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• Windows XP/Firewall -- Can't open UDP port 9100 for JetDirect sharing

  - by Barton Chittenden

  I'm setting up my Dad's laptop (Vista) to print to an HP Deskjet printer attached to a Windows XP Desktop box. The XP box is running Windows firewall. Laptop sits on 192.168.1.66, Desktop 192.168.1.65. I set up logging in the firewall, and determined that it is dropping inbound packets on TCP port 9100, used by JetDirect, the printing protocol. I set up an exception on TCP port 9100, allowing access to the local subnet. There's also an entry under the 'allow applications' tab which was marked for the exact printer model. I selected this as well, then tried to print again... I see more dropped packets from 192.168.1.66 to 192.168.1.65 for TCP port 9100. What do I try next?

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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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• 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 to determine what program send the packet recorded in Wireshark?

  - by Tono Nam

  I was taking some tutorials on Wireshark in order to analyze the packets sent and received when talking to a web server for purposes of learning. When I start listening/recording packets in Wireshark, there where so many packages being recorded (700 packages per minute). Is it normal to have that much traffic if I have all the programs that will cause traffic such as all browsers, log me in, dropbox, goto meeting, etc., closed? In order to try to solve the problem I am analyzing random packets. Take for instance this filter: I just selected a random IP: 74.125.130.99. So how can I know from what program those packets where created? Also how can I get more info about that communication bwtween my computer (192.168.0.139) and that server (74.125.130.99)? I just selected a random IP from the Wireshark capture. There are also other IPs that I have no idea why they are communicating with my computer. How can I figure that out?

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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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• Is visiting HTTPS websites on a public hotspot secure?

  - by Calmarius

  It's often said that HTTPS SSL/TLS connections are encrypted and said to be secure because the communication between the server and me is encrypted (also provides server authentication) so if someone sniffs my packets, they will need zillions of years to decrypt if using brute force in theory. Let's assume I'm on a public wifi and there is a malicious user on the same wifi who sniffs every packet. Now let's assume I'm trying to access my gmail account using this wifi. My browser does a SSL/TLS handshake with the server and gets the keys to use for encryption and decryption. If that malicious user sniffed all my incoming and outgoing packets. Can he calculate the same keys and read my encrypted traffic too or even send encrypted messages to the server in my name?

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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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• 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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• controlling the bandwidth using tc

  - by Supratik

  Hi I have two NIC etho is connected to the internet and eth1 is connected to the LAN. I want to restrict the download limit using iptables and linux tc. So I wrote a test script to verify if it is working. My iptables configuration is as below. iptables -t mangle -N INBOUND iptables -t mangle -I PREROUTING -i eth0 -j INBOUND iptables -t mangle -A INBOUND -j MARK --set-mark 60 My ingress configuration is as below. tc qdisc add dev eth0 handle 1: ingress tc filter add dev eth0 parent 1: protocol ip prio 1 handle 60 fw police rate 100kbit burst 20kbit drop flowid :1 Can you please tell me what I am missing here ?

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• Dreamweaver not connecting RDC

  - by thomas

  I am trying to use Dreamweaver to Remote Desktop Connect into a computer where a website is hosted. Normal traffic to this server is routed to another domain, but when accessed by IP (it is my understanding) the traffic never hits any sort of nameserver request, and so stays there. This server is set up so that the only way I can access it is RDC. I can connect using an RDC program, but when I attempt to use Dreamweaver, I get a vague error. The desired action could not be completed because an unexpected client/server communication error occurred. I have Web URL as http://my.ip.number/directory And in the settings panel, I have Host name: my.ip.number Port: 3388 Host directory: C:\Program Files (x86)\directory/directory Username: user Password: ••••••• What could be preventing Dreamweaver form connecting? Thanks! SERVER DETAILS It is a virtual server Windows SERVER 2008 R2 Standard Service Pack 1

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• Network based on Netgear FVS318 extremely slow

  - by Fentible

  A network I maintain uses an FVS318 as a router, with a separate switch. Communication within the network is slow. Out to the internet is even slower. As it stands there is one patch from the FVS to the switch and no other devices directly connected to the FVS because any that are run so slowly they might as well not be connected to the network. Swapping in a bog-standard home router dramatically increases network speed, but that's not a viable solution because some of the enterprise features of the FVS are required. There are quite a few complaints about this on the Netgear forum, but Netgear support have not been forthcoming with any help - so I turn to you all: any ideas?

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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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• 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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• 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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• Tunneling over IPv4 network

  - by JoesyXHN

  Hi, Most of the articles I have read about Tunneling. It describes that the tunneling supports for communication between 2 IPv6 networks over (crossing) an Ipv4 network. For example: TUNNEL A (IPv6) ==> INTERNET NETWORK (IPv4) => TUNNEL B (IPv6) Would it be doable for: TUNNEL A (IPv4) ==> INTERNET NETWORK (IPv6) => TUNNEL B (IPv4) Please give me an answer with elaborate explanation. Thanks in advance.

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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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• Suggestion for live video stream aggregation/switching/forwarding/management software?

  - by deceze

  I'm looking for a software or system that can receive video streams from a number of cameras via a network (RTMP or similar protocol), present a visual overview of all video streams and allow me to forward/send a selected stream to another service (e.g. to a Flash Media Server, or anywhere via RTMP). Basically the digital internet equivalent of a TV studio control panel, which allows a director to put together a live show. Is there any such software at an affordable price? A GUI-less server which can be scripted to switch streams would be good too. I'm not even quite sure what kind of product category this falls into or what search terms to plug into Google. Most results I have come up with have little more than an executive summary description which doesn't tell me anything. Any suggestion welcome.

