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• How to Assign a Static IP to an Ubuntu 10.04 Desktop Computer

  - by Mysticgeek

  If you have a home network with several computers, assigning them static IP addresses can make troubleshooting easier. Today we take a look at switching from DHCP to a static IP in Ubuntu. Assign a Static IP Using Static IPs prevents address conflicts between machines and can allow easier access to them. If you have a small home network and are satisfied with the machines getting their IP address automatically via DHCP, there won’t be anything gained by using static addresses. Using Static IPs isn’t necessarily for the average user, but if you’re a geek who wants to know the address assigned to each machine, it can allow for faster troubleshooting.  To change your Ubuntu machine to a Static IP go to System \ Preferences \ Network Connections. In our example, we’re on a wired system so click on the Wired tab, then select Auto eth0 and click on Edit. Select the IPv4 settings tab, change Method to Manual, click the Add button. Then type in the Static IP Address, Subnet Mask, DNS Servers, and Default Gateway. Then click Apply when you’re finished. Make sure to hit Enter after typing in the Default Gateway otherwise it will revert back to 0.0.0.0 You’ll need to enter in your admin password before the changes go into affect. To verify the changes have been made successfully launch a Terminal session and type in ifconfig at the command prompt, or follow these directions. You also might want to ping the address from another machine to make sure everything is communicating. If you want to assign a Static IP to your Windows machines, check out our article on how to assign a Static IP on Windows systems (make sure to browse the comments as our readers have some good suggestions).  Whether you have a small office or home network set up with a server and several machines, using a Static IP on each device can help you manage them easily. Again, it isn’t for everyone as it really depends on how your network is setup and the way you use it. Similar Articles Productive Geek Tips Change Ubuntu Desktop from DHCP to a Static IP AddressAllow Remote Control To Your Desktop On UbuntuAssign Custom Shortcut Keys on Ubuntu LinuxKeyboard Ninja: 21 Keyboard Shortcut ArticlesChange Ubuntu Server from DHCP to a Static IP Address TouchFreeze Alternative in AutoHotkey The Icy Undertow Desktop Windows Home Server – Backup to LAN The Clear & Clean Desktop Use This Bookmarklet to Easily Get Albums Use AutoHotkey to Assign a Hotkey to a Specific Window Latest Software Reviews Tinyhacker Random Tips HippoRemote Pro 2.2 Xobni Plus for Outlook All My Movies 5.9 CloudBerry Online Backup 1.5 for Windows Home Server TubeSort: YouTube Playlist Organizer XPS file format & XPS Viewer Explained Microsoft Office Web Apps Guide Know if Someone Accessed Your Facebook Account Shop for Music with Windows Media Player 12 Access Free Documentaries at BBC Documentaries

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• Windows 7 - traceroute hop with high latency! [closed]

