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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

The IP address of a device is its unique identifier on a network which allows communication with that device.

Given the fact that only 2^32 IPs are available, number which is already depleted, its successor (IPv6) has officially taken over on 6 June 2012.

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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 maintenance works which take quite some time... But we do…
David Eisenmann
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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 ipv4 using webdav/sftp/http/xmpp/... via ipv4 use…
user3200534
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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 behind the vmbr0 interface. However, routing of…
Sven
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using 192.170.130/24 as a subnet on the LAN

We have a client who has a 192.170.130/24 subnet on their LAN, which is being NATed to the WAN IP address from their ISP. Is this a good idea or should they be using an RFC1918 addresses on their LAN? Thanks
user242114
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Use local interface address for firewall rule

I'm setting up a firewall for a connected device running Linux. It has a wired/wireless interface to connect to the internet in general and to open a VPN tunnel to an external server. For security reasons, outgoing traffic should be firewalled as…
Philipp Burch
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IPTables NAT Ubuntu redirect 2nd IP to another IP

i have got two servers : Server 1: IP1= 8.8.8.1 IP2= 8.8.8.2 Server 2: IP1= 8.8.8.3 i want to redirect every access to IP 8.8.8.2 to 8.8.8.3. Therefor I activated IP forward sysctl net.ipv4.ip_forward=1 and installed the IP Tables: iptables -t…
user154501
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Cannot ping 'server' after it reboots, how can I fix this?

The company I work for is using a Dell OptiPlex Micro PC (running Windows 10 Pro) as a server for some intranet resources (MS SQL Server databases and network licenses for some software). It also hosts a .NET framework web application that I wrote…
Rhydgaled
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AD client won't getIP address from DHCP server

Server is running Windows Server 2016. Client has Windows 8. Unless my client has a static IP address, it cannot communicate with the AD. My DHCP server won't give my client an IP addresses, and I don't know why. I want my DHCP server to…
Muroxxas
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How to do Fixed length subnetting?

This was an exam question last year, and I was trying to figure out how to get the answer: A small company is assigned the class C network 205.67.35.0. You need to divide this network to provide subnets for three departments using fixed-length…
User14981
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Ip4 and Ipv6 Default Gateway

We occasionally restrict internet access on some of our test servers by just quickly removing the default gateway. With the introduction of Windows Server 2016 we decided to test a few of its features and again remove the Default Gateway; although…
dqnet
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VPS ip address blocked

I have a Debian based VPS which runned fine until recently. Yesterday, i was working at programming websites when the server just didnt respond anymore. I have done some research and to be short, right now it does respond when I access it with the…
Hendrik Hamming
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Building router with one ethernet interface

Good day! I have 2 servers in datacenter and I want to use one of them as router for another instead of default gateway provided by DC. Both servers have one ethernet interface called 'eth0' with public IPv4 and IPv6 addresses and both servers are…
George Gaál
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IPv4 SYN, ACK & RST issues

Good day, I asked this question in the Network Engineers StackExchange and was told to ask it here. I am running a roundup server (Ubuntu 12.04) and the roundup-mailgw (python script) is no longer able to pull email from MS Exchange to create the…
Lee
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Priority of dhcp servers

Let say there is a main Server which is assigning ips by dhcp to 50 different LAN ports in network.Now if at some LAN port we connect a small router on the yellow port(so that all other devices come in network)dhcp enabled,then it will also act as…
Merox
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Is there a Universal/Generic Default Gateway Address in IPv4?

Is there a universal and/or generic default gateway address in IPv4? I'm looking for something similar to the way you can always reference a NICs IP address from itself with 127.0.0.1 regardless of any other factors, making deployments much simpler…
Giffyguy
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