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• Iptables based router inside KVM virtual machine

  - by Anton

  I have KVM virtual machine (CentOS 6.2 x64), it has 2 NIC: eth0 - real external IP 1.2.3.4 (simplified example instead of real one) eth1 - local internal IP 172.16.0.1 Now I'm trying to make port mapping 1.2.3.4:80 = 172.16.0.2:80 Current iptables rules: # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *nat :OUTPUT ACCEPT [0:0] :PREROUTING ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A POSTROUTING -o eth0 -j MASQUERADE -A PREROUTING -p tcp -m tcp -d 1.2.3.4 --dport 80 -j DNAT --to-destination 172.16.0.2:80 COMMIT # Completed on Fri Jun 29 17:53:36 2012 # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *mangle :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT # Completed on Fri Jun 29 17:53:36 2012 # Generated by iptables-save v1.4.7 on Fri Jun 29 17:53:36 2012 *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] COMMIT # Completed on Fri Jun 29 17:53:36 2012 But there is nothing works, I mean it does not forwards that port. Similar configuration without virtualization seems to be working. What am I missing? Thanks!

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• SSH broken, segfault error 4

  - by trampi

  i cannot connect to my server via ssh, it throws me a "server unexpectedly closed connection" after entering the password. in var/log/messages the only noteable message is: Apr 14 17:41:23 s15410270 kernel: sshd[3602]: segfault at c0 ip 7f0801acbdb0 sp 7fff0adff860 error 4 in libc-2.8.so[7f0801a87000+14f000] Apr 14 17:41:29 s15410270 kernel: sshd[3606]: segfault at c0 ip 7f75f9463db0 sp 7fff027971f0 error 4 in libc-2.8.so[7f75f941f000+14f000] This message appears after a log in attempt via ssh or via sftp Its a SuSE Linux server. I'm looking for help where to start to search for the error, i can still act as root via a serial console. edit: "server unexpectedly closed connection" only appears if i enter the correct password!

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• IBM storage ds3400 Cant connect to management using fiber

  - by Eli B

  i have a problem with a DS3400 IBM storage system we bought a few years back. when i try to manage the storage using its IBM storage management i cant find it using automatic detection even though its connected directly using the fiber and i can see the Logical drives connected and working properly. when i tried to connect the two management Ethernet wires and manage the storage directly by entering the IP address manually i am able to connect however after i make several changes to the controller configuration one of the controllers stops responding and i am not able to ping it directly (since you cant make any changes without being connected to both controllers this is a problem) whats more bizarre is that when i change the IP of the controller that doesn't respond it starts working .. i have found some articles over the web explaining stuff about LUN31 being missing and causing similar problems however all my attempts to manually configure it failed . *link to an example http://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-5075711 in short im trying to get my storage to appear in the storage manager when directly connected using only the fiber cable directly attached. thanks in advance

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• Multicast in private LAN with different subnets

  - by Gobliins

  after i read Multicast IP Addresses and Multicast accross the subnets I am confused. Configuration: I have two devices in the same network. They may not be in the same Subnet, but always in the same physical network (beyond the same router, switch etc.) I want to communicate across IP multicast either 224.x.x.x or 239.x.x.x may be more fitting because we want it local, not beyond of forward through the router. Can one machine be the receiver and the other machine sender of the same multicast address? and can the receiving machine send an answer to the sending machine?

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• Sharing Internet Connection in Windows 7 is so much more frustrated than Windows XP

  - by Phuong Nguyen

  Back to the time of Windows XP, from Properties dialog of my Wireless Connection, I can enable sharing and then select LAN network from the Drop Down List and boom, I can share it with my friend. We just need a LAN cable (either cross or not-cross is OK) and his Laptop will get an auto IP to gain access to internet. But now with the new Windows 7, everything starts to suck. I cannot see the Drop Down List any more in the sharing panel and my friends Laptop cannot get an automatic IP anymore. Am I doing anything wrong over there? How can I gain back the peace I used to have with Windows XP?

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• cannot connect to MS FTP 7.5 on Windows 2008 on Amazon EC2 instance

  - by minerj

  I have just installed the MS FTP 7.5 upgrade on my Windows 2008 Server (Service Pack 2) running on an Amazon EC2 instance. In the FTP Firewall Support settings for the server in IIS Manager I have set up the passive port range 45001 - 45005 and also set the External Firewall IP address to match the assigned Amazon Elastic IP address. Using the AWS Console I changed the Security Group for the server to allow access to the server through ports 21 and 45001 through 45005. Using an FTP client (either the command line FTP client or Windows Explorer) on the Amazon server I can connect to the FTP server but I cannot connect with an external FTP client. When I checked to see which ports were open on the server using Shields Up it shows that port 21 is open but ports 45001 to 45005 are closed. I assume I'm missing something. Any help greatly appreciated.

