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• Why can a network address not be a valid host address?

  - by Goblinlord

  So... I have studied for CCNA and such and been working with IP networking at the least the past 8 years or so. I have always seen and been told that the network address for a subnet is not a valid host address. Now first I will start by saying I know this is true. My question is more... is there a technical reason it can not be used or was it just arbitrarily agreed upon when the specification was designed? I understand why a broadcast address can not be used (because it is ACTUALLY used). The thing is when I see a network address used it is normally only in routing which is specifically using NETWORK addresses. This being the case, (network addresses being used only when you are expecting a network address) is there some technical reason that they could not have the network address be an actual valid host address?

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• Finding out if an IP address is static or dynamic?

  - by Joshua

  I run a large bulletin board and I get spammers every now and again. My moderation team does a good job filtering them out but every time I IP ban them they seem to come back (I'm pretty sure it's the same person on some occasions, as the post patterns are exactly the same as are the usernames) but I'm afraid to ban them by IP address every time. If they are on a dynamic IP address, I could be banning innocent users later down the line when they try to get to my forum through SERPs, but if I ban only via static IPs I know that I'm only banning that one person. So, is there a way to properly determine if an IP address is static or dynamic? Thanks.

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• How I can I get my home network's IP address from a shell script?

  - by Steven Stewart-Gallus

  I have an account at a server at school, and a home computer that I need to work with sometimes. I have exchanged keys, and now only have one problem. While my school account has a name associated with it, "account_name@school", my home network does not. My plan is to have a script that every hour retrieves my home network's IP address, ssh'es into my school account and updates my ssh config file storing my home network's IP address. How can I retrieve my home computer's IP address from a shell script? P.S. Is this a sensible plan?

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• What would be the best schema to store the 'address' for different entities?

  - by Cesar

  Suppose we're making a system where we have to store the addrees for buildings, persons, cars, etc. The address 'format' should be something like: State (From a State list) County (From a County List) Street (free text, like '5th Avenue') Number (free text, like 'Chrysler Building, Floor 10, Office No. 10') (Yes I don't live in U.S.A) What would be the best way to store that info: Should I have a Person_Address, Car_Address, ... Or the address info should be in columns on each entity, Could we have just one address table and try to link each row to a different entity? Or are there another 'better' way to handle this type of scenario? How would yo do it?

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• Can a MAC address be used as a reliable part of a rights management (DRM) scheme?

  - by Jarrod Mosen

  We're currently writing some software that we want to protect. We thought that registering a user's MAC address in a database upon activation of the software seemed viable; we can profile and grab that with a Java applet, (is there a better way?) so getting it isn't too much of a problem. However, we want their computer to only run the application, and download application files/updates from the server when their MAC address has been verified with their one on-file. We understand that this means a lockdown to one computer, but special changes can be made on request. What would be the best way to verify their MAC address, to see if it exists in the database, and then serve them the files to run the application? (And to simply run it on subsequent requests, to prevent re-downloading.)

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• How do game trainers change a address in memory thats dynamic?

  - by GameTrainersWTF

  Lets assume i am a game and i have a global int* that contains my health. A game trainers job is to modify this value to whatever in order to achieve god mode. I've looked up tutorials on game trainers to understand how they work, and the general idea is to use a memory scanner to try and find the address of a certain value. Then modify this address by injecting a dll or whatever. But i made a simple program with a global int* and its address changes every time i run the app, so i don't get how game trainers can hard code these addresses? Or is my example wrong? What am i missing?

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• How do game trainers change an address in memory that's dynamic?

  - by GameTrainersWTF

  Lets assume I am a game and I have a global int* that contains my health. A game trainer's job is to modify this value to whatever in order to achieve god mode. I've looked up tutorials on game trainers to understand how they work, and the general idea is to use a memory scanner to try and find the address of a certain value. Then modify this address by injecting a dll or whatever. But I made a simple program with a global int* and its address changes every time I run the app, so I don't get how game trainers can hard code these addresses? Or is my example wrong? What am I missing?

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• state: pending & public-address: null :: Juju setup on local machine

  - by Danny Kopping

  I've setup Juju on a local VM inside VMWare running on Mac OSX. Everything seems to be working fine, except when I deployed MySQL & WordPress from the examples, I get the following when I run juju status: danny@ubuntu:~$ juju status machines: 0: dns-name: localhost instance-id: local instance-state: running state: down services: mysql: charm: local:oneiric/mysql-11 relations: db: wordpress units: mysql/0: machine: 0 public-address: 192.168.122.107 relations: db: state: up state: started wordpress: charm: local:oneiric/wordpress-31 exposed: true relations: db: mysql units: wordpress/0: machine: 0 open-ports: [] public-address: null relations: {} state: pending state: pending and public-address: null Can't find any documentation relating to this issue. Any help very much appreciated - wonderful idea for a project!

