Questions tagged [ipv4]

Refers to the 4th revision of the Internet Protocol, where addresses are usually displayed in the form: 192.0.2.235

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21 views

I get same private IP for different IPS connection

I am connecting my pc through mobile hotspot(2 different mobile phones with different ISP). Suppose I connect to one hotspot I get IP address as X (for eg) and if I connect to another hotspot from ...
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Simple Failover dual homing setup

I have a 50Mbps fiber connection, and it has daily downtime of 10%. The connection is down, exactly when I start to do something important. Also, I have a 4G connection with 4GB/day limit and weekend ...
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Force Google Chrome to visit a website with IPv4 (instead of IPv6), possible?

Is there any way to force Chrome to visit a certain website with IPv4 only and not use the IPv6 address? I know there is a way which works for Firefox, as in going to "about:config" then ...
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Increasing connection timeout for tcp connection in freebsd after 360sec has no effect

Test Setup Configured a firewall to drop connection from a remote address IP address : 'yy.yyyy.yyyy.yyy' IP port : 'zzzz' [root@mmmmm /path/to/log]# cat ipfw.today 00100 1438 86280 deny ip ...
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Subnetting - 192.168.20.29/28 Valid Host Addressses

I'm in the process of practicing subnetting and came across this question, which I cannot find an explanation online. The question: Given the address 192.168.20.19/28, which of the following are ...
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How to assign IPv4 addresses to LAN clients on OpenWrt?

I flashed my router with OpenWrt and while WiFi devices receive IPv4 addresses, LAN [wired] devices receive IPv6 addresses. I am new to networking and not familiar with IPv6, so I would like to avoid ...
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830 views

Accidentally changed an IPv4 setting on Synology NAS Cannot access it anymore

I have a Synology NAS which was working fine - for the usage I was making of it : backup - but it wasn't connected to the internet. I was able to access it via the browser GUI or in windows (via \...
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1answer
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Impact of Enabling UDP Checksum (IPv4) on the System

AFAIK, UDP checksum is an optional feature on IPv4. I want to enable it on a gateway (IPv4), but I want to know if it has any negative impact on the system, e.g., increasing CPU utilization or ...
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1answer
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Does CIDR Notation do away with matching IP/Subnet masks?

With CIDR notation, do IPs and subnet masks need to match? For example, 192.168.0.0 = 255.255.0.0? Or does CIDR do away with this entirely? How does a network know if the host IP address is on the ...
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Migrating Home Network/Server to IPv6

So, My current setup includes 2 internet connections via different ISPs coming into my multi-wan router (TL-R480T+) along with another connection from 4G Router. So, in all 3 internet connections. ...
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macOS: Ping no response but ping6 working

I have a MacBook Pro 2015 running on macOS BigSur 11.1. The device is connected via wireless-lan to my router. The network is working with ipv4 and ipv6. The MacBook gets an ipv4 and an ipv6 address. ...
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ip address to connect to remote database

I understand that there's local ipv4 address that we can get from ipconfig in commandline and the public ip address that we get from google. If I am trying to establish connection to a remote database,...
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ICMP-IPv4 total length exceeds packet length

I have a problem with +500byte ICMP packet, I am using ubuntu 16.04 and firewall inactive. When I try to send ping with this command ping -s 500 192.168.1.127 ping is successfull, but when I try to ...
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Is it normal to have 2 IPv4 DNS addresses on my PC?

I'm new here and not very knowledgeable when it comes to computers so I'm sorry if my question comes across stupid. I have been working from home and I checked my WiFi connection on properties (using ...
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Are local IP addresses on home routers always IPv4?

What the title says. I want to know whether I can assume all internal IP addresses supplied by a regular home router will be IPv4 or might they be IPv6 as well?
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1answer
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When I do a GeoIP lookup, why does the nearby capital city come up instead?

(I am starting this Q/A to help a mispost on https://security.stackexchange.com/questions/242826/why-is-an-ip-address-in-a-different-city) I personally live in a smaller city outside of my State's ...
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How can I configure my router to assign two static IPs to my computer?

