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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22 views

How do I disable CGN (LSN) so I can host a server?

I have figured out that inbound packets do not reach my home network due to an apparent existence of CGN. This fully inhibits my ability to host a server. I have set up everything correctly; port ...
0
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2answers
39 views

Would getting a new Comcast modem change the WAN IP?

Recently I've been getting ddosed because someone sent me a link which logged my IP. I've called Comcast and asked if they could change my ipv4 address and they only told me to do ipconfig /release ...
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1answer
27 views

What does (Preferred), (Tentative) and (Duplicate) mean against an IPv4 Address with ipconfig

I have been tinkering with subnets and have noticed the above as annotations to the IPv4 line of ipconfig. IPv4 Address. . . . . . . . . . . : 192.168.1.241(Tentative) IPv4 Address. . . . . . ...
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1answer
2k views

Can't ping to computer but reverse ping can

So Computer 1 can ping to computer 2 but reverse it can't Setup: Router A (192.168.0.xxx) 255.255.255.0 > Router B (192.168.1.xxx) 255.255.255.0 So computer1 on Router B can ping to computer2 on ...
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5answers
28k views

How can I figure out what IPv6 to use if I want to set a static IP for my computer?

I recently installed Windows Server 2012 on my desktop. I changed my connection settings to hardcode my internal IP address as 192.168.0.99 (IPv4). Windows Server 2012 warned me that I should also set ...
3
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2answers
24 views

Test environment post carrier-grade NAT by ISP

Today I replaced my old router with a new faster router in my home. However, this event appears to have migrated me to carrier-grade NAT'ing by my ISP. I tried with my old router but the same holds ...
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1answer
79 views

Why is my IPv6 Address showing instead of my IPv4?

I am wanting to host a server, and I would like people to join through my IPv4 Address, but when I use ipconfig in the Command Prompt, I only get my IPv4 Address, and when I google "What is my IP" I ...
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3answers
3k views

How to get network ip address via windows command prompt?

How to get network ip address via windows command prompt? I know tat ipconfig /all shows ip configuration, but what about having just ipv4 adress?
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3answers
12k views

Unable to ping broadcast address

Host address: 192.168.0.13 Network: 192.168.0.0 255.255.255.0 Router: Cisco DPC3825 DOCSIS 3.0 Gateway (user manual) My home network uses the 192.168.0.0 /24 network for my (mostly wireless) devices....
107
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4answers
16k 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
28 views

BInd9 not woking with ipv4 by default

I have an Debian running Bind9 with many logs like error (network unreachable) resolving so set -4 in /etc/default/bind9 but not forced to work with ipv4 look the /etc/default/bind9 # run ...
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2answers
56 views

Why do I have an IPv4 and IPv6 address at the same time?

I was tampering with my LAN and noticed that some servers see my external network address as an IPv6 while others as an IPv4. Why?
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1answer
70 views

I can access my website using my IPv4 address but not my IPv6 address. Why?

I exposed my personal web server to the outside world by opening port 80 for incoming on my firewalls and doing the proper port forwarding. Then I went to whatismyipaddress.com to get my outside IP ...
1
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1answer
27 views

why does ipv6 coexist with ipv4 slow the load?

My laptop have two network adapter:one is wired lan, while the other is wireless lan. Now I connect ipv6 using wired lan and ipv4 using wireless. The web page seems to get something wrong. It load ...
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1answer
33 views

Is ping's handling of incomplete IPv4 addresses standard? [duplicate]

I accidentally hit return too early when attempting to ping a device, so instead of ping 10.111.12.4 I typed C:\Users\roadierich>ping 10.111 Pinging 10.0.0.111 with 32 bytes of data: Request ...
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2answers
83 views

Practical (not theoretical) Subnetting 192.168.0.0/25

The Situation I have a Netgear WGR614v7 router (wireless disabled). Hosts in both subnets should have internet access but should not be able to ping hosts across the subnets. I want to split my ...
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2answers
53 views

IP address rules for each octet

This Wikipedia article on IPv4 addresses states the valid range for each octet is 0-255. However, when I enter a number that is deliberately out-of-range on my Windows 7 PC, the valid range is ...
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0answers
56 views

10.0.0.1 is non-routable IP v4 address but it is routable over the Internet

Strange but this is happening to me I have checked on multiple machines but on the same network. IP v4 address - 10.0.0.1 is routable! see attached screenshot and suggest why this is happening. since ...
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0answers
32 views

VPN Connection: Draytek Vigor 2820 Cannot Initiate IPSEC Tunnel

I have been asked to setup a site-to-site IPSEC VPN Tunnel from a Vigor 2820 (at the client's premises) to a Cisco ASA 5505 (hosted at Rackspace). I have input all of the details that Rackspace had ...
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0answers
140 views

How does AWS convert an IPv6 address to an IPv4 address when whitelisting “My IP” address

I recently had to whitelist my IP address in an AWS security group using the "My IP" option. It worked perfectly and displayed an IPv4 address, but when I looked up my IP address with Google I got an ...
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4answers
3k views

Can we use IPv6 addresses only?

