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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14 views

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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278 views

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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set IP address as static in Windows

I have a Windows 2016 FULL STD 64 bit server. I need to activate its public IP to make the server reachable for a scan. I will follow these steps, but I don't know how can I register my current IP as ...
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Assign an IP address to each router’s interface

I have to assign an IP address to each router's interface. This is the network: You can find the network design here This is what I have: N1 is a private network with 1000 hosts: 192.168.0.0/22 N2 ...
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1answer
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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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1answer
17 views

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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4answers
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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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53 views

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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Is it possible to deploy NAT64 gateway on shared IP vServer?

Is it possible to setup a NAT64 gateway (e.g. Jool, WrapSix) on a vServer which has a shared IPv4 address (192.100.100.100:20000-20020)* and normal IPv6 address? *The vServer's IPv4 address consists ...
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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 ...
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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 ...
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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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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? ...
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29 views

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 ...
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Discarding A record responses - when querying a DNS entry returns both A and AAAA records

I have a linux system with both IPv4 and IPv6 addresses. I want to reach an external system by way of a DNS entry. This DNS entry returns both IPv4 and IPv6 addresses (A and AAAA) Is there ...
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Unable to talk to new Server 2019 from remote locations on different IP addresses

We have a client who has a number of offices connected via IPVN Broadband connections. - IP Address Range below A new server (Server 2019) at the main office cannot be seen by the outer offices. ...
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1answer
40 views

Use network and boradcast IPv4 addresses for normal unicast traffic

Given the current exhaustion of IPv4 addresses, I would like to try to use the network and broadcast address of by /29 prefix. Is this possible? I am renting a /29 from Hetzner and assign the ...
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1answer
743 views

Finding all Public IPv4 and IPv6 addresses in a UNIX shell script

For monitoring purposes, I'd like to find out all public IPv4 and IPv6 addresses of a mobile-warrior UNIX box. Note that this is different from Finding the Public IP address in a shell script because ...
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1answer
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Under what circumstances IPv4 conntrack drops packets?

I always thought that IPv4 Connection Tracking ( a.k.a. conntrack ) is a passive module, that just reads packets and tracks them, so later other modules can use that collected information to decide ...
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IPv4 Addresses and AWS Elastic IP [closed]

So, the world is finally out of IPv4 addresses. It's been expected at least since I've been to college in 2004. But how is it that AWS have so much of this precious product, that they can give them ...
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1answer
100 views

Can UFW do port forwarding of IPv4 to IPv6

I have an http/https server which is IPv6 only. To allow people who have IPv4 only to reach it I would like to use a server in the middle with IPv4 address and forward traffic to the IPv6 server from ...
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1answer
101 views

Why IP address overlapping occurs in IP forwarding table?

My understanding of an IP forwarding table is that they have a listing of different networks (identified by their IP ranges) and connects it to the next-hop router. However, I'm surprised why two ...
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2answers
619 views

Can all people reach an IPv6-only website?

My webserver only has an IPv6 address. My provider does not offer any IPv4 addresses. I don't even get a dynamic or temporary IPv4 address. Is it possible that some users may not be able to reach the ...
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1answer
717 views

Use IPv4 on IPv6-only machine (through SSH tunnel?)

Our non-IT company uses a IPv4-only webservice which only allows access from our (whitelisted) IPv4 ip. This ip is assigned to one of our VPSes (this VPS also has a IPv6 assigned to it). We usually ...
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2answers
106 views

AWS bring your own IP

I am a newbie to AWS. I understand there is a feature to move our own IP addresses onto AWS. So, any existing IP based restrictions don't have to change. I have a need for a new service to be deployed ...
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How can I maintain a secure automated recognition relationship with remote web servers when comcast keeps changing my IPv6 and IPv4 addresses? [closed]

It used to be that one's IPv4 would stay the same for months at a time. Now, however, it seems they like to renew your IPs on a near daily basis. Previous to these shenanigans, during development of ...
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Using .0 ip on a routed /24 IPv4 subnet

After routing a full /24 subnet to a single server it's possible to configure the server to listen to any IP from the subnet without reserving IPs for the subnet itself or for the broadcast IP. ...
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1answer
46 views

Router sharing same IP address between parent and subnetwork

Suppose this hypothetical scenario: I have a parent network 192.168.0.0/16 and a subnetwork 192.168.42.0/24. I have a router with two network interfaces in between, whose address in the subnetwork is ...
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1answer
44 views

name based ipv4 to ipv6 gateway

Supposing I have a dedicated server at host.com with an IPv4 address 1.2.3.4, a statically assigned IPv6 address, and an ample supply of additional IPv6 addresses. This host is serving multiple KVMs ...
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1answer
38 views

How to route a file to specific gateway?

