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• linux to linux, 10TB transfer?

  - by lostincode

  I've looked at all the previous similar questions, but the answers seemed to be all over the place and no one was moving a lot of data (100GB != 10TB). I've got about 10TB that I need to move from one raid to another, gigabit net, XFS file systems. My biggest concern is having the transfer die midway and not being able to resume easily. Speed would be nice, but ensuring transfer is much more important. Normally I'd just tar & netcat, but the raid I'm moving from has been super flaky as of late and I need to be able to recover and resume if it drops mid process. Should I be looking at rsync?

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• VPN Network intermittantly fails to provide internet: What could be possible causes

  - by Jake M

  We have a small office with our own VPN setup. We occasionally experience failures in our internet connection where we cannot access the internet. Most of the time the internet connection will resume by itself(without me doing anything) after a period of time(10 mins). Would you be able to suggest possible causes of the connection failure so I can then go and run some tests? Our network architecture is like so: A 'Billion' brand router that is connected to the internet via phone cable and then connected to our Cisco Switch A Cisco Switch/Bus which is connected to all our office nodes, our external harddrive and also to our router as stated above. All connections are via ethernet cable A series of work computers(nodes) connected via ethernet cable to the Cisco switch. Our ISP is TPG Australia We have a Virtual Private Network All the ethernet cables are about 3 years old Do you think that the causes of our intermittant connection problems could be due to the following: Data collisions in the ethernet cables Old/Faulty ethernet cables Our ISP has bad service Can you think of any other causes of the problem?

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• TCP/IP Ilustrated 1 second edition [on hold]

  - by user196821

  Well, I want to read and learn about how tcpip works in detail, so I got a copy of the well known book of Richard Stevens. But after a little, I discovered there is a second edition of the book, so I checked it out. But surprisingly, the second edition does not cover some subjects that the first actually does (like telnet, ftp, smtp etc...), so I thought "well I just have to read the misshing chapters on the first edition", but if they removed them in the second, it is for a reason. Is there really a good reason for that?

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• How do I send traffic to specific IP addresses through VPN and others directly to the internet?

  - by keithwarren7

  I am running Windows 7 and using the Cisco VPN adapter to connect to a private network where I access resources starting with the IP address 172.. My problem is that when connected to the VPN all external traffic is routed through the VPN. I want to set things up so only certain IP addresses go through the VPN and everything else goes out over the local adapter and out to the internet as normal. How?

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• Window 7 image in vmware will allow network connection out but not http

  - by Ormis

  I am currently trying to create a set of images to deploy on my network, but I've run in to a snag. When I create my own Windows 7 image I can successfully use NAT for connecting to the network but whenever I try to access a webpage I get nothing. To be more specific, All firewalls/iptables are disabled on my host machine, my virtual machine, and my network. I can do lookups and all addresses respond correctly (i'm even using Google's DNS). On the host OS i have full connectivity. On the virtual machine I can ping any device I want and all addresses resolve correctly. Within a browser I cannot reach any page via hostname or IP. I feel almost like port 80 is being blocked but i can't find any reason this would be the case. If anyone has had this occur before, I would love some insight to the problem. I understand this question is a bit out of the norm for stackoverflow, but I've run out of ideas. Thank you for any help you can provide.

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• Tool for Network game party

  - by nXqd

  I'm looking for tools for a network game party ( LAN ) .This is my first time I join as a tech-support for this party. I already know some tools like Desktop Sharing, Desktop lock . Anyone suggest more tools ? And links are appreciated :)

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• Latency in Sending and Receiving Files From Amazon EC2 - Justification

  - by Adroidist

  I am facing a huge delay while uploading and downloading files from my Windows Amazon EC2 server to my android device. It takes around 50 seconds to upload then download 500 Kbytes image. My location is in asia and the server is is US-East. I pinged the server from my android and obtained values around 500 ms for RTT. Is this normal? How is this explained? I tried this website: http://cloudharmony.com/speedtest/run and obtained that downloading 270 Kbytes file takes around 20 seconds. How is this delay justified?

