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• export block device over network without root

  - by dschatz

  I'm trying to export a file as a block device over the network. I do not have root access on the machine where the file exists. I do have root access on the machine(s) where I will mount the block device. I've seen ATA-Over-Ethernet and ISCSI but there don't seem to be any implementations which allow me to export the block without root at least (some even require kernel modules). Is there an implementation of either of these or some other protocol that doesn't require root? Perhaps I can tunnel ethernet over IP to do this?

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• PDAnet on Android IP on PC is not public IP. Where does the NAT take place, PDAnet or Verizon?

  - by lcbrevard

  When using PDAnet on a PC (Win7 ultimate) to USB tether a Motorola Droid on Verizon 3G the IP address of the PC appears to be public - 64.245.171.115 (64-245-171-115.pools.spcsdns.net) - but connections show as coming from another public IP - 97.14.69.212 (212-sub-97.14.69.myvzw.com). Someone is performing Network Address Translation - either PDAnet or within the Verizon 3G network. Can someone tell me who is doing the NAT? Is it PDAnet or is it at Verizon? Is there any possibility of setting up port forwarding, such that connections to the public IP 97.14.69.212 (212-sub-97.14.69.myvzw.com) are forward to the PC? We are testing a network protocol that requires either a true public IP or forwarding a range of ports from the public Internet to the system on which the software runs (actually Linux hosted by VMware Player or Workstation on a PC running Windows).

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• When can an FTP server close its passive connections?

  - by Don Kirkby

  Does the FTP protocol allow the server to close any of its passive connections while the client is still connected? Can it tell when the client is finished receiving and then close the connection? I'm including an FTP server in my application using the pyftpdlib Python project. I've got it to work in active and passive mode, but I'm a bit concerned about when it closes its passive connections. I've tried connecting to it with both FileZilla and the default ftp command in Ubuntu, and in both cases, I get a new passive port for every request. That is, if I sit in the root folder and type ls 10 times, I use up 10 ports. This means that I have to allocate a big block of passive ports for the FTP server to use so it won't run out. As soon as the client disconnects, the server releases all the passive connections associated with that client and those ports can be reused. However, a long-running connection could use up a lot of ports.

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• cannot access my own computer through My Network Places

  - by WebMAOhist

  My home Windows XP Pro SP3 machine is DHCP client receiving configurations from ISP. Trying to access in WindowsExplorer -My Network Places - Microsoft Windows Network shows Workgroup with a delay of 3 min and then popups messagebox: Microsoft Windows Network Workgroup is not accessible. You might not have permission to use this network resource. Contact the administrator of this server to find out if you have access permissions.The list of servers for this workgroup is not currently available OK I am logged-in as local machine Administrator. The internet is accessible (I am writing this post through it) The Firewall is disabled The "Computer Bowser" and all networking services, I could find, are running Control Panel -- Network Connections -- Properties (of connection) --- Internet Protocol (TCP/IP), btn Properties --- --- tab General, btn "Advanced..." -- tab WINS-- rbtn "Enable NetBIOS over TCP/IP" checked Why cannot I access my own PC (and shares on it) through My Network Places What is the possible problem? How to daignose the problem?

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• Using VLC to Unicast High Definition Webcam over local gigabit LAN with low/zero delay

  - by Robin Day

  We're setting up a webcam "window" between two offices in the same buildilng. The two PC's are connected to the same gigabit switch. We're using VLC to stream the webcam over HTTP using the following commands. vlc dshow:// :dshow-caching="0" :dshow-size="640x480" :sout=#transcode{vcodec=h264,vb=0,scale=0}:http{mux=ffmpeg{mux=flv},dst=:8080/} :no-sout-rtp-sap :no-sout-standard-sap :ttl=1 :sout-keep vlc http://192.168.0.1:8080 :http-caching="0" Even with the caching set to zero, the delay in the image is a good 2-3 seconds. The CPU usage of each pc is also maxed. I'm guessing it's the transcoding that's causing much of the delay. Can anyone give me some changes to these command lines that will reduce the transcoding power, or send the webcam over a different protocol, or anything that will reduce the delay of the cameras? Bandwidth is not an issue at all as the pc's can be connected to a dedicated switch/vlan if required.