How can I configure my router to assign two static IPs to my Computer? My router is a D-Link DIR-825ACG1 AC1200 Router. And my PC is running Ubuntu 20.10. When I go into my routers LAN settings, I am ...
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Do you need two separate IPs each, for hosting a website, and for hosting a mail server? [IPv4]

Edit - I am only talking about public static IP addresses here. Do you need two separate IP addresses each, for hosting a website, and for hosting a mail server? Or can I use the same IP address for ...
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Circumvent DS-Lite restrictions to allow incoming IPv4 request on single port

I have recently moved, and my new ISP provides a DS-lite/carrier-NAT connection so that I do not have my 'own' IPv4 address but I'm pooled with many other people behind a single IPv4 address. As a ...
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internet/ehternet not working on new pc

I upgraded my pc and it won't connect to the internet , installed new windows 10 ,still won't . when I install the network drivers they won't show IPV4 installed . also I noticed that when I go to ...
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How to find the fixed IP of a device connected directly to the computer?

We have an Automatic Weather Station. I connected my PC using an ethernet cable to it directly. I accessed the AWS using the IP 192.168.1.115 and changed the IP to some other class fixed IP. After ...
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Why does “ping X” work, where “X” is an arbtrary whole number?

So, I discovered a strange quirk of the Windows 10 ping utility. If you ping a whole number instead of an IP address, it will "convert" that number to an IPv4 address. The conversion is such ...
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How do I access a IPv4 web server outside my LAN via IPv6 network

I am new to IPv6 Networking. Some background: I have CCTV NVR which is only IPv4 compatible. And my ISP is only IPv6 compatible. When on my local network I can access my NVR using 192.168.1.9. Now my ...
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1answer
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on windows 10, how to make sites use only ipv6, and block ipv4

sites say that blocking ipv4 is at os level and not browser level when you go to sites, use only ipv6 steps?
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Configuring two network cards so that I can access them at the same time on Linux

I'm a bit of a beginner in Linux (I'm using CentOS 7). I have a workstation with two network cards. I configured them so that each has its own WAN. However, I can't access (using ping) them at the ...
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What are AI_V4MAPPED addresses used for?

I found an odd network configuration on an old RHEL 5.8, hosting an Oracle DBMS. The line I don't understand is the one concerning the address:port ::ffff:127.0.1.1:1521. I never saw that before. I ...
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54 views

How can I have two different IP addresses according to the internet?

I have cable internet connection(with IP address xxx) and 4G USB modem connection(with IP yyy) plugged at the same time into my pc (win 10). When I open google chrome browser, incognito mode, and ...
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ipv6 and ipv4 options disappeared from win10 boot menu, how to get them back?

My boot menu used to have ipv4 and ipv6 options in bios that I could use to boot into recovery menu, I installed a new ssd and hdds and started using clone drives and backups to do the process and it ...
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Windows PC as a Router ? (Without ICS)

My PC (running Windows 10 Pro) has two interfaces: LAN 1: 10.1.0.100/16 , Default Gateway : 10.1.0.1 LAN 2: 192.168.100.1/24 I also have another PC connected to the second LAN interface with IP 192....
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1answer
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Secondary router preventing from accessing specific domains

I live in a three story house, and unfortunately putting the router on the middle floor is not an option, reason why I get a very weak signal downstairs. I then decided to do what I did a couple of ...
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2answers
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How bypass ISP using CGNAT and open all ports? SSH? VPN?

First of all sorry for my english. IPv4 connections are routed through carrier grade NAT(CGNAT) and the ISP does not provide IPV6. This way I can't open any port. I tried reverse tunneling (ssh) on a ...
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1answer
178 views

Local machine causing connectivity problems to IPv4 websites

I set up a local machine participating in a blockchain p2p network using Ubuntu Server 20.04. The computer is connected to my (low-end) home router via Ethernet cable (and/or Wi-Fi). If the machine is ...
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IPv6 IPv4-like DHCP Binding

Is there a way to have DHCP binding like IPv4 for IPv6? My router is a ZTE H288A. I set the DHCP bindings for my devices so it would have the same public ip address when connected to the network (...
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1answer
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IPv4 Subnetting - Finding IDs for specific subnets

I need to know how to calculate/find the network ID for a specific subnet. For example, if we need 1000 subnets and 35 usable hosts, how do I find the subnet ID for the 250th subnet? Also, how do I ...
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2answers
103 views

How to change IPv4 Address on Public Wi-Fi?