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• Mysterious login attempts to windows server

  - by Jim Balo

  I have a Windows 2008R2 server that is reporting failed login attempts from a number of workstations on our network. Some event log details: Event ID 4625, Status: 0xc000006d, Sub Status: 0xc0000064 Security ID: NULL SID, Account Name: joedoe, Account Domain: Acme Workstation Name: WINXP1, Source Network Address: 192.168.1.23, Source Port: 1904 Logon Process: NtLmSsp, Authentication Package: NTLM, Logon Type: 3 (network) I believe this is coming from some netbios service or similar (maybe the file explorer), keeping an inventory of its network neighborhood and also trying to authenticate. Is there a way to turn this off without having to turn off file sharing all together? In other words, clients authenticating against file servers that they use is of course no problem, but I want to eliminate clients trying to authenticate to servers that they are not using and have no business with. The above example is only one of thousands of log alerts for similar failed network authentications. What can I do to clean this up / handle this? Thanks.

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• Remotely turn on a device that is powered off?

  - by njboot

  Verbatim from the interview between Brian Williams and Edward Snowden last night: Snowden: Any intelligence service in the world that has significant funding and a real technological research team can own that phone [refering to Williams' iPhone] as soon as it connects to a network; it can be theirs. Williams: Can anyone turn it on remotely if it's off? Snowden: They can absolutely turn it on with the power turned off on the device. I concede Snowden's first point, fine. But the last? Does Snowden's last claim, that a powered off mobile device can be remotely turned, have any merit? It seems highly improbable and seemingly impossible.

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• Finding all domain names that resolve to the same ip?

  - by Janak

  Lately I've been tracking a spammer on craigslist. I recently discovered that he's added a new technique to his arsenal, he registered a whole bunch of domain names but they all resolve to the same ip address. Is there any way to take an ip address and get a list of all the domain names that resolve to that ip?

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• Wireless Password

  - by Campo

  I have a security policy question: I want to know how other admins handle the WIFI password in the office. Does everyone know it? Do you enter it in for the user or guest every time and keep it a secret. I am in camp 2. Just want to know what others do and their reasoning behind it.

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• Remote connection IP to use

  - by petwho

  I have two laptops that both run on ubuntu and installed ssh server and ssh client on them. One is usually on my desk at home and one I usually bring to my company. When I'm at home I can easily ssh to one from the other by typing this command (to login to the other laptop whose IP address is: 192.168.0.105) : ssh -p 22 [email protected] However, When I'm at my company, I try to type the same command and ofcourse it doesn't work. I understand that when at home I'm on LAN network, that my laptops actually using my ISP's address which differ from 192.168.0.107 asummed 203.113.131.1. So could you tell me what IP that ssh shoud use for my laptop (at work) to connet to my computer at home? Thank you.

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• Constructing radiotap header and ieee80211 header structures for packet injection

  - by hektor

  I am trying to communicate between two laptop machines using Wifi. The structure of the radiotap header and ieee80211 header I am using is: struct ieee80211_radiotap_header { unsigned char it_version; uint16_t it_len; uint32_t it_present; }; /* Structure for 80211 header */ struct ieee80211_hdr_3addr { uint16_t frame_ctl[2]; uint16_t duration_id; unsigned char addr1[ETH_ALEN]; unsigned char addr2[ETH_ALEN]; unsigned char addr3[ETH_ALEN]; uint16_t seq_ctl; }; struct packet { struct ieee80211_radiotap_header rtap_header; struct ieee80211_hdr_3addr iee802_header; unsigned char payload[30]; }; /* In main program */ struct packet mypacket; struct ieee80211_radiotap_header ratap_header; struct ieee80211_hdr_3addr iee802_header; unsigned char addr1[ETH_ALEN] = {0xFF,0xFF,0xFF,0xFF,0xFF,0xFF}; /* broadcast address */ unsigned char addr2[ETH_ALEN] = {0x28,0xcf,0xda,0xde,0xd3,0xcc}; /* mac address of network card */ unsigned char addr3[ETH_ALEN] = {0xd8,0xc7,0xc8,0xd7,0x9f,0x21}; /* mac address of access point i am trying to connect to */ /* Radio tap header data */ ratap_header.it_version = 0x00; ratap_header.it_len = 0x07; ratap_header.it_present = (1 << IEEE80211_RADIOTAP_RATE); mypacket.rtap_header = ratap_header; /* ieee80211 header data */ iee802_header.frame_ctl[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_BEACON; iee802_header.frame_ctl[1] =IEEE80211_FC1_DIR_NODS; strcpy(iee802_header.addr1,addr1); strcpy(iee802_header.addr2,addr2); strcpy(iee802_header.addr3,addr3); iee802_header.seq_ctl = 0x1086; mypacket.iee802_header=iee802_header; /* Payload */ unsigned char payload[PACKET_LENGTH]="temp"; strcpy(mypacket.payload , payload); I am able to receive the packets when I test the transmission and reception on the same laptop. However I am not able to receive the packet transmitted on a different laptop. Wireshark does not show the packet as well. Can anyone point out the mistake I am making?

