Questions tagged [ipv4]
Refers to the 4th revision of the Internet Protocol, where addresses are usually displayed in the form: 192.0.2.235
446
questions
12
votes
8
answers
126k
views
How to access router with IPv6 address?
recently I tried to access my router's setting via 192.168.0.1 as usually, however, thing is that a year ago I have switched from ipv4 to ipv6 and now ipconfig shows me this:
Windows IP Configuration
...
0
votes
1
answer
41
views
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 ...
0
votes
1
answer
38
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....
0
votes
1
answer
7k
views
Changing DNS on IPv4 vs IPv6
I want to change my default DNS to Google DNS.
Many sites like streamble.com are blocked in my default service provider DNS. After some research I found that, if we switch to Google DNS, we can ...
0
votes
0
answers
268
views
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 ...
0
votes
1
answer
29
views
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 ...
0
votes
1
answer
3k
views
Access IPv6 server via IPv4 tunnel?
I am an installer for an ISP here in Alberta Canada. They recently launched LTE but are doing double NAT on IPv4 so accessing a server from the outside world isn't possible via IPv4. They do however ...
14
votes
6
answers
213k
views
What is IPv4 Autoconfiguration and why it overwrites static IP
I have to connect to a router with a static IP and subnet (machine automation, not internet). In ipconfig, subnet mask shows the subnet address I inputed but the IP is assigned a different one from ...
2
votes
1
answer
6k
views
CentOS Virtualbox no internet access
I have the following problem:
I have a VM with CentOS installed. From this machine, I can't connect to internet, so I can't upgrade nothing installed on it.
The VM configuration is:
Under Settings -...
0
votes
2
answers
11k
views
Can I use the same default gateway for a device on a different network?
Say I have IP 192.168.1.0 and all the IP addresses are taken so I go onto 192.168.2.0 and have 192.168.2.5 available. When I'm assigning a gateway for the device to access can I use a gateway on the ...
1
vote
0
answers
40
views
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> ...
1
vote
2
answers
7k
views
IP address rules for each octet
This Wikipedia article on IPv4 addresses states the valid range for each octet is 0-255. However, when I enter a number that is deliberately out-of-range on my Windows 7 PC, the valid range is ...
1
vote
0
answers
1k
views
Disabling IPv6 DNS resolution on client only to a specific domain
I want to connect to my company's extranet. However, I can't from my domain-joined laptop when it's at home, though I can when at the office, or a non-domain joined machine at home. The difference ...
0
votes
2
answers
285
views
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 ...
4
votes
1
answer
767
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 ...
0
votes
1
answer
15k
views
Why does my network adapter have two IPv4 addresses in Windows 10?
I have a USB Ethernet adapter (TP-Link UE330). I assigned it a static IP address: 192.168.6 199. I was having trouble automatically detecting a device on the network. I investigated and discovered ...
1
vote
0
answers
105
views
IPv4 to IPv6 address translation in Windows7
I have a Windows 7 PC connected to a IPv6 network. On the PC I have an application that needs to communicate with another IPv6 machine. The application can only be configured with an IPv4 address. Is ...
1
vote
0
answers
57
views
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 ...
0
votes
1
answer
298
views
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 ...
1
vote
0
answers
86
views
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 ...
11
votes
1
answer
15k
views
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 ...
0
votes
1
answer
99
views
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 ...
1
vote
2
answers
847
views
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 ...
-1
votes
1
answer
740
views
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 ...
45
votes
6
answers
262k
views
What does it mean to have a subnet mask /32?
I see in this question, the routing table has:
192.168.1.1/32 link#4 UCS 2 0 en0
openwrt.lan 46:94:fc:63:fc:7 UHLWIir 11 3610 en0 1200
...
0
votes
1
answer
2k
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 - | .............
-1
votes
1
answer
65
views
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 ...
0
votes
1
answer
86
views
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 ...
0
votes
0
answers
32
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 ...
0
votes
2
answers
864
views
What is my Gateway?
My wireless router has these items when I set it up, but I don't know the Gateway number.
IP Address 192.168.1.100
Subnet Mask 255.255.255.0
DNS Server 192.168.1.1
Secondary DNS Server 0.0.0.0
It ...
0
votes
0
answers
109
views
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 ...
1
vote
1
answer
118
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 ...
1
vote
1
answer
75
views
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 ...
1
vote
1
answer
190
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 ...
1
vote
1
answer
373
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 ...
0
votes
3
answers
414
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 ....
1
vote
0
answers
82
views
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 ...
1
vote
0
answers
514
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 ...
0
votes
1
answer
447
views
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 ...
0
votes
1
answer
2k
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 ...
0
votes
0
answers
1k
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 ...
0
votes
3
answers
16k
views
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 ...
5
votes
2
answers
757
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 ...
4
votes
2
answers
7k
views
Make socat listen on both IPv4 and IPv6 stacks
Switched providers the other day, they only assign DSlite-connections. I'm fine, I thought.
Thing is - I want to access some of my stuff from outside of my network, which should be of much less a ...
0
votes
1
answer
641
views
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 ...
15
votes
1
answer
267k
views
Optimal setting for advanced parameters for Realtek PCI-e GBE family network card
superusers.
I am trying to get the best possible setting for my Realtek PCI-e GBE family controller network card so that when it will be literally minimal or zero lag when playing online game.
(...
1
vote
1
answer
227
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 ...
0
votes
0
answers
287
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 ...
0
votes
1
answer
445
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 ...
0
votes
0
answers
222
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 ...