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• UAE and the mysteries of unreachable websites

  - by 0plus1

  I write here because I'm really lost, please stay with me because it's not easy to explain. A company asked me to set-up a private server, now I'm a programmer so I got a solution with technical support and cpanel which helped me to setup everything and it's working smoothless. I'm by no means a professional sysadmin, but I have a fair knowledge of server configurations, but this problem is way over my knowledge, and apparently way over the knowledge of most sysadmins, I really hope that here I'll find someone with enough experience to help me or at least give me more insight. Now this company for which I'm consulting operates in the UAE (United Arab Emirates) and from there the server is almost unreachable. It started with ns not registering in the UAE, after a week that sorted itself out and now the site is indeed reachable, but it takes almost 2 minutes to load a webpage with one line of text. Emails go in timeout. The domain currently parked there has been bought appositely for tests, the main one that was supposed to go there, after a catastrophic week has been transferred to a shared hosting solution in the UK, and from there it works like a charme. Now after doing some research I discovered that I'm not alone in this, there are several reports of webmasters discovering that their website is not reachable inside the UAE, and mind this has nothing to do with the state-wide block of questionable sites, because in that case an error message appears, this seems to be related to the infrastructure of the UAE, which apparently reroutes everything through their own "fake" internet. Apparently new servers with their own IP are not recognized (yet?) by the UAE infrastructure, while shared hosting solutions seeing that they operates tons of other websites are more likely to be part of the UAE network. Now my questions are: 1) Has someone a real explanation for this? The only thing I can think of is that the server is on a new IP that is not yet recognized by the UAE, but that doesn't explain why it loads (even if after 2 minutes). I don't have any help from within the UAE as the only people that are "experts" are questionable companies that simply try to sell their own services. 2) If there is really some kind of block of new servers, is it possible to know before if a server is reachable from within the UAE, currently this is not a ns problem as even accessing the server with its IP result in a 2 minute wait. 3) Can it be that the problem lies somewhere else? There are some tests that I can perform? I'm not physically in the UAE, but I can ask the people there, or use teamviewer. Could it be some misconfiguration on the server (mind that the site works EVERYWHERE else in the world). Thank you for ANY kind of help

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• Does RDNS for mail server have to match the mail server hostname exactly?

  - by threecheeseopera

  Typically when setting up a mail server, I create an rDNS record for the mail server IP to match the mail server hostname (ex: mail.example.com). Can I instead set the rDNS ptr to match the parent domain (e.g. example.com), if this server is being used for multiple purposes, and still send mail successfully (i.e. not be classified as spam b/c of mismatched rDNS)? Thanks! EDIT: The article at http://en.wikipedia.org/wiki/Forward_Confirmed_reverse_DNS seems to indicate that it might be more complicated than I had thought. For instance, 1) I did not know that you could have multiple PTR records for a given IP; 2) it appears that as long as each PTR record matches an A record, everything is good (basically nullifying my question). Would you agree?

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• How do you set up DNS in Window Server 2008 in a Hyper-V environment?

  - by Nathan DeWitt

  I have a laptop running Server 2008 and Hyper-V. I have created a virtual machine that is also running Server 2008, that I used dcpromo to create as a domain controller. I disabled IPv6 because I had no idea how to enter a default address, and I just wanted to make a standalone MOSS dev environment. I have tried every combination of creating a virtual network on the host and then connecting to that in the VM, but I can't get the VM to communicate with the host and vice versa. No pinging, no copy and paste, nothing. Thanks. To update: My VM (which is its own DC) currently does not have a static IP. When I set the IP to static, I could not find anything that would let it talk to the host machine.

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• MBP Bluetooth PAN connection with iPhone 4

  - by Chetan Sachdev

  I am trying to share MBP(OSX 10.8.3) internet connection with iPhone 4 (iOS 6) using Bluetooth PAN(Personal Area Network). Problem is Bluetooth PAN is not getting an ip address. I have tried to renew DHCP lease but nothing works. When I give a Manual IP address, the Bluetooth PAN goes green but doesn't shows the connection in iPhone. Is it possible to share the internet connection via Bluetooth. Note: I don't want to create an Ad-hoc connection over wifi.

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• How to Use 3 Monitors

  - by The.Anti.9

  Right now my setup has a nice big 24" flatscreen in the center, and a 19" flatscreen to the left. And a big gaping hole on the right. I have a 3rd monitor to put there, but I'm not sure how to get the computer to recognize it. Do I need a graphics card with 3 ports? Or can I span the monitors over non SLI-Linked graphics cards? Is it possible to plug my 3rd monitor into the on-board VGA port and have it work?

