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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-1
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2answers
88 views

How many possible IP ways to interpret 1 IPv4 address (including masks)? [closed]

Considering subnet masks, how many ways can 1 IPv4 address be interpreted?
0
votes
1answer
280 views

Getting ipv6 only on ubuntu server with vmware bridge connection

I have ubuntu server 12.10 on vmware. When I have NAT network configuration I get ipv4 address (checking ifconfig eth0). With bridged connection I get only ipv6 connection, but I need an ipv4 ...
0
votes
1answer
279 views

How can I get unique IPv4 and IPv6 visitor counts on nginx access.log in shell?

How do I get some stats on unique IPv4 and IPv6 visitors by looking at a nginx access.log with UNIX CLI? I use the standard combined pre-defined format for access_log.
0
votes
1answer
224 views

Inject packet to a different NFQUEUE

I have an NFQUEUE, for IPv6 packets hooked to PREROUTING chain of mangle table in ip6tables. Once I receive a packet in user application, I modified the header. Infact, modified the header from IPv6 ...
0
votes
1answer
250 views

SMTP - Remove IPv6?

We're doing a "try-out" of SmarterTools SmarterTrack (help desk) software. We can't get it to send email. We showed someone at SmarterTools our log - SmarterTrack keeps its own SMTP log - and they ...
0
votes
1answer
248 views

Can I configure routing to a host with public ip address via a private network?

This question has alread been posted on stackoverflow (http://stackoverflow.com/q/14904325/2012441) but since I recognized that it might be offtopic there, I'll repeat it here: I'll explain the ...
1
vote
2answers
76 views

Forward traffic from IP6 to IP4

On my debian6 server is a process that only listen on IPv6 but I also need to listen on IPv4. It seems the program is IPv6 only. Is there a way to route the traffic fom IPv6 to IPv4 on the same host ? ...
-3
votes
2answers
2k views

CentOS 6.3 - Add IP's To Eth0?

How would I go about adding 3 IP's to my eth0. When I tried the following, the whole network crashed. ifconfig eth0 192.95.22.105 netmask 255.255.255.0 gateway 198.27.64.254 How would I go about ...
0
votes
1answer
215 views

Assigning two IPs to one NIC in CentOS

I have been following this method described here: http://linuxwave.blogspot.com/2010/01/setting-virtual-ip-in-centos.html To assign a virtual IP to one NIC. Basically I copied ifcfg-eth0 and makde ...
-1
votes
2answers
198 views

Is there an IP v4 address that can never be assigned? [closed]

I am aware of the difference between public and private ipv4 address space. My question is, is there a valid (in terms of DNS) IP address which will never be resolved by definition? localhost or ...
1
vote
2answers
202 views

IPv4 as default IP in dual stack [closed]

I am having an issue in prioritizing my IP network in Windows 8 to use IPv4 as default. Currently when ever I browser IP detection sites, they show me IPv6 address. How do I change this behavior?? ...
1
vote
2answers
446 views

Can a global IPv6 address be NAT'd to an internal IPv4 address at a firewall-level?

As an organisation we've just requested our first IPv6 allocation. At present we are a wholly IPv4 organisation with a global IPv4 address allocation configured on our edge router and used ...
2
votes
2answers
425 views

Server sending out packets bigger then MTU

I have a server that I am transferring data off of. We were having some problems that were traced back to the fact that the server is sending out jumbo size frames despite the fact that ifconfig is ...
1
vote
1answer
153 views

Add IP addresses on CentOS 6

I have a 12 IPv4 addresses that I need to add to a CentOS 6.3 machine however those 12 IPs are spread out among 3 different subnets. I know how to add additional IPs when they are on the same subnet, ...
1
vote
0answers
159 views

Netlink error while using IP queue

I seem to have an issue with IP queue. I have a linux machine that I am using to run some experiments. The linux machine is configured to be a router, having two NICs, connecting two other computers, ...
4
votes
2answers
450 views

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 ...
0
votes
1answer
562 views

How to enable TCP/IPV4 disabled on LAN via command prompt [closed]

I have unchecked tcp/ipv4 protocol from LAN properties & now iam unable to access the server or connect remotely. However i have serial console access to the server where i can use netsh command. ...
5
votes
1answer
435 views

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 ...
4
votes
2answers
159 views

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 ...
0
votes
1answer
411 views

Reach pc in the same network but a different subnet

PC 1 in subnet - 192.168.1.x PC 2 in subnet - 192.168.2.x Is it possible to access one pc from the other by its IP address without special router config? related: How to reach a device on a ...
3
votes
2answers
461 views

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 ...
2
votes
0answers
262 views

Routing not working with OpenVPN

I'm trying to setup an OpenVPN server but I'm stuck with routing problem... This my network configuration: Client(172.17.17.6)<->Router+Firewall<->OVPN Srv(WAN:197.174.211.77)<->Subnet A ...
0
votes
2answers
127 views

IP address in production server suddenly conked-out

Here's the situation: my company runs a website, but we don't have anybody in-house qualified to be a sysadmin, so when something goes awry, we're very much at the mercy of our hosting provider's ...
0
votes
1answer
66 views

Running IPv4 program in IPv6 network

I have an IPv4 windows client program and IPv4 Linux server. What I need is to run them in pure IPv6 network, although machines have dual stack. At the beginning I thought it's not a problem: I'll ...
1
vote
2answers
218 views

