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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

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Specify different broadcast IPs for different Windows machines

I run some high-frequency trading software from home across multiple accounts. Sometimes during very volatile conditions, I run into issues with rate limits restricted by IP address. I was assuming I ...
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-1 votes
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How to use IP pool [closed]

I am just beginner, I just want to setup my mini data center and for testing i get a FTTH connection and /30 ip pool, ISP reply is something like that, "IP Pool 103.15.xx.xx/30 has been assigned ...
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Centos7 server that has no IPV6 assigned to it, can't read IPV6 ips in access log

I'm using CentOS7, nginx as a reverse proxy and apache web server. This server doesn't have IPv6 assigned to it, therefore there is no IPV6 in the NIC. This server hosts several websites. When I check ...
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IPv4 fragmentation and high speed data

Please excuse me if this has been answered before, but I couldn't easily find an answer. My company creates high-speed measurement equipment, that produces roughly 0.7 Gigabit/second of UDP data. Each ...
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0 votes
2 answers
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Service bound to ipv6 on linux machine - Can I disable IPV6 and access service on my IPV4 address?

I am attempting to install Tableau Server on Ubuntu 18.04 and have the management service running on port 8850. I am unable to access the service at that port on my IPV4 address as it seems to be on ...
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1 answer
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What does exactly break with double NAT?

There are many warnings about double NAT networks. DSL---modem with router-----second router configured by ISP inner network first NAT second NAT What will exactly break ...
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-3 votes
1 answer
451 views

What is the IPv6 equivalent of 127.0.0.1 [duplicate]

The IPv4 address 127.0.0.1 is for the local/current client. What is the opposite of the address in IPv6? I already searched for it, but only found ::1. Is this the correct one?
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what ipv4 packets normally carry IP options

What packets normally carry IP options? Is it packets with some routing information, e.g. ospf or bgp, or it could be any arbitrary packet, and thus the presence of IP options is determined by an ...
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Force DHCP client to use only IPv4

I have Linux client (running systemd-networkd, version 244), and I want to configure it's network only with IPv4. However, the DHCP server offers both v4 and v6. Is it possible to limit the client to ...
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narrowing down the cause of a VOIP latency issue

I am suffering from an issue where as a call increases in time I get more and more audible latency. on the server side I was told to run ss -4 -l -n | grep udp (which I think is the same as ss -4 -l -...
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0 votes
2 answers
151 views

Why will Firefox resolve my domain but Chrome will not

I've been setting up a LAN DNS server using DNSMasq to forward my webserver which at the moment has https and is port-forwarded by my router. I have a domain registered which resolves fine from ...
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9 votes
3 answers
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IPv4 Properties Settings for servers on an isolated network?

I have a question related to servers which will not have any outside internet connection. The topology is very simple : I have an example IP address of 10.10.10.10 for the server and the workstations ...
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-2 votes
1 answer
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Packets sent in IPv4

I'm just trying to understnd how packets work. So if i hypothetically had a image of a size of 1mb which is 1,000,000 bytes and the maximum packet size for a IPv4 packet is 65,536 bytes does that mean ...
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1 vote
1 answer
1k views

How to fix, ubuntu not getting ip address on hyper-v?

I am using hyper-v as a hypervisor and installed ubuntu 21 on it. There, whenever I start the VM, the eth0 (only one network interface connected,Default Switch of Hyper-v) is not getting IP and ...
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1 answer
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IPv6 vs IPv4 available subnets - enough or too less

I read a bit about IPv6 and found that usually you get assigned a /48 prefix address. Which gives you 16 bit for subnetting. Reading further assuming that you use /64 subnets you would end up with ...
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4 votes
1 answer
960 views

Which ICMP types (v4/v6) should not be blocked?