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• MySql sevice stops under 2008 r2 x64

  - by volody

  I have installed MySql 5.5 server under windows 2008r2 x64 Apparently I can see that it stops even if is configured to start automatically What can I do to find out why this is happening? MySql database is used as backend of ASP.Net web site Is it possible that web site was not active for a while and system stop mysql service? Update: It was mysql-5.5.7-rc-winx64. I could an issue with this version. Now I am trying to install mysql-5.5.8-winx64 And I have an issue with configuring MySql to work using name pipes I did uncheck use of TCP/IP protocol and configuration wizard just hangs

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• Proxying/Tunneling IPSec traffic via netcat or SOCKS?

  - by MattC

  I have a client that is using a SonicWall router as their VPN concentrator. I downloaded the client software and set up the router as a peer. My issue is that my company uses a dual DMZ setup, meaning we have an interior firewall, then a bunch of DMZ servers, then an external firewall, then finally the telco router. In this setup, the interior firewall has no way to communicate with the exterior firewall since they are on two totally separate subnets. The communication occurs through the servers that straddle the networks. In this case, I need some way to forward the ISAKMP/IPSec traffic from my desktop out to the Internet. My usual trick of using netcat on the intermediate proxy server doesn't work here since it's not TCP/UDP traffic as far as I can tell. All of my previous experience with VPN's have been using SSL-based VPN's which are clearly very easily proxy-able. Any help would be appreciated, thanks!

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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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• How is it possible for SSD's drives to have such a good latency?

  - by tigrou

  First time i read some information about SSD's, i was surprised to learn they internally use NAND flash chips. This kind of memory is generally slow (low bandwidth) and have high latency while SSD's are just the opposite. But here is how it works : SSD drives increase their bandwidth by using several NAND flash chips in parallel. In other words, they do some data striping (aka RAID0) across several chips (done by the controller). What i don't understand is how SSD's drives have such a low latency, whereas they are using NAND chips? (or at least lot better than what a typical single NAND chip would do) EDIT: I think under-estimate NAND chip capabilities. USB drives, while powered by NAND's are mostly limited by USB protocol (which have a pretty high latency) and the USB controller. That explain their poor performance in some cases.

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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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• Mounting share over VPN

  - by user1337

  I have a CentOS 5 web server which currently mounts a NFS export on my Mac OS X 10.7 laptop. It works great, except over VPN I can't get it to mount at all. I tried SMBUp but haven't been able to get it working even locally. It doesn't look like there's an easy way to install netatalk for CentOS 5. Even still, I'm not sure if that's the best way to do it. I tried using a GUI SSH client that can "mount a FTP disk" and it would work, except the files require root access and there's no external root access and the client can't elevate permissions. The basic thing I need to do is have the server be able to read the files off of my laptop, connected via VPN. The files are frequently updated (every 5-20 seconds) so I don't want to manually do that via SSH. Which protocol can work with both platforms and easily handle the latency introduced by VPN (and potentially mobile broadband)? Thanks

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• Windows 7 is blocking ports

  - by Caleb1994

  I am trying to open port 80 and 3690 for HTTP and svnserve respectively. I have Windows Firewall off, and have tried temporarily disabling Mcafee VirusScan Enterprise, to no avail. According to http://www.yougetsignal.com/tools/open-ports/, both ports 80 and 3690 are still blocked. I can't think of what would be blocking them if Windows Firewall and my antivirus are disabled. Here is the output of netsh firewall show state Firewall status: ------------------------------------------------------------------- Profile = Standard Operational mode = Disable Exception mode = Enable Multicast/broadcast response mode = Enable Notification mode = Enable Group policy version = Windows Firewall Remote admin mode = Disable Ports currently open on all network interfaces: Port Protocol Version Program ------------------------------------------------------------------- 3690 TCP Any (null) 22 TCP Any (null) 80 TCP Any (null) 1900 UDP Any (null) 2869 TCP Any (null) Any help? I'm not sure what each item on the list of enabled/disabled items is, but "Operational Mode" is disabled, so I assume that one refers to me disabling Windows Firewall. I know that since Windows Firewall is off, this output might not be useful, but I figured I'd include it just in case, haha.

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• Windows 7 is blocking ports

  - by Caleb1994

  I am trying to open port 80 and 3690 for HTTP and svnserve respectively. I have Windows Firewall off, and have tried temporarily disabling Mcafee VirusScan Enterprise, to no avail. According to http://www.yougetsignal.com/tools/open-ports/, both ports 80 and 3690 are still blocked. I can't think of what would be blocking them if Windows Firewall and my antivirus are disabled. Here is the output of netsh firewall show state Firewall status: ------------------------------------------------------------------- Profile = Standard Operational mode = Disable Exception mode = Enable Multicast/broadcast response mode = Enable Notification mode = Enable Group policy version = Windows Firewall Remote admin mode = Disable Ports currently open on all network interfaces: Port Protocol Version Program ------------------------------------------------------------------- 3690 TCP Any (null) 22 TCP Any (null) 80 TCP Any (null) 1900 UDP Any (null) 2869 TCP Any (null) Any help? I'm not sure what each item on the list of enabled/disabled items is, but "Operational Mode" is disabled, so I assume that one refers to me disabling Windows Firewall. I know that since Windows Firewall is off, this output might not be useful, but I figured I'd include it just in case, haha.

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