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• Server 2012r2 VPN DNS

  - by Tyron Gower

  Have an issue where onsite clients cannot resolve VPNusers. but VPN users can resolve onsite machines. example. USER! uses LAPTOP1 USER1 connects to VPN gets internal IP address of 10.243.0.200 USER1 pings SERVER1 - resolve to ip and gets reply USER1 RDP into SERVER1 (inside VPN) USER1 pings LAPTOP1 from SERVER1 resolves to ip address last assigned by DHCP (10.243.0.139) ping fails USER1 pings 10.243.0.200 from SERVER1 gets reply. Running Server 2012r2 It is a domain controller, DNS and VPN server. VPN is just configured with basic default settings. All VPN users have static IP setup in AD. Not sure where to go from here.

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• Windows 2008 - Define IP Order by port or service

  - by Josh

  I have a Windows 2008 server that has three IP bound to the NIC. I can select which IP Windows SMTP listens to, but I want to also set the IP address used when mail is sent. Where would I set which outbound IP to use when sending email? Without using real IPs, here is an example what I have setup. Three IPs associated with the server: 10.0.0.1 10.0.0.2 10.0.0.3 I setup the binding on 10.0.0.2 for port 25 in the SMTP server settings, so that it is the only IP that will respond for inbound. When I look at the email header from an email sent from that server, it lists the server with an address of 10.0.0.3. I would like it to use 10.0.0.2 so that when reverse DNS is performed, it maps back correctly.

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• VirtualBox sous Linux, un tutoriel pour apprendre à utiliser le logiciel de virtualisation

  Bonjour,Je vous présente un tutoriel sur l'utilisation de virtual box sous linux : Citation: VirtualBox est un logiciel de virtualisation de systèmes d'exploitation. En utilisant les ressources matérielles de l'ordinateur (système hôte), VirtualBox permet la création d'un ou de plusieurs ordinateurs virtuels dans lesquels s'installent d'autres systèmes d'exploitation (systèmes invités).Les systèmes invités fonctionnent en même temps que le système hôte, mais seul ce dernier a accès directement...

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• Which Login Manager is this?

  - by Z9iT

  May someone tell me the name of this Login manager ? Additionally I would like to know : How the background image has been added? How to install this (with the apt-get command) ? Will this work with cinnamon DE ? Is it resource intensive ? How much RAM and disk space it eats up ? Note : Cinnamon is the only DE I am currently having, which has been installed upon ubuntu minimal having LAMP stack.

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• Emails going into junk and spf records

  - by user346443

  Hi, our emails are being flagged as junk. I have two different webistes both with their own dedicted ip address. sitea.com = xx.xx.xx.43 siteb.com = xx.xx.xx.44 Im using hmailserver to host our emails and have the smtp bound to the ip address of xx.xx.xx.42 im aware that i can set up a spf record to state that the what servers emails can be sent from v=spf1 mx ip4:xx.xx.xx.43 mx:mail.sitea.com ip4:xx.xx.xx.42 -all Would the fact that email are not sent from the sites ip's be causing them to be flagged as junk. Cheers Cam

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• Squid throws error, The requested URL could not be retrieved

  - by Supratik

  Hi Sometimes I am getting the following error The requested URL could not be retrieved While trying to retrieve the URL: http://groups.google.com/ The following error was encountered: Unable to determine IP address from host name for groups.google.com The dnsserver returned: Refused: The name server refuses to perform the specified operation. This means that: The cache was not able to resolve the hostname presented in the URL. Check if the address is correct. Your cache administrator is root. What could be the reason for the above error ? Regards Supratik

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• IOS not saving evaluate rule in access-list

  - by DeeJay1

  Hi. I have a basic firewall set up on an pretty od IOS in form of IPv6 access list exterior-in6 evaluate exterior-reflect sequence 1 permit ipv6 any host [my external address] sequence 10 permit tcp any host [my internal address] eq 22 sequence 11 permit icmp any any sequence 800 permit udp any any range 6881 6889 sequence 900 permit tcp any any range 6881 6889 sequence 901 deny ipv6 any any sequence 1000 IPv6 access list exterior-out6 permit ipv6 [my internal subnet] any reflect exterior-reflect sequence 10 Unfortunately the evaluate exterior-reflect sequence 1 line seems to get lost after each reboot, leaving my internal network without access. Any ideas?

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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 Unique and Quality Content?

  Its rightly said in the search engine optimization block that "Content Is King." This term is coined a hell of a lot number of times in the virtual world, then you can count. Let us have a look why is it so?

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• How to draw a spotlight in 3D

  - by RecursiveCall

  To be clear, I am not talking about the light result (the lit area) but the spotlight itself, like this The two common suggestions that I tried are 2D image and a 3D cone. The problem with the pre-regenerated 2D image is that it always look 2D and flat no matter how it is rotated in world space. The cone on the other hand is next to impossible to control when it comes to fade distance, it doesn't look soft (smooth) and it is expensive to compute.

