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• Rapidly changing public IP addresses on certain networks?

  - by zenblender

  I run/develop an online game where many of our users are in southeast asia. I recently went to southeast asia and made an alarming discovery. Anywhere I got internet access, whether it was via 3G, a LAN in a hotel, or wifi in a cafe, both in Singapore and the Philippines, I noticed that my IP address was changing CONSTANTLY. I mean the public IP address, not the private one. I could load a page like whatismyip.com and just hit reload and see a new IP address show up every 5-10 seconds! This has lots of consequences for my online game, as many things "break" if the IP address changes for a given user. Basically, I would like to know more about this. Is there a name for the kind of network or router or paradigm that causes this, so I can read up on it? I don't understand WHY a network would function this way. Does it do this on purpose? Is it for security reasons? Is it to anonymize and protect the identity of the users? Or is it just an "old" method that is mostly obsolete in the rest of the world? Thanks for any info that will help me to understand.

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• Ping server NETBIOS name returns wrong IP and "Destination host unreachable"

  - by music2myear

  Problem server is Windows 2008 R2 VM running on VMWare ESXi 4 host. Single network adapter manually assigned single IP address (192.168.1.11). When I ping the server from any other network computer, it returns 192.168.1.124 and "Destination host unreachable". Yesterday I found a second network adapter assigned to this server with an IP of 169.254... indicating it had no real valid IP. Using the MAC addresses I determined which adapter was not needed/not wanted, and removed it using VMWare systems. This is the network Printer Server and, understandably, nothing is printing right now. I've looked at the solutions here Why was my ping answered by a different IP address than the one pinged? and they aren't applicable to my situation for the following reasons: Output of arp -a on another computer returns the correct IP address (.1.11) assigned to the correct MAC address, the incorrect IP .1.124 is not listed, and the MAC of the network adapter I removed yesterday is not listed at all. I checked out the Microsoft KB article which listed pretty much my exact symptoms ( http://support.microsoft.com/kb/981953 ) and it says to check binding orders and look for hidden adapters. But there are no hidden adapters, and there is only one Network Adapter listed in the Binding Order list. Essentially, I can communicate from the server TO any other network device, but I cannot communicate from any other network device TO the server. Help! UPDATE: Solution found, see this solution for the details.

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• ADSL Modem/Router sometimes hands out incorrect IP addresses

  - by Peter Keevill

  My setup is as follows:- Main ADSL modem / router (switch) configured as DHCP server with address range 192.168.0.25-60 The office machines are configured with fixed IP ( not in the same address pool of course ) and hard wired to this router. A wireless access point ( Router ) is connected to provide Internet access for guests in a separate area. This router is NOT configured as a DHCP server. Wireless authentication is turned off. IP address lease times are set to 4 hours. Sometimes guests are able to connect to the wireless access point but they are not given a valid IP. They get 169.x.x.x addresses. Rebooting their machines does not resolve the problem. The only way to resolve is to reboot the main ADSL/router which is often frustrating for other users who are successfully connected with valid IP and DG. The problem seems to occur more frequently to Apple/Mac guests although it also sometimes occurs with Win machines. I personally use Ubuntu on my Laptop and thus far, never have had any problem connecting and getting a valid IP address in the guest area. One further point of note which may give a clue is that certain guests ( always Apple/Mac ) get lease times of 90 days. However, this does not 'stack out' the number of available addresses and of course, rebooting the router clears them until the next time they login.

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• Discover the public ip of a network without being connected

  - by Martin Trigaux

  Let say, I'm next to a network and can see the traffic (with airodump or similar tool) but can not decipher it (because I am not connected on the network). Is it possible to discover the public ip address of the network ? I know the MAC address of the users connected on the network but do I know the one of the router ? If yes, maybe there is a way to do the matching. I know IP addresses are not forever but some addresses are static and never change. Maybe there is a database of MAC address having recorded that. Google has a database that match MAC address and geographical coordinates so why not with IP addresses ? Other idea, if I know where am I, I can maybe guess the IP range used in the city by the ISP (is it findable ?) and then try to "ping" each IP on the range (if it is a /24, it's possible, even /16 maybe). Will I get some information like the MAC of the box or see some traffic on the network ? These are two ideas I had. I don't know if they are doable, certainly not perfect. Do you think of some others ? By trying several methods, maybe I can get a guess with a bit of luck. Thank you

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• How to prevent response to who-has requests on virtual eth interface?

