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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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How to tag IPv4 and IPv6 packets with different VLAN tags on a Linux box?

I want to tag incoming IPv4 and IPv6 packets from a dual stack enabled connection with different VLAN tags, e.g. IPv4 packets should go to VLAN4 and IPv6 packets should go to VLAN6. To be more general, I want to split the dual stack ip stream with…
Ingo
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AWS EC2 Instance Public DNS includes IP address

My AWS EC2 instance's public DNS has the public IP address in it separated by -. For example: ec2-x-xx-xxx-xxx.ca-pacific-x.xxx.amazonaws.com. Now, my question is when I give my users this DNS, is it safe knowing they have access to my public IP…
Sid
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Why does setting MTU 1452 solve Internet problems and how to fix root cause?

In our church we get Internet uplink from a friendly neighbor’s WiFi. At first everything seemed (at least) fine but since some weeks general “Internet stability problems” increased and since approx. 2 weeks my Raspberry Pi on site couldn’t…
Daniel Böhmer
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Is it possible to check that given IPv4 and IPv6 belong to the same NIC?

Given an IPv4 and an IPv6 address of a machine and only access to the public services it provides, is it possible to check that they are assigned to the same network interface controller? Assume the machine is a LAMP server using Let's Encrypt SSL…
Xilexio
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Are there issues if you run a IPv6 private network with IPv4 values and an empty prefix?

So i recently found out that the last 32 bits of an IPv6 can be addressed by their decimal value (not universally, busybox ping doesn't). So your IPv4 network is 10.0.0.0/8 and your IPv6 is ::10.0.0.0/104 (but your probably want to assign it as…
Iván
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Synthesize A records when only having AAAA

I'm hosting some things from my home network and my ISP doesn't provide me with an IPv4 address. Not with a way to port forward to it anyway. I've got my servers running using IPv6 and everything works great, until I had to share things with the…
Noud Zandbergen
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Azure: Difference between IPv4 and IPv6 single IPs versus bundle

I want to assign public IPs to my services (IPv4 and IPv6 are needed) but I can choose to either: Assign a dedicated IPv4 Address Assign a dedicated IPv6 Address Assign a bundle - of an IPv4 and IPv6 Address... As I need both I'd like to know…
Sebastian Vivten
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confused about CIDR interpretation

I am beginner in networking and trying to understand subnetting. What I understood is that CIDR notation (Classless Inter-Domain Routing) is an alternate method of representing a subnet mask. It is simply a count of the number of network bits (bits…
NNN
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Cannot display default NGINX page

I just installed Ubuntu 20.04 on my server. I also installed Nginx. My problem is that the default sie Nginx page is not displayed. Yet UFW is not activated. Do you have an idea of the problem ? This site is inaccessible 24.76.99.542 took too long…
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Removing IP address from server takes down unrelated website

I'm working with a Windows 2008 Server running IIS. One of the websites running in IIS was migrated to another server. As a result, I shut down that site in IIS on the Windows 2008 server. There weren't any issues there. However, when I removed the…
CacheMoney
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Why would hostname -I report 3 IP addresses?

Environment: Fresh install of CentOS 8, Digital Ocean Droplet Question: Why would hostname -I report 3 IP addresses? Shouldn't it show 1 IPv4 and 1 IPv6 address? My Output: (IP addresses changed) 149.50.50.1 10.10.10.1…
myNewAccount
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In small network, how to provide ipv6 addresses in existing ipv4 subnet?

I have an ip4 192.168.0.0 subnet, with a few dozen hosts, and 6 or so servers with static IPs. I use bind 9 (On Centos 7) internally to service ip4 DNS requests. For years, I've disabled ip6, because I did not need it, and because there is no ip6…
Charlweed
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Ping Hyper-V Virtual Switch IPv4

I wanted an IPv4 service running on the Hyper-V host that only the VMs can access via a Virtual Switch. Hyper-V Server 2016 (removed IPv6 public prefix) Ethernet adapter vEthernet (Public Switch): Connection-specific DNS Suffix . : …
nijave
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Generate DNS zone redirecting subdomains to IP subnet

I created DNS zone as in example below. Is there another, clean way to redirect subdomains to IP address? Maybe with bind9 $GENERATE? Can I use regex or iteration with existing DNS software? Where to start, and can DLZ (Dynamically Loadable Zones)…
Tymek
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Disparity of allocated IPv4 addresses between US and China

According to IPinfo.io, United States has 1,103,394,048 IPv4 allocated addresses, while China only 342,840,576, despite having four times more population. Is there any legal/historical/technical reason for this disparity?
Pedro Lobito
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