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• wrt54gl reboots; troubleshooting steps?

  - by Bill

  I am using about 10 wrt54gl's in a small school. I am using a combination of stock firmware and Tomato 1.25, slowly moving towards all Tomato. We have had these devices installed for several years without problems. Recently, more and more of the units have started to spontaneously reboot, usually during high-traffic times (but not always). For the most part, the rebooting is not critical for us, but the wrt54gl's temporarily revert to 192.168.1.1 on the LAN ethernet ports and conflict with a critical server that's already installed with that IP. (Yes -- we plan to move the server off that address, but it is an involved process.) Both Tomato and the stock firmware (several versions from recent to several years old) exhibit the same problem: random reboots and reverting to 192.168.1.1 and conflicting temporarily with our server until the firmware boot process finishes. Here are my questions: Any way to prevent the wrt54gl's from reverting to 192.168.1.1 during the boot process? I was thinking of doing a custom firmware mod, although I hate to go that direction. Any steps to take in troubleshooting the reboots? Only some of the wrt54gl's reboot, which is odd. Others stay online for weeks and months without issues. Thanks.

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• Terse, documented, correct way to create Kerberos-backed user shares in Greyhole

  - by MrGomez

  As a migration strategy away from Windows Home Server (which is currently out of support and intractable for our needs, for a variety of reasons), our little cloister of nerds has targeted Greyhole for our shared use at home. Despite the documentation's terseness, getting the system set up for simple, single-user operation isn't especially difficult, but this scenario fails to service our needs. Among other highlights of the system, we're attempting to emulate Integrated Windows Authentication (with Kerberos) and single-user shares to keep the Windows users in the house happy and well-supported. I'm aware of the underlying systems that go into Greyhole and understand how to set up per-user shares in Samba, but the documentation doesn't seem to support cases for Greyhole to sop up these directories as separate landing zones for replication. Enter my question: are both of these cases (IWA user authentication and user-partitioned personal shares) supported by Greyhole? If so, please cite or link the supporting documentation if it exists.

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• Bonjour/DNS Service Discovery queries

  - by senloe

  I'm trying to implement dns service discovery in my application (no, I'm not asking for a programmatic answer). What I believe is one of my big pain points is generating the query. I know I need to send out a multicast broadcast on port 5353 and want to look for devices of type _ipp._tcp and _print._tcp, but I don't know what the question section needs to look like. For example, in SSDP I sent out a query that looks like the following: "M-SEARCH * HTTP/1.1\r\n" "HOST: 239.255.255.250:1900\r\n" + "MAN: \"ssdp:discover\"\r\n" "ST: urn:schemas-upnp-org:device:Printer:1\r\n" "MX: 5000\r\n\r\n" From what I know about a DNS query I need to send something like: "_ipp.tcp,all,all" but I know there needs to be more. Any pointers to documentation, etc would be greatly appreciated! update rfc1035 appears to contain promising information re the message structure.

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• Can software traffic generator generate 100 Mbps traffic ?

  - by user26202

  Hello , Can software traffic generators like iperf etc can generate 100mbps traffic? else is there any software generators which can produce such high rates ? Regards, Mithun

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• ProCurve network expansion

  - by Blue Warrior NFB

  I've hit a bit of a wall with our network scale-out. As it stands right now: We have five ProCurve 2910al switches connected as above, but with 10GbE connections (two CX4, two fiber). This fully populates the central switch above, there will be no more 10GbE Ethernet connections from that device. This group of switches is not stacked (no stack directive). Sometime in the next two or three months I'll need to add a sixth, and I'm not sure how deep of a hole I'm in. Ideally I'd replace the core switch with something more capable and has more 10GbE ports. However, that's a major outage and that requires special scheduling. The two edge switches connected via fiber have dual-port 10GbE cards in them, so I could physically put another switch on the far end of one of those. I don't know how much of a good or bad idea that would be though. Is that too many segments between end-points? Some config-excerpts: Running configuration: ; J9147A Configuration Editor; Created on release #W.14.49 hostname "REDACTED-SW01" time timezone 120 module 1 type J9147A module 2 type J9008A module 3 type J9149A no stack trunk B1 Trk3 Trunk trunk B2 Trk4 Trunk trunk A1 Trk11 Trunk trunk A2 Trk12 Trunk vlan 15 name "VM-MGMT" untagged Trk2,Trk5,Trk7 ip helper-address 10.1.10.4 ip address 10.1.11.1 255.255.255.0 tagged 37-40,Trk3-Trk4,Trk11-Trk12 jumbo ip proxy-arp exit