  - by user42881

  Hi, we use small embedded X86 linux servers equipped with a single physical ethernet port as a gateway for an IP video surveillance application. Each downstream IP cam is mapped to a separate virtual IP address like this: real eth0 IP address= 192.168.1.1, camera 1 (eth0:1) =192.168.1.61, camera 2 (eth0:2) =192.168.1.62, etc. etc. all on the same eth0 physical port. This approach works well, except that a specific third-party windows video recording application running on a separate PC on the same LAN, automatically pings the virtual IPs looking for unique who-has responses on system startup and, when it gets back the same eth0 MAC address for each virtual interface, freaks out and won't allow us to subsequently manually enter those addresses. The windows app doesn't mind, tho, if it receives no answer to the who-has ping. My question - how can we either (a) shut off the who-has responses just for the virtual eth0:x interfaces while keeping them for the primary physical eth0 port, or, in the alternative, spoof a valid but different MAC address for each virtual interface? Thanks!

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• Disable iPhone Yahoo contacts sync

  - by User

  Every time I plug in my iPhone, iTunes pops up a dialog asking for sync with Yahoo contacts. after I cancel, it pops up again, for 4-5 more times. But the 'Sync Yahoo!Address Book contacts' option is disabled in iTunes and I definitely don't want this to happen. If there any way to tell iTunes to stop trying to sync with Yahoo?

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• How do I set up a public server on a network?

  - by tyjkenn

  I am trying to set up a personal cloud server with OwnCloud on Ubuntu. LAMP is all set up. I was able to access it using the external IP address when I connected it directly to the modem, but what if I what if I want my server to share a LAN? I still want it accessible over the internet, but then if I go to the IP address from a web browser, it just tries to log into to router admin tools. The internal IP address works across the LAN, but I want to be able to access it from anywhere. This may be simple and I may be over-thinking it, but how do access my server? The router I am using is ASUS WL-520GU.

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• Plesk 10 Postfix with multiple IP adresses and SSL certificates

  - by JulianB

  We are currently running a root server with Debian 6 and Plesk 10.4.4. We have some virtual hosts using one IP adress (shared) - e.g. example1.com - and another virtual host using a dedicated IP address (example2.com). Is there a way to configure postfix to do the following Always use the IP address of the virtual host to which the e-mail account belongs (so that an e-mail from [email protected] will originate from the shared IP-Address and an e-mail from [email protected] will originate from the dedicated IP? Use different certificates for TLS for example1.com and example2.com? If the latter is not possible: Could any problems arrive when using example1.com as certificate for example2.com users? Of course, example2.com users would have to configure their clients to use example1.com as the SMTP server name to avoid annoying security warnings. But if we still would be able to get the effect of the first point that would still be acceptable.

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• Why would my router have different MAC addresses for IP and IPv6 transactions?

  - by user329161

  Today I was using tcpdump and I noticed my computer was having IPv6 traffic with a particular MAC address that I could not match with an IP using nmap or arping. After looking at the tcpdump logs a little more closely, I figured out it was another MAC address my router was using but exclusively for IPv6 traffic. 22:49:01.936830 90:0d:cb:ff:31:91 (oui Unknown) > 33:33:00:00:00:01 (oui Unknown), ethertype IPv6 (0x86dd), length 158: fe80::920d:cbff:feff:3191 > ip6-allnodes: ICMP6, router advertisement, length 104 Why would a router offer a different MAC address for IPv6?

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• How to access a site in IIS with no DNS mapping

  - by CiccioMiami

  In my IIS 7.5 hosted in a Windows Server 2008 R2 I have several websites with no DNS address assigned. Let's take for instance the site (as named in IIS) with site name mySite. I have for this site the standard binding with no host name. Suppose that my server IP address is, for instance, 101.22.23.01. Therefore it seems logic to me that in order to access the website, I should place in the address bar of my browser: [IP_address]/[sitename] in this case: 101.22.23.01/mySite but it does not work. Shall I specify something else in the bindings?

