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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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For IPv6 migration, should we replace existing L2 switches running VLANs?

My L3 Core switch, Nortel ERS 8600, is IPv6 compatible. However, during migration to IPv6, do we need to also check the compatibility of edge/distribution switches in a VLAN-based campus network?
arun
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Does Linux support IPv4 mapped IPv6 addresses?

I work in a mixed IPv4 / IPv6 environment. I read that IPv4 addresses can be mapped into the IPv6 space with this syntax ::ffff:1.2.3.4 (1.2.3.4 is the IPv4 address) Does Linux support this notation ? All these fail on my server: ping6…
Gene Vincent
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IPv4 NameVirtualHost, IPv6 VirtualHost

Like many of us, I have an apache server (2.2.15, plus patches) with a lot of virtual hosts on it. More than I have IPv4 addresses, to be sure, which is why I use NameVirtualHost to run lots of them on the same IPv4 address. I'm busily trying to…
MadHatter
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Protocol (or service publish/discovery) to detect devices in network

we connect some embedded devices in a network. What i am looking for now, is a way to find the devices IP and identify them. We work with Windows PC´s and i am about to write a C# tool that should do this. I thought about send a udp broadcast and…
Gobliins
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Subnet Masking in IPv6

I know within IPv4 subnet masking, the network is determined by either the 1st, 2nd or 3rd set of octets. Being there are so many more characters in IPv6, how do you determine the subnet mask?
Christopher Chipps
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Renting a IPv4 address block

I am building a lab network with about 10 virtual routers and 20 host machines (also virtualized) as a part of a school project. The aim is to demonstrate a wide range of IPv6 routing, deployment and transition mechanisms. However, there is a…
user81458
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What Causes IPV6 To Be Used Instead Of IPV4?

I have two servers both running Windows 2008 with IPV4 and IPV6 both running. If on server1 I ping server2 like this ping server2 The response I get is Pinging server2 [2002:9b08:a21::9b08:a21] However if I ping server2 from my local machine…
Gavin
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Combine lighttpd configs for IPv4 and IPv6

My lighttpd.conf includes the following lines: $SERVER["socket"] == "188.40.236.66:443" { ssl.engine = "enable" ssl.ca-file = "/etc/lighttpd/ssl/startcom.ca.pem" ssl.pemfile = "/etc/lighttpd/ssl/www.unixforces.net.pem" } …
user41024
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how does ping resolve to ipv4 on one machine, but ipv6 on another?

Background I have two environments, TEST and STAGE. I use Microsoft Distributed Transaction Coordinator (MS DTC) with two linked 2008 SQL servers. A SQL job runs every couple of minutes and everything works fine on TEST. The SQL job does not run…
P.Brian.Mackey
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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 1, 2, 3, 4, 128, 129 and for mobility assistance…
Houman
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Where to find information on the IPv4 crunch, why to worry, what to do?

Where do I get information on the IPv4 crunch (what will happen, transition to IPv6, etc.)? What should one do to prepare (if anything)? Ars Technica ran "A decade's worth of IPv4 addresses" and reminded me about this.
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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 SSH tunnel from other IPv4 machines in to this VPS…
Rick
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squid proxy - use ipv6 only for outgoing traffic

I want to set up a squid proxy to use ipv6 only for outgoing traffic. I want the ip4 address to be totally invisible to the service I connecting to. I don't care about fallback and lack of ipv6 support, the service I connecting to, fully support…
Vadim Brook
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Why would I pick IPv4 or IPv6 for SSH access?

I'm setting up a Linode server and the Getting Started security guide suggests disabling ssh access over either IPv4 or IPv6 so that I only have one of the two enabled. I understand the general theory of reducing attack surface, but why would I…
Moshe
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no outgoing connection via ipv4

I'm experiencing odd behavior on a VPS I own (Debian 8.6) and, honestly, have come to a point where I have no idea how to investigate it further or fix it. As far as I can see the OS is only able to handle an outgoing request to an IPv6 address and…
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