Questions tagged [ipv4]
Questions related to the fourth version of Internet Protocol , which is one of the core protocols of standards-based internetworking methods in the Internet.
61
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Ipv6 vs Ipv4: is there a way to force ipv6 use?
Ubuntu/Linux beginner here, so I was wondering if there's any way to force Ubuntu to prefer IPv4 or IPv6 when resolving a name (ex.: google.com has ipv4 and ipv6 addresses. is there any setting which ...
- 147
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0
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58
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Ubuntu 20.04.2 LTS lost internet connectoin out of sudden
My PC is connected to a router. The router has been working all the time and had internet connection. Several days ago I noticed that I suddenly cannot connect to my PC through the router admin page ...
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0
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0
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19
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Internet not reachable from subnet on same card
Hi (sorry for my awkward english)
I'm working on ubuntu 18.04 with ifupdown (/etc/network/interfaces etc.), not netplan.
I'm trying for several days on this difficulty.
one PC (A) with 2 cards :
...
0
votes
1
answer
138
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20.04 Cloud-init appears to disable ipv4 DHCP on eth0
I'm doing a fresh install of 20.04 on some Raspberry Pi 3s. The SD cards were flashed with Ubuntu 20.04 Server (32bit) using the RPi imager.
When cloud init finishes wlan0 has an ipv4 address from ...
- 131
0
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1
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33
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Turn off IPv6 resolution for particular URL only
I'm having an issue with registry.npmjs.org -- When I attempt to access it through the command line (e.g. implicitly by using the npm command, or when doing a ping registry.npmjs.org), the access ...
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1
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115
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Terminal has network (DNS?) issues but browser works fine. ipv6 issue?
EDIT: It seems it might be a cable modem issue: according to https://test-ipv6.com/ ipv6 is not working both in Ubuntu as well as windows (dual boot, same workstation), and neither on my smartphone ...
- 101
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1
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140
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Wired Connection Not Working, Ethernet Cable Works Properly
I just performed a fresh install of Ubuntu 20.04 on my HP workstation, however the wired ethernet connection doesn't work, even though the ethernet cable works (tested on a different workstation and ...
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0
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1
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489
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Internet access constantly dropping out, "IP Configuration was Unavailable" - unsure if the issue is my laptop or the network!
My google-fu is failing me on this; researching where to turn next is leaving me baffled.
I have an MSI laptop from around 2017 with Kubuntu 22.04 installed on it. I work at a hotel desk, and I often ...
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0
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0
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76
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IPv6 "Activation of network connecting failed" [WiFi] and many urls unreachable (incl snap)
The first thing I noticed was that snap could not connect (running release 22.10):
Failed to find refreshable snaps: status-code=500 kind=(null) message=cannot list updates: persistent network error: ...
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0
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1
answer
809
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Problem with my iptables configuration on reboot
I tried many times to save the iptables configuration to have it start up automatically when I reboot my Raspberry Pi (Ubuntu 22.04.1 LTS) but when I look with this command:
$ sudo iptables -L
my ...
- 35
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80
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Ubuntu 22.04 losing wifi connection everday at the same period
The wifi of my Ubuntu 22.04.1 works normally for most of time. But, recently, each day at around 21:45 to 22:45, I will lose the connection to my apartment's public wifi from my laptop.
Strangely, ...
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0
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0
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25
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Multiple interface / Multiple IPV4?
I'm so sorry i'm french. I will try to translate
So i have a problem. I have 3 connections, one classic with cable in my box and 2 modem 4G (Huawei E3372H)
I want to make proxy with that (like with ...
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0
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0
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90
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Forwarding localhost to ipv4
I'm trying to forward my octant running on 127.0.0.1:7777 to ipv4 .
I have already gone to /etc/hosts/ and change the localhost to 192.168...
but not working
What else must I do to forward it to my ...
0
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1
answer
39
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Change IPv4 address of my server
I've tried to change de IPv4 address from my Ubuntu Server but when i run the command "netplan apply" an error appear, the error appeared is telling me my gateway isn't a valid IPv4 Address. ...
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1
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1k
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wget connection stuck - log file location? [closed]
A client of mine could not download anything via WGET from any website. He didn't get any error messages in the terminal. The connection simply remained in the "connecting" status. It did ...
- 163
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1
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1k
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How do I use PuTTY to connect through SSH to Ubuntu Server 20.04.3 LTS
I'm trying to connect to my server terminal thru SSH, before at my home everything worked fine, on my Ubuntu server terminal I did ifconfig, get the ipv4 IP address and connect to it. Now I brought my ...