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• Inaccurate bandwidth limiting in altq queues

  - by overkordbaever

  I'm setting up an environment where I have one Linux server, one OpenBSD router and one Linux client and I want to be able to limit how much bandwidth the client should be able to use. I've been performing these tests with "netcat" and "time" (using time to measure the time of the transfer with netcat), and what happens when trying these tests (using the TCP protocol, the queues will for some reason not work with UDP) is that the queues aren't exact at all. For example: when setting a bandwidth limit of 10mbit, the client cannot use more than five mbits, when setting a limit of 100mbit, the client cannot use more than around 50mbit. The config looks like (using a 100mbit limit in the example): #queue rules altq on { $int_if, $ext_if } cbq bandwidth 100Mb queue { def, low } queue def bandwidth 0Mb cbq(default) queue low bandwidth 100Mb cbq(default) #Passrules test pass out quick from $int_if to $ext_if queue low pass in quick from $ext_if to $int_if queue low pass out quick from $ext_if to $int_if queue low pass in quick from $int_if to $ext_if queue low

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• Is Page-Loading Time Relevant?

  - by doug

  Take this (ServerFault) page for instance. It has about 20 elements. When the last of these has loaded, the page is deemed "loaded"--but not before. This is certainly the protocol used by our testing service (which is among the small group of well-known vendors that offer that sort of service). Obviously this method is based on a clear, definite endpoint--therefore it's easy to apply w/ concomitant reliability. I think it's also the metric used by the popular Firefox plugin, 'YSlow.' For my employer's website, nearly always the last-to-load items are tracking code, tracking pixels, etc., so from the user's point of view--their perception--the page was "loaded" well before it had actually loaded based on the criterion used by our testing service (15-20% is a rough estimate). I'm sure i'm not the first person to consider this nor the first to wonder if it is causing micro-optimization while ignoring overall system-level, or user-perceived performance. So my question is, are there are other more practical (yet still reasonably precise) measures of page loading time?

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• Running IPv4 program in IPv6 network

  - by stobyer

  I have an IPv4 windows client program and IPv4 Linux server. What I need is to run them in pure IPv6 network, although machines have dual stack. At the beginning I thought it's not a problem: I'll use 4in6 protocol (rfc2473) and that's all. I found a simple guide for Linux configuration here, but when I started to configuring windows 7, I couldn't find how to do it. There are plenty of info on how to tunnel IPv6 over IPv4 (6in4, Teredo) but not an opposite. Does anyone know how to do it? Thank you.

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• changing the default port no of tomcat in ubuntu

  - by codeomnitrix

  Hii all i am trying to change the port no of my tomcat server installed in ubuntu. for this i have changed the file server.xml and made a change there as: <Connector port="8081" protocol="HTTP/1.1" connectionTimeout="20000" URIEncoding="UTF-8" redirectPort="8443" /> But the problem is that whenever i try to open the localhost:8081 it is working fine but when i tried to open localhost:8080 then it is still accessible. So please explain this why this is happening. Secondly when i made the default port to 80 then localhost:80 or localhost then it was not accessible. So please explain this why this is happening. Thanks in advance.

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• Netcat UDP File Transfer Between Two Servers Times Out?

  - by Mark Bowytz

  I'm testing file transfer speeds between two Red Hat servers that are connected to the same switch within the data center and I decided to use netcat to eliminate protocol overhead as much as possible. Testing in TCP mode went well and I was wondering how UDP might fare. On my receiving (client) end, I ran this: nc -u -l 11225 -v > myfile.out And then on the sending (server) end I ran the following: cat myfile.out | nc -u myserver.foo.zzz.com 11225 -v The file I'm testing with is 38 GB but the transfer seems to stop at around 15 GB (one time at 14.9, another at 15.6). I've tested by adding a "-w 5000" just in case it's timing out but no joy. Adding the -v doesn't show anything except acknowledging that the connection occurred. No errors. So - any suggestions as to why would the transfer cease?

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• AWS:EC2:: Could not connect FTP client?

