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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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My Windows (not server) computer can be accessed with IPv6 but not IPv4 (telnet and HTTPs)?

I have a Windows 11 Pro computer with IIS enabled. It has public IPv4 1.2.3.4 and 1:2:3:4 (from https://whatismyipaddress.com/). I setup an IIS website and route my domain to my server with Cloudflare ...
Luke Vo's user avatar
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After switching to Spectrum, I can no longer access any Raspberry Pi using its IP address

After switching from Hotwire to Spectrum, I can't access any of my Raspberry Pi's using their new IP addresses: All of my other devices, including Mac and Windows, can be contacted fine, but for some ...
Parking Master's user avatar
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96 views

DMCA notice indicates packets with wrong IPv4 destination are being received by my router

I received a DMCA notice stating that BitTorrent packets with an IPv4 destination address of 97.118.208.52 were being received by my home WIFI router even though its IPv4 address at the time (...
Steve Emmerson's user avatar
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291 views

Is it possible to use the same IPv4 on multiple servers running apps on different ports?

My setup; 5+ dedicated servers connected through a switch /20 public IPv4 subnet on the switch Bridge network setup so any dedicated can use any IP from the /20 for any app I want to be able to run ...
Marry Jane's user avatar
1 vote
1 answer
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WiFi not working after adding a loopback address to WiFi interface in Windows

I think I did something that I was not supposed to do. While trying to learn something, I added a new loopback address to my WiFi interface in Windows without knowing what I'm doing. I typed the ...
Timotei Oros's user avatar
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1 answer
68 views

Trying to create a subnet to connect to a network device and I cannot see the IP address in my "route print" list

I'm trying to set up a subnet to connect to a Ubiquiti networking device I need to configure. I can't connect to it. This is on Windows 10. 1 - I've changed my ethernet TCP/IPv4 properties to: IP: 192....
Subjective Effect's user avatar
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1 answer
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why is IPv4 HIL contained in total length?

in Ipv4 packet there are both IHL and Total Length i understand that there is a need to know the size of the data, but why would I want to count the header length in two places instead of having HIL ...
joe joe's user avatar
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Why am I seeing ARP requests for addresses outside of subnet

In my home network I have a router running Linux, with several VLANs coming into the same physical interface. This is what things look like on the router: ➜ ip a 1: lo: <LOOPBACK,UP,LOWER_UP> ...
rvdp's user avatar
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4 votes
1 answer
859 views

Why does peer-discovery work for IPv6 but not IPv4?

I'm building a peer-to-peer protocol where nodes advertise the existence of other nodes by sharing the IP addresses they are connected to. This functionality is called "peer-discovery". One ...
Thorkil Værge's user avatar
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Fordwarding all incoming traffic to a specific dest IP through OpenVPN tap0 interface

Can anybody help me out on how I am supposed to make sure, my VPS accepts all traffic to 1.1.1.1/30 (sample IP) and forwards it to my pfSense instance? I've got the following setting: I have a VPS ...
misak's user avatar
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How do I solve an IP address conflict caused by a VPN connection?

I have my own home LAN, and run an OPNsense (a fork of pfSense) router to control it. I use the 10.0.0.0/24 subnet. One of my computers (in reality, a VM running inside Proxmox) connects to a VPN ...
Sod Almighty's user avatar
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Dynamic vs Static NAT? How to tell which and when one or the other is in use?

One source said that in NAT, multiple hosts share the same public IP address. Then I found out there's another type of NAT, which is Dynamic NAT that translates one public IP into multiple public IPs ...
lgrps's user avatar
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Windows ARP retry interval

I have noticed the following behavior with Windows 10. I am sending an ICMP packet every second or so to a valid IPV4 address using the Windows ping utility. I then remove the device from the ...
Jon's user avatar
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Why is my pc dropping this UDP packet?

I am using an FPGA to create IPv4/UDP packets. Below is what the packet looks like. Wireshark doesn't flag it for errors at all. I'm using a UDP checksum of 0x0000 (allowed for IPv4), the MAC/IP ...
stanri's user avatar
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1 answer
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Is using WireGuard keep-alive feature going to create issues when connected for long time?

My ISP uses symmetric CGNAT. So, for connecting to my WireGuard server over IPv4, I am using a persistent keep-alive settings of 25 seconds on my client to allow incoming connections. Is this okay? Or ...
theOne2023's user avatar
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1 answer
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Wrong subnet configuration works anyway in a shared bus, but doesn't work in switched lan. Why?

I was told that this configuration (which contains an error in DNS mask which is /23 instead of /24) works only because it's a SHARED bus. If it was a SWITCHED lan, the DNS responses from DNS to A ...
Allexj's user avatar
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1 answer
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Are link-local networks considered "public" by Windows?

