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• How to configure wireless in gentoo?

  - by Absolute0

  I have a single access point which i want to connect to on interface ra0, when I run /etc/init.d/ra0 restart I get the following output: gentoo ~ # /etc/init.d/net.ra0 restart * Starting ra0 * Configuring wireless network for ra0 Error for wireless request "Set Mode" (8B06) : SET failed on device ra0 ; Network is down. * ra0 does not support setting the mode to "managed" Error for wireless request "Set Encode" (8B2A) : SET failed on device ra0 ; Network is down. * ra0 does not support setting keys * or the parameter "mac_key_roswell" or "key_roswell" is incorrect Error for wireless request "Set Mode" (8B06) : SET failed on device ra0 ; Network is down. * ra0 does not support setting the mode to "managed" * WEP key is not set for "BAY_WiFi" - not connecting * Couldn't associate with any access points on ra0 * Failed to configure wireless for ra0 when I run iwlist ra0 scan I get "roswell" and "bay-wifi" I want to connect to only roswell. Here is my /etc/conf.d/net: modules= ( "iwconfig" ) key_roswell="ffff-ffff-ff" # no s: means a hex key preferred_aps=( "roswell" ) what am i doing wrong?

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• Looking for USB Network Attached Storage (NAS) Adapter that supports multiple drives, NTFS/FAT32 fil

  - by braveterry

  I'm looking for a NAS Adapter that supports attaching multiple USB devices to the network. Here's what I'd like to see in a NAS adapter: Under $100.00. Support for multiple devices. This can be through a USB hub or through multiple USB connectors on the device itself. Bittorrent support would be nice, but this isn't a deal-breaker. Filesystem support for at least NTFS or FAT32. I'd prefer to not have to reformat to use the device, but this is also not a deal-breaker. Here is what I am NOT looking for: I'm NOT looking for a NAS enclosure. I already have a couple of spare external USB drives that I'd like to use. I'm NOT looking for a networked USB hub like the one mentioned here. Network USB hubs only allow access to a drive from one PC at a time. I'm NOT looking for a wireless router with a NAS built in. I already have a wireless router, and I'd rather not go through the hassle of replacing it if possible. What I've looked at so far PogoPlug: This supports multiple devices via a USB hub, but there's not Bittorrent support. It's $99.00, so I may end up going with this and hope that they patch in Bittorrent support later. Addonics NAS Adapter: This supports only one device per adapter, so it's a non-starter. SimpleNET NAS Head USB 2.0 Portable Dongle: I'm not 100% sure this supports multiple devices. Plus there doesn't seem to be any Bittorrent support. I'll try to update this post as I explore other devices.

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• Disable Ethernet permanently to speed up boot time

  - by Anwar Shah

  I do not use the wired Ethernet Card. It seems to me that, Ubuntu is always trying in boot time to check the network via eth0, Which consumes some times and I guess this may slow down the boot process a bit. My dmesg output is below (partial) 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 1.985592] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:01/input/input5 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 1.985651] ACPI: Video Device [GFX0] (multi-head: yes rom: no post: no) 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 1.985693] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 2.056261] firewire_core: created device fw0: GUID 00023f87af41fd7d, S400 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 3.710435] EXT4-fs (sda9): mounted filesystem with ordered data mode. Opts: (null) A big time here..... 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 13.466642] ADDRCONF(NETDEV_UP): eth0: link is not ready 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 14.125296] Adding 1050620k swap on /dev/sda6. Priority:-1 extents:1 across:1050620k 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 14.226952] EXT4-fs (sda9): re-mounted. Opts: (null) 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 14.335012] snd_hda_intel 0000:00:1b.0: PCI INT A - GSI 22 (level, low) - IRQ 22 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 14.335091] snd_hda_intel 0000:00:1b.0: irq 45 for MSI/MSI-X 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 14.335128] snd_hda_intel 0000:00:1b.0: setting latency timer to 64 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 14.346410] input: Ideapad extra buttons as /devices/platform/ideapad/input/input6 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 14.428551] input: HDA Intel Headphone as /devices/pci0000:00/0000:00:1b.0/sound/card0/input7 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 14.436958] cfg80211: Calling CRDA to update world regulatory domain 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 14.476550] Linux video capture interface: v2.00 2012-06-11 23:06:47 Ubuntu-KDE kernel [ 14.486385] uvcvideo: Found UVC 1.00 device USB 2.0 Camera (04f2:b008) So, My question is How can I disable the Ethernet card completely, so that kernel will not try to use that?

