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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3answers
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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] ...
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votes
2answers
1k views

Traceroute doesn't reach gateway

i have problem with my opensuse 11.3 network. So, i've assigned ip 192.168.137.2 to it, and another computer (win7) with ip 192.168.137.1 On the opensuse, the gateway is the 192.168.137.1. and the ...
7
votes
4answers
2k views

CIDR Ranges for Everything except RFC1918

I'm looking for a list of CIDR blocks for "The Internet", i.e. everything from 0.0.0.0 to 223.255.255.255, excluding RFC1918 address space of 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16 (yes, I know ...
8
votes
4answers
4k views

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 ...
1
vote
2answers
160 views

How to find the subnet for a single IP?

I have always used the subnet tools on the web when our datacenters provide us with new ip blocks for our machines. However, I recently ordered more IPs from our European DC and they apparently just ...
5
votes
1answer
576 views

IP Address keeps getting assigned that is already in use

I have an internal IP Address (192.168.0.57) that every couple of days will get assigned to a machine which will then periodically lose it's connection to the network throughout the day. The first ...
35
votes
5answers
5k views

Is it valid to have part of an IPv4 address set to zero?

I am working on a change in a Java EE application that would authenticate based on the user's IP address using ServletRequest.getRemoteAddr. We store IP address ranges (FROM_IP and TO_IP) in a ...
0
votes
1answer
929 views

Return packets via squid running as tproxy not working

I have been trying to get this to work properly for two days now and I desperately need assistance. I have configured Squid 3 as a proxy listening on port 3129 with the tproxy flag, and followed the ...
1
vote
3answers
241 views

What is the Range of IP-Adresses (IP4) my Website Visitors will never have?

when we read the ip address of the user using our website, which addresses will absolutely not turn up? From this page: http://www.computerhope.com/jargon/i/ip.htm class E ip addresses are ...
6
votes
1answer
2k views

Multicast hostname lookups on OSX

I have a problem with hostname lookups on my OSX computer. According to Apple's HK3473 document it says for v10.6: Host names that contain only one label in addition to local, for example "My-...
2
votes
3answers
7k views

Am I supposed to assign the broadcast IP somewhere?

This is a very basic question from a newbie point of view. I have a dedicated server at Hetzner running Windows 2008 R2. I bought a subnet of IP addresses to use in this server. They provided me a ...
0
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2answers
89 views

How can hotspots support more people than the number of IP's allowed in a typical IPv4 IP Range?

What happens when there are 259 people active on a network? Will the hotspots just move to another local IP range? My original thought was it would just start kicking people off, but I see hotspots ...
12
votes
4answers
624 views

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 ...
0
votes
1answer
262 views

netsh add IPs Batch Script

I am trying to add a large block of IP addresses to our NIC in Server 2008 R2. For some reason this isn't working from the command line or from a batch file though. FOR /L %A IN (131,1,190) DO netsh ...
1
vote
1answer
146 views

Windows 2003 Std server sending ip packets with checksum 0

So I was just doing some server side troubleshooting on the network I noticed that 1 of the servers sends all packets with the IP level checksum set to 0. It caught my eye because in my wireshark ...
5
votes
3answers
7k views

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?
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vote
2answers
208 views

Confusion about IP Blocks

I work at a hosting company (obviously not doing much networking) and the datacenter just gave us an IP block for one of our customers who has a machine in our rack there. When I assign the IPs to a ...
6
votes
4answers
9k views

Networking Question - What is a VALID Subnet Address? [duplicate]

Possible Duplicate: How does IPv4 Subnetting Work? I am currently revising Networking for the Cisco CCNA1. One of the questions that I am struggling to answer is the following: Which of the ...
8
votes
3answers
4k views

How to completely disable IPv4 stack from Linux?

How can I disable IPv4 stack from Linux ? I want to do that dynamically, ie. sometimes I want it enabled and sometimes I want only IPv6 stack. Is there any portable way to do that ? If you know how to ...
1
vote
1answer
454 views

4in6 tunneling software for Windows

I have a VM running Windows 2008 R2, and I need this VM to connect to a remote site using VPN. The VPN software does not support Windows 2008 R2 or any other 64 bit operating system, so I can't ...
1
vote
2answers
3k views

Windows Server 2008 R2 IP Address Binding order

How do I set the order of multiple IP addresses all bound to one ethernet interface?
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1answer
7k views

Powershell FTP Script Error: The remote server returned an error: 227 Entering Passive Mode

I am having Powershell FTP script problems. I have pulled my hair out over this one. I recently setup an "automated build server" for my software projects. All software projects get built and bundled ...
6
votes
0answers
2k views

IPv6: the end of NAT? [duplicate]

Possible Duplicate: Switch to IPv6 and get rid of NAT? Are you kidding? Is NAT going to disappear with IPv6? What about during the "transition" from IPv4-IPv6? How are we all going to access ...
1
vote
1answer
2k views

Configuring dnsmasq to act as a IPv6-to-IPv4 or IPv4-to-IPv6 forwarder?