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• PSA: OpenJDK OCA Submission E-Mail Address

  - by $utils.escapeXML($entry.author)

  If you're coming new to OpenJDK and are reading How to contribute page, you'll quickly notice that item 0 contains the following section "If you haven't yet signed the Oracle Contributor Agreement (OCA) then please do so, scan it and e-mail the result to oracle-ca_us(at)oracle.com."That e-mail address here used to be a sun.com address back when OpenJDK started, but that changed a little while ago. So if you encounter e-mail trouble trying to submit your OCA in order to hack on OpenJDK, please check if you're trying to send it to the correct e-mail address.

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• Why do the interfaces show ipv6 address along with ipv4

  - by nixnotwin

  I have manually specified only ipv4 address for my interfaces. But all the interfaces automatically show inet6 address as well. Does it mean that ubuntu starts an ipv6 tunnel by default. If it does, isn't it dangerous, as ipv6 assigns public ips for all LAN clients. I only have a firewall on my NAT router, and my clients, who's interfaces show ipv6 address, do not have firewalls. Here is a screenshot: eth0 Link encap:Ethernet HWaddr 34:dc:47:2e:ad:13 inet6 addr: fe80::28cf:38ff:fb7b:da19/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:5783 errors:0 dropped:0 overruns:0 frame:0 TX packets:6098 errors:0 dropped:0 overruns:0 carrier:1 collisions:0 txqueuelen:1000 RX bytes:2961324 (2.9 MB) TX bytes:1573757 (1.5 MB) Interrupt:46 Note: For privacy reasons I have modified the HWaddr and inet6 addr values.

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• help redirecting IP address

  - by Alice

  Google has indexed the IP address of my site rather than the domain, so now I'm trying to set up a 301 redirect that will redirect the IP address and all subsequent pages to the domain. I currently have something like this in my .htaccess file (however don't think it's working correctly?): RewriteCond %{HTTP_HOST} ^12.34.567.890 RewriteRule (.*) (domain address)/$1 [R=301,L] I've used various redirect checker tools and keep getting the message: "... not redirecting to any URL or the redirect is NOT SEARCH ENGINE FRIENDLY" Am I doing something wrong or is there something else I should be trying? Thanks! Alice

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• Define outgoing ip address when using ssh

  - by Mark

  I have an ubuntu server machine (12.04) with 4 IP addresses for different websites that require unique ssl certificates. I sometimes ssh out from this box and the box I am going to I have to tell it what IP address I will be coming from. How do I specify which of the 4 ip addresses I want to use as my outgoing IP address? If i do an ifconfig it appears that I am going out as the last ipaddress. I guess you would want to specify either the address or the interface.... Thanks in advance! -Mark

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• Feedburner is Displaying an Inactive Email Address When Logged In

  - by Cynthia

  I have set up a Feedburner subscription through my Google account login. For some reason Feedburner displays an old inactive email address in the top right when logged into Feedburner. I'm concerned since I don't have access to this email account. If for any reason I need to move my Feedburner Feed I'm concerned I'll need to access this email account which is impossible. My email address is correct in every other Google account, profile etc. and has been updated to a working and correct email address. How can I change this? Do I need to be concerned?

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• Address Book Authentication

  - by Gus E

  I just upgraded to Ubuntu 14.04.1 and run Gnome Shell. I am consistently getting a pop up window prompting me for my Gmail address book authentication. The window pops up the moment I type something into gnome shell after hitting the super key. I'm assuming that Ubuntu wants to search my address book for people to include in the search. I have opened up the settings and deleted my account from the online accounts section and rebooted, nothing seems to stop the popup. Where is it getting my email address from? Most importantly, how to I stop this super annoying popup from appearing?

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• Make Google Chrome's address bar prefer page titles to domain names when offering completions?

  - by Ryan Thompson

  I've recently switched from Firefox to Chrome, and the thing I miss most from Firefox is the "Awesome Bar" that suggests completions for what I type primarily based on page titles, and then secondarily based on domain names. Chrome offers both matching URLs and titles, just like like Firefox, but Chrome seems to always prefer a matching domain name over a matching page title or a match to another part of the URL (besides the domain), no matter how many times I pass over the former for the latter. In fact, Chrome also prefers to suggest a search rather than matching anything other than a domain name. So is there any hidden preference I can change to tell Chrome that I care more about page titles than domain names? Example: I want to go to Google Reader, so I press Control+L and begin typing "reader". The URL for google reader is http://www.google.com/reader/view/#overview-page, so the domain name is www.google.com, which does not contain the word "reader". So the first option that Chrome suggests is either another site that has "reader" as part of the domain, or a search for "reader" with the default search engine. No matter how many times I scroll down and select Google Reader, Chrome never "learns" that that's what I want.

