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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What Ubuntu component is taking down my IPv4LL and how do I stop it?

I have a workstation running Ubuntu 20.04 LTS. I plug an embedded-linux device into it ethernet-port-to-ethernet-port and they are supposed to self-assign IPv4 addresses (although I have to use Linux ...
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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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IPv6 does not work with my 4G modem

I'm using Verizon Usb551l 4g modem on Ubuntu 20.04.1LTS and it works great however when I try to switch IPv4 to IPv6 the Internet connection stops working. I'm not sure why it does not work on Ubuntu, ...
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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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Ubuntu 20.04.1 Losing connection (Ip settings)

I am renting this Virtual private server with Ubuntu. Recently i upgraded from ubuntu 19.04 to 20.04.01. I am running two webpages on this VPS, since i upgraded to 20.04 the server is losing internet ...
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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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Problems With Primary DNS

First, I'm a novice user on ubuntu. I'm sorry for asking such a basic question. I'm configuring a Wired Connection with manual IPV4 settings. In Primary DNS, i configured the router address (192.168.X....
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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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1answer
2k views

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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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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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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2k views

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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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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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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1answer
966 views

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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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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1answer
958 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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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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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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1k views

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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352 views

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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197 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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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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2k 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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2answers
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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670 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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1k views

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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2answers
3k views

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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1answer
922 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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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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107 views

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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364 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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4k 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 ...