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• VirtualBox cloned Ubuntu Server network error

  - by Luke

  I run a number of virtual servers on my network and I want to be able to easily clone base installations of Ubuntu Server. I use the VBoxManage command to clone the actual hard disk and I then create a new profile for my VM and copy over the settings of the original VM. However, when I boot into the cloned VM, there seems to be a network problem. When I issue a PING I get the message "Network unreachable". I traced it down to the fact that the virtual network card of the cloned VM has a different MAC address then the original VM. When I copy the MAC address the clone seems to work fine. How can I have the cloned VM have it's own MAC address?

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• Tracking my home IP from anywhere on the internet?

  - by oKtosiTe

  I have an ISP that serves semi-permanent IPv4 addresses. They can't promise fixed IP addresses, but unexpected changes are quite rare. This begs me to ask however: what would be the easiest/most reliable way to track my home IP address so I can access my (Windows 7) home server even in the case of an address change? Please note: for reasons that I don't want to go in to, I'd like to avoid using any "dynamic DNS" type services. Instead I'd prefer some way to perhaps have the home server leave an occasional/triggered "address stamp" on a remote, off-site server (by SSH, HTTP post or similar, preferably over an encrypted connection).

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• IP address spoofing using Source Routing

  - by iamrohitbanga

  With IP options we can specify the route we want an IP packet to take while connecting to a server. If we know that a particular server provides some extra functionality based on the IP address can we not utilize this by spoofing an IP packet so that the source IP address is the privileged IP address and one of the hosts on the Source Routing is our own. So if the privileged IP address is x1 and server IP address is x2 and my own IP address is x3. I send a packet from x1 to x2 which is supposed to pass through x3. x1 does not actually send the packet. It is just that x2 thinks the packet came from x1 via x3. Now in response if x2 uses the same routing policy (as a matter of courtesy to x1) then all packets would be received by x3. Will the destination typically use the same IP address sequences as specified in the routing header so that packets coming from the server pass through my IP where I can get the required information? Can we not spoof a TCP connection in the above case? Is this attack used in practice?

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• Implementing Autocompletion in iPhone UITextField for contacts in address book

  - by nacho4d

  Hi, I would like to have a UITextField or UITextView in where as I do some input, alternatives will appear something similar to when you type an address in Mail Application, alternatives appear down and is possible tap them so get a better input user interface.(since there is no need to type the complete word or address or phone number) I do know how to fetch data from Address Book framework, also how to input text in UITextField/UITextView and its delegates but I don't know what kind of structure to use for fetching and showing data as the user do his/her input. I know basic CoreData if this matters, I hope I can get some help. UPDATE (2010/3/10): I don't have problem make a native-like GUI but I am asking about the algorithm, does any body knows what kind algorithm is best for this thing? maybe some binary tree? Or should I just fetch data from coredata everytime? Thanks Ignacio UPDATE (2010/03/28): I've been very busy these days, so I have not tried UISearchResults but it seems fine to me. BUT I wonder was there a necessity of deletion of the wining answer? I don't think is fair my reputation went down and couldn't see the winning answer. ;(

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• WCF sending the same exception even if the service endpoint address is valid

  - by ALexr111

  Hi, I'm running into a really strange problem with WCF. I need to implement some recovery behavior for WCF service if not reachable endpoint IP address received or service can not bind. The flow is simple if the application fail on exception on service creation it terminate it and request from user another IP address and perform another attempt to create the service. (The code snippet below). If the address is not valid I get "A TCP error (10049: The requested address is not valid in its context) occurred while listening on IP Endpoint=.121.10.11.11" exception, but for any reason if I try the second attempt with valid address I've got the same exception with wrong IP address from previous attempt. Here is a code: ServiceHost service = null; try { Uri[] uris = { new Uri(Constants.PROTOCOL + "://" + address + ":" + port) }; service = new ServiceHost(typeof(IRemoteService), uris); NetTcpBinding tcpBinding = WcfTcpRemoteServicesManager.LessLimitedNewNetTcpBinding(int.MaxValue, int.MaxValue, int.MaxValue); ServiceEndpoint ep = service.AddServiceEndpoint(implementedContract.FullName, tcpBinding, serviceName); var throttle = service.Description.Behaviors.Find<ServiceThrottlingBehavior>(); if (throttle == null) { throttle = new ServiceThrottlingBehavior { MaxConcurrentCalls = Constants.MAX_CONCURRENT_CALLS, MaxConcurrentSessions = Constants.MAX_CONCURRENT_SESSIONS, MaxConcurrentInstances = Constants.MAX_CONCURRENT_INSTANCES }; service.Description.Behaviors.Add(throttle); } service.Open(); } catch (Exception e) { _debugLog.WriteLineMessage( "Failed to open or create service exception. Exception message:" + e.Message); if (service!=null) { try { service.Close(); } catch (Exception) { service.Abort(); service.Close(); throw e; } } } Thanks