  - by Mac

  I've been experiencing this problem for quite a while, and it's quite frustrating. I'll do a traceroute, to www.l.google.com, for example. This is the result (please note: I will replace some parts of personal information with text - i.e. ISP.IP is in reality an actual IP address, and ISPNAME replaces the actual ISP name): Tracing route to www.l.google.com [173.194.34.212] over a maximum of 30 hops: 1 1 ms 1 ms <1 ms 192.168.1.1 2 9 ms 8 ms 10 ms ISP.EXCHANGE.NAME [ISP.IP.172.205] 3 161 ms 171 ms 177 ms host-ISP.IP.215.246.ISPNAME.net [ISP.IP.215.246] 4 12 ms 9 ms 10 ms host-ISP.IP.215.246.ISPNAME.net [ISP.IP.215.246] 5 10 ms 9 ms 17 ms host-ISP.IP.224.165.ISPNAME.net [ISP.IP.224.165] 6 10 ms 9 ms 10 ms 10.42.0.3 7 9 ms 9 ms 10 ms host-ISP.IP.202.129.ISPNAME.net [ISP.IP.202.129] 8 10 ms 9 ms 9 ms host-ISP.IP.209.33.ISPNAME.net [ISP.IP.209.33] 9 77 ms 129 ms 164 ms host-ISP.IP.198.162.ISPNAME.net [ISP.IP.198.162] 10 43 ms 42 ms 43 ms 72.14.212.13 11 42 ms 42 ms 42 ms 209.85.252.36 12 59 ms 59 ms 59 ms 209.85.241.210 13 60 ms 76 ms 68 ms 72.14.237.124 14 59 ms 59 ms 58 ms mad01s08-in-f20.1e100.net [173.194.34.212] Trace complete. Notice that there is a spike on the 3rd hop, but also notice that the 3rd and 4th hop are to the exact same destination. Furthermore, when I ping the offended hop separately, I get the low latency I would expect to that server: Pinging ISP.IP.215.246 with 32 bytes of data: Reply from ISP.IP.215.246: bytes=32 time=10ms TTL=253 Reply from ISP.IP.215.246: bytes=32 time=9ms TTL=253 Reply from ISP.IP.215.246: bytes=32 time=12ms TTL=253 Reply from ISP.IP.215.246: bytes=32 time=9ms TTL=253 Reply from ISP.IP.215.246: bytes=32 time=10ms TTL=253 Reply from ISP.IP.215.246: bytes=32 time=9ms TTL=253 Reply from ISP.IP.215.246: bytes=32 time=10ms TTL=253 Reply from ISP.IP.215.246: bytes=32 time=9ms TTL=253 Reply from ISP.IP.215.246: bytes=32 time=10ms TTL=253 Reply from ISP.IP.215.246: bytes=32 time=10ms TTL=253 Ping statistics for ISP.IP.215.246: Packets: Sent = 10, Received = 10, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 9ms, Maximum = 12ms, Average = 9ms I'm baffled as to why or how this is happening, and it seems to "fix itself" at random times. Here is an example of where it was working as expected: http://i.imgur.com/bysno.png Notice how many fewer hops were taken. Please note that all the posted results occurred within 10 minutes of testing. I've tried contacting my ISP, and they seem clueless; in their eyes, as long as "the download speed is not slow", then they're doing everything right. Any insight would be very much appreciated, and thanks in advanced!

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• .NET Properties - Use Private Set or ReadOnly Property?

  - by tgxiii

  In what situation should I use a Private Set on a property versus making it a ReadOnly property? Take into consideration the two very simplistic examples below. First example: Public Class Person Private _name As String Public Property Name As String Get Return _name End Get Private Set(ByVal value As String) _name = value End Set End Property Public Sub WorkOnName() Dim txtInfo As TextInfo = _ Threading.Thread.CurrentThread.CurrentCulture.TextInfo Me.Name = txtInfo.ToTitleCase(Me.Name) End Sub End Class // ---------- public class Person { private string _name; public string Name { get { return _name; } private set { _name = value; } } public void WorkOnName() { TextInfo txtInfo = System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo; this.Name = txtInfo.ToTitleCase(this.Name); } } Second example: Public Class AnotherPerson Private _name As String Public ReadOnly Property Name As String Get Return _name End Get End Property Public Sub WorkOnName() Dim txtInfo As TextInfo = _ Threading.Thread.CurrentThread.CurrentCulture.TextInfo _name = txtInfo.ToTitleCase(_name) End Sub End Class // --------------- public class AnotherPerson { private string _name; public string Name { get { return _name; } } public void WorkOnName() { TextInfo txtInfo = System.Threading.Thread.CurrentThread.CurrentCulture.TextInfo; _name = txtInfo.ToTitleCase(_name); } } They both yield the same results. Is this a situation where there's no right and wrong, and it's just a matter of preference?

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• IP address spoofing on c#

  - by SomeOne

  Is it true if I want to make ip spoofing program I need only a program that can change my machine ip address??? if true how can i use System.Net - IPAddress Class to set the ip address ....

