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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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Service bound to ipv6 on linux machine - Can I disable IPV6 and access service on my IPV4 address?

I am attempting to install Tableau Server on Ubuntu 18.04 and have the management service running on port 8850. I am unable to access the service at that port on my IPV4 address as it seems to be on my IPV6 address. These are my listening…
Kelvin Lawson
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What does exactly break with double NAT?

There are many warnings about double NAT networks. DSL---modem with router-----second router configured by ISP inner network first NAT second NAT What will exactly break in a double NAT network?
Jonas Stein
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Force DHCP client to use only IPv4

I have Linux client (running systemd-networkd, version 244), and I want to configure it's network only with IPv4. However, the DHCP server offers both v4 and v6. Is it possible to limit the client to only take the IPv4 configuration? I configured…
user951769
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IPv6 vs IPv4 available subnets - enough or too less

I read a bit about IPv6 and found that usually you get assigned a /48 prefix address. Which gives you 16 bit for subnetting. Reading further assuming that you use /64 subnets you would end up with 65535 possible subnets with a lot of IP-Addresses in…
metriXc
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How to proxy ftp connection between IPV4 server to an IPV6 client and vice versa

We have a gateway solution which connects legacy RADIO's having ftp server running with IPV4 interface to DU's running with IPV4 ftp clients to do file upload and download operations. And currently we use ftp-proxy to proxy the ftp connection…
Neeraj
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Cannot ping two computers with each other on the same switch. (Newbie)

I am an absolute 0 in network science and I would like to understand it a little bit. We have an offline machine connected to a switch, which is also connected to a series of other hardware that control various motors and sensors. In this offline…
lexax127
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Why does facebook only have 2 IP addresses?

In the process of setting up DNS for my own website I got curious about looking up a large company's DNS record. I chose facebook.com and used dnschecker.org to view their dns record. Ignoring AAAA records because the majority of people still use…
Currn Hyde
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About 198.18.0.0/15 segment

What exactly is the use case of 198.18.0.0/15 segment As per whois records, this segment is reserved as depicting below - NetRange: 198.18.0.0 - 198.19.255.255 CIDR: 198.18.0.0/15 NetName: SPECIAL-IPV4-BENCHMARK-TESTING-IANA-RESERVED Can i…
Gaurav Kansal
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How to blacklist the "prefix" of IPv6

With IPv4 it is pretty easy to blacklist IPs since it's not cheap to get new IPs and they are limited. However, with IPv6 it's pretty easy/free to generate a huge amount of unique IPs and it's pretty hard to blacklist some user based on his/her…
Dani
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Link-local IPv4 network scope on Windows

We have an embedded PC that initially starts off life with a link-local IPv4 address, typically 169.254.0.1. It broadcasts its existence using Zeroconf using the python-zeroconf library. These Zeroconf messages are happily received on the Mac, but…
iphaaw
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SSRS 2019 not listening on IPv4 Ports, only iPv6

We installed SSRS 2019 on a Windows Server 2016 without any problems and configured it to use URLs with port 80. Accessing those URLs (Service and Portal) via local browser works fine, but trying to access from another server fails. Investigations…
tmoe
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How does a node differentiate between an IPv4 and IPv6 datagram?

In a computer network, how do hosts and routers tell if a datagram is IPv4 or IPv6? Do they just look at the version number field of the packet header?
Newbie123
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iptables -> ip6tables (convert)

I have the following iptables (ipv4) and need the same on ip6tables (ipv6) for an openVPN-Server: # Flushing all rules iptables -F FORWARD iptables -F INPUT iptables -F OUTPUT iptables -X # Setting default filter policy iptables -P INPUT…
Omexlu
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Ubuntu Server 20.04: IP address in use

I have a bare metal dedicated server with a UK hosting company. They have an automated system which keeps blocking my server because they claim that I am using an unauthorised IP address. The IP address which they claim my server is trying to bind…
user1022788
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Why can't my internal IP addresses be granted access from IIS 10 IP Address and Domain Restrictions?

Why can't my internal IP addresses be granted access from IIS 10 IP Address and Domain Restrictions? Backstory: I have implemented IIS 10's IP Address and Domain Restrictions to block access to one particular website for all but an authorized set of…
jlavallet
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