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0
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689
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How do I show all ipv4 and ipv6 addresses by using grep
I'm trying to grep inet addr and inet 6 addr from ifconfig. I can grep inet addr or inet6 addr alone only.
How can I show both IPV4 and IPV6 addresses in one command?
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0
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442
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other interface connected to linux bridge not receiving multicast packet
lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 20.04.3 LTS
Release: 20.04
Codename: focal
Bridge Info
sudo brctl show
bridge name bridge id ...
1
vote
1
answer
1k
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Disable both IPv4 and IPv6 on a specific interface
Using Ubuntu 21.10, SoftEther docs recommend disabling IPv4 and IPv6 on one of the two Ethernet interfaces used for the local bridge network adapter.
Here's my /etc/netplan/01-network-manager-all.yaml....
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1
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2k
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My Ping result are returning an IPv6 instead of IPv4
I am new in Linux. So, I am running dual boot Linux and Windows 11. All my OS is on the latest version. I try to ping google.com in Linux, but I get returned IPv6 instead of IPv4. Here is the ping ...
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1
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681
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XUbuntu 20.04 won't connect to wired router/internet
XUbuntu 20.04 won't connect to wired router/internet using my computer, the live CD, or live CD for 18.x or 16.x. These had worked before without problem. Other computers running 18.x still work and ...
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138
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Ubuntu 20.04 server suddenly can nolonger connect to anything at all on IPv4
... but I can SSH and use webmin on it just fine over IPv4?? I cant ping anything at all and of course DNS just flat fails as a result. The only addresses I can ping are local 127.0.0.xx and the ...
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Ubuntu - ipv4 mostly not working on new install
I just did a clean install of Ubuntu 20.04 on a machine and have been having problems with it. IPV6 works fine across the board, but IPV4 isn't working, mostly.
[EDIT: I'll shorten the question in ...
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143
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ufw is listening to tcp6 on OCI and cloudflare ssl certificate
netstat -ntlp | grep LISTEN
tcp 0 0 127.0.0.xx:53 0.0.0.0:* LISTEN 809/systemd-resolve
tcp 0 0 0.0.0.0:22 0.0.0.0:* ...
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1
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0
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536
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PHP-FPM upstream error with ipv6
I have just installed the latest Nginx with PHP7.4-fpm on a fresh Ubuntu 20.04.2 server.
I added a virtual host that has a WordPress site on it and it is loading fine but I noticed the nginx logs ...
- 345
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2
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1k
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IPV4 Connectivity isn't working, IPV6 working fine
I have set up a Raspberry Pi with Ubuntu Server 20.04 LTS, however I run into some connectivity issues, especially regarding IPV4. It seems however that IPV6 is working correctly.
Here is an example ...
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1
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319
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Can't connect to ipv4 websites, not even when wired
I can connect to google, but not to duckduckgo.
$ ping google.com
PING google.com(arn09s19-in-x0e.1e100.net (2a00:1450:400f:80c::200e)) 56 data bytes
64 bytes from arn09s19-in-x0e.1e100.net (2a00:1450:...
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1
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How to set IPV4 address disabled in Ubuntu 20.04 using netplan?
I am trying to set IPV4 address as disabled. but it is setting a link-local address. Here is my config.yaml. If i apply netplan apply, link-local ipv4 address is set for the connection with ipv4 ...
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1
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633
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No internet access via IPv4, IPv6 works fine
I ran into some troubles with my Ubuntu 18.10 machine. I have changed my ISP a few days ago and
more or less since then I cannot connect to IPv4 websites anymore, nor use any service requiring IPv4. ...
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0
answers
641
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How can I use scp from an ipv6 server to download from an ipv4 server?
I know the -6 option to download from an ipv6 server, the problem is that i'm on an ipv6 server , and try to download from an ipv4 server, how can I do it ?
Here's the command that I use : scp -r ...
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0
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0
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956
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DHCP lease not renewed upon expiration
I'm a clueless newbie running Ubuntu 18 on top of VirtualBox on top of Windows 10 with a wireless connection to my ISP's router. The VM's network adapter is set up in VB as bridged, and is configured ...
1
vote
1
answer
9k
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Destination unreachable: Address unreachable upon ping of outside hosts
Im having trouble pinging google.com on ubuntu 20.04
david@Ptolemy:~$ ping google.com
PING google.com(syd09s22-in-x0e.1e100.net (2404:6800:4006:80e::200e)) 56 data bytes
From 2001:8003:7405:1200:faab:...
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0
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166
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Ubuntu 18.04 Multi Network Interface doesn't work well
I'm running Ubuntu 18.04 LTS on HPE ProLiant DL360 gen9, and I have a trouble on networking.