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• Get Local IP-Address using Boost.Asio

  - by MOnsDaR

  Hey, I'm currently searching for a portable way of getting the local IP-addresses. Because I'm using Boost anyway I thought it would be a good idea to use Boost.Asio for this task. There are serveral examples on the net which should do the trick. Examples: Official Boost.Asio Documentation Some Asian Page I tried both codes with just slight modifications. The Code on Boost.Doc was changed to not resolve "www.boost.org" but "localhost" or my hostname instead. For getting the hostname I used boost::asio::ip::host_name() or typed it directly as a string. Additionally I wrote my own code which was a merge of the above examples and my (little) knowledge I gathered from the Boost Documentation and other examples. All the sources worked, but they did just return the following IP: 127.0.1.1 (Thats not a typo, its .1.1 at the end) I run and compiled the code on Ubuntu 9.10 with GCC 4.4.1 A colleague tried the same code on his machine and got 127.0.0.2 (Not a typo too...) He compiled and run on Suse 11.0 with GCC 4.4.1 (I'm not 100% sure) I don't know if it is possible to change the localhost (127.0.0.1), but I know that neither me or my colleague did it. ifconfig says loopback uses 127.0.0.1. ifconfig also finds the public IP I am searching for (141.200.182.30 in my case, subnet is 255.255.0.0) So is this a Linux-issue and the code is not as portable as I thought? Do I have to change something else or is Boost.Asio not working as a solution for my problem at all? I know there are much questions about similar topics on Stackoverflow and other pages, but I cannot find information which is useful in my case. If you got useful links, it would be nice if you could point me to it. Thanks in advance, MOnsDaR PS: Here is the modified code I used from Boost.Doc: #include <boost/asio.hpp> using boost::asio::ip::tcp; boost::asio::io_service io_service; tcp::resolver resolver(io_service); tcp::resolver::query query(boost::asio::ip::host_name(), ""); tcp::resolver::iterator iter = resolver.resolve(query); tcp::resolver::iterator end; // End marker. while (iter != end) { tcp::endpoint ep = *iter++; std::cout << ep << std::endl; }

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• Asus WL-520GU conflicting subnet (and/or IP) with 2Wire DSL

  - by Paula

  I have an Asus wireless router: WL-520GU... and an AT&T 2Wire for my DSL connection. When I try to browse anywhere, I just get an odd message from the Asus router (in the common Asus broken-English, bad formatting, and awful spelling): http://postimage.org/image/upxrjflcj I guess it's trying to say: Your Asus Router and your 2Wire have the same subnet mask. (It doesn't say if that's good, or bad... but it sounds like they must be different.) but... But for the "solution" it looks like it's trying to say: Your Asus Router and your 2Wire have the same IP address. My Asus has the defaults: 192.168.1.1 and 255.255.255.0 My 2Wire has: 192.168.1.66 I'm not seeing where the conflict(s) could be. The Asus firmware is v3.0.0.14 . None of these problems occur with the old v3.0.0.8 firmware. Any ideas on how to fix this? (PLEASE don't say to run a totally different DD/Tomato firmware because it's "better". I need to fix THIS 1 problem, not try to convince my company to switch everything to an entirely different set of problems.)

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• Fast file search algorithm for IP addresses

  - by Dave Jarvis

  Question What is the fastest way to find if an IP address exists in a file that contains IP addresses sorted as: 219.93.88.62 219.94.181.87 219.94.193.96 220.1.72.201 220.110.162.50 220.126.52.187 220.126.52.247 Constraints No database (e.g., MySQL, PostgreSQL, Oracle, etc.). Infrequent pre-processing is allowed (see possibilities section) Would be nice not to have to load the file each query (131Kb) Uses under 5 megabytes of disk space File Details One IP address per line 9500+ lines Possible Solutions Create a directory hierarchy (radix tree?) then use is_dir() (sadly, this uses 87 megabytes)

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• libpcap IP Packet Reassembly

  - by holydiver

  Hello all, I'm looking for a sample code for IP packet reassembly in C with libpcap*. Is IP packet defragmentation implemented in libpcap library officially? I've found this proposal : http://www.mail-archive.com/[email protected]/msg02991.html[this][1] . Are there any implementation of defragmentation of IP packets. [1]: http://www.mail-archive.com/[email protected]/msg02991.html [+] *The reason for looking for the sample code is just for fun and learning and i don't want to spend too much time for writing code for IP packet reassembly.