  - by heathub

  My Server OS: Amazon Linux I am trying to set up ftp. I have: Installed vsftpd open port 20-21 open port 1024 - 1048 Basically, I followed every of these steps Start vsftpd service (the status indicate [ok]) I use filezilla for my ftp client. Here is my setting/configuration: Host: ec2-XX-XX-XXX-XX.compute-1.amazonaws.com Port: -(blank, but I have tried 20 and 21 though) Server Type: FTP - File Transder Protocol Logon Type: Normal Username: (tried root and ec2-user) Transfer mode: Tried passive and active I always has this error: Status: Waiting to retry... Status: Resolving address of ec2-XX-XX-XXX-XX.compute-1.amazonaws.com Status: Connecting to XX.XX.XXX.XX:21... Error: Connection timed out Error: Could not connect to server Have I missed any configuration/settings? EDIT After execute the /sbin/iptables -L -n Here is the result: Chain INPUT (policy ACCEPT) target prot opt source destination Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination

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• Rsync : execute permission required

  - by user651488

  I'm using rsync between two servers to transfer files. The problem is some files are not transferred. I get this error : rsync: readlink "/var/www/index.html" failed: Permission denied (13) So I check permissions on the server and after make tests, I notice a file is transferred only if it has these permissions : R-W ! If the file have these permissions : R--, Rsync can't download it !? Command: /usr/bin/rsync -avzr -e "/usr/bin/ssh -i /home/replication/thishost-rsync-key" [email protected]:/var/www/index.html ./ Is it a bug with Rsync ? I find any information about this problem. Thanks for your help Debian Etch 2.6.30 Rsync 2.6.9 protocol version 29

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• file copy error from system to cifs mount

  - by dwpriest

  When coping a file greater than 64kB from an Ubuntu server to a CIFS mounted windows share, most of the data is copied, but it seems the last chunk doesn't get copied. The size doesn't match, and the md5 check sums don't match. I have plenty of file space, but then I use cp, I get the following... cp: closing `cloudBackup/asdf.txt': No space left on device Using rsync, I get the following... rsync: close failed on "/home/fluffy/cloudBackup/.asdf.txt.qrBWe6": No space left on device (28) rsync error: error in file IO (code 11) at receiver.c(752) [receiver=3.0.8] rsync: connection unexpectedly closed (29 bytes received so far) [sender] rsync error: error in rsync protocol data stream (code 12) at io.c(601) [sender=3.0.8] I have full read/write permissions on the mounted share. I can copy via SSH just fine. Any ideas? Thank you

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• check_ssh executed from Nagios server returns "Server answer: ", nothing else

  - by phs

  Commmand works on the host I need to monitor (its IP is denoted as $HOSTADDRESS$ here): [root@host ~]# /usr/local/nagios/libexec/check_ssh localhost SSH OK - OpenSSH_4.3 (protocol 2.0) However, on the Nagios server, it does not: root@server:~# /usr/lib/nagios/plugins/check_ssh -H $HOSTADDRESS$ Server answer: I can see that the port is open: root@server:~# /usr/lib/nagios/plugins/check_tcp -H $HOSTADDRESS$ -p 22 TCP OK - 0.123 second response time on port 22|time=0.123277s;;;0.000000;10.000000 And I can verify with telnet: root@server:/etc/nagios3/conf.d# telnet $HOSTADDRESS$ 22 Trying $HOSTADDRESS$... Connected to $HOSTADDRESS$. Escape character is '^]'. After searching the web for two hours and trying different suggestions I am out of ideas. I have several other hosts with similar setup, and they don't have this problem. I have compared the configs and they look the same (I think). I am clearly missing something here.