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• In linux, how can I get my IP address - ifconfig and ip addr show are not working

  - by naspinski

  This should be simple, but the machines we ssh into don't seem to have the regular commands. Are there any other simple ways I can use to get my IP?

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• Which subnet masks are valid for a subnetted Class B address?

  - by Daddy Warbox

  Yes, this is a school question, and yes I already know the correct possible answers (supposedly), so I'm not going to bother posting them. Instead, I just want to understand the meaning of this question. I know what class B addresses are, and what valid class B subnet addresses are. I guess one way to define my question is to ask why the answer "255.255.0.0" is wrong, necessarily? That seems to defy my understanding, or else some part of my brain is just not registering the question correctly. Thanks in advance.

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• What can I use to monitor which IP address w/name resolution is connected to each PID?

  - by supercheetah

  This would be for under Linux particularly. Is there a tool out there, or a script that I could use to monitor IP connections--with name resolution--and, see which process they're connected to? Right now I'm using this: watch -d netstat -peeW --numeric-hosts --inet But that doesn't give me host resolution. I was thinking of writing up a script with sed or something, but that seemed like more work than it needed to be.

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• Is there a screensaver that displays the IP address in quite large font? (Win XP) [closed]

  - by neonninja

  Preferably one that doesn't make blasé animations a mandatory option.

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• Where can I find a screensaver that displays the IP address in quite large font? (Win XP)

  - by neonninja

  Preferably one that doesn't make blasé animations a mandatory option.

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• Find an old static IP address on a mac backup?

  - by Joe

  I have an old backup of a mac via time machine, and I was wondering if there is some sort of accessible file that would have the static IP of the old computer it was backed up from. If you are curious, I am in IT and it is a PITA to get a new static IP here. I am just trying to use the old one to save some hassle. I've tried searching through the system log with no success (but I might be doing it wrong- grep with a regexp for an IP). Thanks!

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• Subdomain still times out after being set up a month ago

  - by user8137

  I would like to use the subdomain www.high-res.domain.com to be accessed by external customers with specific permissions to access the site (like FTP). We use Network Solutions to house domain.com. We recently added a new IP address to point to www.high-res.domain.com. I gave the IP address to the company that hosts our website. I pinged www.high-res.domain.com and it points to the correct IP address but still times out. It’s been a few weeks now and when you ping it, it still times out. C:\>ping XXX.XXX.X.XXX Pinging XXX.XXX.X.XXX with 32 bytes of data: Request timed out. Request timed out. Request timed out. Request timed out. Ping statistics for XXX.XXX.X.XXX: Packets: Sent = 4, Received = 0, Lost = 4 (100% loss). tracert times out as well. I even went to DNS tools and a few other sites for checking this and it shows the same thing. I recently went into the DNSmgmt on our server (wink2k3sp1) and created an A record under the DomainDnsZones which translated to a CNAME when you look at it. Under the domain it has two entries, one to the subdomain and the other to the website host. Each has separate IP addresses. Is this correct?

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• how to get ip address from sock structure in c ?

  - by REALFREE

  I'm writing simple server/client and trying to get client ip address and save it on server side to decide which client should get into critical section. I googled it several times but couldn't find proper way to get ip address from sock structure. I believe this is a way to get ip from sock struct after server accept request from client more specifically in c after server execute csock = accept(ssock, (struct sockaddr *)&client_addr, &clen) Thanks

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• Python and libpcap. find source mac address of packet.

  - by Shamanu4

  Hello! I'm writing python program to build mac-address cache using pcap. But pcap module for python has no good documentation. I have found this page http://pylibpcap.sourceforge.net/ with code example and it works fine. Can anybody modify this example to make it able to show the source mac-address for each packet? Or point me to the documentation where I can read about it ...

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• how to find the address of data in memory?

  - by blood

  i need to find a way how to find the address's for value of another program. i find the address before hand but i don't know how to find them again after i close and reopen the program with out searching for them again (i need the program to find them on it's own). anyone know how i can do this (sorry if im unclear i don't know how to explain it really) if your confused just ask and i'll try to make it clear im using C++

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