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.
1,841 questions
0
votes
0
answers
22
views
Access IPv4 sites through IPv6 only server [migrated]
I have a VPS hosting Wireguard that only has IPv6 addresses.
When I connect from my local machine, I can access google.com in Chrome, which prefers IPv6, but not in Firefox, which prefers IPv4.
Sites ...
0
votes
0
answers
37
views
Is it possible to tunnel IPv6 over IPv4 using Libreswan's IKEv2?
My local server only accesses the internet via IPv4 addresses. IPv6 is not supported.
The remote server has exactly one public IPv4 address and a /48 IPv6 subnet. Is it possible to provide the local ...
0
votes
0
answers
48
views
Support for CNAMEs in the pfSense DNS Resolver
Some background
I have a home network built on a NetGate 1100 with pfSense. This has been running well for a couple of years with IPv4 only. I have upgraded it now to pfSense 25.07.1
With an IPv4 ...
- 193
0
votes
0
answers
91
views
IPv6 EKS Cluster - Nodes Not Joining due to Router Advertisement Errors
Problem
I'm trying to create an IPv6-enabled EKS cluster, but I've been hitting numerous issues and I'm feeling a bit stuck.
When I first tried to set it up, the Amazon Linux 2023 EC2 instances couldn'...
- 111
1
vote
1
answer
105
views
Postfix multihome not sending from IPv4
I've a server with both IPv4 and IPv6 interfaces. Postfix is multihome, one instance, named postfix, is IPv6 only, and another, named postfix-kupec, is ipv4 and ipv6.
Here's an output from postconf:
...
- 115
0
votes
1
answer
118
views
How to debug when an OpenVPN client disconnected and can't reconnect
Summary
My OpenVPN client lost its connection to the server in the middle of the night and I can't reconnect it. Perhaps this is more a networking issue than an OpenVPN issue but HTTPS sites are still ...
1
vote
1
answer
168
views
IPv6 tunnel between 2 linux hosts
I've got 2 linux hosts running same kernel version. Both hosts have IPv6 public addresses. Both hosts can ping -6 each other. I'm trying to create IPv6 tunnel between them.
HostA:
sudo ip link add ...
- 113
0
votes
0
answers
46
views
How to convert between reverse and normal ipv4/ipv6 in powerdns recursor lua for database lookup?
The direct question is how to convert a string of reverse address (like "4.3.2.1.in-addr.arpa" or "d.c.b.a.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.7.6.5.4.3.2.1.1.0.a.2.ip6.arpa") ...
- 314
0
votes
1
answer
113
views
Postfix not using smtp_bind_address6 for sending
I've got Postfix running on a Ubuntu 22.04 box. The box has several IPv6 addresses, including a:b:c::2 and a:b:c::25. I want Postfix to use a:b:c::25 for sending messages.
a:b:c::25 has a PTR record ...
- 3
0
votes
0
answers
102
views
How to setup an AWS EKS cluster without a NAT gateway and without public IPv4 for the worker nodes?
I have an IPv4 EKS cluster on AWS.
My worker nodes have public IPv4 IPs.
AWS charges money for public IPv4s and I would like to get rid of them.
I also understand that I could use a NAT gateway with ...
- 101
0
votes
1
answer
208
views
Kubernetes node won't join using calico
I'm making a kubernetes cluster where the controlplane has one public ipv4 address, and the workers have a public ipv6 address since this is cheaper. They share one ipv4 subnet in order to talk to ...
- 141
0
votes
0
answers
52
views
snmpwalk works over ipv4 but fails over ipv6
Here is the script that launches the snmpd server in a FreeBSD system
rc_start() {
echo "Starting net-snmpd..."
# Ensure no other copies of the daemons are running or it breaks.
/usr/...
- 1
0
votes
0
answers
78
views
pods with ipv6 addresses cannot be accessed via ipv6 on nodes k8s/calico environment
I tried to add ipv6 to the k8s cluster, ipv6 already added, but the issue is that the pod is not accessible through ipv6 by the node where the pod resides, but it is accessible through ipv4, the ...
- 101
0
votes
1
answer
60
views
Dynamically bind to IP from subnet without specifically adding IP into interface
I'm trying to dynamically use an IP from a subnet of /48 IPv6, the problem is that since it's an IPv6 subnet, there are too many ips to add into the interface. I would like to dynamically bind to an ...
- 1
1
vote
2
answers
443
views
How to bridge IPv4-Only Clients to an IPv6-Only Server?
I need help with networking, docker and ipv6.
Here is my setup:
Server A: IPv4-only
Server B: Dual-stack (IPv4/IPv6) (This is my dedicated server with a provider-assigned ipv6 addresss)
Server C: ...
- 11