Refers to the 4th revision of the Internet Protocol, where addresses are usually displayed in the form: 192.0.2.235

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Unable to connect to one particular FTP server

I am unable to connect to a particular FTP server at Fasthosts over my usual ISP connection, using any of Filezilla, Notepad++ or WinSCP FTP clients on either my PC or my laptop. However, I CAN ...
0
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0answers
9 views

PPTP VPN issue, multiple platforms

Using PPTP VPN for multiple clients, I've seen an interesting issue on Mac OSX El Capitan, and Windows 7 and 8. For clients connecting from home using a subnet that is identical to the internal subnet ...
1
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2answers
45 views

How to connect two locally linked computers to WIFI using IPv4 addressing?

I want to connect my laptop and another computer (which is RaspberryPi 2, but that's not very important) using a crossover cable. Then I would like to SSH from my laptop to another computer. Finally, ...
0
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1answer
36 views

My IPv4 Address automatically changes

I have Windows 8.1, For some reasons I need forward ports for my computer. (you may know that computer's IPv4 Address is necessary for it). But my computer's IPv4 address automatically changes after ...
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vote
1answer
3k views

Blocked by Group Policy: trying to install TCP/IPv4 (Windows 10)

So I uninstalled Winsock and Winsock2 registry keys and now cannot connect to the internet. I am using the following walkthrough to try and reinstall Internet Protocol Version 4 (TCP/IPv4) but every ...
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1answer
57 views

IP Datagram Fragmentation total length and payload calculations

I do not understand how to fragment a IP datagram. Let's say the original datagram has a total size of 302 (20bytes header and 282 bytes payload). My datagram needs to be fragmented since it goes ...
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0answers
48 views

IPv4 or IPv6 for local DNS server?

I am a bit inexperiencied with networks. I have set up and dns server in a virtual machine on Debian 8 using dnsmasq. To test if it was working, I gave it only one record: www.facebook.com with ...
3
votes
1answer
52 views

IPv4 connectivity to IPv6-only host

I have a IPv6-only host (let's name it S) in my home network which is accessible from outside by its IPv6 address. Since my ISP doesn't provide any IPv4 connectivity, it cannot be accessible from IPv4 ...
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2answers
39 views

IPv4 changes by itself

My IPv4 address randomly changes by itself but I can't figure out why ? It changes from 192.168.0.10 to 192.168.0.13 and vice versa. That happens doesn't happen often but very randomly... Does ...
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2answers
2k views

How do I set a static IP address in Windows?

If I do not have access to the router / DHCP server to create a static reservation (i.e. asking the router / DHCP server to set aside a specific IP address when a certain MAC address requests it), how ...
0
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2answers
282 views

long delay during ssh login

When I connect to my Debian server via ssh, the ssh client tries to establish a IPv6 connection. This fails after a long timeout (~30sec), then falls back to IPv4, which then succeeds, and I'm ...
0
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1answer
205 views

Any way to create OpenSSL certificate request that would be valid for two IP addresses?

I have a private app running as a webserver on a machine on an isolated wifi router using 192.168.1.*/255.255.255.0, with no DNS capability & no upstream Internet; basically, only local wireless. ...
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4answers
4k views

Why does the “Internet of Things” enforce the need for IPv6 addresses?

If you have multiple devices in one network, the amount of IPv4 addresses will not increase linearly to accomodate the number of devices. There is just one IPv4 address per Network/Router that is ...
0
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1answer
199 views

PC sends repeated ARP requests to Default Gateway

CONTEXT: My machine, for whatever reason, is flooding the network with ARP requests. A downstream switch sees this as malicious and cuts my connection. I've narrowed it down to one of the dozen or ...
20
votes
2answers
3k views

Can a domain name have both IP addresses (IPv6 and IPv4)?

