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Questions tagged [ipv4]

Refers to the 4th revision of the Internet Protocol, where addresses are usually displayed in the form of dotted decimals between 0-255. Ex: 169.254.0.1

The IP address of a device is its unique identifier on a network which allows communication with that device.

Given the fact that only 2^32 IPs are available, number which is already depleted, its successor (IPv6) has officially taken over on 6 June 2012.

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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, from 2008R2 to 2016. Simply put, DC does not…
Labsy
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How to know if the server application is listening on ipv6

In a VPS (webfaction) I opened a port 14152 and I am running an application which is listening connections on that port, this is the output of netstat -putan | grep 14152 udp6 0 0 :::14152 :::* 79238/./server.x86_ So is…
lapinkoira
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Postfix smtp client HELO on dualstack ipv4/ipv6

I have a Postfix mail server configured for outbound email, on a dual stack (IPv4 + IPv6) server. The IPv4 address is private as it's shared with other services on the same connection (SNATed to public IPv4) and the IPv6 address is public and unique…
Kirill Shatalaev
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IPv4 to IPv6 proxy/passthrough

I recently had an app rejected from the ios store for crashing during their (now) mandatory IPv6 test (didn't even know they did that). My server (on AWS) wasn't setup for IPv6, but I've fixed that with proper DNS and routing. It passes the tests…
user3249281
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IPv6 connectivity through IPv4 using OpenVPN

I've set up a Debian-based server at home, which handles dhcp and a bunch of other services. Unfortunately, even though the machine is capable of using IPv6, my ISP doesn't support it. I was wondering if it's possible to route the ipv6 traffic from…
theP1
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IPv6 Webserver reachable for IPv4 only Clients

I have a web server with a public IPv4 address. For this IPv4 address, I have a DNS A record for "domainA.com". Since more IPv4 addresses cost money at my hosting company, I am thinking about using a free IPv6 address to host another website on this…
chwzr
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Adding IPv6 support in Client-server application. Is it common to have IPv4 stack disabled at OS level in "Pure IPv6" production servers?

OS in considerations : Windows Server 2008+ We are adding IPv6 support in a complex client-server network application. Server opens many ports for listening, and different types of clients connect to different ports. We are considering multiple…
coderplusplus
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Nginx not spawning both ipv4 and ipv6 workers

Later edit After a LOT of troubleshooting the actual issue turned out to be a missing semicolon after the server_name directive. nginx -t -c /etc/nginx/nginx.conf wasn't catching it. Double-check for typos if you ever run into a case similar to…
Geuis
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Adding an IPv4-only Domain Controller to an existing pool of Domain Controllers with both IPv6 and IPv4

We have an existing pool of Windows 2008 R2 Domain Controllers on-premises. These Domain Controllers have IPv6 and IPv4 configured. Now we need to add another Domain Controller that will seat on an EC2 machine. EC2 does not support IPv6, so it has…
Pep
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Why doesn't the IETF reallocate IPv4 netblocks from regions that are over supplied?

I just was looking at the Hurricate Electric website, and it says that ARIN is out of IPv4 addresses. Meanwhile LACNIC, APNIC, RIPE, and AfiNIC have millions of unallocated IPv4 addresses. I did a number of search engine queries on variations of…
David
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DHCPD configuration by interfaces

I have two interfaces on a machine running Ubuntu 14.04 LTS. Which has two different interfaces namely eth0 and eth1. I need to give IP addresses to the clients by the interfaces. For example, Any client try to connect by eth0 and needs an IP…
Enes Unal
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Hosting is IPv4 only, can I have IPv6 clients?

My hosting is IPv4 only. My question is whether it is possible to allow IPv6 only clients to access my web (running Window Server 2012 R2). Is this possible using technologies like 6to4 or Teredo or something different that I can just install on my…
Wapac
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cannot bind a port altough LISTEN

I'm new to this problem I'm using Ubuntu 12.04 LTS via VMware My problem is to bind port 6703 i tried alot of commands to check if this port or open or not Error Message is Failed to bind to: 0.0.0.0/0.0.0.0:6703 My result after (("try")) to…
user1
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ssh connection very slow and delayed

I have recently created and configured an ubuntu server 14.04.3 with the help of the ubuntu-core tools. Networking with IPv4 and IPv6 works fine for me with different clients. But a few days ago, i have noticed that ssh connections are very slow. So…
user219962
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Is global IP one-to-many communication practical today?

One-to-many communication over the internet is an enabling technology for many fascinating business and research projects. In principle, IPv4 and IPv6 allow for such communication by the specification of IP multicast, see e.g. this post from 2012.…
Max Flow
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