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• mount network drive

  - by CaptnLenz

  since i updated my ubuntu to natty narwhal(from 10.04), my mount script doesn't work anymore. The scripts mounts a folder from a NAS (WD mybookworld) in the local network to a folder in my home folder. script looked like that: #!/bin/bash sudo mount //192.168.2.222/Public/Shared\ Music/ /home/simon/Musik/ error: mount: wrong fs type, bad option, bad superblock on //192.168.2.222/Public/Shared Music/, missing codepage or helper program, or other error (for several filesystems (e.g. nfs, cifs) you might need a /sbin/mount.<type> helper program) Manchmal liefert das Syslog wertvolle Informationen – versuchen Sie dmesg | tail oder so now, because the script doesn't work anymore i decided to add the mount-process to my fstab, because the network drive should be mounted on every startup. My fstab entry looks like this: //192.168.2.222/Public/Shared\ Music/ /home/simon/Musik cifs credentials=/home/simon/.smbcredentials 0 0 But it doesn't work, too. I get a message during the startup process, that Musik couldn't be mounted. Are there any log files i can check for errors? The system is a fresh installed 11.04. Greetings

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• Designing a social network with CQRS, graph databases and relational databases in mind

  - by Siraj Mansour

  I have done quite an amount of research on the topic so far, but i couldn't come up with a conclusion to make up my mind. I am designing a social network and during my research i stumbled upon graph databases, i found neo4j pretty interesting for user relations and traversing through nodes. I also thought of using a relational database such as MS-SQL or MySQL to store entity data only and depending on neo4j for connections between entities. Of course this means more work in my application to store and pull data in and out of 2 different sources. My first question : Is using this approach (graph + relational) a good approach for designing my social network keeping in mind that users on social networks don't have to in synch with real data by split second ? What are the positives and negatives of this approach ? My Second question : I've been doing some reading on CQRS and as i understood it is mostly useful for collaborative environments, and environments where users see a lot of "stale" data. social networks has shared comments, events, etc .. and many users query or update the same data. Could CQRS be a helpful approach ? Would it give any performance/scalability benefits or non-useful complexity ? Is it fairly applicable with my possible choice of (graph + relational) databases approach mentioned in the question above ? My purpose is to know if the approaches i have mentioned above seem good enough for the business context.

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• Layer 2 topology discovery

  - by pegah s

  I have been given a network (it is a LAN) comprised of switches and I need to discover the topology of that. (There may be Link Aggregation Groups (LAGs) in the network as well.) I have done a lot of search on layer 2 topology discovery and I have seen many articles talking about using SNMP MIBs or LLDP (I do not know which one is better or more practical, but all devices in my network support SNMP). But my problem is that I cannot find "the software to install and run" to actually see the topology map. I would really appreciate if someone could send me the website where I can download the code and use it. I have also found a lot of tools available online such as OpenNMS, Nagios, The Dude, LANsurveyor, SNMPwalk, and many more... But I cannot figure out which one is the best to pick. To summarize: what is the easiest simplest way to discover the layer 2 network topology?

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• Windows 7 "Backup completed but some files were skipped"

  - by Andrew Coleson

  I set up Windows 7 Pro to backup my files to a network path (woohoo!) and chose to backup "data for newly created users, libraries", and my user folder (no system image). All went fine (although the first backup took ~12 hours for some ridiculous reason), but at the end it gave me a message that "Your backup completed, but some files were skipped. Click to see which files." I checked and the "files" skipped were my 3 network-mapped drives, which is perfectly fine and reasonable behavior (I certainly don't need it to back up my network-mapped drives as part of my local PC backup), but in the Backup and Restore center it warns me that my Last backup was "Never" and the Action Center now has a permanent "Check your backup results" issue. Is there any way to set up the backup to exclude the network-mapped drives or tell it that I really don't mind that it skipped drives I never asked it to back up?

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• Hardening network with sysctl settings made Wi-fi downloading speed extremely slow

