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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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2answers
30 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
30 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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0answers
48 views

Setting up stateless IPv6 configuration on Ubuntu 16

Is it possible to setup a stateless IPv6 config on my ubuntu machine when the backend is DHCPv6 I am trying to find a solution to get my Android devices to have IPV6 IPs if my ISP supports a Stateful (...
0
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0answers
12 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=...
1
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0answers
28 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 ...
8
votes
2answers
608 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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0answers
13 views

Accessing IPv6 Only Network from IPv4 Network? [closed]

My ISP has provided me IPv6 only internet connection. If I connect from my IPv6 PC to IPv4 Internet I have no issues, because the ISP does all the IPv6 to IPv4 conversion. However, at home, on this ...
24
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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 ...
0
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0answers
22 views

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 ...
1
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0answers
23 views

IPv6 prefix delegation [migrated]

I'm a complete noob at IPv6, but have some practical experience of IPv4 (just because I had to deal with it). My home router is behind CGNAT so they don't offer public IPv4 addresses, but I'd asked ...
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0answers
17 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 ...
1
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0answers
21 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 ...
1
vote
1answer
34 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
12 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, ...
0
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0answers
29 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 ...
3
votes
2answers
157 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:...
1
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1answer
85 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
votes
1answer
17 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
vote
1answer
36 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
vote
1answer
44 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
49 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 ...
0
votes
1answer
43 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 ...
0
votes
1answer
54 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
votes
1answer
47 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 ...
0
votes
1answer
35 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
26 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 ...
0
votes
1answer
29 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
votes
1answer
67 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 ...
0
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1answer
47 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 ...
0
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0answers
29 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 ...
0
votes
0answers
45 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 ...
1
vote
1answer
57 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
35 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....
0
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1answer
157 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 ...
0
votes
1answer
74 views

Get IPv6 route for VM

is there any option to get something like this for IPv6 (inet6 or -6): ip route get 8.8.8.8 Result: 8.8.8.8 via 94.**.***.1 dev ens3 src 94.**.**.112 uid 0 cache Where I can get the local IPv6 ...
0
votes
0answers
82 views

Cannot access public IPv6 address from outside

My pc is assigned 3 global scope IPv6 addresses (1 is local) which are inet6 2402:d000:a000:8090:b0e5:ed66:90e2:2 prefixlen 128 scopeid 0x0<global> inet6 fe80::eff8:de37:10c7:db4a prefixlen ...
2
votes
1answer
40 views

Is it possible to change the IPv6 address of docker0 bridge?

I'm trying to set up a docker based application on a virtual server running Ubuntu. The application is supposed to work with IPv6. No problem, I got a /64 network from my server provider, it is ...
0
votes
1answer
45 views

Dualstack support for IGMP multicast NLB on Windows 2016

I have two Windows 2016 VMs set up as an NLB cluster. Each guest has two interfaces, one of which is for the NLB, the other for other traffic. I've added an IPv4 and an IPv6 address to the cluster. ...
0
votes
1answer
90 views

Ubuntu defaults to IPv6, should default to IPv4

Ubuntu 16.04.5 with kernel 4.4 used to work as intended: IPv4 is default. Since changing to kernel (hwe) 4.15, it uses IPv6 as default. It has IPv6 available via Tunnelbroker, broadcasted by the ...
0
votes
1answer
155 views

Problems with DNS and IPv6 on Server 2012 and 2016

I manage hundreds of servers for many customers. Most are SMB segment, having 1 to 3 servers per customer max. In past few weeks I get more and more frequent DNS errors on random domain controllers, ...
2
votes
1answer
136 views

IPv6 over IPv4 in OpenVPN on a server that has multipe non-consescutive IPv6 addresses

I have a server that has 1 IPv4 public address and 10 public IPv6 addresses (each one /128, not in the same subnet like a /64 or /48) - I know it sounds strange but I have no control over this, it is ...
1
vote
1answer
45 views

Setting up IPSec/Firewall for printer with ipv4 address, allowing ipv6

I have an HP P4014dn printer with a publicly accessible static IPv4 address. It's also enabled with a link-local FE80 IPv6 address. I've setup the IPSec/Firewall settings to allow traffic from only ...
1
vote
2answers
105 views

Docker IPV6 routing

My host has ipv6 which works fine. But my containers cant connect out on ipv6. Docker version 18.03.1-ce, build 9ee9f40 /etc/network/interfaces (host) iface eth0 inet6 static address 2001:xxxx:...
0
votes
0answers
66 views

OpenWRT map-e configuration for DHCPv6?

Does anybody have an example OpenWRT MAP-E configuration that works with DHCPv6 provisioning? There is an example for a MAP-T from Cisco (using the Google cached page as the Cisco link seems down now):...
0
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0answers
31 views

error: “net.ipv6” is an unknown key

On one of my CentOS 6 machines I get $ sudo sysctl net.ipv6 error: "net.ipv6" is an unknown key Why do I see this and how can I fix this?
0
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1answer
66 views

How to protect a web application from IPv6 bots?

I'm interested in this in the context of protecting a web application from bots, but I guess it applies to all kind of attacks that can be done over IPv6 by bots. In a web application, you have some ...
1
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0answers
47 views

sendip IPv6 ICMP ff02::16

I would like to send the following packet out with the sendip program (or any other program): IPv6, destination address: FF02::16, source address: (mine) ICMPv6, type: 143 (Multicast Listener Report ...
0
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0answers
43 views

How to force auditbeat to use ipv4 address to connect to elasticsearch when both ipv4 and ipv6 are available

We are currently rolling out ipv6 to various services, but some systems have not been approved by our security team, and so ipv6 access is blocked by a firewall. The firewall issue is not something I ...
0
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1answer
239 views

Why is a /128 IPv6 address assigned via DHCPv6 in Ubuntu?

I am testing the implementation of IPv6 in Ubuntu. My Ubuntu linux client correctly gets RA from server and configures an address in the advertised prefix. Next it gets another address via DHCP which ...