Can a domain name (example.com) have both the IP addresses, IPv6 and IPv4? Which IP address does a domain name have? IPv6 or IPv4? But I am not sure that it has both or any one at a time.
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vote
1answer
164 views

Network Interface starts without IPV4

When I boot some RHEL 6.5 server, the NIC shows an IPV6 address but no IPV4 on ifconfig However, if I ifdown + ifup it, it gets its IPV4 address (via DHCP). For clarity, is is enabled on boot via ...
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0answers
155 views

Assign static IPv4 to specific MAC address

I am trying to assign same IPv4 to few devices every time they connect to wi-fi AP. I use Zyxel NWA3560-N. I think that there should be option to set static IP on every device and block assigning ...
2
votes
1answer
281 views

Shortcut to change IPv4 properties

I am looking for simple ways to change IPv4 properties of one of my networks and actually I can't find anything promising, just something about netsh. But I think there should be way to create a .bat ...
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2answers
55 views

I'm trying to open query.yahooapis.com but curl is trying to use IPV6 even if I only have IPV4 enabled

When I try to call query.yahooapis.com with curl it's trying to use the ipv6 address but IPV6 is disabled on my computer $ curl -v 'http://query.yahooapis.com/' * Hostname was NOT found in DNS cache ...
4
votes
2answers
241 views

Accessing an IPv6 server with an IPv4 address?

I have a server (Mac OS X 10.11) machine at home which exposes various services via web interfaces. I would like to access these from outside my own network. My ISP does not provide IPv4 addresses and ...
1
vote
1answer
100 views

How can my personal ISP connection return two public IP addresses?

I want to play a game (Wildstar) but each time I login, it gives me an “invalid login token” error. After looking into the issue, I found that it was caused by, according to Wildstar: WHAT DOES IT ...
0
votes
1answer
117 views

Access IPv6 home server remotely (also from IPv4 networks)

I have an ISP that uses IPv6 and I want to set up a home server running windows server 2012 essentials and access it remotely using the remote web access feature. is this feature capable of IPv6? and ...
0
votes
1answer
235 views

Access IPv6 server via IPv4 tunnel?

I am an installer for an ISP here in Alberta Canada. They recently launched LTE but are doing double NAT on IPv4 so accessing a server from the outside world isn't possible via IPv4. They do however ...
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0answers
186 views

Just upgraded to HughesNet Gen4. Have IPv6 access but not IPv4 access on my wired network.

We just upgraded to HughesNet Gen 4. Now our wired network only works partially. We can access wireless (which runs through our wired switch). The Wired network says IPv4: No Internet Access. IPv6: ...
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0answers
138 views

windows 7 prefer ipv4 over ipv6

I have ATT Uverse for my internet. A few months ago we had problems and they installed a new router. All of a sudden google and facebook are using ipv6 and are getting horrible performance, they ...
1
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1answer
143 views

ssh from IPv4 to IPv6

I have been trying to reach, using ssh, an IPv6 server from a IPv4 (only) client, but am having no success. Both systems run ubuntu 12.04. I am aware that ipv4 and ipv6 are different protocols and ...
1
vote
1answer
94 views

Properly setup a DNS Fallback

My country just ordered the Internet Access Providers to blacklist some domain names from their respective DNS (i.e. responding to t411.io by 127.0.0.1). To get over this restriction is fairly ...
104
votes
4answers
15k views

What's the difference between 127.0.0.1 and 0.0.0.0?

I understand that 127.0.0.1 points to localhost, and so does 0.0.0.0 (correct me if I'm wrong). So, what's the difference between 127.0.0.1 and 0.0.0.0?
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1answer
256 views

Access IPv6 computer from IPv4-only network. Is it possible?

I recently changed from an ADSL 10 MB to a GPON 40 MB and since then I'm having a bad headache. My old ISP (ADSL) gave me always a valid public IPv4. Sometimes it changed but there was no problem ...
0
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0answers
78 views

directed subnet broadcasts with openwrt

I've got a wireless router with openwrt 14.07 that acts as a router (not a bridge) between the local ethernet subnet (eg. 192.168.1.0/24) and a wireless network (eg. 192.168.2.0/24). I would like to ...
1
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0answers
37 views

ipv4tov6 address translation in windows7

I have a windows7 PC connected to a IPv6 network. On the PC I have an application that needs to communicate with another IPv6 machine. The application can only be configured with an IPv4 address. Is ...
0
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3answers
164 views

Leading zeros in IPv4 address; is that a no-no by convention or standard?