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• Network Block Device (NBD) clients for Windows or similar solutions

  - by przemoc

  Are there any NBD clients for Windows? Strangely, I cannot find any, or I am searching for them in a wrong way. Such client should be possibly a driver with front-end tool (may be a command-line one) allowing to create virtual drives and associate them with given hosts (or simply localhost) and ports where NBD servers are listening. From user perspective virtual drive should be close to what physical drive is, so it should be accessible as something like \\.\PhysicalDriveX (maybe \\.\VirtualDriveX?), be visible in Disk Management (diskmgmt.msc) and mountvol tools at least. (The only thing I found remotely close to NBD on Windows is ImDisk's proxy mode and companion tool devio, but AFAIK ImDisk only works at partition level (so no virtual drive) and devio uses different protocol.) Secondary question is: Are there any (preferably simple) Windows-specific solutions allowing creation of virtual drive delegating read/write request to user-space via some explicit way (like via TCP, IPC, DLL implementing given API, etc.)?

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• Why can't SVN checkout into a virtualbox shared folder?

  - by Alex Waters

  I am trying to checkout into the virtualbox shared folder with svn 1.7 in ubuntu 12.04 running as a guest on a windows 7 host. I had read that this error was a 1.6 problem, and updated - but am still receiving the error: svn: E000071: Can't move '/mnt/hostShare/code/www/.svn/tmp/svn-hsOG5X' to '/mnt/hostShare/code/www/trunk/statement.aspx?d=201108': Protocol error I found this blog post about the same error in a mac environment, but am finding that changing the folder/file permissions does nothing. vim .svn/entires just has the number 12 - does this need to be changed? Thank you for any assistance! (just another reason for why I prefer git...)

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• Windows Filtering Platform not turning off until admin logon. Win2008R2sp1

  - by rjt

  Just installed Windows Server 2008R2 SP1 to see if it would fix this problem, but it didn't. Until an administrator logs onto the domain controller, there are many events that WFP blocked a connection from Server60 to Server60 or Server60 to Server70. Both server60 and server70 are the domain controllers. One the admin logs on, the WFP events stop. The firewall is off by default GPO. Yes, i know that the WFP kicks in during the boot up sequence until the firewall takes over or in my case does not take over (since Vista), but i clearly should not have to autologon to a domain controller and call autolock or something. Example event LEVEL = Information Source = Microsoft Windows Security Auditing EventID = 5152 "Filtering Platform Packet Drop" and its evil twin id = 5157 "Filtering Platform Connection" "The Windows Filtering platform has blocked a connection." Direction %%14593 SourceAddress 192.168.10.60 SourcePort 49677 DestAddress 192.168.10.60 DestPort 389 Protocol 6 FilterRTID 65667 LayerName %%14611 LayerRTID 48 RemoteUserID S-1-0-0 RemoteMachineID S-1-0-0 windows-server-2008-r2 WFP BFE WindowsFilteringPlatform BaseFilteringEngine

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• Is it possible to use bittorrent for a fileserver

  - by sris

  I would like to set up a file server that is searchable, preferable via the web. I'm wondering if it would be possible to achieve this using the bittorrent protocol and have a single client sharing every single torrent on the server. I guess I could use some available tracker solution for the webinterface or write one myself. My concerns are the if there are any limits to the number of torrents a single client can share since this may potentially be 10k torrents. The number of downloading clients is very small, only myself and my relatives. The idea is to have a single place to host everything from vacation photos to musical creations. Is there any other options for this kind of file server. It should also be easy to upload files to the server.

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• afp/smb transfers caps at 2 megabytes/sec, wireless N

  - by RD.

  I wanted to transfer files between two mac computers. The network is wireless-N and both computers have wireless-N modules in them. The problem is that when I transfer files between them, via file sharing (afp) the network speed caps at 2 megabytes/sec. Just downloading files from the internet I can get faster speeds, so this isn't a constriction of my wifi bandwidth, it appears to be a constriction of the protocol being used. My wifi-n is set to 130mbits, so I should see real world transfer speeds around 12-16 megabytes/sec I did this command on both computers sudo sysctl -w net.inet.tcp.delayed_ack=0 which is supposed to lower tcp overhead, but this did not affect it. How can I get the speed I am expecting?

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• How can I send raw postscript to a remote printer via CUPS?

  - by Ash

  I have an ancient fax device with a printer interface that only accepts postscript level 1 documents formatted in a specific way. I only have access to this printer over the lpd:// protocol. I have some old documents from our previous system that work fine on our Unix machines, but they are altered somehow by CUPS when I use lp on our Linux system. The PDF files that end up in the print queue are significantly modified versions of the original, and although they still render in ghostscript, they don't do anything on the printer. I'm wondering if there's a way to tell CUPS "don't process this, just send it to the printer without modification", or whether there's a lpd client or procedure I could try?

