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• arp across subnets which devices can be detected?

  - by Gobliins

  i have some devices connected in the same physical network (LAN) but in different subnets. I want to detect them all with the ARP from my computer. My Computer is also in the same physical network but on a different subnet. ! The devices have no arp protocol installed (yet). Is it possible to detect the devices (with or withour ARP installed on every device)? If the devices have a MAC-address but no IP-address, can ARP still detect the machines?

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• Empathy minimizing automatically

  - by 168335

  I am able to login into empathy, but the thing is whenever i am clicking over it from the right top task bar so that I could open it and see who all are online, it opens just for a second and minimises automatically. I am still logged in only, no issues with that , but i am not able to open the client at all, its like i am restricted tot he panel and its notifications only whenever someone sends me a message. so can anyone suggest a method via which I can stop this automation of empathy?

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• A record not resolving

  - by user1561108

  I have a hosted domain at siteground. On this domain & host I have a subdomain with a wordpress install. I wish to move this blog to another host (hostgator), while keeping the domain with siteground. To do this I created a hosting account at hostgator, got it's ip address and set the A record in siteground's cpanel accordingly: subdomain.example.com 14400 A (ip of hostgator account) Going by this online traceroute tool the records appear to have been updated (over 4 hours ago now) as it now resolves to a theplanet.com server location which hostgator use yet the subdomain is still not resolving from a web browser. The account at hostgator has been setup and is navigable via ip address/~accountname. What's going wrong here? I should add the relevant DNS record at hostgator side looks like this: subdomain.example.com 86400 IN SOA ns483.websitewelcome.com. subdomain.example.com 86400 IN NS ns1.siteground145.com. subdomain.example.com 86400 IN NS ns2.siteground145.com. subdomain.example.com 14400 IN A 74.54.176.3 I'm not sure if the hostgator record should be classed as the SOA record but I don't know enough about it to be sure. Is this the source of the problem?

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• Searching Objects on SonicWALL (NSA 2600, SonicOS 6.1)

  - by Justin Scott

  Ok, this may sound like a dumb question, but does the SonicOS web interface not have a search option for object definitions? One of my clients recently decided to replace their Astaro Security Gateways with SonicWALL firewalls. These sit in front of a small data center full of servers and we have several hundred custom service and address definitions that need to be ported. The SonicOS interface provides a basic list for service and address definitions but no search option to be found. To make it worse, there is no option to list them all on one page (they're paginated 50 at a time) so I can't use the text search on the web browser either. The Astaro units have a nice search option on their definitions so perhaps I just got spoiled by their software. Am I missing something or is there some way to search for an object without paging through the list and finding an entry manually?

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• How can I redirect HTTPS(S) traffic to anothr gateway?

  - by PsyStyle

  I have a network like 192.168.0.0/15 with the default gateway set to 192.168.0.1. Al the workstations of the network use this gateway for all kind of accesses to the Internet. Now I am testing a new Internet connection with another provider and for this I am using a second gateway on the same subnet with 192.168.0.2 as IP address. I want to redirect only HTTP and HTTPS traffic to this second gateway without touching the address of the default gateway set inside every workstation. How can I accomplish this task? What I have to change inside the first's gateway firewall configuration or routes? I tried with a dnat like DNAT loc:192.168.0.1 loc:192.168.0.2 tcp 80 but nothing worked. I use Shorewall for simplicity in configuration but I can understand even theorical answers which I will try to adapt to my case

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• Upgraded from 10.04 to 12.04, how can I make Thunderbird marks the indicators envelope blue?

  - by josvazg

  Upgraded from 10.04 to 12.04 now I don't have notifications on incoming email to Thunderbird on the indicator bar, neither when thunderbird is running nor when it's not. None of the other similar questions answers have helped me. Still no blue envelope. I DO get a notification when the email comes as a temporary OSD, ut the envelope in the indicators menu does not get blue and there is no line for received email under "Mail" althougth it is working for Google Mail.