I have two computers running Windows 10 that are connected to my Hotel's Wi-Fi. I am working on a project that requires both computers to be connected to the same Hotel router, i.e. the "host&...
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1answer
4k views

/etc/network/interfaces file not found

I am running ubuntu in a Virtualbox VM. I have configured the interface via the GUI(and it works as expected). However, I can't find /etc/network/interfaces file. then where can i find primary ...
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I use a home network with DHCP enabled and I cant set a static ip

So I'm quite perplexed by this... I used the basic technique of going to network and sharing center, going to ethernet properties selecting Internet Protocol Version 4 (TCP/ipv4) and selecting an ip ...
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Debian network interface doesn't have ipv4

I'm using Debian 10.04 on VirtualBox with 2 network adapters: NAT + host-only. Running ip a the NAT receives address 10.0.2.15 and works fine. The host-only adapter only receives an ipv6 address and ...
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1answer
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Since activation of IPv6 on Win7, VPN routing fails + wired link DHCPv4 fails

I have an ISP box connected to a Netgear WiFi router. Internet <-->[WAN] ISP box [LAN]<-->[WAN] Netgear router [LAN]<-------> Win7 laptop 192.168.0.x/24 ...
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How do I change the public IPv4 and IPv6 adresses via CMD?

How do I change the IPv4 and IPv6 addresses via CMD? I saw all other articles, but they seem to change both the private and public IP addresses.
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Can someone help me portforward?

Like others, I seek to port forward a Minecraft server. I do not know what I am doing wrong, every time I try to set up an IPv4 portforward, it never works out. Whenever I input: I get: For ...
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1answer
26 views

Update the DNS address for all PCs in a specific domain

I'd like to make a script that updates the DNS address on all our windows 10 PCs but only for the NIC that is connected to a specific domain. The problem is that our PCs have multiple NICs connected ...
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1answer
935 views

IPv4 settings in Fritz!box and clients for private VPN

I'd like to set up a VPN from an android device and from a Windows laptop to my router (Fritbox 7490) and need help to figure out which "IPv4 address" I have enter in the respective fields while doing ...
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1answer
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Why isn't grep agreeing with other regex tools?

I am currently trying to write a grep command to find IP addresses in its input. My regex is \d+\.\d+\.\d+\.\d+ which works as expected in an online tester with all flavors of regex. Yet, when I ...
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1answer
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Finding the default subnet mask, the network address, and the broadcast address of a Class D IPv4

In the address 225.97.13.7 (Class D) how would I go about finding the default subnet mask, the network address, and the broadcast address, known that it's in IPv4? Would it even be possible to do so?...
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1answer
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IP Addresses on a DNS server system

Which of the following IPv4 addresses could be set on a DNS server system? 127.0.0.1 193.231.20.1 192.168.2.2 255.255.255.0 What am I thinking is that the first ip address is the "loopback address" ...
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1answer
802 views

How to force the usage of IPv4?

I need to check timings on my Ubuntu machine by ping www.xyz.com but using IPv4 only. How can I check if I have both (IPv4 and IPv6) connectivity? How can I force usage of IPv4 for this particular ...
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912 views

Can't ping IPv4 through Wireless Access Point repeater (while pinging IPv6 works)

I have this setup and problem: MAIN ROUTER | ----------> | Second router (acts as an access point repeater/extender) Can ping IPv4 - | ............... | Can't ping IPv4 Can ping IPv6 - | .............
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1answer
749 views

Why does having an iPv6-only contract with my ISP could affect online gaming?

What is the reason some Online Games nay not work properly when one's ISP provide IPv6 only? Some ISPs offer IPv4 at an extra cost. Are there alternatives to this to solve the gaming related problems,...
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1answer
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How to access internet which requires manual IPv4 settings and LDAP-username-password login during Arch Linux installation?

I am on an university-network that requires me to manually set IPv4 settings and then open an url on the browser to login with LDAP username and password to access internet. I can connect to the ...

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