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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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Open Windows Firewall to all connections from specific IP Address

Is it possible to "whitelist" an IP Address in the Windows Firewall and allow all connections from that specific address?
Aidan Knight
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Domain connection shows as "unauthenticated"

I have seen various different questions for this problem floating around but either the circumstances arent the same or the solution doesnt work so thought i would post it to see if anybody has any suggestions. Various domain PCs and laptops appear…
gareth89
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IPv6: How to start? (ISP perspective)

In our company we have a range of /21 (2048) IPv4 public addresses. We have a bunch of Cisco routers and servers. How to get started with IPv6? What can we do to provide internet to our clients with IPv6 compliment as well?
Andre
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Why is ipv6 128bit and not 64bit?

Computer processors moved from 32bit to 64bit. Why have IPs moved from 32bit to 128bit (skipping 64bit) ? EDIT: I did not intend to make a direct comparison. Just curious why IPs skipped 64bit.
bobby
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How do I make actual use an IPv4 block that I own?

We (a small French company) had reserved an IPv4 /24 block (256 addresses) from RIPE-NCC, over 20 years ago, but never used it. Update: our assignment belongs to the "Provider Independent (PI) address space", similar to that for this nearby block…
fgrieu
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Disabling IPv4 and use only IPv6 in Ubuntu

I'm doing some IPv6 related testing, and I wanted to fully disable my IPv4 for the tests on Linux, but couldn't find any easy place to do this. How do I make my IPv6 the only active one?
Samuel Carrijo
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OpenVPN with mixed ipv4 and ipv6 clients

I have a VPN server handling various clients; some with ipv4 only, some with ipv4 and ipv6, and some that will be ipv6 only. Some of these clients are roaming, so ideally they should connect to ipv6 if it's available, and fall back to ipv4 if it…
Tuinslak
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Are same IP address with different submask unique?

Possible Duplicate: How does Subnetting Work? In a same block of IPv4 addresses, can there be same IPs with different submasks? For example, can I have this: 180.70.65.140/26 180.70.65.140/25 180.70.65.140/24 All the 3 addresses above have the…
xenon
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How to prepare (or not) small company to IPv6

There's an ongoing "panic" all over the news for some time now about IPv4 running out and IPv6 being the savior. All the big companies are preparing and showing how it should be done (last actions from Google, FaceBook). I do understand the problem…
MadBoy
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Prefer IPv4 incoming connections over IPv6

We run a social/local service that benefits from geolocating the IP of users. The problem is that with IPv6, geolocation is quite a bit spottier than with IPv4. Is there a way to prefer incoming connections over IPv6, on a Ubuntu host with nginx?…
Dan Dascalescu
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How do I get anycast for my servers?

I want to have anycast for my web service, but I cannot find any information on how to achieve this or any company that can help. I've found loads of companies offering anycast DNS, but that's not what I need. I have a stateless web service that I…
Filip Haglund
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How does anycast work with tcp?

TCP, being stateful, should require subsequent packets to reach the same server. (Stateless) HTTP runs on top of TCP, and CDN's can use anycast. So how does TCP work with anycast? What if the syn and the ack go to different servers? I think I've…
Filip Haglund
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HTTPD listening in IPv6, according netstat, but reacheable in IPv4

Using Openstack, I have a Web GUI (horizon) hosted on my server (HTTPS). When I do a netstat -lt | grep https, I have: tcp6 0 0 [::]:https [::]:* LISTEN With lsof -i :443, I have: COMMAND PID USER FD …
Antonin M.
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Why can't I ping an address on the loopback device under FreeBSD?

From Wikipedia: The most commonly used IP address on the loopback device is 127.0.0.1 for IPv4, although any address in the range 127.0.0.0 to 127.255.255.255 is mapped to it. This is not true, at least on FreeBSD: $ ping 127.1.1.1 PING…
Eugene Yarmash
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Configure BIND to prefer IPv4 without disabling IPv6

Our office network is internally dual-stack, but the connection to the rest of the Internet is IPv4-only. I've got BIND 9.9 set up on a Linux box to handle DNS resolution. Is there a way to configure BIND to prefer to use IPv4 when contacting other…
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