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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, ...

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Why do I have to add network card name in ipv6 link host address on linux when using php file_get_contents()? [migrated]

I have a question when I try to request an ipv6 link host address on Centos7. Here is my code. var_dump(json_decode(@file_get_contents('http://[fe80::852f:f5c7:15f1:d726]:8080/api/init/info', 0, $...
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30 views

IPv6 - No route to host (113)

I'm trying to connect, in IPv6, two modules (client and server) via a router. It works in IPv4 but not in IPv6. Here is router configuration: $ ifconfig eno1: flags=4163<UP,BROADCAST,RUNNING,...
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1answer
47 views

Ping public ipv6 dns from docker container

The docker container is running on a VPS (ubuntu 18.10). What I am able to do: ping -6 2001:4860:4860::8888 from host machine ping -6 <docker container ipv6 address from host machine ping -6 &...
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26 views

Squid IPv6 To IPV4 mapping

i just finished setting up my squid proxy server, i have lots of IPv6 and only two IPv4 on my interface. the way squid is working currently is to use specified IPv6 tcp_outgoing_address, but if ...
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1answer
45 views

Unable to ssh server via ipv6

First: ipv4 works fine. So I got the following setup: (Server is an Arch Linux OS running as VM) EDIT Added a rule ACCEPT tcp ::/0 ::/0 tcp dpt:22 which ...
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44 views

IPv6 subnets ping ok but no TCP?

I have a short questions. I have 2 IPv6 nodes connected over Layer 2 unmanaged Switch. Node 1's static address: fd53:7cb8:383:101::121/48 Node 2's static address: fd53:7cb8:383:1ff::141/48 ...
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9 views

IPv6 SLAAC support for servers OoB adapters

What is the status of SLAAC support for IBM Integrated Management Module, Dell iDRAC, HP iLO, etc? Or if this is not supported, then is one able to configure IPv6 address manually?
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1answer
53 views

What IPv6 block should be whitelisted when a user asks to whitelist their IP?

Currently, on my IPv4-only service, users can whitelist their IP address which allows them to bypass email 2-factor authentication when they log in. When they do this we only whitelist that single IP ...
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1answer
32 views

Assigning ipv6 addresses for multiple ipv6 only proxies

I'm a bit new to IPV6, so please correct me if I have some horrible misunderstanding somewhere. I have a situation where I want to run multiple ipv6 only proxies on Linux (Ubuntu 18.04 and proxies ...
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29 views

bind9 wilcard exclusion / force ipvX in wildcard environment for specific hosts

Using bind9, there the zone example.com with A and AAAA records for *.example.com. There is an A record for ipv4.example.com and an AAAA record for ipv6.example.com. Since ipv4.example.com has no ...
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18 views

Show delegated ipv6 prefix at command line

I have openwrt/lede running on my routers. With the gui called ”luci“ installed in the overview the delegated ipv6 prefix is displayed. How can I figure out the delegated prefix at the command line?
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Multiple routes from router advertisements

Consider the following simplified setup: All devices are IPv6 enabled. Interfaces are configured in a way that we have 3 networks as shown. Router advertisments are enabled on both routers R1 & ...
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0answers
27 views

RFC 4191 route option not taken into account by Linux host

Context of the configuration In the above configuration: the host want to access Lan 2 using IPv6 configuration the IPv4 configuration is working the stateful DHCPv6 is used everywhere IPv6 ...
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0answers
49 views

IPV6 Small Business Implementation - Windows DHCP/DNS, PFSense, IPV6

I have some confusion about IPV6 on a Small Business Network. I'm sure one part or the other is covered extensively, but I can't seem to find answers. (Background info) I have a home network that ...
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0answers
48 views

How to configure IPv6 subnet on CentOS 7

I have a VPS with 2 IPV6 addresses, 240e:200:xxx1:12::159 and 240e:200:xxx1:12::160,gw 240e:200:xxx1:12::1. Recently I asked for IPv6 support from the administrator, here is what I got respond 240e:...
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0answers
68 views

Linux kernel 4.9 not responding to neighbour solicitation

I have this small network where Linux kernel 4.9 acts as a v6 router. There are two other servers connected to this router and both have ipv6 address configured on interfaces connecting to this router....
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1answer
172 views

Adding a whole IPv6 /64 block to a server using Netplan

I have read Adding a whole IPv6 /64 block to an network interface on debian We want to make use of the AnyIP feature to add a whole IPv6 /64 subnet block to a web hosting server but using Netplan ...
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44 views