  - by Rohit Bansal

  I just followed up following steps to harden network security The /etc/sysctl.conf file contain all the sysctl settings. Prevent source routing of incoming packets and log malformed IP's enter the following in a terminal window: sudo vi /etc/sysctl.conf Edit the `/etc/sysctl.conf` file and un-comment or add the following lines : # IP Spoofing protection net.ipv4.conf.all.rp_filter = 1 net.ipv4.conf.default.rp_filter = 1 # Ignore ICMP broadcast requests net.ipv4.icmp_echo_ignore_broadcasts = 1 # Disable source packet routing net.ipv4.conf.all.accept_source_route = 0 net.ipv6.conf.all.accept_source_route = 0 net.ipv4.conf.default.accept_source_route = 0 net.ipv6.conf.default.accept_source_route = 0 # Ignore send redirects net.ipv4.conf.all.send_redirects = 0 net.ipv4.conf.default.send_redirects = 0 # Block SYN attacks net.ipv4.tcp_syncookies = 1 net.ipv4.tcp_max_syn_backlog = 2048 net.ipv4.tcp_synack_retries = 2 net.ipv4.tcp_syn_retries = 5 # Log Martians net.ipv4.conf.all.log_martians = 1 net.ipv4.icmp_ignore_bogus_error_responses = 1 # Ignore ICMP redirects net.ipv4.conf.all.accept_redirects = 0 net.ipv6.conf.all.accept_redirects = 0 net.ipv4.conf.default.accept_redirects = 0 net.ipv6.conf.default.accept_redirects = 0 # Ignore Directed pings net.ipv4.icmp_echo_ignore_all = 1 To reload sysctl with the latest changes, enter: sudo sysctl -p But, after applying the changes I found "Wi-fi" downloading speed and terminal downloading speed extremely slow (less than 1KB/s) however surfing speed through browser was good. But, using direct ethernet cable was giving a good speed. Then, I reverted back the above changes and things fall back in line once again.... Could you please let me know what possibly in above script is affecting such behaviour [and why] ? How could I still maintain hardening of network security without disturbing Wi-fi downloading speed ?

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• How can access files on shared drive from Windows 2008 server configured with SFTP

  - by communicator

  I have installed OpenSSH on my windows 2008 server by following the user guide here . Now I have some files on windows network share with UNC path as \\corp\test\testdata I want map this file system on network share to my windows 2008 server which is configred with SFTP so that I can access these files from my Java Program by doing SFTP to windows 2008 server.Is there anyway I can map the network share to C or other drive in server so that all the files on the share will be available as local files on the server?

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• Using VLANs that are routed together?

  - by dannymcc

  I have a quick question that's bugging me the more I read about VLANs. So far I understand that they are useful for dividing the network into sub-sections, but if you route them together does that not remove any security benefit? As an example, if I created a VLAN on my home network which was simply one computer, one server and one router.if I wanted to divide the network between computers and servers I could put the computer on VLAN 10 and the server on VLAN 20. Then the computer would no longer be able to communicate with the server - unless I added a static route to the router that connected the two together, basically telling VLAN 10 that VLAN 20 exists and how to communicate with it. The VLANs would then be connected in a similar way to a 'flat' network that has no VLANs. Therefore, surely, all security benefits are lost. Am I missing something?

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• Can't access to Ubuntu Shared Folder from Windows XP

  - by See hyung Lee

  I've set up a Ubuntu Shared Folder for around 70 users. They all use XP and most of them can access to the folder. Only few encounter some error message when they try to access to it. is not accessible. you might not have permission to use this network resource the network is not present or not started All 70 users same version of XP and in 192.168.1.0 /24 network. What'd be the problem?

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• Is there an equivalent command for 'init.d/networking restart' in OS X

  - by l0c0b0x

  From time to time, I've encountered issues with OS X clients' network connections (Wired and Wireless, Leopard/Snow Leopard) where nothing will fix the issue, until you reboot. Is there a particular 'network service/process' I should be watching out for? I was thinking it would be useful to know of a command that will reset a 'network connection' type service/process (same as running a sudo /etc/init.d/networking restart). Thanks!

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• Getting my brother MFC-J825DW working as a network scanner

  - by AntonChanning

  I've been attempting to set up my new brother multi-function device to work as a printer and scanner using the following steps. It is connected to the network as a LAN device, not directly connected to my ubuntu machine. Downloaded the lpr driver and cupswrapper driver from Brother support. (Select the deb packages, not the rpms). Followed the instructions to install the lpr driver. Followed the instructions to install the cupswrapper driver. After this point I was able to successfully perform a test print, so the printer part is working. So far I haven't had much luck getting the scanner working. This is what I've tried: Downloaded the brscan4 and scan-key-tool deb packages from brother support. Followed the instructions for installing the scanner driver for network. Followed the instructions for installing scan-key-tool. However when I tried to scan it detects no scanner. I then tried the solution offered in this answer to a question based on a similar brother printer, but no luck. I must have made a mistake somewhere along the line. Does anyone have any ideas what I can try to find out what? Or should I uninstall everything and start again from the beginning?