I have Windows 8.1 Enterprise I am connected to two internet connections on my PC with this gateways: 192.168.1.1 = my isp gateway 192.168.43.1 = my mobile usb tethering gateway Now I want ...
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NFS/SMB - cluster phenomen (blade center / synology / multi nic)

I hope someone can help me as we have in the company a strange issue and not even our network experts have an idea. The setup: We have a hyper-v cluster hosted on 16 blades in a HPE blade Center/...
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1answer
66 views

Using VLAN, IP A shows (and uses) also raw-device addresses

Setting up a cluster with a private IPv4 VLAN, we have the following problem: IP A says: 3: eno1.4000@eno1: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1400 qdisc noqueue state UP group default ...
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3answers
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In IPv4 Subnets - a /23 - How do we know which range to use? [duplicate]

Let's assume I don't know what my IP range is, or my default gateway, but I know my IP address is 192.168.5.38 and my CIDR Range is /23. How do I know what my IP range is? Is my range 192.168.4.0-...
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Windows 10 dual-stack IPv4 / IPv6 client assigned both IPv4 and IPv6 DNS servers, how does it decide which to use?

I have a Windows 10 dual-stacked client receiving both IPv4 and IPv6 DNS server addresses. The IPv4 DNS server is assigned with "regular" DHCP, while the IPv6 DNS server is assigned with a stateless ...
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Embedding 3 bytes custom data in IPv4 header and then filter by iptables

In my modified OpenVPN server process, as an intermediate node, I'd need to embed my custom 3 bytes data in the header of every IP packet and then in the same machine (after going through tun) filter ...
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1answer
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Add range of IPs to a firewalld zone

I'm struggling with the syntax for the following. If I want to add a single IP to a zone, I do this: firewall-cmd --zone=drop --add-source=134.119.193.63 But, how would I add 134.119.xxx.xxx? ...
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1answer
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2 VM can not connect via external IPv4

I use Proxmox VE (Debian) for my VM. In order to reach my KVM computers externally, NAT is used with port forwarding. Unfortunately, no VM can connect to the external IPv4 of the host. But all VMs ...
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Sage 50, Pervasive PSQL, and IPv6

After installing Sage 50 in a client/server configuration, Sage 50 failed to start on the client workstations. The Sage 50 application window briefly opened and then closed without displaying an error ...
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NGINX get IPv6 address in X-Forwarded-For Header

I use NGINX as a reverse proxy. I am interested in getting the users IPv6 address (if used by the provider) in the X-Forwarded-For header. For IPv4 this work s automatically. I have seen the doc at:...
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666 views

Ubuntu 16.04 LTS - DHCP deliver IPv6 but not IPV4

I got a Ubuntu Server 16.04 LTs, it's a VM on a ESX (VMware). This server was in dhcp config and it worked fine until today. (I know a server should be in static address but in my case, i don't really ...
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458 views

FreeSWITCH Dual Stack IPv4/IPv6

I'm currently trying to understand how I can enable my freeSWITCH to talk both IPv6 as well as IPv4. Currently, I thought it was going to be easiest to first create a set-up which works on IPv4 and ...
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1answer
90 views

What issues would arise if I decide to move my local network to IPv6?

I am managing a small corporate network, and actively investigate the possibility of getting rid of IPv4 entirely, at least on the LAN level. I intend to disable IPv4 DHCP and connect to each machine ...
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1answer
363 views

VPN cant connect to ipv4 server through isp which has ds-lite

my Problem - I can't connect with my Windows 10 to my work VPN via SonicWall Mobile Connect. what do I know - If I use my mobile hot spot it works but not when I use my Cable connection (over ISP) ...
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1answer
113 views

Debian Stretch IPv6 prioritization

I have a Debian Stretch system with both IPv4 and IPv6 addresses and default gateway. IPv4 and IPv6 addresses in the internet are reachable. When I start a ping to a domain which has an A and AAAA DNS ...
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1answer
29 views

How to scan for (erroneous) static IP configurations within DHCP server scope

How can I scan for any statically configured IP addresses in use, within a Windows Server DHCP scope, of which the DHCP server is not aware? I'm dealing with a network I inherited on which I found ...

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