Setting up LXD/LXC container with public IPv6 address

My cloud server provider assigns a single IPv4 address and a IPv6 subnet (/64) to each of my cloud servers. I am running Ubuntu 18.04 on my severs with Ubuntu 18.04 LXC containers inside them. Making ...
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2answers
77 views

How to Enable IPV6 on Windows Server 2012 R2 (Cloud Google VPS)

I'm new to Cloud Google VPS. Since it's free, I am testing some Windows Server with 2012 R2 OS, but having a problem enabling IPv6 IP Address. Help would be greatly appreciated!
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1answer
43 views

Postfix IPv6 Relay access denied

I recently set up my postfix server with both ipv4 and ipv6. I am noticing that whenever my other server is sending the emails and it is received by the postfix server on ipv6, it is logging a "Relay ...
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58 views

fail2ban does not add chain to ip6tables

I am using fail2ban-0.10.2 on Ubuntu 18.04. I have the following action configured in fail2ban, called ipset-simple.local: [Init] protover = 4 iptables = iptables -w blocktype = DROP [Init?family=...
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48 views

Is it possible to configure an IPv6 multicast address to a NIC?

Is it possible to configure an address from ff00::/8 address block to a NIC? Looks like it is not possible: # ip a add ff99::1/8 dev p2p1 RTNETLINK answers: Cannot assign requested address # # ip ...
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2answers
663 views

NGINX SSL does not respond over IPv6

On a Debian server with nginx, I get no response from a web server over HTTPS and IPv6. HTTP works fine. netstat reports port 443 listening on the IPv6 address firewall is open, ipv6scanner.com ...
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1answer
3k views

Should my website have an IPv6 address?

My website only has an IPv4 address. With IPv6 being the future, is it possible that some users may not be able to reach the website if it does not have an IPv6 address? Also, does having an IPv4/IPv6 ...
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How to tunnel an IPv6 website through an IPv4 in a VPS? [duplicate]

My ISP will only let me host things in IPv6. I'm hosting an IPv6 http page and need people with IPv4 connection to access it. I have a VPS which can be used to grab the IPv6 page and return as an IPv4 ...
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22 views

Netfilter: force IPv6 client to use another source address

I have a network with two IPv6 subnets: one is a native connectivity and one is a Hurricane Electric 6in4 tunnel. When clients initiate a connection towards the Internet, they usually choose a source ...
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0answers
34 views

docker containers give out blank ipv6 address

I am trying to develop simple swarm service with docker, I am using below docker compose file version: '3.2' services: sessions: image: redis:4 ports: - 6379:6379 ...
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1answer
47 views

Curl does not fall back to ipv4

I have gentoo build with ipv6 and ipv4 configured for localhost /etc/hosts # IPv4 and IPv6 localhost aliases 127.0.0.1 sunils-pc.homenetwork sunils-pc localhost ::1 sunils-pc.homenetwork ...
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0answers
18 views

How to configure ip6 gateway routing with a wildcard

We have a number of devices that need bidirectional traffic with our servers. Each of these devices has an address prefixed by their gateway (they are IoT devices sitting on a local mesh network, ...
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0answers
30 views

Differences between IPV4 to IPV6 transition methods

After some research, I found 3 main methods in order to establish the transition from IPV4 to IPV6, Dual Stack Tunneling Translation Now, I can understand them all and how they work, but very few ...
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2answers
275 views

IPv6 Gateway outside network (OVH)

We a dedicated server at OVH, assigned 2001:41d0:a:72xx::/64 I have set the machines on a segment bridged to the wan, as per IPv6 public routing of virtual machines from host The gateway is 2001:...
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1answer
103 views

IPv6 /56 subnetting to Virtual Machines

My network provider has allocated me a IPv6 /56. My goal is to give a /64 to each virtual machine I have. They told me they would route the /56 to my CentOS Xen server and I would have to handle the ...
0
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1answer
19 views

Two ipv6 tunnels on one host

I have host with additional IP addresses. We will call them as 51.52.53.54 and 71.72.73.74 and two ipv6 tunnels with /48 subnets. Tunnel provider gives example configuration and I configured my first ...
1
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1answer
48 views

Multiple IPv6 routers on the same network

I have two ISPs for my home network. They are connected to two separate routers. If I run radvd and dhcpd on both routers at the same time, I get no IPv6 connectivity. My IPv6 connectivity only works ...
1
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1answer
47 views

How to bind a specific IPv6 address to a specific user?