Is there a guide somewhere about how to rig up some IPv6-to-IPv4 and IPv4-to-IPv6. I'd like to be able to run a dual stack on my home lan but not forfeit ipv4 just yet.
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2answers
448 views

IP6 seems to be enabled - How do I configure it without interfering with IP4?

I noticed that some of my Centos boxes have IP6 enabled, and seem to have addresses. I have no problem with this, but I would like to get a handle on it, and even connect to them using IP6. This would ...
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votes
2answers
416 views

What are my usable IPs?

I bought the IP address block 216.231.128.32/27 and the machine has the Default Gateways already setup as 64.79.102.162 and 64.79.102.193
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votes
2answers
549 views

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/...
0
votes
3answers
23k views

Win7: How to solve: Unidentified network/No Internet connection problem?

It's been a few days now that I have gotten problems and problems with my network connection, though my other computer works fine! The problematic computer is operating with (PC2) Windows 7 ...
2
votes
1answer
1k views

IPv6 fallback to IPv4

Currently I am connected to Internet over IPv4, I am using tunnel from sixxs.net and I have got subnet and one of IPv6 assigned to my eth0 interface. So, eth0 has IPv4 and IPv6: 2: eth0: <...
3
votes
1answer
3k views

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 ...
2
votes
1answer
6k views

Is it possible to disable ARP in Windows 7

I have a unique requirement where I need to disable ARP on a Windows 7 box. In previous Windows versions you could modify the ArpRetryCount in the registry (and set it to 0), but this does not work in ...
2
votes
2answers
488 views

IPv4 Client <-> IPv6 Server - Tunnel from client to server to use IPv6

I have a Debian server with a IPv6 Tunnel (from sixxs) and an IPv4 Ubuntu Client. Now i want to make a tunnel from the client to the server, so that i can surf with IPv6 from the client. Is there a ...
0
votes
1answer
300 views

Teredo and IPV6 web servers

I have two different questions, the first one could be stupid. I was reading about IPV6 and ended up in this site http://test-ipv6.com/ that says that I have a public IPV6 with Teredo tunneling. I ...
16
votes
5answers
1k views

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 ...
5
votes
1answer
780 views

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 ...
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votes
3answers
896 views

Sorting IPv4 Addresses [closed]

So I've run into a quandary on sorting IPv4 addresses, and didn't know if there was a set rule in some obscure networking document. Do I do a straight sort on the raw address only (such as converting ...
2
votes
4answers
256 views

Should I worry about my static IPs?

We currently have a range of 12 static IP addresses through our ISP that I believe are leased. Now that the IPv4 space is almost gone, should I be worried that our ISP (it's a Time Warner fiber ...
1
vote
1answer
359 views

Setting IPv4 address and domaine restrictions in IIS7

I have a couple of sites that I want to only allow access to specific IPs. I have added these IP addresses to IIS7 via the IPv4 Address and Domain Restrictions functionality, as per the link below: ...
0
votes
1answer
43 views

enabling ipv4 forwarding locked up machine. ideas?

Hey. I'm running cent 5.5 64-bit, 1 nic, eth0. I enabled ipv4 forwarding via: echo '1' > /proc/sys/net/ipv4/ip_forward and the machine locks up. cant switch ttys cant ssh into it. Had to hard ...
2
votes
3answers
693 views

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 ...
0
votes
3answers
2k views

postgres - sharing same pg_hba.conf between IPV4 system and IPV6 system

I am trying to package postgres from one machine to another. The source is windows 7 with IP V6 and target is windows XP with IPv4. Starting postgres on windows XP gives error 2010-11-01 12:01:07 ...
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votes
3answers
521 views

IPv6 is comming [closed]

Very soon, all of us will face one of the greatest changes in the global network in last 30 years: moving to the IPv6. So many system administrators will have to decide, how to handle this problem: ...
8
votes
5answers
6k views

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.
2
votes
1answer
341 views

Empty IPv6 address causes DNS error on Macs running Apache Server

For a site I manage, http://archstl.org/, the DNS entry returns an empty (::) IPv6 address when I run $ host archstl.org in the Terminal. I think the errant IPv6 entry may be the cause of my problem: ...
9
votes
3answers
3k views

What determines whether the FQDN is interpreted as IPv6 or IPv4?

When I type a Fully Qualified Domain Name (FQDN) in my URL bar, the browser connects to some mapping table (where is this table stored? with the service provider?) that determines where the file ...
0
votes
1answer
385 views

How to assign two IP addresses (one DHCP, one static) to a NIC in OpenSolaris?

This should be mind-numbingly simple and basic, and yet I couldn't find how to do it, either in "man ifconfig", in the OpenSolaris docs site, or Googling in desperation. I'm using OpenSolaris 2009.06. ...
4
votes
2answers
3k views

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 ...
1
vote
1answer
2k views

How do I rename a network interface using netsh?

I'm building my first Windows 2008 Server Core machine (running R2) and want to rename the IPv4 network interfaces to something more meaningful. It seems most likely that this is done using netsh ...
3
votes
5answers
451 views

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 ...
2
votes
2answers
3k views

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 ...