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• Most efficient way to store IP Address in MySQL

  - by ensnare

  What is the fastest way to store and retrieve IP addresses in MySQL? Right now I'm doing: SELECT * FROM logins WHERE ip = '1.2.3.4' Where ip is a VARCHAR(15) field. Is there a better way to do this? I'm using Python. Thanks.

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• Distinguish the between intranet and official IP addresses

  - by Saravanan A

  How can I find out whether a given IP address is an official internet address or an internal intranet IP address?

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• Windows - VBScript - Determine IP address of computer on network

  - by tward

  I have written some VBScripts to automate tasks that I perform on computers over the network. These work great for most tasks however within our network we have problems with the IP address in DNS being correct all the time. This mainly occurs with laptops where we have different IP ranges for machines on the wireless and wired network. For example a machine may boot up wired in the morning and get an IP address: 10.10.10.1 When it switches to wireless it will obtain an address in a different subnet: 10.11.10.1 When you try to connect to that machine it still returns the old IP address (10.10.10.1) even though the computer now has a new one. I have found that I can still connect to that computer's C$ share via \computer name\c$ even though the machine does not ping. Obviously there is some other kind of address resolution going on, my question is how do I harness this to allow my VBScripts connect to WMI? Thanks!

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• Block specific IP block from my website in PHP

  - by iTayb

  I'd like, for example, block every IP from base 89.95 (89.95..). I don't have .htaccess files on my server, so I'll have to do it with PHP. if ($_SERVER['REMOTE_ADDR'] == "89.95.25.37") die(); Would block specific IP. How can I block entire IP blocks? Thank you very much.

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• Ubuntu second static IP, ifconfig, /etc/network/interfaces

  - by Schmoove

  I would like to add a second static IP to my local Ubuntu 11.10 desktop machine and have it automatically available after rebooting. So far I am successfully using ifconfig to to temporarily set up an alias for my primary network interface: # ifconfig eth1:0 192.168.178.3 up # ifconfig eth1 Link encap:Ethernet HWaddr c8:60:00:ef:a3:d9 inet addr:192.168.178.2 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::ca60:ff:feef:a3d9/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:61929 errors:0 dropped:0 overruns:0 frame:0 TX packets:64034 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:45330863 (45.3 MB) TX bytes:28175192 (28.1 MB) Interrupt:42 Base address:0x4000 eth1:0 Link encap:Ethernet HWaddr c8:60:00:ef:a3:d9 inet addr:192.168.178.3 Bcast:192.168.178.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 Interrupt:42 Base address:0x4000 However, when I add the following to /etc/network/interfaces, the alias is not up and running as expected after a reboot: # vi /etc/network/interfaces auto eth1:0 iface eth1:0 inet static address 192.168.178.3 netmask 255.255.255.0 I would like to know what to configure to get this to work. As a side note, I am running gnome shell.

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• private class calling a method from its outer class

  - by oxinabox.ucc.asn.au

  Ok, so I have a class for a "Advanced Data Structure" (in this case a kinda tree) SO I implimented a Iterator as a private class with in it. So the iterator needs to implement a remove function to remove the last retuirned element. now my ADT already impliments a remove function, and in this case there is very little (thinking about it, i think nothing) to be gain by implimenting a different remove function for the iterator. so how do I go about calling the remove from my ADT sketch of my struture: public class ADT { ... private class ADT_Iterator impliments java.util.Itorator{ ... public void remove(){ //where I want to call the ADT's remove function from } ... public void remove( Object paramFoo ) { ... } ... } So just calling remove(FooInstance) won't work (will it?) and this.remove(FooInstance) is the same thing. what do i call? (and changign the name of the ADT's remove function is not an option, as that AD T has to meet an Interace wich I am note at liberty to change) I could make both of them call a removeHelper functon, I guess...