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• What is IPKVM and why would I need that to install SQL Server on my Web Server?

  - by Eric

  Hello. I have a dedicated server, and will be installing SQL Server. However, my hosting company said they can connect an external CD ROM drive and give me KVM over IP to install SQL Server. My question is, what is IPKVM, and how does it work? Do I need special hardware or software on my side to use it....or do I just connect via remote desktop? Also, why can't I remote into my server through remote desktop instead of using KVM over IP?

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• Traffic shaping & monthly traffic limit in Tomato?

  - by Matt H

  Is there a way to do a monthly traffic limit in Tomato, DDWRT or OpenWRT in addition to the regular QoS? This is for a house with several students sharing the internet. I.e. for a specific IP address, IP Range or MAC address, the firmware will count the download traffic for that month. When a configurable limit is set, it'll either limit it to say 64kbit/s up/down or drop all traffic and maybe redirect web traffic to an internal web server telling them that they have exceeded their quota. How can this be done with those firmwares?

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• Sharing Internet Connection in Windows 7 is so much more frustrated than Windows XP

  - by Phuong Nguyen

  Back to the time of Windows XP, from Properties dialog of my Wireless Connection, I can enable sharing and then select LAN network from the Drop Down List and boom, I can share it with my friend. We just need a LAN cable (either cross or not-cross is OK) and his Laptop will get an auto IP to gain access to internet. But now with the new Windows 7, everything starts to suck. I cannot see the Drop Down List any more in the sharing panel and my friends Laptop cannot get an automatic IP anymore. Am I doing anything wrong over there? How can I gain back the peace I used to have with Windows XP?

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• Can a slow internet-connection corrupt a file?

  - by Tony

  When downloading a big file, can a slow internet connection cause it to corrupt?

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• faking NAT with a VMware distributed switch across multiple hosts

  - by romant

  I need to construct a NAT for certain machines within the network. Wish to do this with dvSwitch - as it seems the logical way of attacking the problem as in this scenario there's just under 30 hosts. In order for the NAT'ed VM's to have access to the 'real' network. I am providing a 'router' VM, which will have access to the WAN/outside network, and also act as the DHCP server for the NAT'ed machines. Problem Space When the machines connected to the NAT interface and the router are on the same host, then they get an IP from the router VM, and work perfectly (routed outside). Unfortunately machines on other Hosts that are connected to the dvSwitch do not get an IP and further tcpdump shows no network data getting through across the hosts within the dvSwitch. Has anyone achieved a NAT solution using a dvSwitch before that they could share?! Thank you. EDIT: Including the diagram.

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• How to set up memcached to use unix socket?

  - by alfish

  While I could use memcached on Debian to use the default 11211 port, but I've had great difficulty setting up unix socket, Form what I'v read, I know that I need to create a memcache.socket and add -s /path/to/memcache.socket -a 0766 To /etc/memcached.conf and comment out the default connection port and IP, i.e. -p 11211 -l 127.0.0.1 However, when I restart memcached I get internal server errors on Drupal site. I'm trying to implement unix sockets to avoid TCP/IP overhead and boost overal memcached performance, however not sure how much performance gain one can expect of this tweak. I appreciate your hints or possibly configs to to resolve this.

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• VPN Connected, How to browse files? Windows Vista

  - by Wbdvlpr

  I am trying to establish a VPN connection to a server in my office from my laptop at home. I tried some of the steps as mentioned here: Connect to a network Connect to a workplace Use my Internet Connection (VPN) Then type server IP address and then my username & password. After creating a VPN connection, I can see I am connected to it. Now I want to browse files on the server. But I have no clue where I should look for them. I was thinking more of a simple step, like, Windows Run > Type ip address > \\124.345.678.900, then a prompt asking username and password, and finally a window opens to view the files. I tried to google it, but still unable to view files. Please help. Update: I didn't mention that when I try to connect to server via \\124.345.678.900 I get 0x80070043 error message.

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• How is the MTU is 65535 in UDP but ethernet does not allow frame size more than 1500 bytes

  - by nikku

  I am using a fast ethernet of 100 Mbps, whose frame size is less than 1500 bytes (1472 bytes for payload as per my textbook). In that, I was able to send and receive a UDP packet of message size 65507 bytes, which means the packet size was 65507 + 20 (IP Header) + 8 (UDP Header) = 65535. If the frame's payload size itself is maximum of 1472 bytes (as per my textbook), how can the packet size of IP be greater than that which here is 65535? I used sender code as char buffer[100000]; for (int i = 1; i < 100000; i++) { int len = send (socket_id, buffer, i); printf("%d\n", len); } Receiver code as while (len = recv (socket_id, buffer, 100000)) { printf("%d\n". len); } I observed that send returns -1 on i > 65507 and recv prints or receives a packet of maximum of length 65507.

