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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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IPv6: Should I have private addresses?

Right now, we have a rack of servers. Every server right now has at least 2 IP addresses, one for the public interface, another for the private. The servers that have SSL websites on them have more IP addresses. We also have virtual servers, that…
Reece45
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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 have those Linux hosts answering is to set the…
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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 of the following extra requirements: the mobile…
cnst
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Carrier Grade NAT concepts: IP bans

I'd like to deploy a Wireless WAN using IPV6 for at least the wireless bits given that 6 offers higher through-put. I'm exploring the concept of CGN and what strikes me immediately is the liability. Suppose you use a single IP address for 14…
Guitarax
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IPv6 working fine, IPv4 throws OpenSSL error

I am building a webserver ( http://blog.linformatronics.nl/ ), which functions just fine on both IPv4 and IPv6 and when using a non-SSL connection. However when I connect to it through https, IPv6 works as expected, but an IPv4 connection throws a…
jippie
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Empty AAAA DNS Record with long TTL?

I pay for a DNS service based on queries per second. We are not using IPv6, but a large number of queries (that I pay for) are coming in for AAAA records. I understand that most DNS stacks will now ask for A and AAAAs at the same time, and that I…
Joel K
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Enterprise IPv6 Migration - End of proxypac ? Start of Point-to-Point ? +10K users

Let's start with a diagram : We can see a "typical" IPv4 company network with : An Internet acces through a proxy An "Others companys" access through an dedicated proxy A direct access to local resources All computers have a proxy.pac file that…
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Advantages of IPv4 over IPv6

In theory, how IPv4 is better than IPv6? I need only advantages of IPv4 for study purposes. In another words - what are the pros of IPv4?
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Ping IPv4 addresses from an IPv6 host

So, I've been given to believe that IPv6-only clients can access IPv4 servers by using addresses like: ::ffff:0:74.125.226.80 (that would be an address for google.com). I'm not IPv6 yet, but I may be soon. I have a miredo/teredo tunnel set up and…
singpolyma
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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 requires me to have a full IPv6 /64 range…
Tuinslak
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Ubuntu defaults to IPv6, should default to IPv4

Ubuntu 16.04.5 with kernel 4.4 used to work as intended: IPv4 is default. Since changing to kernel (hwe) 4.15, it uses IPv6 as default. It has IPv6 available via Tunnelbroker, broadcasted by the router. It is now defaulting to IPv6: curl ifconfig.co…
Gaia
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Some questions about xenserver HA

To start thank you for your future help :) I would like to know if it is possible to wrap my H.A as on my paint (excused me the quality of the drawing). I would also like to know how it goes with the ipv4 failover blocks in the case of an HA and a…
Araxy
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Apache web server is listening on ipv6 type

I installed an application in HP server that itself installs apache 2.4 web server.I gave ipv4 address to this application. But I checked the status of this service in the server.I found that apache web server is listening by ipv6 type and on ports…
bgv
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ProFTPD IP masquerade just some ways

I am trying to setup a FTP server using ProFTPD on Xubuntu 15.10. Users will connect to this server in two ways: internally (using an internal IPv4 address) externally (using domain name pointed to NATed IPv4 and global IPv6) On top of that, I…
Vilican
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Make reachable via a fixed address (e.g. IPv6) a server that is actually connected via a variable IPv4 adress?

Need: Internet host at a fixed IP address for full-stack self-hosting People want to perform self-hosting in an area where no ISP provide sufficient service with a fixed IP address. They provide one IP address that changes at least once every week…
Stéphane Gourichon
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