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

  - by nikku

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

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• Identical traffic

  - by Walter White

  Hi all, I am running an application server and logging all requests for analysis purposes later. One interesting trend I noticed last night was, I had a visitor from Texas on FIOS share identical traffic with bluecoat in California. What would cause the traffic to be identical? For every request the visitor made, bluecoat made one subsequently within milliseconds of his request. If it is caching, why would there be identical requests? Wouldn't it go through the cache / proxy on their end, and I would only see the proxied request? I'm just curious, this is an interesting pattern that shows similarities of a DDoS attack, but with far fewer resources. Is it possible that the visitor had malware on their computer? Any other ideas? Walter

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• few question about linux [closed]

  - by oneat

  Can I execute assembly files with all privileges (using ports)? Does the newest DSL (damn small Linux) works with winXP. (makes bootloader for it) And does it support downloading applications automatically ?

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• Error 53 - The network path was not found.

  - by Jack

  I have a machine in my Active Directory Domain that I can no longer "net view" from other machines in the domain. This is a Windows XP Pro machine. It is hosting a VMWare virtual of my Domain Controller. If I attempt to net view [machine name] I get system error 53, The network path was not found. This is not a DNS issue, the same thing happens with the machine's IP. I don't think it's a firewall issue, I turned the firewall off on this machine. As I mentioned, it has worked in the past, and then stopped for no reason that I can see. I (intentionally) didn't change the software. I CAN get to the VMs hosted on this machine, can connect to their shares, net view them, etc. All other machines can see each other. In fact, the problem machine can see other machines and access their shares just fine. I tried removing the machine from the domain and re-adding it. I tried deleting the shares and recreating them. Not sure how to troubleshoot this any further. Any ideas?

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• Bridged network on OS X only gets UDP broadcast traffic

  - by a paid nerd

  I've created a bridged network Mac OS X 10.8.5 using ifconfig and TUNTAP for OS X to bridge my wireless connection, en0, with a virtual interface, tap0, which I can use for guest VMs: $ sudo sysctl -w net.inet.ip.forwarding=1 $ sudo sysctl -w net.link.ether.inet.proxyall=1 $ sudo sysctl -w net.inet.ip.fw.enable=1 $ sudo ifconfig bridge0 create $ sudo ifconfig bridge0 addm en0 addm tap0 $ sudo ifconfig bridge0 up $ ifconfig en0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether 28:cf:xx:xx:xx:xx inet6 xxxx::xxxx:xxxx:xxxx:xxxx%en0 prefixlen 64 scopeid 0x4 inet 192.168.100.64 netmask 0xffffff00 broadcast 192.168.100.1 media: autoselect status: active bridge0: flags=8863<UP,BROADCAST,SMART,RUNNING,SIMPLEX,MULTICAST> mtu 1500 ether ac:de:xx:xx:xx:xx Configuration: priority 0 hellotime 0 fwddelay 0 maxage 0 ipfilter disabled flags 0x2 member: en0 flags=3<LEARNING,DISCOVER> port 4 priority 0 path cost 0 member: tap0 flags=3<LEARNING,DISCOVER> port 8 priority 0 path cost 0 tap0: flags=8943<UP,BROADCAST,RUNNING,PROMISC,SIMPLEX,MULTICAST> mtu 1500 ether ca:3d:xx:xx:xx:xx open (pid 88244) However, if I tcpdump -i tap0, I only see broadcast traffic. Shouldn't I see a mirror of everything on en0? (192.168.100.33, the host doing the broadcasting, is another unrelate, noisy server on my LAN.) (I asked a similar question here and will probably close it.)

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• Powering Future Systems Innovations: Challenges and Opportunities

  Wen-Hann Wang discusses research challenges in system-level development Business - Level - Schools - Environment - Health

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• default gateway and tracert

  - by chappar

  when i do "route print" on my machine, it shows my default gateway as 10.225.150.1 but when i do tracert www.google.com, the first machine it reaches is 10.225.150.2. The route command does not show any entry for 10.225.150.2. So, why tracert is showing 10.225.150.2? my maching is on Windows XP.