Static Routes and the Routing Table

This is very much a learning question if someone would be happy to explain a couple of concepts. My question is - the default routing table that exists in, in my case, a default Windows 7 install, ...
0
votes
1answer
564 views

Which software could I use to setup a 4in6 IP tunnel (RFC 2473) on GNU/Linux

Here is my problem. I have a server A that has two IP addresses. One public IPv4 and one IPv6. Server B has only one IPv6 address. I want to host most of my services on server B (because I have more ...
1
vote
2answers
9k views

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 ...
145
votes
13answers
23k views

Why couldn't MAC addresses be used instead of IPv4|6 for networking? [closed]

I am reading up on TCP/IP and other related protocols and technologies. MAC addresses are described as being (reasonably :) unique, and as having a large possibility space (several hundred trillions), ...
1
vote
2answers
289 views

IPv6 very slow while IPv4 not on same server

I have a development and a production server, both running CentOS, on the same network with similar configurations. On one (the production server), when I do a curl, it attempts IPv6 first, but that ...
0
votes
1answer
383 views

Transparent SOCKS5 proxy for linux using dual stack IPv4 and IPv6

Can you recommend a SOCKS5 proxy for linux that can accept IPv4 requests, but connects to the internet using dual stack (IPv4 and IPv6)? It is going to run on Ubuntu with dual stack enabled. I ...
0
votes
2answers
165 views

Iptables: Drop all incoming IP4 traffic on a port

I want to drop ALL the ipv4 traffic on a certain port and only allow ipv6 traffic with iptables. Is it possible? is so, how?
20
votes
3answers
4k views

What is the rest of the 127.0.0.0/8 address space used for?

We all know what 127.0.0.1 is used for (loopback). But is the rest of the reserved 127.0.0.0/8 loopback space widely used for anything?
1
vote
2answers
231 views

IPv6 connections routed to IPv4 device

I have an IBM 9406-250 with V5R1 and IPv4 only connectivity, and want it to be reachable over IPv6. I cannnot install an IPv6 stack on it, but I want it to be accessible by IPv6 so I can drop the ...
2
votes
1answer
42 views

Strategies physical server running multiple guests but having a single external IPv4

My hoster is - understandably - cutting down on IPv4 addresses offered with new servers so that the next time I re-locate my stuff to a new server I'll a huge number of IPv6 addresses, but only a ...
1
vote
1answer
145 views

LAN full of public ipv4 addresses - How to filter it?

The answer to my question maybe is not that hard but anyways, I do not know what to do. So, I just got in a new job in a Univerisity and I found out that the network (the LAN) is full of public IP ...
5
votes
4answers
487 views

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 ...
2
votes
1answer
1k views

Disable IPv4: What exactly does 'ifconfig eth0 0' do?

I'm experimenting with Linux and networks. What I'm trying to do is disable IPv4 for remote connections. It shouldn't be that complicated but I didn't find much about this topic. However, there is one ...
1
vote
1answer
289 views

Windows server trying to use IPv6 despite being turned off

I have a server which needs to communicate with another server (both win 2k8r2). One of them recently had an IP address change, and I suspect that the IPv6 address that the AD DNS server holds is now ...
0
votes
3answers
989 views

Pros and cons IPV6 vs stretched vlans

I'm having a hard time finding information about whether implementing ipv6 or using a stretched vlan is a better option for geographically dispersed sites is better. Does anyone know: Problems with ...
1
vote
1answer
96 views

Adding Static IP's to the NIC

We are currently working on migrating a lot of new machines to our network, and my job this morning was to setup all of the IP Addresses. I worked on this all morning, and when I got back tonight I ...
3
votes
2answers
381 views

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 ...
0
votes
1answer
234 views

what is giving me a backwards IP address?

This is the background: http://superuser.com/questions/400298/cause-of-intermittent-smtp-emailing-sending-problems In short Outlook (2007 IIRC) was receiving the wrong IP address for the SMTP server ...
0
votes
3answers
139 views

What transport protocols can be routed properly over the Internet, other than TCP and UDP?

I recently noticed that my ISP doesn't like routing native SCTP traffic over the Internet, unless it's tunnelled through UDP. A bit of a pain, but I solved the issue by using tunelling. This issue ...
0
votes
1answer
113 views

Obtaining and routing small IPv4 space?

I had an idea for designing a network setup in order to acquire high availability connections to my (small) network, but I seem to be running into a few problems trying to find out the particulars. ...
7
votes
4answers
3k views

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?
-1
votes
2answers
813 views

Is there an Infinite Number of QR Codes? [closed]

QR Codes seemingly are becoming more commonplace in the world today. I, myself, am probably one of 3 people worldwide without a smartphone thus unable to use a QR reader. The convenient possibilities ...
3
votes
1answer
325 views

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?
3
votes
1answer
448 views

Renting a IPv4 address block [closed]

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 ...
-4
votes
3answers
1k views

Can I figure out if my server has IPv4 or IPv6 from a CLI?

Is there any method (via CLI) of knowing if the server I'm at has IPv4 or IPv6? EDIT: As for the reason why I'm asking this question (apologies if I wasn't specific enough), I'm referring to this ...
0
votes
0answers
422 views

Static routes propagation under rip and gre tunnel

I have two questions. The first one regards static routes propagation under rip. I have a router that use RIP for routes and a server connected at this router by two interfaces. I want to propagate ...