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.

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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 ...
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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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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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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 ...
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Internet doesn't work on specific network after connecting to enterprise network

Ubuntu 20.04 LTS Everything worked flawlessly before. Connected to a WPA2 Enterprise + PEAP + MSCHAPv2 network at work. After that, WPA2 Personal network stopped working at home. It authenticates ...
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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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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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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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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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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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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 ...
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2 answers
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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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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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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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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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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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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 ...
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1 vote
1 answer
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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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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: ...
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6 votes
2 answers
10k views

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 /...
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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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3 votes
2 answers
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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 ...
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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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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: '...
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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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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 votes
0 answers
4k views

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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18 votes
5 answers
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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 votes
1 answer
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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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1 answer
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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 ...
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1 vote
1 answer
1k views

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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12 votes
3 answers
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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 ...
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3 votes
1 answer
3k views

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?
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0 votes
1 answer
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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 ...
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0 votes
0 answers
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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 ...
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2 votes
0 answers
274 views

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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3 votes
0 answers
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How do you disable IPv4 on 16.04

I'm trying to disable IPv4 on a system I'm working on to check how a project interacts over purely IPv6. Does anyone know the following: How to disable IPv4 (and verify that it is indeed disabled) ...
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2 votes
2 answers
3k views

Fresh Ubuntu install unable to connect to IPv4 addresses

I just recently made a fresh install of Ubuntu 16.04 on my newly built desktop. However I'm having some internet connectivity issues. Please bare with me as I am a linux noob. Anyway, I'm unable to ...
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2 votes
2 answers
4k views

Where is the "automatic (DHCP) addresses only" option in network?

I am trying to change my DNS to Google Public following these steps. However, my IPv4 settings lack this option. Why is it missing?
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-1 votes
1 answer
731 views

Static ipv6 on Ubuntu

I need to create a virtual machine with Ubuntu, setting static IPV4 and IPV6 address. It is working, however, I always have an extra IPV6 address, that I want to get rid of. I set everything in etc/...
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Have to use -o Acquire::ForceIPv4=true to do apt-get update/upgrade

I am looking for an other workaround to my problem that apt-get upgrade/update/install wont work via IPv6. I cant use the software center neither can I use the system update center for anything. I ...
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-1 votes
2 answers
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How i can disable ping request in Ubuntu 16.04?

I want to disable ping request in Ubuntu 16.04 through Terminal. So another host in the network can not know about my system.
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2 votes
1 answer
963 views

Disable ipv6 in ubuntu 14.04

I found that post How to disable IPv6 on Ubuntu? I need to ask about this file /etc/default/bind9. I couldn't find this file. Where can i find it?
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0 votes
2 answers
2k views

Cannot read the changes in net.ipv4.ip_local_reserved_ports

I'm new to Ubuntu and I tried to edit this file net.ipv4.ip_local_reserved_ports but cannot read changes. I got empty after I checked the file again.
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0 votes
1 answer
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Configuration of static IP address

I used the link to set-up configuration of IP address but I got this Failed to bring up eth0 command I used: sudo ifup eth0 configuration is # The primary network interface auto eth0 iface ...
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0 votes
1 answer
386 views

bind before connect

i'm new to ubuntu and networking Is there a method in Linux to check how many ephemeral ports are left available? I've problem with "Address already in use" errors as a result of running out of ...
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2 votes
2 answers
5k views

How to enable IPV6 packet capturing in WireShark at the same time as IPV4?

I am running Ubuntu 15.10 with GNOME 3.18, and for some debugging work need to capture IPV6 packets going to and from a specific port, however I understand that by default IPV6 packets are not ...
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