I have made a lot of research into this and have found that some references contradict each other. IPV6 For example RFC4890 says the following types should be allowed for optimal functionality: Type ...
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1 answer
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How to proxy ftp connection between IPV4 server to an IPV6 client and vice versa

We have a gateway solution which connects legacy RADIO's having ftp server running with IPV4 interface to DU's running with IPV4 ftp clients to do file upload and download operations. And currently we ...
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1 vote
2 answers
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Whitelist both IPv4 and IPv6 in AWS Security Group

I am setting up an SFTP server, I want to white list all the IPs in the Security Group so people can connect to it from anywhere. At the moment I am adding 2 rules to the Inbound rules, one rule for ...
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0 answers
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Is there a way to disable ipv4 fallback in squid proxy

Is there a way to disable ipv4 fallback in squid, i will only use ipv6 outgoing address but if e.g. site is accepting only ipv4 squid fallback to ipv4 i will no fallback.
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Cannot ping two computers with each other on the same switch. (Newbie)

I am an absolute 0 in network science and I would like to understand it a little bit. We have an offline machine connected to a switch, which is also connected to a series of other hardware that ...
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-1 votes
1 answer
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How can I disable IP forwarding from IPv6 toIPv4

I have IPv4 and ipv6 addresses on my network card, when I send a request with curl I want only the respective IPv4 or IPv6 to be used and no fallback e.g. When IPv6 to IPv4 takes place. curl --...
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0 votes
2 answers
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Why does facebook only have 2 IP addresses? [closed]

In the process of setting up DNS for my own website I got curious about looking up a large company's DNS record. I chose facebook.com and used dnschecker.org to view their dns record. Ignoring AAAA ...
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0 votes
2 answers
292 views

About 198.18.0.0/15 segment

What exactly is the use case of 198.18.0.0/15 segment As per whois records, this segment is reserved as depicting below - NetRange: 198.18.0.0 - 198.19.255.255 CIDR: 198.18.0.0/15 NetName: ...
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1 vote
0 answers
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Are their public IP ranges which don't belong to any country?

I've been working on project and we use IP geo-location using an API to identify user's country. The legacy code has an edge case when there is no country information for a particular IP. I have been ...
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How to blacklist the "prefix" of IPv6

With IPv4 it is pretty easy to blacklist IPs since it's not cheap to get new IPs and they are limited. However, with IPv6 it's pretty easy/free to generate a huge amount of unique IPs and it's pretty ...
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1 vote
1 answer
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How to better understand IPv6 to block requests

With IPv4, whenever I realize any strange requests coming to my server I can easily block the IPv4 from further requests (I can block on my iptablets, or in my .htaccess file...). However with IPv6 it'...
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1 answer
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Link-local IPv4 network scope on Windows

We have an embedded PC that initially starts off life with a link-local IPv4 address, typically 169.254.0.1. It broadcasts its existence using Zeroconf using the python-zeroconf library. These ...
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2 votes
1 answer
157 views

All Outbound Traffic Uses IPV6

I have a Debian 10 server which has postfix installed, each time I try to send outbound mail traffic, the server uses IPV6 over IPV4. This causes postfix to log Connection timed out. I have tried ...
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1 vote
1 answer
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Can I have two DHCP servers for IPv4/IPv6?

I have an IPv6 block, However the network is based on an IPv4 only router. I can't change that router for several reasons. Can I have a DHCPv6 server with DHCPv4 server? Or do I have to disable DHCPv4 ...
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2 votes
3 answers
161 views

How do I visit ipv4 addresses (not domain) from an ipv6-only network?

I got an ipv6-only server and I want to visit ipv4 addresses like 8.8.8.8 with it. I know that I can visit ipv4-only website through DNS64 and NAT64. However, if the destination is just an ipv4 ...
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0 votes
1 answer
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SSRS 2019 not listening on IPv4 Ports, only iPv6

We installed SSRS 2019 on a Windows Server 2016 without any problems and configured it to use URLs with port 80. Accessing those URLs (Service and Portal) via local browser works fine, but trying to ...
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1 answer
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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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20 votes
3 answers
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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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-1 votes
1 answer
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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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1 vote
0 answers
129 views

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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0 votes
1 answer
385 views

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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2 votes
2 answers
924 views

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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1 vote
1 answer
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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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1 answer
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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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1 vote
0 answers
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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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3 votes
1 answer
4k views

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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0 votes
2 answers
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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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2 votes
1 answer
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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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0 votes
1 answer
339 views

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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0 answers
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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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0 votes
1 answer
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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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0 votes
0 answers
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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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0 votes
1 answer
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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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0 votes
1 answer
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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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