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• How to configure Amazon Security Groups to achieve multi-tier architecture?

  - by ks78

  What is the preferred way to configure Amazon Security Groups to achieve a multi-tier architecture? Each of my instances has its own Security Group, which I only want to use for rules specific to an instance. I'd like to keep any rules which apply to multiple instances in a separate Security Group, which can then be assigned to instance Security Groups as necessary. As an example, I've setup a group called "admin", which allows administrative access from my IP. I added the "admin" group as the source to each of my instance security groups. However, I still can't access the instances from my IP without adding the rules directly to the instance's group. Am I missing something? Although it seems a multi-tier security architecture should be possible, it doesn't seem to be working.

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• Using mod_rewrite to shutdown website.

  - by moolagain

  Hi, I am trying to shutdown a website to everyone except my ip address. I almost have it working. I cannot access www.mysite.com, but I can access all folders that have another .htaccess file in them. I have a .htaccess file in /www with the following code: #Use this when website is down RewriteEngine on #this allows access through my ip RewriteCond %{REMOTE_ADDR} !^(66\.777\.888\.99)$ RewriteRule !down.php$ /down.php [L] Some folders in my site have .htaccess files in them. If I have a file with the line: RewriteEngine on I can still access the folder. For example, if I have the second .htaccess file in /www/about, then I can still access mysite.com/about (but the .css file included on that page actually loads down.php). If I delete "RewriteEngine on" I get redirected to down.php. Any ideas? I think my mod_rewrite gets confused with multiple .htaccess files. Thanks!

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• When connected through a router, a new gateway appears, and I lose my internet connection.

  - by idan315

  I have two computers connected to a router, connected to my ADSL modem by PPPoE. One of those computrs use Windows XP, the other uses Windows 7. The computer using Windows 7 keeps getting limited or no connectivity, and I can't use it to connect to the internet. Connecting the computer to the modem without the router 'in the way' worked, and I was able to use the internet - which led me to believe that the problem is with my router. However, I have changed my router, and the problem persists. (Just to be clear: the computer using Windows XP can connect to the internet without any problem). This entire question is about the PC using Windows 7. The only symptom of this problem is that when I see my network devices, in addition to my router (which appears as "Network 4", or something of the sort), I also see an "Unidentified Network". When using ipconfig to check the problem, I see a second gateway, with the IP 0.0.0.0, in addition to the IP of my router.

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• How can I have 2 users working on the same PC at the same time

  - by Sharon Cook

  I have a pc/machine that has its own ip address and it can be connected to by certain external PC's through our firewall. User A has a RDP connection from say Germany directly to the PC - his ip number is allowed through our firewall to connect to the PC. He now wants User B to connect at the same time so that User B can see what User A is doing on the screen at the same time and maybe take over the screen to put his input in. I know that you cannot have 2 RDP connections at the same time but what would be the easiest solution to this. I want User A to keep his RDP connection, but I am unsure of what to suggest so that User B can see what is going on at the same time. The Users are not happy to use Real VNC, etc.

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• How come I can't ping my home computer?

  - by bikefixxer

  I'm trying to set up a vpn into my home computer in order to access files from wherever. I have the home computer set up with a no-ip dynamic dns program so I can always connect, and have also tried using the actual ip address. However, when I try to connect or even ping from anywhere outside of my house I can't get through. I've tried putting that particular computer in the dmz, turned off the computers firewall and anti-virus, and I still don't get anything. I have comcast as my home internet provider. I have also tried from two different locations. Are there any other solutions I can try or is comcast the issue? I used to be able to do this when I ran a small web server at home for fun but now nothing works. Thanks in advance for any suggestions!

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• forwardfor information is missing

  - by FAFA

  I use following configuration to load balance https connections, using haproxy 1.4.8. SSL offloading is done by apache. listen ssl_to_waf 192.168.101.54:443 mode tcp balance roundrobin option ssl-hello-chk server wafA 192.168.101.61:444 check listen ssl_from_waf 192.168.101.61:445 balance roundrobin option forwardfor server webA 192.168.101.46:80 check For HTTP requests this works great, requests are distributed to my Apache servers just fine. But for HTTPS request, I lose the "forwardfor" information. I need to save the client IP address. How can I use HAproxy to load balance across a number of SSL servers, allowing those servers to know the client's IP address?

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