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• How have multiple web servers and IPs on the same physical network

  - by jsigned

  I do web development out of a small office and need to have multiple physical and virtual servers that can be accessed from the internet. I also have a number of devices (computers, laptops, tablets, printers, etc) that need connections as well. I have gotten a subnet of 8 IP's from my ISP and while that is adequate for the web servers its far too small for everything that needs access to the network. My router is an ASUS RT-N16 running DD-WRT. I'm just smart enough about this routing topic to be dangerous, think 2 year old with a magic marker. I would like to keep my internal network NAT'ed on the 192.168.x.x network and route the 68.69.x.x 255.255.255.248 traffic directly to the servers. The physical network consists of the 4 port DD-WRT router and an unmanaged gig switch. I have a fiber connection to the office that works as an Ethernet port. In other words I can plug my laptop directly into it and have access to the internet. There is no login or password and the router is setup to get DHCP from the ISP, and to provide DHCP addresses for the internal network. What I've done so far is google and try different configurations with little success. In the end I decided I didn't even know how to ask the questions needed. My questions are: Is this the best way to configure the network? How do you do it? VLANs? Multiple routers? I've never had to configure a router using anything more than the GUI so if this is command line stuff be gentle.

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• Why do Linux networks use Samba?

  - by Dougal

  The "file and printer sharing" feature of Linux distros is mostly Samba. Samba is an interpretation of Microsoft's network filesystem. Cross-OS compatibility is important of course but why are Linux systems defaulting to this Microsoft technology? Is Microsoft's network filesystem so good? Samba clearly works very well and I'm not "dissing" it. Or, to rephrase the question, "What would be a Linux-native way to share files and printers across a network?"

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• Getting mybrother MFC-J825DW working as a network scanner

  - by AntonChanning

  I've been attempting to set up my new brother multi-function device to work as a printer and scanner using the following steps. It is connected to the network as a LAN device, not directly connected to my ubuntu machine. Downloaded the lpr driver and cupswrapper driver from Brother support. (Select the deb packages, not the rpms). Followed the instructions to install the lpr driver. Followed the instructions to install the cupswrapper driver. After this point I was able to successfully perform a test print, so the printer part is working. So far I haven't had much luck getting the scanner working. This is what I've tried: Downloaded the brscan4 and scan-key-tool deb packages from brother support. Followed the instructions for installing the scanner driver for network. Followed the instructions for installing scan-key-tool. However when I tried to scan it detects no scanner. I then tried the solution offered in this answer to a question based on a similar brother printer, but no luck. I must have made a mistake somewhere along the line. Does anyone have any ideas what I can try to find out what? Or should I uninstall everything and start again from the beginning?

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• Wireless shows up as disabled, how can I get it working?

  - by Lazer

  $ sudo iwconfig lo no wireless extensions. eth0 no wireless extensions. wlan0 IEEE 802.11bg ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off pan0 no wireless extensions. $ This is what pops up when I click the two computers icon What should I do to get Wifi working on this machine? $ sudo ifconfig wlan0 up SIOCSIFFLAGS: No such file or directory $ $ lspci | tail 00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03) 00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03) 00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93) 00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03) 00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03) 00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03) 01:00.0 VGA compatible controller: ATI Technologies Inc M92 LP [Mobility Radeon HD 4300 Series] 09:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller (rev 13) 0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g (rev 01) $

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• Wireless shows up as disabled, how can I get it working?

  - by Lazer

  $ sudo iwconfig lo no wireless extensions. eth0 no wireless extensions. wlan0 IEEE 802.11bg ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off pan0 no wireless extensions. $ This is what pops up when I click the two computers icon What should I do to get Wifi working on this machine? $ sudo ifconfig wlan0 up SIOCSIFFLAGS: No such file or directory $ $ lspci | tail 00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03) 00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03) 00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03) 00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93) 00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03) 00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03) 00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03) 01:00.0 VGA compatible controller: ATI Technologies Inc M92 LP [Mobility Radeon HD 4300 Series] 09:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller (rev 13) 0c:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g (rev 01) $

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• Pluscom MAC address shows up but "wireless unavailable"

  - by Luigi

  I've got a pluscom pci card plugged into my desktop and although the mac address shows up in network manager, it says "Wireless unavailable". I'm using Ubuntu 12.10 Gnome Shell Remix... edgar@edgarQuantal:~$ iwconfig eth0 no wireless extensions. lo no wireless extensions. wlan0 IEEE 802.11bg ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off edgar@edgarQuantal:~$ ifconfig eth0 Link encap:Ethernet HWaddr 6c:f0:49:02:1f:b8 inet addr:192.168.0.7 Bcast:192.168.0.255 Mask:255.255.255.0 inet6 addr: fe80::6ef0:49ff:fe02:1fb8/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:1425 errors:0 dropped:0 overruns:0 frame:0 TX packets:1393 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:995753 (995.7 KB) TX bytes:134079 (134.0 KB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1/128 Scope:Host UP LOOPBACK RUNNING MTU:16436 Metric:1 RX packets:363 errors:0 dropped:0 overruns:0 frame:0 TX packets:363 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:40828 (40.8 KB) TX bytes:40828 (40.8 KB) It looks the same as the problem as here, seems quite complicated: http://ubuntuforums.org/showthread.php?t=1993226 Tried downloading the driver but i get this: "Unpacking firmware-ralink (from .../firmware-ralink_0.36_all.deb) ... dpkg: error processing /home/edgar/Downloads/firmware-ralink_0.36_all.deb (--install): trying to overwrite '/lib/firmware/rt2870.bin', which is also in package linux-firmware 1.95"

