with port 80. Accessing those URLs (Service and Portal) via local browser works fine, but trying to ...
tmoe's user avatar
  • 103
4 votes
0 answers
1k views

Enable IPv6 IP forwarding on Windows by default

I'm running Wireguard on a Windows server, connected to multiple peers. Peer A <-> Server <-> Peer B In order to allow peers to ping each other (Peer A wants to reach Peer B), IP routing/...
Adrian's user avatar
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0 votes
1 answer
157 views

How does a node differentiate between an IPv4 and IPv6 datagram? [closed]

In a computer network, how do hosts and routers tell if a datagram is IPv4 or IPv6? Do they just look at the version number field of the packet header?
Newbie123's user avatar
1 vote
2 answers
1k views

pfSense IPv6 routing issues

I'm struggeling to get my pfSense appliance to route the IPv6 traffic from LAN to WAN. My public network is AA:BB:CC:/48 with the provider's router having AA:BB:CC::FF01:1001 Assigning the WAN ...
GTeley's user avatar
  • 21
0 votes
0 answers
211 views

iptables -> ip6tables (convert)

I have the following iptables (ipv4) and need the same on ip6tables (ipv6) for an openVPN-Server: # Flushing all rules iptables -F FORWARD iptables -F INPUT iptables -F OUTPUT iptables -X # Setting ...
Omexlu's user avatar
  • 143
1 vote
1 answer
2k views

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 ?...
Chaoxiang N's user avatar
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