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• Does Email Address Obfuscation Actually Prevent Spam?

  - by Jason Fitzpatrick

  Many people obfuscate their email addresses–typing out someguy (at) somedomain (dot) com, for example–to project themselves from SPAM bots. Do such obfuscation techniques actually work? Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-drive grouping of Q&A web sites. HTG Explains: Does Your Android Phone Need an Antivirus? How To Use USB Drives With the Nexus 7 and Other Android Devices Why Does 64-Bit Windows Need a Separate “Program Files (x86)” Folder?

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• Address Regulatory Mandates for Data Encryption Without Changing Your Applications

  - by Troy Kitch

  The Payment Card Industry Data Security Standard, US state-level data breach laws, and numerous data privacy regulations worldwide all call for data encryption to protect personally identifiable information (PII). However encrypting PII data in applications requires costly and complex application changes. Fortunately, since this data typically resides in the application database, using Oracle Advanced Security, PII can be encrypted transparently by the Oracle database without any application changes. In this ISACA webinar, learn how Oracle Advanced Security offers complete encryption for data at rest, in transit, and on backups, along with built-in key management to help organizations meet regulatory requirements and save money. You will also hear from TransUnion Interactive, the consumer subsidiary of TransUnion, a global leader in credit and information management, which maintains credit histories on an estimated 500 million consumers across the globe, about how they addressed PCI DSS encryption requirements using Oracle Database 11g with Oracle Advanced Security. Register to watch the webinar now.

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• Two domains, two servers, one dynamic IP address

  - by giantman

  I have two domains hi.org and bye.net and one dynamic IP address and two servers. I want to attach one domain bye.net to server1 and hi.org to server2. I'm using Apache wamp 2.0i. I have two servers behind one router with a dynamic IP address #httpd.conf file additions <IfModule mod_proxy.c> ProxyRequests Off <Proxy *> Order deny,allow Allow from all </Proxy> </IfModule> #vhost file additions NameVirtualHost *:80 #default <VirtualHost *:80> DocumentRoot "c:/wamp/www/fallback" </VirtualHost> # Server 1 <VirtualHost *:80> DocumentRoot "c:/wamp/www" ServerName h**p://bye.net ServerAlias bye.net </VirtualHost> # Server 2 <VirtualHost *:80> ProxyPreserveHost On ProxyPass / h**p://192.168.1.119/ DocumentRoot "g:/wamp/www" ServerName h**p://hi.org ServerAlias hi.org </VirtualHost> After doing all this I fallback to server1 only I don't get the page hi.org I only get the page bye.net, I don't even get the default fallback page which gets executed when a person enters IP address but not the domain name. I use Windows 7 (server 2) and Windows XP (server 1) UPDATE: I needed to remove DocumentRoot "g:/wamp/www" line :D it was there by mistake! things are working fine now. But one thing: the URL gets replaced by the local ip address any way to not make that happen?

