Questions tagged [ipv4]

Refers to the 4th revision of the Internet Protocol, where addresses are usually displayed in the form of dotted decimals between 0-255. Ex: 169.254.0.1

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How does a node differentiate between an IPv4 and IPv6 datagram? [closed]

In a computer network, how do hosts and routers tell if a datagram is IPv4 or IPv6? Do they just look at the version number field of the packet header?
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iptables -> ip6tables (convert)

I have the following iptables (ipv4) and need the same on ip6tables (ipv6) for an openVPN-Server: # Flushing all rules iptables -F FORWARD iptables -F INPUT iptables -F OUTPUT iptables -X # Setting ...
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What is the name of an IP prefix with prefix length 31? (i.e. contains only 2 IP addresses)

At my job, IP prefixes with prefix length 31 (i.e. they only fit 2 IP addresses) are commonly described at "linknet addresses". Lately I have noticed that this term doesn't appear to exist ...
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Make Windows listen on specific IP

I currently have the following problem: We currently have a cloud server configured to accept connections via a remote Site to Site tunnel. The connection is established, and the traffic from the ...
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Is the network part of an IPv4 address unique? [closed]

I get that an IPv4 address can be subdivided into two parts, the network part and the host part. In my private home network, is the network part publicly unique?, i.e., may other people have the same ...
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Using 'netsh interface ip set address' to override another adapter's address?

I'm one of the developers of the OpenConnect VPN client. We're trying to modernize and improve our support for Windows. We use a user-customizable JScript called vpnc-script-win.js to configure IPv4/...
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Ubuntu Server 20.04: IP address in use

I have a bare metal dedicated server with a UK hosting company. They have an automated system which keeps blocking my server because they claim that I am using an unauthorised IP address. The IP ...
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Fresh Ubuntu 20 server getting wrong DHCP address

I need to setup a new Linux server on VirtualBox, I'm using Ubuntu Server 20.04 LTS and in Virtualbox my network adapter is set to bridge adapter with promiscuous mode on "allow all" First ...
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DHCP collision on two subnets in same domain

I'm trying a VLSM scenario with my 2 consumer routers. R1 has GE and R2 has FE. Both has internal switch (br0) since they are home routers. First simplify things with fixed masks. R1 on 192.168.1.1/25 ...
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Get-NetIPInterface property 'Dhcp' is 'Enabled' after setting static IP configuration with netsh

The Question Set a static IP configuration with netsh: netsh interface ipv4 set address name="Ethernet1" static 192.168.0.20 255.255.255.0 192.168.0.1 netsh interface ipv4 set dns name="...
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Why can't my internal IP addresses be granted access from IIS 10 IP Address and Domain Restrictions?

Why can't my internal IP addresses be granted access from IIS 10 IP Address and Domain Restrictions? Backstory: I have implemented IIS 10's IP Address and Domain Restrictions to block access to one ...
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Squid in dual stack ipv4 / ipv6 reaching out for services only served on ipv4 interface

I am running a dual stack network and am running a server there (Squid, Apache, DHCP, Mail,...). The network is working properly. However not all services running on that server provide a listener on ...
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Make Docker listen to the IPv6 address of server, forward IPv6 requests to right container

My server is running on both IPv4 and IPv6. Docker is running on (local) IPv4 addresses (ie 192.168.100.1/24). I did not enable IPv6 inside daemon.json as I understand that to be rather buggy and ...
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Redhat 7 - IPv6 does not configure correctly on server bootup, only after resetting interface

we have some RedHat 5 servers which are running IPv4 and IPv6. We are migrating to RedHat 7 and using a similar ifcfg file. When the RedHat7 comes up after a reboot, all of the IPv4 IP's are ok but ...
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How to tag IPv4 and IPv6 packets with different VLAN tags on a Linux box?