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• UTP cable for telephone line possible?

  - by Chris

  Hi, One of my customers has build a new house with pre-installed cables for internet. The only thing he didn't think about was installing a cable for his telephone line. Behind his desk, he has a "spare" UTP cable, my question. Can this cable be used to replace a telephone line. This client has a internet and telephony contract, using a experiabox phone/internet modem. Any help would be great. I knowe I have to use a RJ11 plug.

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• Linux does not communicate to Windows subinterface

  - by artaxerxe

  I set my NIC on Windows so that I have two interfaces: one (the first one) has IP 192.168.0.5 the other one has IP 10.10.10.1. On a Linux machine I set an interface to 10.10.10.2. On another Linux machine I set the interface to 10.10.10.3. And tried to ping those machines. Here is the result. Linux to Linux is ok. Windows to Linux also is ok. But Linux to Windows does not work. Can you help me on getting the communication between Linux and Windows? What should I do for this? I have to mention that those machines are connected through a switch. If you need any details, ask me please! Thanks in advance!

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• TP-Link storage server accessing from Mac OS

  - by coure2011

  I have a storage/print server by TP-Link http://www.tp-link.com/en/products/details/?categoryid=232&model=TL-PS310U I just connect usb-storage to the print server and on windows I can access that usb-device from my windows computers. But how can I access that device from Mac? I found an article that I can add usb printer to mac using that device but not able to find how to access the storage device. please help me out!

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• How to access Guest (Linux) Filesystem from Host (Windows) in VirtualBox

  - by Dominic Barnes

  I am trying to synchronize my music between my desktop (Ubuntu 9.10) and my laptop (VirtualBox: Windows 7 host & Ubuntu 9.10 guest) I use Unison to perform the actual sync, which itself is not the problem. I am ultimately trying to get my Windows 7 host to be able to access the music files so I can sync my iPod Touch. What I need to figure out is how I can that to work. I would prefer to actually perform the sync to my Ubuntu Guest, mostly because of the filename allowed character differences between Windows and Linux. Is there a way to access the files on my Linux Guest from the Windows Host? Can I mount the VDI in Windows when VirtualBox is off? Can I have Windows Host access the Linux Guest filesystem while VirtualBox is running?

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• Windows Server 2003 R2 Standard: Locks MS Office files, but not Adobe .AI and .PSD files?

  - by Bruce Garlock

  We have some shares setup on a Windows 2003 R2 server, and the MS Office files people save behave properly: The first person to open the file gets read/write, and the second person to open the file while the first person still has the file open, gets a read-only version. This is not true for the graphics files, like Adobe Illustrator .AI files, and Photoshop .PSD files. Anyone who goes to open these files has full read/write, even if someone else is already working on the file! This has lead to numerous file corruption issues, as well as other lost work, since it always saves the last changes to the file. How do we get Windows to properly lock these files so when someone is working on a file, and someone else wants to open one, they get read-only access? Many thanks, Bruce

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• Why do my Taskbar icons disappear after a reboot

  - by cruz

  W7 Pro 64 bit is networked and configured the reg key %USERPROFILE%\Desktop as [driveletter]:\Desktop. After a power off\power on, it shows all my Desktop icons & Taskbar pinned icons.

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• Is there a small business router that shows bandwidth usage graphs in the admin panel?

  - by Robert Drake

  I support a large number of public libraries that are having their networks upgraded in response to a grant application. These libraries are generally home to between 6-15 computers and have little or no tech services either onsite or contracted remotely. In order to justify current and future purchases, a number of the libraries have requested routers that can provide bandwidth usage graphs that they can show to their managing boards. Is there a small business router that displays traffic graphs in the router administration web interface? The router needs to suppport DHCP and basic firewalling. No other features are required. Further, the reports just need to show overall trends. It is not necessary to show traffic by IP, by protocol/application, or by time of day. They just need an overall week to week, month to month, trend line. I'm familiar with MRTG/PRTG/tools that collect SNMP data from the router, but the libraries don't have the expertise for the configuration. I've considered installing the tomato firmware on some cheap home/home office routers, but if there's a commercial product that can be purchased that would be significantly simpler. Also the library boards would be much more likely to approve the purchase of a commercial product over a 'hacked' one. Any assistance would be appreciated.