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• IP address spoofing

  - by SomeOne

  Is it true if I want to make ip spoofing program I need only a program that can change my machine ip address??? if true how can i use System.Net - IPAddress Class to set the ip address ....

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• How can we do packet marking (TOS, identifier, flag fields) for IP address using java code

  - by raju

  use of TOS, identifier, flag fields for IP address using java code for deterministic packet marking

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• Connecting to same public IP from different locations yields different results

  - by DHall

  Since yesterday I've been unable to access one of my favorite time-wasting sites, boston.com. It starts to load but then it gets redirected to pagesinxt or something like that. After some investigation, I've narrowed it down to an issue with cache.boston.com, but only from my work location. I found the IP (216.38.160.107) , but even that doesn't work correctly from here at work. When I do a telnet 216.38.160.107 80 GET http://cache.boston.com/universal/css/hp_bgcom.css from another location, I get a nice long CSS, as expected. From here, I get an error (trimmed for size): HTTP/1.1 400 Bad Request Your request could not be processed. Request could not be handled This could be caused by a misconfiguration, or possibly a malformed request. For assistance, contact your network support team. Is there any way I can troubleshoot this further on my end? Tracert doesn't tell me anything too useful: Tracing route to vwrpx1.ttn.xpc-mii.net [216.38.160.107] over a maximum of 30 hops: 1 * * * Request timed out. Since it's not really work-related, I don't really want to bring it up to our network team unless I know what's going on, or if there's some risk to the network (ex. malware or something)

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• "Ethernet" doesn't have a valid IP configuration

  - by Xuzuno

  I'm using an ethernet cord to connect to my internet and it has been working well until Thursday morning when I turned on my laptop (Windows 8) to see a yellow triangle sign in the bottom right hand corner, in front of the ethernet connected symbol. Since then I haven't been able been able to access the internet from my computer. When I hover over it, it says that it is an "Unidentified network" and there is "No internet access". I've run the Windows 8 troubleshooting and it says that the problem found was ""Ethernet" doesn't have a valid IP configuration", but I'm unsure how to fix it. I'm thinking that the problem is to do with my computer rather than my network, because I've tried another laptop (Windows 7) through the same ethernet cable and connection and the internet works fine on the other laptop. I've tried so many fixes that I've found online, with none of them actually working. Yesterday I even tried a full system reset, where I re-installed Windows 8, re-partitioned and wiped everything off the hard drive, but it still appears have the exact same problem. Today I also purchased and tried a new ethernet cable which didn't work, so I then purchased a USB to Ethernet adapter, to make sure that it wasn't my ethernet port on my laptop that was faulty. That didn't work either, and the same problem still remains. I feel like I've tried everything, so can someone please help me?

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• AWS Load Balancer with a static IP address

  - by user965904

  I have a set-up running on Amazon cloud with a couple of EC2 Instances running through a load balancer. It is important that the site has a unique(static) IP or set of IPs as I'm plugging in 3rd party APIs which only accept requests made from IPs which have been added to their whitelist. So basically unless we can give these 3rd parties a static IP or range of IPs that the requests from the site will always come from then we would be unable to make any calls to them. Anyone knows how to achieve this as I know that Elastic IPs are not compatible with load balancers? If I were to look up the IP of the load balancer DNS name (e.g. dualstack.awseb-BAMobile-ENV-xxxxxxxxx.eu-west-1.elb.amazonaws.com resolves to 200.200.200.200) would that IP be Static? Any help/advise is greatly appreciated guys.