I'm running a VPS on Debian 9 that has multiple users and /64 Network of IPv6 addresses. I added a few of them by typing ip -6 addr add *IPv6* dev eth0 How do I bind a specific IPv6 address to a ...
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3answers
79 views

How to configure already statically routed IPv6 block on CentOS 7

My question is very simple yet I didn't find a solution, probably because of my lack of networking knowledge. I have a dedicated server and I manipulate it through IPMI remotely. Recently I asked for ...
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1answer
48 views

oVirt qemu-kvm listening on wrong IP

I'm new to oVirt but managed to configure it and take over the console on an IPv4 network, using VNC instead of spice. However, I've noticed that the qemu-kvm process only binds to the IPv4 interface ...
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1answer
101 views

Default IPv6 route keeps disappearing

I've got an dedicated server hosted by KimSufi that's running Ubuntu Server 18.04. While I've goto both an IPv4 address and an IPv6 address, I keep getting random dropouts on IPv6. Doing a ping -6 ...
2
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1answer
58 views

Where to download MariaDB 10.3 over IPv6?

CentOS 7 server with only IPv6. When I try to use, [mariadb] name = MariaDB baseurl = http://yum.mariadb.org/10.3/centos7-amd64 gpgkey=https://yum.mariadb.org/RPM-GPG-KEY-MariaDB gpgcheck=1 It ...
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1answer
52 views

Dual Stack CentOS not preferring IPv6

I'm currently trying to access a computer, over an OpenVPN tunnel, by addressing it on IPv6. I've also registered an A and AAAA record on my private DNS server. On both sides of the tunnel, I want to ...
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1answer
34 views

Multi router network and IPv6 DHCP/RA issues - How to assign default routers?

I've again got problems with our LAN. There are 4 WAN gateways all on the same subnet, all with 100M uplink. On IPv4 I advertise default routers using a ISC DHCP Server. On IPv6 there doesn't seem to ...
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1answer
49 views

Why does ipset succeed on adding ipv4 ranges, but fail on adding ipv6 range?

Using ipset to clean up bulky iptable rulesets does not seem so different between IPv4 and IPv6: # ipset create TEST hash:net family inet # ipset create DEMO hash:net family inet6 # iptables -A INPUT ...
3
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1answer
101 views

How do I enable IPv6 on Fedora 28 on Amazon EC2

I can't seem to get IPv6 working in Fedora 28 in Amazon EC2 (so using cloud-init and DHCPv6). It works in RHEL 7 with the configuration described here. Applying the same configuration to Fedora 28 ...
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1answer
49 views

how can so called “unallocated” IP adresses appear in web logs?

My server is currently experiencing some web app attack to which miscellaneous IPv6 addresses are participating. Several of these addresses are said belonging to so called unallocated networks None ...
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45 views

CentOS 7 Server gets IPv6 suffix, but not prefix

I have a server that I'm pulling my hair out with. After total a reinstall, ipv6 works fine until I reboot the system. After that, it only ever picks up the suffix address: 2: enp1s0: <BROADCAST,...
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1answer
33 views

How to set the Ipv6 vor a domain without subdomain

In my DNS setup, I set a record for * 138.my.ip.here this works for spacetrace.org as for www.spacetrace.org Now I tried the same with an AAAA record for IPv6: * 2a01:4f8:171:27a2:0:77:77:101 ...
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0answers
58 views

Configure multiple static IPv6 addresses with dynamic prefix

is it possible to add multiple IP addresses to an interface where the host part is static and the prefix is dynamically determined from router advertisements? All ressouces I found told me to set a ...
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1answer
89 views

IPv6 Privacy Extensions use_tempaddr=1 vs use_tempaddr=2

I understand privacy extensions and that you enable them by setting use_tempaddr. Unfortunately I haven't found any explantion for the different settings. Every articel I read used either 1 or 2 or ...
2
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0answers
61 views

SuSE: how to get /etc/resolv.conf updated with IPv6 name server?

I have a SuSE 11 Linux VM, it has both ipv4 and ipv6 enabled, the network this VM connecting to supports both v4 and v6. After the VM boot up, it holds both IPv4 and v6 addresses, but /etc/resolv....
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1answer
291 views

Configure LAN for IPv6 with SLAAC on WAN

My ISP assigns me an IPv4 address via DHCP and an IPv6 subnet through SLAAC. I set up my pfSense box to use NAT and DHCPv4 for my LAN network which works fine. However, on the IPv6 side, my LAN ...