I want to tag incoming IPv4 and IPv6 packets from a dual stack enabled connection with different VLAN tags, e.g. IPv4 packets should go to VLAN4 and IPv6 packets should go to VLAN6. To be more general,...
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ping returns IPV6 address on ubuntu 20.04

I have installed GitLab on a cloud VM and shortly after stood up a second VM as a postfix server with the same provider (Hetzner) I first noticed a problem when I went back to the GitLab server to ...
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AWS EC2 Instance Public DNS includes IP address

My AWS EC2 instance's public DNS has the public IP address in it separated by -. For example: ec2-x-xx-xxx-xxx.ca-pacific-x.xxx.amazonaws.com. Now, my question is when I give my users this DNS, is it ...
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Why does setting MTU 1452 solve Internet problems and how to fix root cause?

In our church we get Internet uplink from a friendly neighbor’s WiFi. At first everything seemed (at least) fine but since some weeks general “Internet stability problems” increased and since approx. ...
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Is it possible to check that given IPv4 and IPv6 belong to the same NIC?

Given an IPv4 and an IPv6 address of a machine and only access to the public services it provides, is it possible to check that they are assigned to the same network interface controller? Assume the ...
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Are there issues if you run a IPv6 private network with IPv4 values and an empty prefix?

So i recently found out that the last 32 bits of an IPv6 can be addressed by their decimal value (not universally, busybox ping doesn't). So your IPv4 network is 10.0.0.0/8 and your IPv6 is ::10.0.0.0/...
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Synthesize A records when only having AAAA [closed]

I'm hosting some things from my home network and my ISP doesn't provide me with an IPv4 address. Not with a way to port forward to it anyway. I've got my servers running using IPv6 and everything ...
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Azure: Difference between IPv4 and IPv6 single IPs versus bundle

I want to assign public IPs to my services (IPv4 and IPv6 are needed) but I can choose to either: Assign a dedicated IPv4 Address Assign a dedicated IPv6 Address Assign a bundle - of an IPv4 and IPv6 ...
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Is it possible to create an Elastic IP address from the current IPv4 address of my ec2 instance?

I currently have an ec2 "t2.nano" instance up and running. I would like to switch to a "t2.micro". In order to do that, I need to stop the instance. But I would lose my IPv4 ...
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Iptables - port forwarding issues

I use a CentOS 7 as a gateway server. It has two network interfaces, ens28 and ens29. The ens28 uses a private 192.168.x.x network, it is considered as the WAN. Ens29 is the LAN area with a 172.16.0.0 ...
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My public IP is IPv6, but I thought I had a static IPv4

I have a commercial, small business service from COMCAST which includes I think 4 or 5 static IP addresses. I have one computer that is wired directly into the COMCAST modem and statically configured ...
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IPv4 Address Range Shortage Inquiry

Recently I was looking over RFC6890 (link here) to find out more about the current IP addressing schemes that are in place and noticed a rather large IP address range that is listed as "Reserved ...
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Can i use a proxy from ipv6 to ipv4

Suppose i have an ipv6 internet address. Is it possible to connect to a ipv4 proxyserver. I have been trying this scenario from ipv4 which works perfectly, but not with ipv6. Could this be the cause?
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Is there a global shortage of IP addresses or not? [closed]

This is bugging me a bit, so would like some help. Here's some data I've gathered: Apparently, an IPv4 address can range from 0.0.0.0 through to 255.255.255.255, providing up to 4,294,967,296 unique ...
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148 views

Banning an IP address

I banned an IP on my server, but I'd also like to ban using the CIDR method, e.g. IP/24. My questions are: How do I find the CIDR range of the IP address. When banning the range, if the user has a ...
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Confused about routing and netmasks

I'm having some issues with OpenVPN and multiple VPNs. Not earth shattering, but after bringing up a combination of VPNs I didn't intend to I've ended up in a situation I don't understand. Looking at ...
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Why 224.0.0.1 traffic is filtered by Linux hosts?

When sending an ICMPv4 echo request to a destination address like 224.0.0.1, it is ignored by Linux hosts receiving the request. The destination MAC address used is 01:00:5e:00:00:01. The only way to ...
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confused about CIDR interpretation

I am beginner in networking and trying to understand subnetting. What I understood is that CIDR notation (Classless Inter-Domain Routing) is an alternate method of representing a subnet mask. It is ...
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Is it possible to have 2 public ip addresses?