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• .bat file to update loopback controller to external ip

  - by cable729

  Okay, so I've figured out how to get my external ip using wget: wget -q -O - http://whatismyip.com/automation/n09230945.asp that outputs the ip to the command console. adding currentip.txt to the end will write it to a text file. But what I want to do is use netsh interface ip set address name="Local Area Connection 2" source=static addr=[WHAT DO I PUT HERE] Also, a way to make the command prompt not flash would be nice too :)

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• class modifier issues in C# with "private" classes

  - by devoured elysium

  I had a class that had lots of methods: public class MyClass { public bool checkConditions() { return checkCondition1() && checkCondition2() && checkCondition3(); } ...conditions methods public void DoProcess() { FirstPartOfProcess(); SecondPartOfProcess(); ThirdPartOfProcess(); } ...process methods } I identified two "vital" work areas, and decided to extract those methods to classes of its own: public class MyClass { private readonly MyClassConditions _conditions = new ...; private readonly MyClassProcessExecution = new ...; public bool checkConditions() { return _conditions.checkConditions(); } public void DoProcess() { _process.DoProcess(); } } In Java, I'd define MyClassConditions and MyClassProcessExecution as package protected, but I can't do that in C#. How would you go about doing this in C#? Setting both classes as inner classes of MyClass? I have 2 options: I either define them inside MyClass, having everything in the same file, which looks confusing and ugly, or I can define MyClass as a partial class, having one file for MyClass, other for MyClassConditions and other for MyClassProcessExecution. Defining them as internal? I don't really like that much of the internal modifier, as I don't find these classes add any value at all for the rest of my program/assembly, and I'd like to hide them if possible. It's not like they're gonna be useful/reusable in any other part of the program. Keep them as public? I can't see why, but I've let this option here. Any other? Name it! Thanks

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• Dynamic picture that displays the visitors IP address?

  - by Rob

  I see this a lot now, jpg files displaying your IP address. To you of course, not to others, they would see their own For example: How is this even possible? If this is possible, would it be possible to log an IP into a MySQL database from the picture as well? Is my IP getting logged when I view this?

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• Java: How do I get the IP of the local interface that can reach a remote IP?

  - by Per Fagrell

  I have a Java application that registers a server component in a service provider, and then sends the service name to a client. The client uses the service name to get an address out of the service provider to the server. However, the server has several interfaces only 1 of which the client get get at, so the service must be registered with the right IP. We discovered the client through a broadcast, so I have the client IP and an Enumeration of the computers network interfaces. How do I match the IP to an interface, not knowing what the netmask of the client IP is? Spontaneously I imagine turning all the addresses to ints and chomping the local ips with their netmask and looking for a 'best match', but I wonder if there is a better way? (this is an enterprise(tm) solution, so cutting out the service provider isn't an option, at least not w/o a political campaign first ;) )

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• php web based portal authentication through IP.

  - by user434885

  i have a web portal running which involves basic data entry. The issue being that this is highly sensitive data. And the credibility of the data entry personel is very low. Therefore i have implemented recording of IP when an entry is made. The Problem i am facing is if this if this person starts forwarding his IP from a proxy server then i am unable to track authenticity of the data. How do i detect if the IP forwarding is happening/ get the real ip address of the person.

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• Cannot access personal website from home IP. More details inside.

  - by GX67

  This is a recent problem I've been having. My site can be accessed from almost everywhere else except from my home IP, where I do most of my editing/updating, etc. I've tested my connection from my school's network, a friend's connection from out of state (multiple states), and through a tethered connection with my friend's Android. It works in all those cases, both viewing, accessing the cPanel, and using FTP. Here's the problem that happens to me when I try to view it from my home IP: The page times out in Firefox, IE, and Chrome. Using the cmd, I ran tracert and ping, both as failed attempts. Log here. downforeveryoneorjustme.com says my site is up. So do the other site checkers. I can't access my cPanel or FTP accounts. I can't access the host site. (I use perfectz.info for hosting, and I can't access their site either.) System settings: No firewall enabled. Ports are seemingly properly forwarded. (e.g. The ports are open in the router settings, and are open everywhere else.) I have an email forwarder set up from the cPanel that works just fine. (i.e. I can receive emails sent to that address. If any other information is needed, I'll do my best to provide it. UPDATE @ilhan: I use two things: 1) The site cPanel from in-browser. 2) Dreamweaver CS5 FTP. @Matthias: I tested both, and it passes the dual stack with a 10/10. What should I do then?

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