My Windows 10 computer has an extra network interface attached via USB which is named Ethernet 2 when listed by ipconfig. Ethernet 2 has an IPv4 address starting with 192.254 like 192.254.N.N and its ...
Adam.at.Epsilon's user avatar
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41 views

IPv4 failing, link-local IPv6 works

For some reason, I can't reach my laptop by SSH over WiFi on its IPv4 address, as it always just times out. However, connecting to it via link-local IPv6 works just fine. Pinging the laptop over its ...
creeper6530's user avatar
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How can i connect to my home server that runs on a network using DS-Lite from a Ipv4 network?

I over the past year tryed to put up a home server and beeing able to conect to it from other networks, aspceially to host game servers for me and friends. Yet we always ran into the issue that some ...
Norman Bischoff's user avatar
1 vote
1 answer
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Security risks for Users using separate logins versus one generic login for the same database

We have several test databases that our support staff need to use. These systems have actual production data. For security reasons what is the proper and concise argument for each user having their ...
einsem1's user avatar
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1 vote
1 answer
399 views

ssh access denied via ipv4 but normal access via ipv6

I'm running Ubuntu 19 or 20 (both scenarios same) I can ping and ssh over ipv4 to my server. When i ssh it over ip4 it even asks for the username and password but denies access and shows "access ...
Pradyut Bhattacharya's user avatar
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3 answers
427 views

What's my public IP address

I ran this command in Windows: ipconfig. And it gave me this: Windows IP Configuration Ethernet adapter vEthernet (Default Switch): Connection-specific DNS Suffix . : Link-local IPv6 Address ....
lunix's user avatar
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Two public IPs from a single interface to two routers

My ISP provides me with two static public IP addresses which come in on the same ethernet wire. I want to use two routers (running OpenWrt) with one public IP per router. To achieve this, I have a ...
ki9's user avatar
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1 vote
0 answers
675 views

Windows 11 loses IPv4 address one hour after boot

Problem Description The problem I am observing is that I will lose connectivity with all non-local IPv4 hosts one hour after Windows 11 boots up. This would normally manifest as getting disconnected ...
Duncan's user avatar
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0 votes
1 answer
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Public IPv4 and IPv6 addresses are located in different countries while using VPN

I am currently physically located in Mainland China, so I use a VPN by a European university. With this VPN, I can normally access censored sites and many websites appear to locate me in Europe, but ...
Green绿色's user avatar
0 votes
1 answer
3k views

Translating a domain name into a IP Address

Suppose we have a website with a domain name of "www.youtube.com".Is it possible for us humans to translate this directly into a IP Address(IPv4) just by looking at which is after the last ...
Volpina's user avatar
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1 vote
1 answer
134 views

Define route that is preferred "always"

I'm currently implementing an IPv6 only service. Since it should also be consumed using IPv4, I'm implementing a translator. In the translator server, I need to add a route to a different netns to be ...
elysch's user avatar
  • 133
5 votes
2 answers
772 views

Is IPv4 APIPA indeterministic?

Japanese Wikipedia article page for link-local address mentions that the creation of link-local address is almost always indeterministic (非決定論的 in Japanese). The corresponding English page does not ...
Taro's user avatar
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1 answer
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How to set different dynamic IP address for each QEMU VM?

(Warning, предупреждение, попередження, avertissement (and whatever your language is): English is not my primary language. I wrote this through a translator). I need to run about 7 virtual machines ...
wineT's user avatar
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1 vote
1 answer
298 views

Do common OSes provide guarantees for IP fragment reassembly?

When sending UDP packets that exceed the PMTU, I'm told that the receiver will receive the packets in fragments. Does the network interface or OS of the receiver typically re-assemble the packets ...
Tom's user avatar
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0 answers
321 views

linux ipv4 forwarding limited throughput

My symptom is that client PCs on my LAN connecting through the WG tunnel to the remote host would max out around 250 Mbps, but it could be anywhere between 150 and 300 Mbps (i.e. lots of variability ...
Brian's user avatar
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1 vote
1 answer
432 views

What is the easiest way for me to access my IPv6 server from IPV4?

I have a Nextcloud server that works fine, but I noticed that I cannot access it from certain places. What all of these have in common is that they seem to use IPv4. This would make sense, as IPv4 is ...
Sebastián García's user avatar
0 votes
1 answer
580 views

How to configure a static IP address in the local network for a Ubuntu VM?

I am using a Windows 10 laptop connected to the internet via Wifi. On it I run a VirtualBox with Ubuntu 20.04.5. As I want to connect to the internet AND to the local network I plan to configure two ...
Alex's user avatar
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0 answers
245 views

Determine LAN and WAN IP address

Is there a simple way to determine the LAN and WAN IP address of a connected device? I frequently need to check the local and external IP addresses of devices, especially mobile devices, but I tend to ...
Felim Doyle's user avatar
0 votes
2 answers
475 views

Can I access IPv4 DNS resolver from IPv6-only network?