I write a config for netplan as follows.
network:
ethernets:
eno1:
dhcp4: true
dhcp6: ...
- 11
7
votes
2
answers
13k
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Ubuntu Server 20.04 - Netplan configuration for dynamic IPv4 and static IPv6
TL;DR
Does anyone have a working netplan configuration that sets a dynamic IPv4 and a static IPv6 under Ubuntu Server 20.04?
What works
My provider (OVH) gave me a server with this configuration in /...
- 301
2
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0
answers
2k
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How do I make changes to the file /etc/gai.conf take effect without a reboot?
Per the title, how do I make changes to the file /etc/gai.conf take effect in Ubuntu 20.04 without a reboot? (I altered /etc/gai.conf to force prioritization of 4to6 (IPv4 to IPv6) tunnel traffic over ...
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5
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2
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32k
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Installation of server does not accept subnet CIDR
I try to install a server from scratch with a fixed IP address. For installation I use the provided ISO of 18.04.3 and the installation agent of Ubuntu.
First I thought that my understanding of the ...
- 153
3
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1
answer
2k
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Disable IPv4 on Ubuntu 16.04 LTS
I want to create a pure IPv6 environment or disable IPv4 completely, not just on the interface. If it is impossible, I want to disable IPv4 on boot via the command line or a configuration file.
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0
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1
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295
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Ubuntu Server 18.04 LTS - Unable to change IPv4 settings duing setup
During setup on Ubuntu Server 18.04 LTS, I have problems setting up manual IPv4.
I'm enter the following:
Subnet: 255.255.255.0/24
Address: 192.168.0.50
Under address I get the following error:
'...
user1006198
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0
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1k
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Connection Failed: Activation of network connection failed
I have Ubuntu 18.04 running on VirtualBox 6.0.4 and I am trying to connect my Xbox one s to the internet via Asix Ethernet adapter. I connected ubuntu to my network but the ethernet connection between ...
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1
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0
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301
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Ubuntu Server 18.04 no IPV4 after resume
I fail to get ipv4 working on an ubuntu server 18.04 after it was suspended and resumed. The only way I get ipv4 running again is reboot. The system is installed as a guest in a vmware virtual machine....
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4
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0
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Need to configure XRDP service to listen using IPV4 not TCP6 [duplicate]
I have installed xrdp on ubuntu 18.
xrdp by default listens to 3389 so that it can support Window RDP
When I run "netstat", it shows that
the service is listing with tcp6 and IPV6 syntax (colon ...
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24
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6
answers
68k
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IPv6 is working, but IPv4 isn't
I've got a new laptop running Ubuntu 16.04 that worked like a charm for a couple of weeks but has now lost its appetite for connecting to the internet via Wi-fi. I know it's not a problem with my ...
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2
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1
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1k
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What does the @ sign mean after a tunnel interface?
I previously asked a question on setting up a ipv4 to ipv6 tunnel.
I answered my own question and this is configuration output from my previous question here https://askubuntu.com/a/992872/13903
4: ...
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703
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Can connect, but no internet on Ubuntu 16.04, works fine on windows 10 (IPV4/IPV6 problem)
I am having problems with my internet connection on Ubuntu 16.04. I can connect to the wireless network but i have no access to internet,
In my laptop i also have windows 10 and it can connect and ...
1
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1
answer
1k
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Running IPv4 only application on IPv6 only network
I have an Ubuntu 16.04 machine connected to an IPv6 only network. One application I want to run on this machine appears to not work properly with IPv6.
I know 464XLAT is supposed to make such ...
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15
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3
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26k
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How to disable IPv6 on Windows Subsystem for Linux?
I tried to disable IPv6 by adding in /etc/sysctl.conf:
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv6.conf.lo.disable_ipv6 = 1
and then running sudo sysctl -p to ...
3
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1
answer
4k
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Using UFW, if I create a rule, will it apply to both IPv4 and IPv6? [closed]
Will UFW create the appropriate rules in both iptables and ip6tables?
0
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1
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1k
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How to get IPv6 ip from the router, what is my subnet mask?
This is the router asking to put an address but when i insert 192.168.0.2 it fails what is the IPv6 value for that to setup in the router? So that i get proper IPv6 in Ubuntu?
In Ubuntu from the ...
user25165
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1
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457
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Apache2 server not responding with IPV4 address
I run an apache2 web server on Ubuntu 14.04 that I use to save files from my laptop with Owncloud.
I used to be able to connect via HTTP using my external IP address (IPv4), and I used that public ...
2
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0
answers
310
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How to verify that IPv4 is disabled on a machine?
Running a 16.04 VM and disabled IPv4 in Network Manager but I'd like a way to verify that IPv4 isn't being used.
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