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• How to redirect / route VPN traffic to back standing local network?

  - by Milkywayfarer

  There are two computers one "HOME" with Ubuntu 10.10 installed, and another "WORK" with WinXP installed. WORK PC is behind draconian firewall. However, let's imagine, that there is VPN connection installed between this 2 work stations, for example, with teamviewer, hamachi, openvpn, or by some other mean (by the way, what is the best mean for such purposes?). One is interested in working with WORK's LAN resources from his HOME computer via VPN. So my question is about configuration required to be done on WinXP machine (or, maybe on both machines), to make such interaction possible? I'm guessing that some routing stuff should be performed somewhere. But I don't know what exactly and how to do?

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• Iptables working strangely

  - by user109985

  I have Ubuntu 12.04 x64 installed in my laptop. I'm quite new to linux, and I wanted to specify certain rules for the iptables firewall. This is the saved config of my iptables: *mangle :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] COMMIT *nat :PREROUTING ACCEPT [0:0] :INPUT ACCEPT [0:0] :OUTPUT ACCEPT [0:0] :POSTROUTING ACCEPT [0:0] -A PREROUTING -p tcp -m tcp --dport 3306 -j DNAT --to-destination 192.168.1.100:3306 -A PREROUTING -p tcp -m tcp --dport 11002 -j DNAT --to-destination 192.168.1.100:11002 -A PREROUTING -p tcp -m tcp --dport 13000 -j DNAT --to-destination 192.168.1.100:13000 -A PREROUTING -p tcp -m tcp --dport 13001 -j DNAT --to-destination 192.168.1.100:13001 -A PREROUTING -p tcp -m tcp --dport 13002 -j DNAT --to-destination 192.168.1.100:13002 -A PREROUTING -p tcp -m tcp --dport 13003 -j DNAT --to-destination 192.168.1.100:13003 -A PREROUTING -p tcp -m tcp --dport 13004 -j DNAT --to-destination 192.168.1.100:13004 -A PREROUTING -p tcp -m tcp --dport 13061 -j DNAT --to-destination 192.168.1.100:13061 -A PREROUTING -p tcp -m tcp --dport 13099 -j DNAT --to-destination 192.168.1.100:13099 -A POSTROUTING -j MASQUERADE COMMIT *filter :INPUT DROP [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -i eth0 -p tcp -m tcp --dport 3306 -j ACCEPT -A INPUT -i eth0 -p tcp -m tcp --dport 80 -j ACCEPT COMMIT In theory, what it does is to drop all connections in all ports except for http, mysql and few other ports. Moreover, it redirects all mysql and 13000-13004..etc port connections to a specific local ip in the same port, which is 192.168.1.100. But what I find strange is that when my firewall is active, it blocks absolutely all the input connections, even those which must not block (http, mysql). In fact, I'm literally blocked and I can't establish any external connection. What am I doing wrong? PS: I tested the firewall without those redirections, and it still block all inputs, so I suppose it's not the problem.

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• TCP handshake ok, then the client isn't receiving any packets from the server

  - by infgeoax

  Topology: Client ----- Intermediate Device ----- Server Client: win7 Intermediate Device: unknown Server: CentOS 5.8 The problem occurs when the client and server are trying to establish a SSL connection. It happens to one specific port, 2000. I haven't been able to replicate the problem with other port numbers. I captured packets on both client and server. After the TCP handshake, from the client's perspective, it's not receiving ACKs for its previously sent packets so it kept re-sending them. On the server side, however, it did receive those packets and sent ACK packets. The weird thing is, after the server sent those ACKs, it received a [RST, ACK] packet, from the intermediate device, for every packet it sent. What could be the cause?

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• Is it possible for a router to "go bad" with time?

  - by JQAn

  I've been having problems with my internet connection over the past weeks (intermittent disconnections, slow transfers, etc), and my provider keeps telling me that the problem is not on their end. I have cablemodem with a wifi router (this router was not provided by them). The router is quite old (DIR-300), so I'm starting to wonder if it could be the issue and if I should replace it. Is it possible that it is the cause? Can they become so outdated that they cause intermittent interruptions of service? If I reset the modem and the router, they work fine for a few hours, but the problems starts again after a while.