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• cannot using internet in VMWare

  - by user66247

  I am using VMware Workstation version 7 on Ubuntu 10.10. I installed Windows XP service pack 3 for guest os. Within VMWare, I am using bridge connection that I assigned static IP address to be able to ping host IP address but I cannot ping default router gateway. I also tried to command "/etc/init.d/vmware start" on terminal. All tasks are able to start successfully except "VM communication interface socket family" I am not sure that how to setup network for my VMWare by using wireless. Thanks in advance.

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• How to Correctly Optimize Title Tags

  With the SERPs becoming increasingly competitive, more and more businesses are turning to search engine optimization to help improve their rankings and drive more customers to their website. When optimizing a website one of the most important factors of on page optimization is the title tag. The title tag is the text that is the text that is displayed in the blue bar at the top of the browser window and is also displayed at the top of each result in the SERPs.

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• curl blocked at TMG firewall

  - by jemtube100

  i using TMG (threat management gateway) firewall at my web server. when i try to use Curl from outside, this firewall was blocked the connection. what rule/setting that i need to create at TMG to allow it. the error state as below : Refresh page: Search for the page again by clicking the Refresh button. The timeout may have occurred due to Internet congestion. Check spelling: Check that you typed the Web page address correctly. The address may have been mistyped. Access from a link: If there is a link to the page you are looking for, try accessing the page from that link. </UL> <HR color=#c0c0c0 noShade> <P id=L_defaultr_11>Technical Information (for support personnel)</P> <UL> <LI id=L_defaultr_12>Error Code: 403 Forbidden. The server denied the specified Uniform Resource Locator (URL). Contact the server administrator. (12202)

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• is using Hosts for resolving a sql-server more performant?

  - by Ice

  Hi, we have a legacy application which uses a access.mdb with hundreds of ODBC-connected tables on a sql-server. the access.mdb contains nothing else than these odbc-connections. Now we consider to use a virtual sql-servername for these odbc connections and resolve it in the local hosts-file with the ip-address of the real sql-server. Like this we can easy switch between a test-sql-database server and the the server for production in changing one single entry in the hosts. EVERYTHING works fine and now comes the question: Could it be that this is more performant because there is one single point on resolving the sql-server (name or ip-address)? Is there something like a network-cache / DNS-Cache? peace Ice

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• You cannot do cross joins in SQL Azure but there is a way around that....

  - by SeanBarlow

  So I was asked today how to do cross joins in SQL Azure using Linq. Well the simple answer is you cant do it. It is not supported but there are ways around that. The solution is actually very simple and easy to implement. So here is what I did and how I did it. I created two SQL Azure Databases. The first Database is called AccountDb and has a single table named Account, which has an ID, CompanyId and Name in it. The second database I called CompanyDb and it contains two tables. The first table I named Company and the second I named Address. The Company Table has an Id and Name column. The Address Table has an Id and CompanyId columns. Since we cannot do cross joins in Azure we have to have one of the models preloaded with data. I simply put the Accounts into a List of accounts and use that in my join.   var accounts = new AccountsModelContainer().Accounts.ToList(); var companies = new CompanyModelContainer().Companies; var query = from account in accounts             join company in                 (                       from c in companies                      select c                  ) on account.CompanyId equals company.Id             select new AccountView() {                                               AccountName = account.Name, CompanyName = company.Name,                                 Addresses = company.Addresses                         }; return query.ToList();   So as long as you have your data loaded from one of the contexts you can still execute your queries and get the data back that you want.

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• Gnome fallback move to workspace not working - Ubuntu 14.04

  - by iulianis

  I have recently switched to Ubuntu 14.04 but using the gnome fallback desktop environment. The thing that is not working for me is that when I right click on a window's top bar and then click Move to Workspace Up for example, it puts the window in that workspace but it also keeps it in the current workspace. I've tried all options but it just wouldn't work :( Anyone experienced the same and found a solution?