I have 2 Minecraft servers hosted on one computer, but I wanted to assign them both 2 separate domain names. Is it possible to assign 2 IP addresses to the same computer so that one server could be ...
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Cannot display default NGINX page

I just installed Ubuntu 20.04 on my server. I also installed Nginx. My problem is that the default sie Nginx page is not displayed. Yet UFW is not activated. Do you have an idea of the problem ? This ...
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Removing IP address from server takes down unrelated website

I'm working with a Windows 2008 Server running IIS. One of the websites running in IIS was migrated to another server. As a result, I shut down that site in IIS on the Windows 2008 server. There weren'...
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Can't ping host with two interfaces

I am trying to figure out why a network interface is not pingable and is returning an ICMP type 3 code 1 response: Destination unreachable (host unreachable). I am trying to ping from host1 to one of ...
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Why would hostname -I report 3 IP addresses?

Environment: Fresh install of CentOS 8, Digital Ocean Droplet Question: Why would hostname -I report 3 IP addresses? Shouldn't it show 1 IPv4 and 1 IPv6 address? My Output: (IP addresses changed) ...
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What may cause a request being sent with a TTL of 64 to fail on connection to a destination ip that traceroute shows is 33 hops away?

From within a docker container (running ubuntu 18) running on AWS ECS I'm attempting to establish a connection to an outside data center. We've troubleshot the issue to where we believe it's the ...
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In small network, how to provide ipv6 addresses in existing ipv4 subnet?

I have an ip4 192.168.0.0 subnet, with a few dozen hosts, and 6 or so servers with static IPs. I use bind 9 (On Centos 7) internally to service ip4 DNS requests. For years, I've disabled ip6, because ...
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How to add IPV4 range to unmanaged server

I am really inexperienced with Linux and networking. I bought an unmanaged dedicated server running ubuntu 16.04. I am having problems with binding the ipv4/24 range with my dedicated server. How ...
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Ping Hyper-V Virtual Switch IPv4

I wanted an IPv4 service running on the Hyper-V host that only the VMs can access via a Virtual Switch. Hyper-V Server 2016 (removed IPv6 public prefix) Ethernet adapter vEthernet (Public Switch): ...
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Generate DNS zone redirecting subdomains to IP subnet

I created DNS zone as in example below. Is there another, clean way to redirect subdomains to IP address? Maybe with bind9 $GENERATE? Can I use regex or iteration with existing DNS software? Where to ...
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Routing Internet Traffic through VPN tunnel

I am relatively new to the topic, so please do not mind if I ask simple (or stupid) questions. I own a Raspberry Pi 3B and installed and configured an OpenVPN server on it. Therefore I followed this ...
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Kubernetes cluster not working after setting up IP forwarding

I am doing a research project and our end goal is to essentially construct a kubernetes cluster using several Raspberry Pis. I've included the fact that we are using Raspberry Pis for reference, but I ...
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Disparity of allocated IPv4 addresses between US and China [closed]

According to IPinfo.io, United States has 1,103,394,048 IPv4 allocated addresses, while China only 342,840,576, despite having four times more population. Is there any legal/historical/technical ...
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Redirect IP to other IP

Good Evening everybody! we have moved our website onto another server. Previously it was hosted on AWS. Now we are having the issue that we do not have access to our DNS settings due to some ...
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nginx - how to redirect depending on a range of IP addresses?

I am trying to make a site only accessible from within the local network and people from the external network will get a static page saying some other message. This is what I am trying to do but it ...
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1answer
149 views

How to add ipv4 capability to ipv6-only-vserver?

I have an ipv6-only-vserver and a dual stack (ipv4-ipv6) server. How do I "add" ipv4 capability to the ipv6-only-server? So it's possible to "use" it like a ipv4 server: ssh/scp into the vserver via ...
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299 views

Proxmox IPv4 inward routing not working

Yesterday I realized that one of my LXC containers on a Proxmox server needed to access github.com, therefore I had to add IPv4 support (really Github?). I added a /29 subnet to the internal network ...
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uidrange iproute2 not working

I'm trying to setup routing based on uidrange, and I seem to keep hitting the same issue. $ whoami yawnt $ id uid=1000(yawnt) $ ip rule list 0: from all lookup local 32765: from all uidrange 1000-...

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