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• non-mapped virtual memory & total number of connections

  - by tszming

  We have two MongoDB data nodes (replica set) - Primary & Secondary. I noticed that the non-mapped virtual memory is relatively high and wondering if they are hurting our MongoDB performance (The server usually peaked at around 6-7K queries per sec). In MMS, it was stated: "The most common case of usage of a high amount of memory for non-mapped is that there are very many connections to the database." So we checked the memory usage with db.serverStatus().mem in our Secondary: { "bits" : 64, "resident" : 6846, "virtual" : 416797, "supported" : true, "mapped" : 205549, "mappedWithJournal" : 411098, "note" : "virtual minus mapped is large. could indicate a memory leak" } Note: We are using 2.0.4 and now the default stack size should be 1MB per connection. The current number of connections is around 1.1K, but the non-mapped virtual memory (virtual-mappedWithJournal) is around 5699 MB. The trend is quite stable so I can't say there is a leak here, but where is the memory gone? Any idea?

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• How can I redirect HTTP(S) traffic to another gateway?

  - by PsyStyle

  I have a network like 192.168.0.0/15 with the default gateway set to 192.168.0.1. All 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 that I'm 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 keeping untouched 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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• Is there a way for me to test my [closed]

  - by Jimi

  I have a home network with a cheap-o little router with a development server and a few devices hooked up to it. I am finding that backups of my server are taking FOREVER (a week for 60gb) running backups renders my internet connection useless from any other box int he house. I have maxed out the pipe to my house from the ISP (10down, 3up), but is there a way for me to test and see if my router is bottlenecking anything? I feel like 60gb backups shouldn't take this long so any help would be great!

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• intermittent SSH with ssh_exchange_identification error

  - by rafamvc

  My ssh connection to my server works every 30 min for around 10 min. Things that I figure out that might be the problem: The server is underload (it is a database server), but on those spare moments that I can connect, it is still under the same load, which doesnt make sense. The server is a ubuntu, and the consolekit was using a lot of virtual memory. Restarted the consolekit and it seems to be using a right amount of memory now. It is not the host alows or deny. Those are setup properly. It is not a firewall problem. Those settings were working and the same settings are working for other similar machines. It is on the ec2. Amazon cloud.

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• ssh on Window Vista and Ubuntu 12.04

  - by Adebayo

  Greeting to all. On my Fijitsu system with intel processor, I could not ssh from my Window Vista partition using PUTTY and also could not ssh from my Ubuntu 12.04 partition. I am try to ssh into a remote machine where I have an account but I always get Connection refused. But from the desktop computer in my office using the same PUTTY I could ssh to remote machine. I have tried to follow several comments but none has worked for me. Please, I need help.

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• Debian virtual server hangs on reboot, need help debugging

  - by BubuIIC

  I'm admin of a Debian 6 virtual server. I've been trying to diagnose this problem for a while but haven't gotten anything. The server hangs every time I want to reboot it. All services seem to be shutting down, I lose ssh connection. Then nothing. I have to restart it through the hoster's web-interface, which just gives me the options "Normal Boot" and "Rescue System". Normal boot then brings the server back to life. Possibly (probably?) related, the server does not boot into a newer kernel version, it's running 2.6.18 right now, but installed is actually 2.6.32. I don't know whether it hangs on shutdown or on startup, but booting through the web-interface works (except the kernel part). Am I missing something obvious? Where should I start looking? I have no idea how to diagnose the problem.

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• Is it safe to Update and/or Insert records into an accounting software's database? (Pastel Evolution)

  - by user1020317

  Our CRM system can post transactions to our accounts software (Pastel Evolution), but it doesn't perform the required currency conversion. Both systems have different "base" currencies (because of our location), so the figure thats sent to Pastel evolution is right, but it is reflected in the wrong currency. The CRM uses an ODBC connection to post figures to Evolution. I can make a tool which sits between the two systems which can update and/or insert the transactions into Pastel, by mimicking what the CRM would have done if it was doing the POST. Is it safe for me to mimic and/or update these transactions directly in the Pastel database? Is it common for important validation to be performed in the ODBC layer, and if so, can I tap into an applications ODBC, or is there a custom driver built by the CRM to communicate with the DB?

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• Windows 7 unidentified network (or limited access) after hibernate.