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• Postfix - How to process incoming emails?

  - by Borivojevic

  Hello Does anybody know how to process incoming emails for virtual mailboxes in postfix? I am building web application where users add new content by sending emails to application. Email address used for each user is custom (eg. [email protected]) and it is dynamically created as a Postfix virtual mailbox. User needs to be able to send email to his custom mailbox address ([email protected]) and i want to process each incoming email, parse it's contents and populate my database with data from email. I tried using Postfix After Queue filter but what i really wont is to process emails once they are saved in users virtual mailbox folder.

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• Can I set up two NICs bridged together and still SSH into the bridging machine?

  - by squinlan

  I have a ubuntu box setup with two NICs. I can bridge them together just fine, but I haven't been able to setup a way to SSH into the box once the connections are bridged together. Here's my /etc/network/interfaces: auto lo iface lo inet loopback auto eth1 iface eth1 inet manual auto eth0 iface eth0 inet manual auto br0 iface br0 inet static address 192.168.33.213 netmask 255.255.255.0 gateway 192.168.33.1 bridge_ports eth0 eth1 bridge_stp off bridge_fd 0 bridge_maxwait 0 This works just fine for bridging, but I'm not able to SSH into the box. I tried setting up another interface on one of the NICs: auto eth0:1 iface eth0:1 inet static address 192.168.33.215 netmask 255.255.255.0 gateway 192.168.33.1 But this really didn't help. Is it possible to ssh into a machine that has all of its NICs bridged? If it is, how?

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• Configure server on network to analyze traffic

  - by Strajan Sebastian

  I have the following network: http://i.stack.imgur.com/rapkH.jpg I want to send all the traffic from the devices that connect to the 192.168.0.1 router to the 192.168.10.1 router(and eventually to the Internet), by passing through the server and an additional router. Almost 2 days have passed and I can't figure what is wrong. While searching on the Internet for some similar configuration I found some articles that are somehow related to my needs, but the proposed solutions don't seem to work for me. This is a similar article: iptables forwarding between two interface I done the following steps for the configuration process: Set static IP address 192.168.1.90 for the eth0 on the server from the 192.168.1.1 router Set static IP address 192.168.0.90 for the eth1 on the server from the 192.168.0.1 router Forwarded all the traffic from 192.168.0.1 router to the server on eth1 interface witch seems to be working. The router firmware has some option to redirect all the traffic from all the ports to a specified address. Added the following rules on the server(Only the following, there aren't any additional rules): iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE iptables -A FORWARD -i eth1 -o eth0 -m state -–state RELATED,ESTABLISHED -j ACCEPT iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT I also tried changing iptables -A FORWARD -i eth1 -o eth0 -m state -–state RELATED,ESTABLISHED -j ACCEPT into iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT but still is not working. After adding the following to enable the packet forwarding for the server that is running CentOS: echo 1 /proc/sys/net/ipv4/ip_forward sysctl -w net.ipv4.ip_forward = 1 After a server restart and extra an extra check to see that all the configuration from above are still available I tried to see again if I can ping from a computer connected to 192.168.0.1/24 LAN the router from 192.168.1.1 but it didn't worked. The server has tshark(console wireshark) installed and I found that while sending a ping from a computer connected to 192.168.0.1 router to 192.168.1.1 the 192.168.0.90(eth1) receives the ping but it doesn't forward it to the eth0 interface as the rule tells: iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT and don't now why this is happening. Questions: The iptables seem that don't work as I am expecting. Is there a need to add in the NAT table from iptables rules to redirect the traffic to the proper location, or is something else wrong with what I've done? I want to use tshark to view the traffic on the server because I think that is the best at doing this. Do you know something better that tshark to capture the traffic and maybe analyze it?

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• Why can't we reach some (but not all) external web service via VPN connection?