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• Display Driver stopped responding and recovered successfully- Blue Screen - HP Elite Book

  - by Fahad Saleem

  I have HP ELiteBook , this problem has become a routine headache for me (after every 20, 25 minutes_ - While using, suddenly everything hangs and black out goes around and then a message pop at the task bar below that display driver stopped ...and successfully recovered but the hangs and black screen continues and then the Blue Death Screen comes" and then i have no other option but to restart Is this a driver problem ? Hardware problem ? what should I do Please be specific , no stories and theories

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• Whats the difference between local and remote addresses in 2008 firewall address

  - by Ian

  In the firewall advanced security manager/Inbound rules/rule property/scope tab you have two sections to specify local ip addresses and remote ip addresses. What makes an address qualify as a local or remote address and what difference does it make? This question is pretty obvious with a normal setup, but now that I'm setting up a remote virtualized server I'm not quite sure. What I've got is a physical host with two interfaces. The physical host uses interface 1 with a public IP. The virtualized machine is connected interface 2 with a public ip. I have a virtual subnet between the two - 192.168.123.0 When editing the firewall rule, if I place 192.168.123.0/24 in the local ip address area or remote ip address area what does windows do differently? Does it do anything differently? The reason I ask this is that I'm having problems getting the domain communication working between the two with the firewall active. I have plenty of experience with firewalls so I know what I want to do, but the logic of what is going on here escapes me and these rules are tedious to have to edit one by one. Ian

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• PASSion Award and Tom Casey&amp;#146;s Keynote Address - Pass Summit 2009

  Tom Casey's keynote revealed Microsoft's plans to provide BI tools that help the power user and IT professional by adding additional functionality to a familiar tool like Excel. A PowerPivot demo showed how you can create Excel workbooks with billions of rows.

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• DD-WRT router causing IP address conflicts across network

  - by r.tanner.f

  My DD-WRT router has lost its mind! I just set up two DD-WRT routers, one as a WAP (working fine) and one in Client Bridge (routed) mode (the problem). Not long after setup I started seeing IP address conflicts on other machines. The event log always points the finger at my Client Bridge router's MAC address. Neighbour table overflow The log on my router is flooded with Neighbour table overflow errors. These start a minute or two after boot. The network is rather large, with +200 IP addresses being used in this subnet. The other router shows no such errors. Mass ARP requests from 1.1.1.1 I'm also seeing constant ARP requests (with the problem router's MAC address) from 1.1.1.1. Seems like it's bugging everything on the network for its MAC address and then promptly forgetting it (or never receiving a response). Configuration: Model: Buffalo N600 Firmware: DD-WRT v24SP2-MULTI (03/21/11) Wireless Mode: Client Bridge (routed) I'm not sure what configuration details are relevant and I'd rather not have comments flooded, so just ping me in this chat if you want to know something. Why is my router stealing IP addresses and how can I stop it?

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• website address point to localhost

  - by munir ahmad

  Today in firefox while surfing the internet, I opened a website it asked "This site may harm your computer" if you want to open this website add it in exception list. I added a website under exception list and trust this website. After that situation, whenever I opend this website, it always points toward the localhost untill internet connected. I have setup localhost through apache (xampp server). If internet not connected this website do not open anything but localhost still work as usaual. How can I remove this situation so that this website do not point to locathost? I am using winxp sp3. Same problem now appear in all browsers too.

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• subdomains to different VMs on one IP address

  - by efbenson

  I have a setup at home with an ESXi server Freenas server and several win7 clients. I have a domain refactoringme.com I set the @ and WWW domain record to my (current) IP address. I then forwarded port 80 to my local win2k3 server on my Linksys router and used host name matching to run the 5 test sites I have. That all works. Now I want to use the turnkey machines and move to dedicated VM servers. One for a wiki one for SVN etc. So how do I get www.refactoringme.com to go to one internal IP address and wiki.refactoringme.com to different internal IP address, while they both use the same external IP address? I added the additional record for wiki to my domain and pointed it to @. I figured it had to be involving a real firewall. So I installed PFSense on a VM and set it on the DMZ on my Linksys. From this point I haven't had any luck. I thought that maybe it would be in the DNS Forwarder or maybe in the Rules sections but neither have worked. Am I doing it wrong or on the right track but am missing something. Thanks for all the help.

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• Mac Book Refuses to Boot

  - by pas09

  I have a Macbook that has unfortunately died on me. I randomly got a pop up message that said I needed to restart my computer, and once I did, I was greeted with the blinking folder question mark start up screen. I've tried everything, including running Disk Utility repair and reformatting the hard drive and reinstalling OS X. All of my data is backed up and safe, I just need my computer to start again. Before I go off and buy a new hard drive, I wanted to see if there is anything I might have forgotten.

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