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• NetworkManager broken after upgrade to Kubuntu Saucy

  - by queueoverflow

  I had Kubuntu 13.04 on my ThinkPad X220, and I upgraded to 13.10 and I am not able to connect to a wired or wireless connection. The new network tray icon does not show any entries at all. In the menu of the tray icon, there is an error saying: Require NetworkManager 0.9.8, found . I then tried the following: nmcli con ** (process:3695): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: Rejected send message, 3 matched rules; type="method_call", sender=":1.64" (uid=1000 pid=3695 comm="nmcli con ") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination="org.freedesktop.NetworkManager" (uid=0 pid=1116 comm="NetworkManager ") Error: nmcli (0.9.8.0) and NetworkManager (unknown) versions don't match. Force execution using --nocheck, but the results are unpredictable. nmcli dev ** (process:3700): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: Rejected send message, 3 matched rules; type="method_call", sender=":1.65" (uid=1000 pid=3700 comm="nmcli dev ") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination="org.freedesktop.NetworkManager" (uid=0 pid=1116 comm="NetworkManager ") Error: nmcli (0.9.8.0) and NetworkManager (unknown) versions don't match. Force execution using --nocheck, but the results are unpredictable. nm-tool ** (process:3705): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: Rejected send message, 3 matched rules; type="method_call", sender=":1.66" (uid=1000 pid=3705 comm="nm-tool ") interface="org.freedesktop.DBus.Properties" member="GetAll" error name="(unset)" requested_reply="0" destination="org.freedesktop.NetworkManager" (uid=0 pid=1116 comm="NetworkManager ") NetworkManager Tool State: unknown ** (process:3705): WARNING **: error: could not connect to NetworkManager Running those as root works, however. I was also able to run nmcli con up id DHCP which got my DHCP connection working and giving me internet access. That did not work using a Wifi connection though, and I do need those. How can I get networking back to work without a reinstall?

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• FreeBSD 8.1 unstable network connection