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• How does IPv6 subnetting work and how does it differ from IPv4 subnetting?

  - by Michael Hampton

  This is a Canonical Question about IPv6 Subnetting. Related: How does IPv4 Subnetting Work? I know a lot about IPv4 Subnetting, and as I prepare to (deploy|work on) an IPv6 network I need to know how much of this knowledge is transferable and what I still need to learn. IPv6 seems at first glance to be much more complex than IPv4. So I would like to know: IPv6 is 128 bits, so why is /64 the smallest recommended subnet for hosts? Related to this: Why is it recommended to use /127 for point to point links between routers, and why was it recommended against in the past? Should I change existing router links to use /127? Why would virtual machines be provisioned with subnets smaller than /64? Are there other situations in which I would use a subnet smaller than /64? Can I map directly from IPv4 subnets to IPv6 subnets? My interfaces have several IPv6 addresses. Must the subnet be the same for all of them? Why do I sometimes see a % rather than a / in an IPv6 address and what does it mean? Am I wasting too many subnets? Aren't we just going to run out again? In what other major ways is IPv6 subnetting different from IPv4 subnetting?

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• Terminating multi-mode fiber

  - by murisonc

  I'm looking at the feasibility of terminating multi-mode fiber connections ourselves. We would be using LC connectors. I've done some research and found two different methods. One requires polishing the ends and using epoxy while the other doesn't. I like the idea of not having to polish the ends but there doesn't seem to be much information on quality or ease of use. I've found two vendors (3M and Corning) that offer kits for terminating fiber without polishing or using epoxy. Does anyone have any experience with both methods that can offer some advice? Copper is easy but fiber seems to be a whole different animal. EDIT: After looking into fusion splicing suggested in the answer I've determined it's not for us. It's my understanding that is primarily used for outside plant and is better suited for single mode fiber. It's a good answer but doesn't address the question directly. Some more information about our situation. We will only be terminating multi-mode fiber inside a building and only doing between 4 and 20 pair a year. Hiring an outside person won't work due to our location. There are currently a couple people on-site that can terminate fiber (working for another company and charging large fees) but they can only do ST and SC connectors and we only use LC. So once again does anyone have experience with terminating using both epoxy type connectors and the other type (similar to Corning Unicam)?

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• Virtual guest does not have network access in cafe.

  - by blee

  My Virtualbox guest OS (Ubuntu on ubuntu host) does not connect to the internet when I have wifi access through an internet cafe system. By this, I mean where your browser redirects to an internal web page where you can enter a code. On the guest, I can successfully connect to the virtual network adapter, but I do not get internet access, nor a redirect to the internal web page. I use OpenDNS for the host. I have no problems when connecting through ethernet or regular wifi. Can someone tell me any of: 1) How to fix the problem. 2) How such cafe systems work. 3) At least point me to a technical explanation of such a cafe system so I can begin to troubleshoot. Thanks!