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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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• 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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• WAMP - phpmyadmin 403 error from localhost, but not from IP 127.0.0.1?

  - by kdub

  I was wondering if anyone can explain this to me. I installed WAMP 2.2. I opened up the dashboard menu, and clicked localhost. I was brought to the WAMP localhost home page. I clicked on phpmyadmin and get a 403 access is denied error message. However, if I type in the ip address 127.0.0.1/phpmyadmin in the address bar, then VOILA, I am in (however, I am not prompted to login to phpmyadmin, I am instantly brought to the phpmyadmin homepage) Please note, I have found the solution to get rid of the 403 error message when entering phpmyadmin from the the localhost extension (change the Deny all setting to Allow all); so I am not asking how to solve that, but my question is: Why if localhost and 127.0.0.1 go to the same spot, will when using the IP addres, I am granted access to subsequent applications and with localhost I am not? Any feedback would be greatly appreciated.

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• Shouldn't tasksel be installed by default?

  - by Neil Trodden

  It just isn't there on the base install of a virtual host I am evaluating from an ISP. Not in path: root@vpstest2:~# tasksel -bash: tasksel: command not found Config files not there: root@vpstest2:~# ls /usr/share/tas* ls: cannot access /usr/share/tas*: No such file or directory It's just .... gone! root@vpstest2:~# whereis tasksel tasksel: I'm a little concerned that the install is broken. Running locate spews this out: locate: can not stat () `/var/lib/mlocate/mlocate.db': No such file or directory

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• LinuxCon Brazil 2010

  <b>Linux Foundation:</b> "The Linux Foundation is pleased to announce the launch of LinuxCon Brazil taking place this fall in SãPaulo. LinuxCon is already the premiere Linux conference in both North America and Asia, providing an unmatched collaboration and education space for all matters Linux, and we are pleased to be able to extend this event into South America."

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• Ubuntu 11.04 Static IP doesn't take

  - by mrduclaw

  I'm trying to set a static IP address in Ubuntu 11.04. I did a server install. I edited my /etc/network/interfaces file to include: auto eth0 iface eth0 inet static address 10.0.0.100 netmask 255.255.255.0 gateway 10.0.0.1 When I do a /etc/init.d/networking restart this appears to take. After awhile though, that 10.0.0.100 will turn into something dished out by the DHCP server. My problem appears to be similar to this: Ubuntu intrepid - static IP networking keeps restarting with DHCP But I don't have Gnome installed. Is there anything else that's running in the background that could be doing this? And if so, how do I disable it?

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• Application stuck in TCP retransmit

  - by SandeepJ

  I am running Linux kernel 3.13 (Ubuntu 14.04) on two Virtual Machines each of which operates inside two different servers running ESXi 5.1. There is a zeromq client-server application running between the two VMs. After running for about 10-30 minutes, this application consistently hangs due to inability to retransmit a lost packet. When I run the same setup over Ubuntu 12.04 (Linux 3.11), the application never fails If you notice below, "ss" (socket statistics) shows 1 packet lost, sk_wmem_queued of 14110 (i.e. w14110) and a high rto (120000). State Recv-Q Send-Q Local Address:Port Peer Address:Port ESTAB 0 12350 192.168.2.122:41808 192.168.2.172:55550 timer:(on,16sec,10) uid:1000 ino:35042 sk:ffff880035bcb100 <- skmem:(r0,rb648720,t0,tb1164800,f2274,w14110,o0,bl0) ts sack cubic wscale:7,7 rto:120000 rtt:7.5/3 ato:40 mss:8948 cwnd:1 ssthresh:21 send 9.5Mbps unacked:1 retrans:1/10 lost:1 rcv_rtt:1476 rcv_space:37621 Since this has happened so consistently, I was able to capture the TCP log in wireshark. I found that the packet which is lost does get retransmitted and even acknowledged by the TCP in the other OS (the sequence number is seen in the ACK), but the sender doesn't seem to understand this ACK and continues retransmitting. MTU is 9000 on both virtual machines and througout the route. The packets being sent are large in size. As I said earlier, this does not happen on Ubuntu 12.04 (kernel 3.11). So I did a diff on the TCP config options (seen via "sysctl -a |grep tcp ") between 14.04 and 12.04 and found the following differences. I also noticed that net.ipv4.tcp_mtu_probing=0 in both configurations. Left side is 3.11, right side is 3.13 <<net.ipv4.tcp_abc = 0 <<net.ipv4.tcp_cookie_size = 0 <<net.ipv4.tcp_dma_copybreak = 4096 14c11 << net.ipv4.tcp_early_retrans = 2 --- >> net.ipv4.tcp_early_retrans = 3 17c14 << net.ipv4.tcp_fastopen = 0 >> net.ipv4.tcp_fastopen = 1 20d16 << net.ipv4.tcp_frto_response = 0 26,27c22 << net.ipv4.tcp_max_orphans = 16384 << net.ipv4.tcp_max_ssthresh = 0 >> net.ipv4.tcp_max_orphans = 4096 29,30c24,25 << net.ipv4.tcp_max_tw_buckets = 16384 << net.ipv4.tcp_mem = 94377 125837 188754 >> net.ipv4.tcp_max_tw_buckets = 4096 >> net.ipv4.tcp_mem = 23352 31138 46704 34a30 >> net.ipv4.tcp_notsent_lowat = -1 My question to the networking experts on this forum : Are there any other debugging tools or options I can install/enable to dig further into why this TCP retransmit failure is occurring so consistently ? Are there any configuration changes which might account for this weird behaviour.