I am trying to do a project about IPv6. My first query is, can we completely disable our IPv4 address and use only our IPv6 address? My second query is, how can an IPv6-only host communicate with an ...
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2answers
3k views

Get IPv6 address of an IPv4 machine?

Given two machines on a local network, both connected via IPv4 and IPv6, can machine A get the IPv6 of machine B if it has machine B's IPv4 address? I presume the ARP cache should be able to provide ...
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1answer
1k views

Why is my computer suddenly using NBNS instead of DNS?

I have a Windows 7 laptop which I regularly use to access wireless internet when traveling. Normally, everything connects and functions as expected, but as of 4 days ago, I have noticed that I am ...
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2answers
13k views

Doubt In default time to live (TTL) 255?

I know that,The Default Time to live value is 255, each time a ipv4 packet crosses a router that value is decremented by 1. But,When I ping my adsl router it shows TTL as 64 Pinging 192.168.0.1 ...
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0answers
55 views

no internet connection windows server 2012 setting up remote desktop connection

I'd like to setup my Windows 2012 Server so I can Remote Desktop Connection from my client (Windows 10) with the static IP that I'm going to give to the server. (So not through a site). After having ...
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0answers
69 views

Ping: General Failure

I am facing a weird issue on my laptop that only Internet Explorer can access internet no other application, not even chrome, iTunes. When I try to ping any website I get an error. When I ...
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2answers
18k 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 ...
0
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1answer
3k views

What other protocols can run over the Link Layer besides IP protocol?

I am reading about ARP here and it says "Each protocol is assigned a number used in this field. IPv4 is 2048 (0x0800 in Hexa)." What are other alternatives to IPv4 and IPv6 as protocols to be run ...
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0answers
51 views

TTL in ping reply set to 128

I'm using the ping command to ping google.com, and can't understand why am I getting TTL of 128 in the response. ping www.google.com PING www.google.com (172.217.19.196) 56(84) bytes of data. 64 ...
3
votes
1answer
184 views

Translating IPv6 packets to IPv4 packets to reach a game server

I am behind a DS-Lite system and therefore have no native IPv4 address. But out of curiosity, I want to find out, if it is possible to set up a game server behind that. More precise, a counter-strike ...
0
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1answer
30 views

Listen to localhost messages

Suppose a TCP/IP client application has connected to a certain port on a server. Both client and server are operating on localhost. Is it possible for another application (also on localhost) to ...
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0answers
13 views

GNU/Linux ping: Disable timestamps

I'm using ping utility, iputils-sss20101006. The -s 100 option causes the ICMPv4 packet to have an 8-byte timestamp and 92 bytes of random data. Therefore all Echo and Echo Reply packets include an 8-...
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1answer
55k 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. (...
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2answers
78 views

Would NAT be eliminated transformed in ipv6?

NAT is a wonderful concept used in ipv4. It is the major reason for the existence on internet, in my concerns. There are no networks in the world that doesn't work without employing NAT. All I seek ...
0
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1answer
68 views

multiple static IP address

I am trying to setup 2 external static IP address through a Arris Modem/router bridged to 2 router so I could split pc network and server network. How would I go about setting it up properly/ if it is ...
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2answers
199 views

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 ...
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0answers
29 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 ...
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2answers
125 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
44 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 ...
0
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1answer
579 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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5answers
4k views

Dynamic DNS for both IPv4 and IPv6 (using freedns.afraid.org or others)

[Edit: I have now found a solution; see below for my answer] I want to set up dynamic DNS on my Fritz!Box 7490, so that it is reachable both on IPv4 and IPv6. Note that I want to reach the Fritz!Box ...
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2answers
53 views

Identify the TCP/IP classes respectively by beginning octets

I am busy studying for a network exam and I am stuck with this zinger: By studying the following beginning octets, identify the TCP/IP classes respectively 1-126 224-239 240-254 ...
0
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1answer
168 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 ...
6
votes
1answer
955 views

Exactly how many valid IPv4 addresses are there?

Seemingly simple question, with enough edge and corner cases that I don't trust my ability to calculate it. What is the exact number of valid IPv4 addresses that could potentially be used as ...
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0answers
89 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
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1answer
107 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 ...
1
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2answers
71 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 ...
22
votes
10answers
202k views

Why do I get “General Failure” when pinging host name on a Win 7 node on the network?

This is a very peculiar problem with a station on our network. The client pc is running Windows 7 Pro. What makes this problem interesting is that this client is the only node on the network that ...
19
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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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2answers
755 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 ...