Everyone knows that it is not possible to run nslookup command through an ipv6 resolver with ipv4-only host. For instance the following command will result error on ipv4 host: nslookup facebook.com ...
Mohamad Reza's user avatar
0 votes
1 answer
158 views

Can I proxy mumble traffic from IPv4 to IPv6 with socat?

I have an IPv6-only Mumble server at home (because I have no public IPv4). I want to make it accessible to IPv4-only users with a small VPN. The VPN has a public IPv4 that I can ping The VPN has IPv6 ...
Krateng's user avatar
  • 111
0 votes
0 answers
70 views

Trying to change subnet of "static only" net-adapters from list of computer hostnames. Script runs but no change in subnet mask

I need to change the subnet mask of several machines at once from 255.255.255.0 to 255.255.0.0. The goal is for the script to only do this on net-adapters that have static ipv4 addresses, and for it ...
Mastaxx's user avatar
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0 votes
0 answers
530 views

How can I use the WAN interface IP address(es) in NFTables config?

Background I'm attempting to write an NFTables configuration that would allow me to keep IPv4 and IPv6 forwarding rules in the same table. I'm hosting some web services behind a reverse proxy and want ...
Mikael H's user avatar
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0 answers
2k views

Port forward on a new Huawei - HG8247W5 router

I searched the internet for a solution, however no-one seem to have this particular problem trying to port forward on a HG8247W5 Huawei router. This is how I tried to setup the port mapping: enter ...
Mikey's user avatar
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0 votes
0 answers
963 views

Network eth0 down and won't obtain IP address after most recent 'apt updgrade'

Recently, one of my headless ubuntu 20.04 systems started displaying "System restart required" at login. As such, I did apt upgrade & apt update (not dist update). I did not regain ssh ...
Dennis 's user avatar
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1 vote
0 answers
101 views

Missing ports on macOS in ipv6

I would like to understand how it is possible to have a number of different ports between my local ip v4 and v6. I have a NodeJS service running on port 57110 but I can't see it on my IP v6. How is ...
Marvin Sant's user avatar
1 vote
1 answer
522 views

Need clarification about ipv6 multicast and ipv4 broadcast

I’m studying IPv6 and I’m traying to better understand how it works in deep. So far, I know that there are essentially three types of addresses, based on the type of communication: unicast: one to ...
filograndipad2's user avatar
2 votes
1 answer
1k views

Some apps in WSL are inaccessible from the host OS while others are accessible on the same ports

I've got Ubuntu in WSL 2 running on Windows 10 (Version 10.0.19044 Build 19044) host OS. Windows Defender Firewall is fully disabled. What does work A very basic Express app index.js: const express = ...
lolmaus - Andrey Mikhaylov's user avatar
0 votes
1 answer
2k views

Subnet masking to get 2 subnets each with 126 host

Suppose we have a subnet mask of value 255.255.255.128. May I know please why this would split the network into 2 subnets each with 126 hosts? From my understanding, if the subnet mask was 255.255.255....
Avv's user avatar
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0 votes
1 answer
504 views

Static IP configuration with ip command in Linux gives Destination Host Unreachable

I am a total newbie when it comes to network configuration. I would like to configure my Ubuntu 18.04 PC so that it connects to a device. I use USB to Ethernet converter and connect the ethernet jack ...
mozcelikors's user avatar
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0 answers
564 views

Unable to get access to router home page after disabling NAT

I have a private home network using a single NETGEAR cable router. I accidentally disabled NAT in the router's home page, and after that I cannot access the home page anymore. The thing is that I was ...
ElektroStudios's user avatar
0 votes
1 answer
319 views

Directly Pinging a Device (IPV4)

Hello and thank you for taking time to read this. So I have a device (FPGA with network attachment on it) that I can change the IP address on. Normally it is set to 192.168.xxx.xxx and I can change ...
CakeMaster's user avatar
0 votes
1 answer
1k views

IPv4 address in AAAA DNS record not working

Background (feel free to skip reading) I have a server running Wireguard, to which multiple Android devices connect using the Wireguard app. This server has 2 WAN connections - a faster line that has ...
ManSamVampire's user avatar
0 votes
1 answer
339 views

Static IP address over different wifi access points

I'm setting up a headless PC in order for it to be accessible using ssh (over wifi) only, it has LMDE5 (a Debian based flavor of Linux Mint). On one hand, setting a static IP address will give me the ...
eblanca's user avatar
  • 11
1 vote
0 answers
84 views

Access WISP LAN Network From Access Point Wifi Network

I'm using TP-LINK TL-WR840N (master router) as a Access Point and TL-MR3020(slave router) as a WISP, from slave router LAN port I have connected a device. The WIFI IP is in 0 series and the LAN series ...
Codexxx's user avatar
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