  - by frankcheong

  I have three FreeBSD 8.1 running on three different hardware and therefore consist of different network adapter as well (bce, bge and igb). I found that the network connection is kind of unstable which I have tried to scp some 10MB file and found that I cannot always get the files completed successfully. I have further checked with my network admin and he claim that the problem is being caused by the network driver which cannot support the load whereby he tried to ping using huge packet size (around 15k) and my server will drop packet consistently at a regular interval. I found that this statement may not be valid since the three server is using three different network drive and it would be quite impossible that the same problem is being caused by three different network adapter and thus different network driver. Since then I have tried to tune up the performance by playing around with the /etc/sysctl.conf figures with no luck. kern.ipc.somaxconn=1024 kern.ipc.shmall=3276800 kern.ipc.shmmax=1638400000 # Security net.inet.ip.redirect=0 net.inet.ip.sourceroute=0 net.inet.ip.accept_sourceroute=0 net.inet.icmp.maskrepl=0 net.inet.icmp.log_redirect=0 net.inet.icmp.drop_redirect=1 net.inet.tcp.drop_synfin=1 # Security net.inet.udp.blackhole=1 net.inet.tcp.blackhole=2 # Required by pf net.inet.ip.forwarding=1 #Network Performance Tuning kern.ipc.maxsockbuf=16777216 net.inet.tcp.rfc1323=1 net.inet.tcp.sendbuf_max=16777216 net.inet.tcp.recvbuf_max=16777216 # Setting specifically for 1 or even 10Gbps network net.local.stream.sendspace=262144 net.local.stream.recvspace=262144 net.inet.tcp.local_slowstart_flightsize=10 net.inet.tcp.nolocaltimewait=1 net.inet.tcp.mssdflt=1460 net.inet.tcp.sendbuf_auto=1 net.inet.tcp.sendbuf_inc=16384 net.inet.tcp.recvbuf_auto=1 net.inet.tcp.recvbuf_inc=524288 net.inet.tcp.sendspace=262144 net.inet.tcp.recvspace=262144 net.inet.udp.recvspace=262144 kern.ipc.maxsockbuf=16777216 kern.ipc.nmbclusters=32768 net.inet.tcp.delayed_ack=1 net.inet.tcp.delacktime=100 net.inet.tcp.slowstart_flightsize=179 net.inet.tcp.inflight.enable=1 net.inet.tcp.inflight.min=6144 # Reduce the cache size of slow start connection net.inet.tcp.hostcache.expire=1 Our network admin also claim that they see quite a lot of network up and down from their cisco switch log while I cannot find any up down message inside the dmesg. Have further checked the netstat -s but dont have concrete idea. tcp: 133695291 packets sent 39408539 data packets (3358837321 bytes) 61868 data packets (89472844 bytes) retransmitted 24 data packets unnecessarily retransmitted 0 resends initiated by MTU discovery 50756141 ack-only packets (2148 delayed) 0 URG only packets 0 window probe packets 4372385 window update packets 39781869 control packets 134898031 packets received 72339403 acks (for 3357601899 bytes) 190712 duplicate acks 0 acks for unsent data 59339201 packets (3647021974 bytes) received in-sequence 114 completely duplicate packets (135202 bytes) 27 old duplicate packets 0 packets with some dup. data (0 bytes duped) 42090 out-of-order packets (60817889 bytes) 0 packets (0 bytes) of data after window 0 window probes 3953896 window update packets 64181 packets received after close 0 discarded for bad checksums 0 discarded for bad header offset fields 0 discarded because packet too short 45192 discarded due to memory problems 19945391 connection requests 1323420 connection accepts 0 bad connection attempts 0 listen queue overflows 0 ignored RSTs in the windows 21133581 connections established (including accepts) 21268724 connections closed (including 32737 drops) 207874 connections updated cached RTT on close 207874 connections updated cached RTT variance on close 132439 connections updated cached ssthresh on close 42392 embryonic connections dropped 72339338 segments updated rtt (of 69477829 attempts) 390871 retransmit timeouts 0 connections dropped by rexmit timeout 0 persist timeouts 0 connections dropped by persist timeout 0 Connections (fin_wait_2) dropped because of timeout 13990 keepalive timeouts 2 keepalive probes sent 13988 connections dropped by keepalive 173044 correct ACK header predictions 36947371 correct data packet header predictions 1323420 syncache entries added 0 retransmitted 0 dupsyn 0 dropped 1323420 completed 0 bucket overflow 0 cache overflow 0 reset 0 stale 0 aborted 0 badack 0 unreach 0 zone failures 1323420 cookies sent 0 cookies received 1864 SACK recovery episodes 18005 segment rexmits in SACK recovery episodes 26066896 byte rexmits in SACK recovery episodes 147327 SACK options (SACK blocks) received 87473 SACK options (SACK blocks) sent 0 SACK scoreboard overflow 0 packets with ECN CE bit set 0 packets with ECN ECT(0) bit set 0 packets with ECN ECT(1) bit set 0 successful ECN handshakes 0 times ECN reduced the congestion window udp: 5141258 datagrams received 0 with incomplete header 0 with bad data length field 0 with bad checksum 1 with no checksum 0 dropped due to no socket 129616 broadcast/multicast datagrams undelivered 0 dropped due to full socket buffers 0 not for hashed pcb 5011642 delivered 5016050 datagrams output 0 times multicast source filter matched sctp: 0 input packets 0 datagrams 0 packets that had data 0 input SACK chunks 0 input DATA chunks 0 duplicate DATA chunks 0 input HB chunks 0 HB-ACK chunks 0 input ECNE chunks 0 input AUTH chunks 0 chunks missing AUTH 0 invalid HMAC ids received 0 invalid secret ids received 0 auth failed 0 fast path receives all one chunk 0 fast path multi-part data 0 output packets 0 output SACKs 0 output DATA chunks 0 retransmitted DATA chunks 0 fast retransmitted DATA chunks 0 FR's that happened more than once to same chunk 0 intput HB chunks 0 output ECNE chunks 0 output AUTH chunks 0 ip_output error counter Packet drop statistics: 0 from middle box 0 from end host 0 with data 0 non-data, non-endhost 0 non-endhost, bandwidth rep only 0 not enough for chunk header 0 not enough data to confirm 0 where process_chunk_drop said break 0 failed to find TSN 0 attempt reverse TSN lookup 0 e-host confirms zero-rwnd 0 midbox confirms no space 0 data did not match TSN 0 TSN's marked for Fast Retran Timeouts: 0 iterator timers fired 0 T3 data time outs 0 window probe (T3) timers fired 0 INIT timers fired 0 sack timers fired 0 shutdown timers fired 0 heartbeat timers fired 0 a cookie timeout fired 0 an endpoint changed its cookiesecret 0 PMTU timers fired 0 shutdown ack timers fired 0 shutdown guard timers fired 0 stream reset timers fired 0 early FR timers fired 0 an asconf timer fired 0 auto close timer fired 0 asoc free timers expired 0 inp free timers expired 0 packet shorter than header 0 checksum error 0 no endpoint for port 0 bad v-tag 0 bad SID 0 no memory 0 number of multiple FR in a RTT window 0 RFC813 allowed sending 0 RFC813 does not allow sending 0 times max burst prohibited sending 0 look ahead tells us no memory in interface 0 numbers of window probes sent 0 times an output error to clamp down on next user send 0 times sctp_senderrors were caused from a user 0 number of in data drops due to chunk limit reached 0 number of in data drops due to rwnd limit reached 0 times a ECN reduced the cwnd 0 used express lookup via vtag 0 collision in express lookup 0 times the sender ran dry of user data on primary 0 same for above 0 sacks the slow way 0 window update only sacks sent 0 sends with sinfo_flags !