  - by null

  My windows 7 network will show limited access or unidentified network after coming up from hibernation. In the office I normally use LAN connection, I turn-off my wireless card (DELL Latitude has on/off switch for the wireless card). When I back at home I will turn on the wireless card, but it will take about 15 seconds to detect my home WIFI and then show limited access. I will have to restart the notebook and it will be able to connect to my WIFI and internet. The problem will be solved if I restart the notebook, but that defeats the purpose of hibernation doesn't it? I have tried uninstalling the wireless card driver but still does not solve it. I also tried updating my network card driver but windows says I am using the latest driver. On support.dell.com also showing I am using the latest driver.

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• Does Asus F8SV supports 1920*1080 resolution through DVI output? [closed]

  - by Col

  Devices: Asus F8Sv Laptop (Windows 7 ultimate, GeForce 8600m GT, display driver is 301.42, detected and downloaded from nvidia.com, VGA and DVI output interface) Gateway 23 inches LCD monitor (VGA, DVI-D with HDCP, and HDMI input) 18 pins DVI cable, VGA cable, both new. Problems: When connect laptop to monitor by VGA, resolution is automatically adapted to 1920*1080; but when using DVI connection, resolution on monitor is fixed to 1024*768, which is lower than my laptop default 1280*800. The maximum resolution in windows control panel is only 1024*768, while the Nvidia control panel provides options 1920*1080p and 1920*1080i, but clicking apply button does not work, the resolution just can not change. Possibly reason I guess: GeForce 8600m GT does not support 1920*1080 resolution through DVI outputs. Can anyone confirm it or give the real reason? edit: Problem solved by buying a HDMI to DVI-D adapter. Using this adapter and a HDMI cable, I can now enjoy 1080p movie.

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• How to determine if my router is causing a bottleneck in uploads?

  - by Jimi

  I have a home network with a cheap-o little router with a development server and a few devices hooked up to it. I am finding that backups of my server are taking FOREVER (a week for 60gb) running backups renders my internet connection useless from any other box int he house. I have maxed out the pipe to my house from the ISP (10down, 3up), but is there a way for me to test and see if my router is bottlenecking anything? I feel like 60gb backups shouldn't take this long so any help would be great!

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• Large OSX 10.6 to Windows 7 smb transfers fail?

  - by user41724

  I'm connecting to a windows 7 box from a OSX 10.6 box via smb: smb://ftp1 Connection works fine, I can transfer individual files one at a time, but as soon as I try and move an entier folder I get the following error: The Finder can’t complete the operation because some data in “test” can’t be read or written. (Error code -36) This error happens on all our OSX boxes when trying to push the entier folder to the Win7 box. The folder TEST in the above error message has -R 777 permissions. I can move every image file to the windows box one by one with no errors. But if I try an move the entier folder. bam error out. This error seems to kill the smb client on the Windows box as well. There's an FTP server on the windows box and I can FTP in from the OSX box and move everything just fine. Not sure what is going on here?

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• Realtime website slowness (PHP/MYSQL)

  - by 3s2ng

  We got a website with realtime transactions. The past few days we experienced some slowness during a period of time. Usually the slowness last for 5 minutes. And also during the slowness we noticed that sometimes we can not connect to SSH and FTP or sometimes very slow to connect to those services. Currently we are trying to identify the issue. We already setup database monitoring tool. Now are about to signup with pingdom.com My question is. If the website is too slow due to the database (table or row lock) will it affect the other services like SSH and FTP? Does the ping correlates the page load and the connection between my PC and server? Thanks, Mark

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• Security against IP spoofing [on hold]

  - by user1369975

  I am pursuing a college project, in which I am running three fake services on three ports to protect the main service (say running at port 80). The concept is that if the user is malicious, he'll try to bring the services down and access the fake services. These ports adopt a blocking process of a connection request and record the IP and port of the client. These are logged and aren't granted access on service on port 80. But what to do if the client spoofs his IP? How can I modify my system?

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• ssh tunnel through an intermediate host

  - by user1190650

  I have configured an SSH tunnel to forward my web traffic from hostA to hostC using this command on hostA: ssh -D 2222 user@hostC after configuring my browser to use a proxy on port 2222. This works great. However, I now want to forward the same traffic through an intermediate SSH connection on hostB in order to get to hostC. I tried this on hostA: ssh user@hostB -L 2222:hostB:22 but I get "channel x: open failed" errors. Does anyone know the correct way of doing this?