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• What OO Design to use ( is there a Design Pattern )?

  - by Blundell

  I have two objects that represent a 'Bar/Club' ( a place where you drink/socialise). In one scenario I need the bar name, address, distance, slogon In another scenario I need the bar name, address, website url, logo So I've got two objects representing the same thing but with different fields. I like to use immutable objects, so all the fields are set from the constructor. One option is to have two constructors and null the other fields i.e: class Bar { private final String name; private final Distance distance; private final Url url; public Bar(String name, Distance distance){ this.name = name; this.distance = distance; this.url = null; } public Bar(String name, Url url){ this.name = name; this.distance = null; this.url = url; } // getters } I don't like this as you would have to null check when you use the getters In my real example the first scenario has 3 fields and the second scenario has about 10, so it would be a real pain having two constructors, the amount of fields I would have to declare null and then when the object are in use you wouldn't know which Bar you where using and so what fields would be null and what wouldn't. What other options do I have? Two classes called BarPreview and Bar? Some type of inheritance / interface? Something else that is awesome?

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• Two routers in a LAN

  - by taxi

  router A no wifi +--- pc01 +--- pc02 | +--- router B wifi +--- pc03 +--- printer In my LAN I have a modem-router (say A) (no wifi connection) acting as DHCP server, and connected to the Internet. Now, I want to add another router (say B) (with wifi connection) to the LAN, in order to connect wifi pc's and net printers. Here I would disable DCHP server functionality. Is it correct to connect router B to router A via an ethernet port? In router A I define an IP address (eg 192.168.1.100) to be assigned to router B (MAC address). I expect to see router B listed as an attached device, in router A's status, but on the contrary it is not listed.

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• Setting up a copy of a site with IIS 7?

  - by SJaguar13

  I have a site running on IIS with a dyndns.org domain that points to the IP of the Windows 2008 machine hosting it. I need a copy of that site for development purposes. I set up another folder with all the files, and create a new site in IIS. I don't really have a domain for it, so I was just going to use the IP address. When I go to localhost, 127.0.0.1, or the internal IP, I get bad hostname. If I use the IP address on port 80 (the same as the real version of the site), I get 404 not found. If I use a different port so I don't have them both on the same IP with the same port, I get connection timed out. How do I go about setting this up?

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• Can't connect to service on ubuntu?

  - by user36914

  I have a service i just installed on a ubuntu workstation machine. Say its running under port 511. I can connect locally : telnet localhost 511 When i try to connect from a remote machine it fails telnet 192.168.0.1 511 Whats wierd is i tried to connect locally using the ip address and i get the following error: "Unable to connect to remote host: Connection Refused" I checked the status of the firewall: sudo ufw status and get back "status:inactive" So does anyone know why i can't connect remotely since the firewall is disabled and why can't i connect locally using its ip address. I don't know if this matters but its running under esxi.

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• Create and redirect subdomain for a parked domain?

  - by Steve

  I have a domain parked.com which is parked onto real.com. I have created the subdomain m.parked.com by editing parked.com's named file: m 14400 IN A ip-address www.m 14400 IN A ip-address This works somewhat: if I go to m.parked.com it redirects to http://m.parked.com/cgi-sys/defaultwebpage.cgi This is my question: I would like to redirect this subdomain to real.com as that is the domain it is parked on. I do not know how to do this as parked.com does not have its own .htaccess file, etc. (due to it being a parked domain) so I can't do any mod_rewrite magic. Can anyone help me? Thanks EDIT: Clarification

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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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• Does anyone know of a inexpensive NAT router that has the ability to limit access to the Internet to

  - by Corey

  Does anyone know of a inexpensive NAT router that has the ability to limit access to the Internet to a specific MAC address? I know the Linksys routers have a MAC filtering feature, but it is the opposite of what I need. It allows you to block access to a specific MAC address. I need something that will block all, but allow an exception. I'm dealing with some VOIP issues in my company's network, and I think the answer is to have a separate router on the network for my PBX to use. I want to make sure that other nodes are not allowed to access the Internet via this second router.

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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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