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• SQL connection is too slow

  - by user66905

  We have a business web application in ASP.NET + SQL Server 2008. In the beginning, SQL Server and IIS were on the same machine. Now we bought another machine. Current configuration is IIS machine plus SQL Server machine, and they are connected by a 1gb LAN connection. With this configuration our web application is slower than before. Max bandwidth is 1-2% of network, about 15mbps. When we use another threads to the same SQL Server from the same IIS machine, network use is higher. So this is no problem with SQL Server. Ho we can make higher bandwidth for this SQL connection? Specs: .Net 3.5 SQL Server 2008 Standard file transfer can use 100% of LAN SQL connection by TCP/IP protocol SQL logins Pool tested with enable and

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• Reasons for firewall alerts from ICMPv6 Local Link Address unreachable?

  - by Pulse

  For some reason I'm receiving numerous alerts, for a variety of processes, from my firewall. These are all related to ICMPv6 and are the same, apart from the process for which the alert was generated. 'Application/Process' Is trying to Access the Internet Remote Address - fe80::7191:6bd1:e5fa:58af [The Link Local Address] ICMP Type = 1 [Destination Unreachable] ICMP Code = 3 [Address Unreachable] Protocol = ICMPv6 Allow or Block If I Allow or Block, the alert never reoccurs. I understand what the various elements of these messages represent, I just can't fathom out why they are being generated. What could be the reason for these Alerts? OS - Windows 7 x86 Ultimate Thanks

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• How do networking ports work? Can I configure the ports that client and server use?

  - by joedotnot

  Let's say i have a "server" program listening on address 1.2.3.4:69 (i.e. remote port 69) When i connect from a "client" program to it, typically i would specify the IP address + port of the target or server system; But what port would the client be using ? And how does the server know which port to connect back to the client on? I understand this question is very general, but just wanting to get a general feel for how things work. Then extending this to a specific protocol, say FTP (typical port 21), can I change it such that the server uses port 69, but the client uses port 100? And similarly, for Remote Desktop in WinXP (typical port 3389), i know how to change the server port to be something other than 3389, but how does one change what port the client uses (if at all possible)?

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• L2TP Site to Site VPN issues

  - by Chris Lively

  I have a windows 2008 r2 server that needs to establish a VPN connection to a remote VPN server. We're using the L2TP protocol with a pre-shared key. I initially used the New Demand Dial interface wizard. Then I went into properties on the interface and set the type of VPn to L2TP/IPSec and put the key under the advanced settings. The error I received when attempting to connect is: An error occured during connection of the interface. A Demand Dial Router attempted to connect over a port that was reserved for Remote Access Clients only.

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• rsync windows to linux permission denied

  - by user64908

  Using Command rsync -avzP --delete --omit-dir-times ../../ [email protected]:/var/www/mysite/ I'm getting rsync: mkstemp "/var/www/mysite/.." failed: Permission denied (13) If ext is in the www-data group should I still set all the files to be owned by user www-data? I am trying to publish the files with rsync and then set the permissions using sudo chown -R www-data doc sudo chgrp -R www-data doc but I can't even rsync because of the permission denied. The SSH works fine, the rsync too except when it tries to write over or update some of the files in /var/www Client * Windows 7 * Cygwin 1.7.16 (GNU bash, version 4.1.10(4)-release (i686-pc-cygwin)) * rsync version 3.0.9 protocol version 30 Server * Ubuntu 12.04 * Apache2 * Root Accounts [ubuntu,ext] * Groups [www-data] * sudo vigr has www-data:x:33:ubuntu,ext I have already configure this http://stackoverflow.com/questions/2124169/cwrsync-ignores-nontsec-on-windows-7 This article has also managed to confuse me http://unix.stackexchange.com/questions/41687/how-should-i-rsync-files-in-var-www-if-i-want-them-to-be-owned-by-www-data What is the right procedure?

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