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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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Laptop being assigned IPv4 address out of router's DHCP range

I have a laptop connecting wirelessly to an E4200 Linksys router. The router is configured to use DHCP with a range from #.#.#.100 to #.#.#.254. However, the laptop is being assigned an IP address of #.#.#.80 which is below the specified DHCP range.…
Bryan Roth
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IPv4 is almost out in Asia-Pacific, what are people doing about it?

Asians and those in North America are going to be separated on the internet if ISPs / telecoms don't do something. European progress to IPv6 is taking place much faster than in North America. What solutions are available today, and what is being…
unixman83
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Client unable to reach Internet through OpenVPN

The clients can all connect through OpenVPN. OpenVPN serves the following pool: server 10.8.0.0 255.255.255.0 I've configured the server's iptable with the following rule: iptables -t nat -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j…
Carroarmato0
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Isn't NAT a MUST when a LAN uses rfc 1918 private IPs?

Isn't NAT a MUST when a LAN uses rfc 1918 private IPs? Can an organization assign its hosts with private IPs and still communicate with the external world without NAT? how can an internal host with a private IP (say 10.1.1.1) communicate with…
aks
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Static IPv4 and dynamic IPv6 on same interface

I am trying to set up a CentOS 5.4 box to use a static IPv4 address, while getting a dynamic IPv6 address at boot time. I have only one interface, apart from the loopback interface, eth0. It has a static v4 and internet connectivity (I can SSH in).…
Zsub
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Purpose of IPv4 mapped IPv6 address

I am still confused about the purpose of IPv4 mapped IPv6 addresses and would like some enlightenment. I have a server client pair of machines and I intend to connect them via Openvpn. The server has an IPv6 address, while the client an IPv4 only…
Mervyn Heng
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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 of all I permanently disabled IPV6 using this tutorial The…
Chico3001
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Configuring dnsmasq to filter A or AAAA queries

Can I configure dnsmasq to respond to either ipv4(A) or ipv6(AAAA) queries only? I am using dnsmasq to forward queries from an internal subnet to a WAN connection. Unfortunately, sometimes I will only have an ipv6 connection on the WAN interface,…
E. Ionescu
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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 individual IPs to virtual machines which are running on a…
Steffen Vogel
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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 website if it does not have an IPv4 address? I…
ab0032
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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 record the system pings the IPv4 address from…
PietH896
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IP Address is very slow compared to loopback address

I have an AWS EC2 VM. I want to run a bunch of scripts on a PostgreSQL server hosted on the same machine. When I use the IP address of the server in scripts, it took almost 5 seconds per script. But when I use the loopback address instead of server…
YogeshR
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Why is my computer making unreachable ICMP requests to the gateway?

After playing around with the ICMP filter on wireshark, I noticed that my machine is making ICMP requests to the router regularly, which consistently fails: I noticed that the subsequent ICMP requests which fail are using UDP on port 53. Could…
Daniel Minnaar
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Can i disable link local IPv4 address assignment in route table Ubuntu 16.04 permanently

I am having trouble with disabling link local IPv4 address getting added in my routing table. So far i have uninstalled, avahi-daemon, commented out link-local 169.254.0.0 line in /etc/networks file , but still when DHCP client fails, i see that in…
Indra Chatterjee
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Uninstall TCP/IPv4 (Server 2016)

In Microsoft Windows Server 2016 Datacenter there is a properties window for network interfaces, inside that properties window there are several checkboxes that control protocols. (Internet Protocol Version 4 (TCP/IPv4) being one of them). On…
UpTide
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