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• Upgraded from 11.10 to 12.04 now no network access

  - by MadeTheLeap

  A few weeks ago I decided I should enter the Linux world and read that Ubuntu is the most widely used release. I installed version 11.10 and it worked perfectly. Just this past week I decided I would do the upgrade to 12.04. The upgrade process itself worked fine. However, when I logged in I no longer had a network connection. I am running an AMD-based PC with a D-LINK DFE-530TXS network card and as I said, it worked fine in 11.10. I have scoured the Internet and come across a thousand slightly varying solutions, but they are too convoluted for someone new to Linux. Not because I can't follow the steps, but because most of the tools/utilities that are referenced (e.g. to compile, install, etc.) are not available when I use the stated steps in the solutions. So....should I re-install 11.10 or is there hope in getting this version to use the NIC that I know works. I have the latest driver from d-link for my NIC but I have no idea how to 'install' it for Ubuntu 12.04 to use. I know you will require additional information, but I wasn't sure what you would need. Thanks in advance.

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• how to stop deferred emails

  - by Will K

  I have a postfix mail gateway. At the same time, every other host is set to use this gateway as the relay. We have some automated outgoing emails sent from some hosts. I believe the gateway trys to send a deferred status back to the system started this. But that system is a null client, which sends but not receive any email Is there anyway to stop sending the deferred status? e.g. postfix/smtp[35725]: 2F6A155C256: to=, relay=none, delay=260862, delays=260862/0.01/0/0, dsn=4.4.1, status=deferred (connect to orange.mydom.com[192.168.1.5]:25: Connection refused) Thanks

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• How to route address into VPN network?

  - by ActioN

  I have an internet connection and some site named as svn.mycompany.com. I can access it from my own home computer. But our company have an private VPN, and when I connect to it, I lose access to svn.mycompany.com, but other internet sites is available. When I run nslookup from internet, svn.mycompany.com have one IP, and when run from VPN - other IP. Maybe I need to create route to this address? And if it is, can you help me to write correct command in Ubuntu Linux.

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• Ubuntu server security; Is this enough?

  - by Camran

  I have a classifieds website, which uses php5 and mysql, and also java (solr). I am new to linux and VPS... I have installed SSH, and I have installed IPtables, and also I have PuTTY which I use as a terminal. Also, Filezilla is installed on my computer, and whenever I connect to my VPS, the "host" field in Filezilla says "Sftp://ip-adress" so I am guessing it is a safe connection. I used this command to find out if I had SSHD installed: whereis sshd and it returned some places where it actually was installed. So I havent actually installed it. Now, my Q is, is this enough? What other security measures should I take? Any good articles about security and how to set it up on a VPS? Remember, I have a windows xp OS on my laptop, but the OS for my VPS is Ubuntu 9.10. Also, I have apache2 installed... Thanks

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• Remote Linux system via Windows 7

  - by kaila

  I have a dual boot with Windows 7 and Fedora. Though I can long into both without any problems, I am trying to log in to the linux account via the Windows account. Is that possible? Or, is it possible to access my university's linux server via telnet from home? I did so and got an error, with cold not connect to port 23 message. Also, since most of my mail accounts are on Windows, the passwords to which I have forgotten, I would prefer working on a ;remote' connection.

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• How to access network shares, printers, etc.through Windows 7 Built-In VPN?

  - by mbrion

  After I have successfully connected to a Windows 7 box via the built-in VPN: how do I access shares, shared printers, network appliances, etc.? So, call me bad at googling, but: I can find dozens of articles on "How to Set up a VPN Connection" and "How to connect to a VPN" for Windows 7... but I can't find a single article on how to access resources after connecting. I have a home VPN set up in Windows 7; I was able to connect to it from my friend's Windows 7 machine last night. I expected to be able to UNC into my shares; I also expected to be able to go to "Start Computer" and Click "Network" on the left side, and then see all of the devices on my home network (while the VPN was connected). Am I missing something obvious? How do I make this happen?

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• How many site visitors can my server handle? [closed]

  - by coolboycsaba

  I have a website, and I want to host it on my own computer, but I'm wondering if it's good enough. The website checks if the user is logged in and then displays 15 items (title, description) from a mysql database and the rating (stored in another database) and the comments (another database) for each item. It also displays some stats (number of items, comments). I also have an image for each item. My specs are: AMD Athlon 64 X2 Dual Core Processor 5600+ 2.90 GHz RAM: 4.00GB Windows 7 64bit So what do you think, how much visitors and items could it handle (at once or daily) ? My internet connection is good, around 7-10 mb upload and same download speed

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