I teach a class on a software product my company makes and I find that students frequently add leading zeros to a configuration page to have the software connect to our hardware. Leading zeros are ...
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1answer
86 views

Ipv4 properties tab greyed out

I am facing this problem of IPv4 and IPv6 properties tabs greyed out and not able to change the settings of the same. I have tried many solutions given online such as netsh commands and antivirus and ...
2
votes
1answer
361 views

Can't added back my client for microsoft networks in Windows 10

I can't open network shared folders. Got to looking at my NIC properties, and I found that I was missing everything buy IPv4 and IPv6. So I started to try to add back to client, and protocol. I can't ...
0
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3answers
75 views

Static IP without a static IP

I need my network to have an external facing IP address that is static. My ISP will not provide me with one. I know I can use use DDNS to achieve this in a way. I want to setup an Exchange server ...
1
vote
1answer
14 views

Port restrictions and MACs

I have a question regarding connections within a university setting. In my room I have two network points. One for my pc and one for my voip phone. Each network port is restricted to one mac address, ...
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0answers
144 views

Nslookup works but ping fails

I've recently ran into this weird problem where the domain names fail to resolve from DNS. When I try to ping google.com, I get ping request could not find host google.com, but nslookup returns the ...
8
votes
5answers
3k views

What is the difference between 127.0.0.1 and my assigned IPv4 address?

I read here that: 127.0.0.1 is the IP (IPv4) address of your local computer, synonymous with localhost. When I run the command ipconfig what I actually see is some other IP address. So I’ve ...
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0answers
184 views

Disabling IPv6 DNS resolution on client only to a specific domain

I have a Windows 8.1 machine, from which I want to connect to my company's extranet. However, I can't connect to it from my domain-joined laptop when it's at home, though I can from a work, or a ...
0
votes
3answers
233 views

How do I find the IPv4 address of a computer on my Macintosh Wi-Fi network?

Is there any way to find the IPv4 address of a certain computer on my Macintosh Wi-Fi network? I know the computer name and such, so how can I use this to pinpoint which IP is theirs?
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0answers
178 views

Make socat listen on both IPv4 and IPv6 stacks

Switched providers the other day, they only assign DSlite-connections. I'm fine, I thought. Thing is - I want to access some of my stuff from outside of my network, which should be of much less a ...
0
votes
1answer
59 views

Using DNS to forward to a specific local address and port?

Im running a server on a local address, a raspberry pi at x.x.x.111:64738. I own a domain, mydomain.nu. I want to create a subdomain (the hosting provides a cPanel interface) and forward it to my ...
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2answers
240 views

How to extend ipv4 addresses to 64 bit? [closed]

I know that ipv4 addresses are 32 bits. But is it possible to extend the ipv4 addresses to 64 bit from 32 bit?
0
votes
1answer
185 views

Timeout on Specific IP Address

I'm thomas and I have a weird Problem with my Network/Internet Connection: It's one specific IP(85.10.200.167) I'm unable to connect to. The IP is public in the Internet and works well for many ...
0
votes
1answer
491 views

How Duplicate address is detected in lan for ipv4 networks

If i have two pc's connected to a switch , and i statically configure the same ip address on both the pc's, then how the pc's come to know that there is a address conflict (duplicate address) on the ...
3
votes
3answers
602 views

Is an openVPN with ipv6 more secure than PPTP VPN with ipv4?

I have heard that using ipv6 in combination with a PPTP vpn can expose your true ip address, so I have been using a PPTP VPN with ipv4 for the past few months. I am considering switching to an openVPN ...
0
votes
3answers
120 views

No internet when cable is connected directly to pc

I have a router with static settings in it, my computer is connected to that router, I want to remove that router and connect my PC directly to the internet, I went to the ipv4 settings in network and ...
6
votes
1answer
37k views

Optimal setting for advanced parameters for Realtek PCI-e GBE family network card

superusers. I am trying to get the best possible setting for my Realtek PCI-e GBE family controller network card so that when it will be literally minimal or zero lag when playing online game. ...
0
votes
1answer
91 views

IPv4 interface number

I came across a question in Self Test Software for MS Exam 70-642 Which command adds route to destination server, with IP address 10.51.0.0 and subnet mask of 255.255.0.0. Next hop should be ...
0
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0answers
237 views

Default Gateway address for multiple VPN users/clients

We need some help with a VPN setup for a school project. What we want to do: We would like to have approx. 10 different VPN uses that can connect to our Windows Server 2012 R2 which is setup as a ...