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• DHCP over WiFi on CentOS 6 [closed]

  - by dongle26

  Using CentOS 6 I cannot get my WiFi interface to configure over DHCP. Here is my ifcfg-wlan0: This does not work (although it is correct): DEVICE=wlan0 BOOTPROTO=dhcp ONBOOT=yes HWADDR=xx:xx:xx:xx:xx:xx TYPE=Wireless This works: DEVICE=wlan0 BOOTPROTO=none ONBOOT=yes IPADDR=192.168.0.253 NETMASK=255.255.255.0 DNS1=192.168.0.99 GATEWAY=192.168.0.99 HWADDR=xx:xx:xx:xx:xx:xx TYPE=Wireless I don't want a static IP address, I want a DHCP assigned address. Update: Both of the above configs are correct. Please don't downvote, this really didn't work for me. It must be a bug in CentOS or my wireless driver. See my answer for details.

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• Copy windows shared file from cmd

  - by Bogdan Gusiev

  Is there a downloading tool that supports Windows Shared files and works from command line? Standard copy is getting hanged with no action on my side. Tried wget but seems it doesn't 'eat' the link.

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• fast way to find network user computer on domain hogging all wan bandwidth

  - by dasko

  i have a network of about 40 domain users and i have huge latency wan issues, like 1400ms for google.com pings. I have noticed that the problem goes away after everyone goes home for the day. I would like to know if i should use something like a hub with wireshark on the router or modem to see if there are any irregular activity. I am open to suggestions but i need to isolate which user has the bug. I am assuming it is either downloads or someone spamming out heavily and not knowing. It would be best to trace to ip number so i can just look into dns and find the pc hostname with the problem? This is the first client i have this problem with so never really needed to address it before but not suprised as users don't actually listen to any best practices that we have suggested. Please help, thanks. just to update, pc's to routers and other computers have ping latency of 1ms so it is right after i hit the wan, using tracert to a web site (random), that i get the massive delay in the responses. As well this is a dsl line with 5mb down and 650kb up (maybe upload saturation?) thanks.

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• setup mtu automatically after system reboot

  - by Gopalakrishnan Subramani

  I have issues with slow internet and by changing mtu works fine for me. I use Ubuntu 9.10 64bit system. I have dynamic ip address setup All the time after system bootup, I need to do the following command to make mtu setting take effect. sudo ifconfig eth0 mtu 1492 Are there any way I can set it up using startup program. As you know, sudo prompt me root password.

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• Headless VirtualBox VM NAT Network

  - by dirt

  I have a remote linux server accessible through SSH only. My goal is to host multiple Virtual Machines on this host server using VirtualBox. The host server has 1 IP address, so NAT will be used to route to the VMs for example 10022 will forward to server1:22 and 20022 will forward to server2:22. I have installed VirtualBox and copied a pre-configured CentOS VM to the host server. I start the VM, but cannot establish a connection to the server for example ssh -p 10022 127.0.0.1 times out. I've tried many things: Method 1: Copied existing .vdi, attached to new VM Method 2: Imported .Ova VM (thought it would help any MAC re-init issues?) NAT network type, tried natnet1 192.168/16 and 10.0/16 VBoxManage modifyvm "hermes.awoms.com" --natnet1 "192.168/16" Port forwarding with and without specifying VM ip in modifyvm --natpf1 command VBoxManage modifyvm "hermes" --natpf1 "guestssh,tcp,,10022,,,22" VBoxManage modifyvm "hermes" --natpf1 "guestssh,tcp,,10022,192.168.0.15,22" I can't see if VM is even booting (VBoxHeadless "hermes" --start & runs with no errors) I can't tell if VM is getting an IP address Is there anything else I can do to get more information from VirtualBox or the VM starting up when the only access I have is SSH?

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• Determine Users Accessing a Shared Folder Using PowerShell

  - by MagicAndi

  Hi, I need to determine the users/sessions accessing a shared folder on a Windows XP (SP2) machine using a PowerShell script (v 1.0). This is the information displayed using Computer Management | System Tools | Shared Folders | Sessions. Can anyone give me pointers on how to go about this? I'm guessing it will require a WMI query, but my initial search online didn't reveal what the query details will be. Thanks, MagicAndi

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