=0 0 unordered sends 0 sends with EOF flag set 0 sends with ABORT flag set 0 times protocol drain called 0 times we did a protocol drain 0 times recv was called with peek 0 cached chunks used 0 cached stream oq's used 0 unread messages abandonded by close 0 send burst avoidance, already max burst inflight to net 0 send cwnd full avoidance, already max burst inflight to net 0 number of map array over-runs via fwd-tsn's ip: 137814085 total packets received 0 bad header checksums 0 with size smaller than minimum 0 with data size < data length 0 with ip length > max ip packet size 0 with header length < data size 0 with data length < header length 0 with bad options 0 with incorrect version number 1200 fragments received 0 fragments dropped (dup or out of space) 0 fragments dropped after timeout 300 packets reassembled ok 137813009 packets for this host 530 packets for unknown/unsupported protocol 0 packets forwarded (0 packets fast forwarded) 61 packets not forwardable 0 packets received for unknown multicast group 0 redirects sent 137234598 packets sent from this host 0 packets sent with fabricated ip header 685307 output packets dropped due to no bufs, etc. 52 output packets discarded due to no route 300 output datagrams fragmented 1200 fragments created 0 datagrams that can't be fragmented 0 tunneling packets that can't find gif 0 datagrams with bad address in header icmp: 0 calls to icmp_error 0 errors not generated in response to an icmp message Output histogram: echo reply: 305 0 messages with bad code fields 0 messages less than the minimum length 0 messages with bad checksum 0 messages with bad length 0 multicast echo requests ignored 0 multicast timestamp requests ignored Input histogram: destination unreachable: 530 echo: 305 305 message responses generated 0 invalid return addresses 0 no return routes ICMP address mask responses are disabled igmp: 0 messages received 0 messages received with too few bytes 0 messages received with wrong TTL 0 messages received with bad checksum 0 V1/V2 membership queries received 0 V3 membership queries received 0 membership queries received with invalid field(s) 0 general queries received 0 group queries received 0 group-source queries received 0 group-source queries dropped 0 membership reports received 0 membership reports received with invalid field(s) 0 membership reports received for groups to which we belong 0 V3 reports received without Router Alert 0 membership reports sent arp: 376748 ARP requests sent 3207 ARP replies sent 245245 ARP requests received 80845 ARP replies received 326090 ARP packets received 267712 total packets dropped due to no ARP entry 108876 ARP entrys timed out 0 Duplicate IPs seen ip6: 2226633 total packets received 0 with size smaller than minimum 0 with data size < data length 0 with bad options 0 with incorrect version number 0 fragments received 0 fragments dropped (dup or out of space) 0 fragments dropped after timeout 0 fragments that exceeded limit 0 packets reassembled ok 2226633 packets for this host 0 packets forwarded 0 packets not forwardable 0 redirects sent 2226633 packets sent from this host 0 packets sent with fabricated ip header 0 output packets dropped due to no bufs, etc. 8 output packets discarded due to no route 0 output datagrams fragmented 0 fragments created 0 datagrams that can't be fragmented 0 packets that violated scope rules 0 multicast packets which we don't join Input histogram: UDP: 2226633 Mbuf statistics: 962679 one mbuf 1263954 one ext mbuf 0 two or more ext mbuf 0 packets whose headers are not continuous 0 tunneling packets that can't find gif 0 packets discarded because of too many headers 0 failures of source address selection Source addresses selection rule applied: icmp6: 0 calls to icmp6_error 0 errors not generated in response to an icmp6 message 0 errors not generated because of rate limitation 0 messages with bad code fields 0 messages < minimum length 0 bad checksums 0 messages with bad length Histogram of error messages to be generated: 0 no route 0 administratively prohibited 0 beyond scope 0 address unreachable 0 port unreachable 0 packet too big 0 time exceed transit 0 time exceed reassembly 0 erroneous header field 0 unrecognized next header 0 unrecognized option 0 redirect 0 unknown 0 message responses generated 0 messages with too many ND options 0 messages with bad ND options 0 bad neighbor solicitation messages 0 bad neighbor advertisement messages 0 bad router solicitation messages 0 bad router advertisement messages 0 bad redirect messages 0 path MTU changes rip6: 0 messages received 0 checksum calculations on inbound 0 messages with bad checksum 0 messages dropped due to no socket 0 multicast messages dropped due to no socket 0 messages dropped due to full socket buffers 0 delivered 0 datagrams output netstat -m 516/5124/5640 mbufs in use (current/cache/total) 512/1634/2146/32768 mbuf clusters in use (current/cache/total/max) 512/1536 mbuf+clusters out of packet secondary zone in use (current/cache) 0/1303/1303/12800 4k (page size) jumbo clusters in use (current/cache/total/max) 0/0/0/6400 9k jumbo clusters in use (current/cache/total/max) 0/0/0/3200 16k jumbo clusters in use (current/cache/total/max) 1153K/9761K/10914K bytes allocated to network (current/cache/total) 0/0/0 requests for mbufs denied (mbufs/clusters/mbuf+clusters) 0/0/0 requests for jumbo clusters denied (4k/9k/16k) 0/8/6656 sfbufs in use (current/peak/max) 0 requests for sfbufs denied 0 requests for sfbufs delayed 0 requests for I/O initiated by sendfile 0 calls to protocol drain routines Anyone got an idea what might be the possible cause?