  - by Paul Haldane

  At work (UK university) we use a set of Windows servers running WS2008R2 and RRAS which offer VPN service to students in our accommodation. We do this to associate the network connections with individuals. Before they've connected to the VPN all they can talk to is the stuff thats needed to setup the VPN and a local web site with documentation on how to connect. Medium term we'll probably replace this but it's what we're using at the moment. VPN on the 2008 servers allocates client a private (10.x) address. Access to external sites is through NAT on the campus routers (same as any other directly connected client on a private address). Non-VPN connections aren't seeing this problem. Older servers run WS 2003 and ISA2004. That setup works but has become unreliable under load. Big difference there was that we were allocating non-RFC1918 addresses to the clients (so no NAT required). Behaviour we're seeing is that once connected to the VPN, clients can reach local web sites (that is sites on the campus network) but only some external sites. It seems (but this may be chance) that the sites we can reach are Google ones (including YouTube). We certainly have trouble reaching Microsoft's Office 365 service (which is a pain because that's where mail for most of our students is). One odd bit of behaviour is that clients can fetch (using wget on a Windows 7 client) http://www.oracle.com/ (which gets a 301 redirect) but hangs when asked to fetch http://www.oracle.com/index.html (which is what the first URL redirects to). Access works reliably if we configure clients to use our local web proxies (Squid). My gut tells me that this is likely to be something in the chain dropping replies either based on HTTP inspection or the IP address in the reply. However I'm puzzled about why we're seeing this with the VPN clients. Plan for tomorrow (when I'm back in the office) is to setup a web server on external connection so that we can monitor behaviour at both ends of the conversation (hoping that the problem manifests itself with our test server). Any suggestions for things we should be looking at?

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• Git autocomplete is asking for a password, not sure why

  - by Soldier.moth

  I'm running into an issue with autocomplete using git... I am using ubuntu 12.10 and when I perform the following keystrokes g i t Space Bar Tab I am presented with the error Pseudo-terminal will not be allocated because stdin is not a terminal. and prompted for a password. I am not clear how to go about troubleshooting this error, I have tried uninstalling and reinstalling git to no avail. Screenshot of terminal with error:

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• Why configuring manual IP do not work for me in DHCP?

  - by user58859

  I have broadband connection in my laptop. It's getting the IP by protocol. configuration is : ip : 192.168.1.2 subnet : 255.255.255.0 gateway : 192.168.1.1 Now I am curious, In IPV4 properties when instead of choosing "Obtain an IP address automatically", I choose "Use the following IP address" and configure everything same, why it do not work? Do DHCP do not work when we configure the IP manually? (operating system : windows-7) EDIT : After configuring the ip manually, when I used ipconfig/all , it's showing dhcp enabled : NO. I am not doing it. Why it got disabled automatically? and how to enable it? DHCP Enabled. . . . . . . . . . . : No Autoconfiguration Enabled . . . . : Yes IPv4 Address. . . . . . . . . . . : 192.168.1.2(Preferred) Subnet Mask . . . . . . . . . . . : 255.255.255.0 Default Gateway . . . . . . . . . : 192.168.1.1 NetBIOS over Tcpip. . . . . . . . : Enabled

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• How to configure OpenVPN server to use custom default gateway?

  - by Arenim

  I have a vpn server at address 10.1.0.2 and the server have another ip in it's network -- 10.0.0.2 in his subnet (it's a tun2socks router). But default server's gateway is NOT 10.0.0.2 (and it's ok) but another external IP. I want all the client's traffic to be forwarded through this ip address -- 10.0.0.2. Here is part of my server's config: dev tap0 server-bridge 10.1.0.1 255.255.255.0 10.1.0.50 10.1.0.100 push "route 10.0.0.0 255.255.255.0" ; now client can ping 10.0.0.2 push "redirect-gateway def1 bypass-dhcp" push "dhcp-option DNS 10.1.0.1" push "dhcp-option WINS 10.1.0.1" in fact i want some like push "redirect-gateway 10.0.0.2" How can I achieve this?