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• Set up ad hoc wireless connection between Windows Vista and Mac OS X

  - by Skarab

  I have the following problem - Windows Vista does not connect to adhoc wireless network created on my Macbook. I have tried to create secured (with 40 bit key) and unsecured network but Windows Vista still has problems to connect. Windows VISTA informs me -- after 5 minutes of attempts - that setting up the connection -- with my adhoc network -- took too much time. My question: do I need to configure some settings on Vista to connect it to my Macbook? Maybe it is a problem with DHCP? Edited: I have tried the other way: http://superuser.com/questions/202890/set-up-an-adhoc-network-in-windows-vista-to-connect-to-and-share-the-internet-con

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• Windows PE network setup

  - by microchasm

  I'm walking through the following step-by-step guide for deploying Windows 7 via AIK: http://technet.microsoft.com/en-us/library/dd349348%28WS.10%29.aspx On step 4 (Capturing the Installation onto a Network Share), I run into a bit of a snag: attempting to connect to a network drive repeatedly fails. I'm using/deploying Dell Optiplex 380 64 bit machines, and the network cards seem to be really wonky. On the machine that I'm using to run AIK etc, the network driver wasn't found automatically. I had to manually go in and install the driver (which was found on the OEM installation media). I've since copied this to the USB key that I'm using for the Autounattend.xml so its handy. I think that because of this, the PE environment doesn't or can't instantiate the network device. Is there a way to install/configure the network device through the command prompt in PE? If not, I read about adding in the answer file path(s) to drivers, but if I did it this way, would I have to start the process all over again (i.e. create new Autounattend.xml with the PnPcustomizations path included, re-run the installation on the reference machine, install all the applications, re-make the PE iso, reboot into new PE iso)? Any shortcuts, direction, or advice would be appreciated. Thanks!

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• Install McAfee And Nod32

  - by hosseinsinohe

  Hi All I have a computer with windows XP service pack 3 as an operating system.This computer is in a network with McAfee update server.This server will install and update McAfee client in all computers in that network.When I install and running 'Eset Nod32 Smart Security (AntiVirus)',computer is getting hanged. (Not works in Safe Mode). How can I install both Nod32 and McAfee on this network ?

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• What's the best solution for file sharing in my case? DAS or NAS?

  - by jakub

  I want to have in my network small, cheap and energy efficient server with will be fully customizable (Gnu/Linux, OpenBSD). What is more I want to have big, redundant storage in my network and access to it via server. I have already small terminal without hard drive (no SATA/PATA, one drive on USB) which works fine. I don't want to buy big server, or to use regular computer for that. It's not cheap. I thought about a small case (ITX?), and cheap computer in this with SATA ports, but I cannot find anything interesting :( I thought about NAS in network and server independently and booting server from NAS, I'm not sure which technologies will be good for that, and I don't know what with performance. Direct connection to NAS through network from workstation is next pro for that. What do you think about DAS? It will be good for that?

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