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• xenserver: xe command never returns?

  - by ethrbunny

  I'm trying to port a xen server 6.2 pool to a new IP address range. I've got three servers total: 2 currently at their new IP but no longer in the pool and one remaining. I'm trying to set IP address information on the two disconnected ones using the xe command and all of its variants. Oddly enough, it never returns with any values. xe host-list It just sits there until I ctrl-c it. The server is still awake and responding though. I can enter other commands (EG ifconfig) and they work fine. If I enter this same command on the remaining server in the pool it works ok. I've tried restarting the toolstack and even rebooting. No change. What am I doing wrong?

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• Fix folder scrolling problem in navigation pane of Explorer

  - by Marko Apfel

  Since my first steps with Win7 I hate the behavior of Explorer to scroll down the current expanded folder in the navigation pane. Today I found a solution in this thread: Bug: Windows Explorer expands folders inappropriately, jumping the folder you expand to the bottom of the navigation pane Download and install Classic Shell Activate the classic explorer bar and choose options Verify that “Fix folder scrolling” is checked Verify fixed behavior If necessary deinstall Classic Shell – the fix is persisted

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• Cant connect to home server

  - by user52141

  Trying to figure out what I might be doing wrong. I installed XAMPP - and everything looks fine. If I go to localhost everything comes right up. But when I go to my IP address, I just get a message that the browser could not connect to it. I go into my router and set up port forwarding for port 80 etc, and I even tried putting the server as a DMZ - still nothing. I turned the firewall off to see if that was interfering in some way, then uninstalled it completely for good measure, made no difference. I'm out of ideas.. oh, and yes I have a static IP address.

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• How to add network printer remotely without knowing the IP?

  - by Steve

  Assume your friend from over 100km away asked you to add a network printer to his computer since you're so tech savvy. How would you add network printer remotely in this case? You would need: 0. Remote connection to your friend's computer 1. Printer IP and brand/model names 2. Respective drivers downloaded either from manufacturer's website or Windows Update driver Question is, how would you find out the IP address of the printer without bothering your friend too much with technical steps? Since your friend isn't as tech savvy as you - they wouldn't know which buttons to press to get IP address.

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• Postgres Remote Access

  - by boot-baby-boot

  I am trying to connect to postgres remotely.I have followed this tutorial http://www.cyberciti.biz/faq/howto-fedora-linux-install-postgresql-server/ and have executed the following commands to see if the remote access is possible. [root@printmyworld ~]# egrep -i "(listen_addresses|port|tcpip_socket).*=.+" /var /lib/pgsql/data/postgresql.conf #listen_addresses = '*' # what IP address(es) to listen on; #port = 5432 [root@printmyworld ~]# lsof +c0 -anPiTCP -upostgres COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME postmaster 9323 postgres 3u IPv4 2875987353 TCP 127.0.0.1:5432 (LISTEN ) postmaster 9323 postgres 4u IPv6 2875987354 TCP [::1]:5432 (LISTEN) I am suspicious of this line: postmaster 9323 postgres 3u IPv4 2875987353 TCP 127.0.0.1:5432 (LISTEN My server ip address is 1yy.000.1xx.000 .Should it be 1yy.000.1xx.000:5432

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• ASUS WL-500gP v2 network between two local machines

  - by Epsiloncool

  I have two windows XP machines in my home networks, connected with ASUS WL-500gp V2 which also used as internet router. Problem is: while I have both computers normally goes to internet (used DHCP, static routes is ON, routing table is empty, operation mode is Home Gateway). I see both computers listed on the Network Neighborhood on 1st computer (wired to router), can enter to my own computer, but can not enter to other. I see only one computer (2nd) on the Network Neighborhood on 2nd computer (connected thru Wi-Fi), can enter to itself, getting error when trying to enter 1st computer address in address line (like \My1stComp). What is the problem? I totally crazy founding problem about 3 months.

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