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• VPN to Buffalo WHR-HP-G300N produces a Connection Error 807

  - by Darius

  My friend has modem/router from Clear and I have sent him Buffalo router to put it between his Clear device and the Network. I walked him thru establishing VPN in DD-WRT but when I try to VPN I get a VPN Connection Error 807. I am out of ideas how to solve this. Any suggestion? Clear Modem WAN: xx.xx.xx.xx Clearn Modem NAT's to: 192.168.15.XXX Clear Modem DHCP: 192.168.15.2 - 192.168.15.2 (range is limited to that of ONE ip address) Clear Modem DMZ: 192.168.15.2 the LAN of the clear modem is 192.168.15.XXX The DD-WRT IP: 192.168.4.1 Port FWD: 1723 to 192.168.4.1 PPTP server listens on 192.168.4.1 Where is the problem with this setup?

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• Can I set up multiple accounts on DD-WRT? [closed]

  - by Greg Ros

  Possible Duplicate: Can I set up multiple accounts on DD-WRT? I want to set up multiple accounts on DD-WRT (accounts meaning, username-password pairs). Specifically, I want one to be used primarily for remote web management (though there is no reason to restrict the account to such). Is this possible? If so, how do I go about it? I'm running: Router Model TP-Link TL-WR1043ND Firmware Version DD-WRT v24-sp2 (08/07/10) std - build 14896

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• Network transfer from host to VM very slow - VMWare Server & Windows 2003 Server

  - by barfoon

  Hey everyone, Im trying to transfer a file from a Windows 7 host running VMWare Server to a Windows 2003 server VM, and it's painfully slow. I've tried adding/adjusting registry keys and settings found on KB articles, and still nothing. Ive tried this: http://support.microsoft.com/kb/898468 http://kb.vmware.com/selfservice/microsites/search.do?language=en_US&cmd=displayKC&externalId=1619 Vmware tools are installed. Any ideas? Thanks,

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• Rapidly changing public IP addresses on certain networks?

  - by zenblender

  I run/develop an online game where many of our users are in southeast asia. I recently went to southeast asia and made an alarming discovery. Anywhere I got internet access, whether it was via 3G, a LAN in a hotel, or wifi in a cafe, both in Singapore and the Philippines, I noticed that my IP address was changing CONSTANTLY. I mean the public IP address, not the private one. I could load a page like whatismyip.com and just hit reload and see a new IP address show up every 5-10 seconds! This has lots of consequences for my online game, as many things "break" if the IP address changes for a given user. Basically, I would like to know more about this. Is there a name for the kind of network or router or paradigm that causes this, so I can read up on it? I don't understand WHY a network would function this way. Does it do this on purpose? Is it for security reasons? Is it to anonymize and protect the identity of the users? Or is it just an "old" method that is mostly obsolete in the rest of the world? Thanks for any info that will help me to understand.

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• Moving Portable Office. Have a LAN & Phone line query?

  - by John Smith

  We are about to move a portable office that has 8 phones and 12 lan connections. They are all wired back to our main switch and Nortel bcm200 phone system which are only about 20m (65ft) away. After the move the office will be 180m (600ft) away from these. What is the maximum length of cable a digital phone line can be? I am aware that a lan connection can only be 100m (305ft) when using cat5e utp. Does this rule apply to phone connections also? If so how can I extend beyond 100m for the phones? I was going to install about three cabinets, 3 switches and 6 patch panels for the lan connections but the ideal struck me tonight that maybe I could run a fibre optic line. Would this be feasible? Any feedback on this is greatly appreciated. Thanks

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• Ubuntu Server 10.04 Heavy Network Traffic causes disconnect

  - by K Vaughan

  I'm currently running a headless Ubuntu 10.04 server. Installed is the LAMP stack, Joomla, Virtualbox, phpvirtualbox, webmin and proFTP.. It resolves the IP address so I can access it remotely (either the apache2 webserver or the FTP) using DDClient. Any packages installed have been installed using apt-get. Webmin, although discouraged in Ubuntu Server, is used mostly to administer the webserver aspect. This issue also appeared when I was using Ubuntu Server 10.10. After periods of heavy network traffic, whether local or remote, the connect drops. I'm talking specifically about the transfer of files via FTP, SCP or Samba (the latter of which I seldom use). There is no response to ping or ssh. I can't FTP to the server nor can I load the website. There are times when the server has been on for a few days and everything runs fine because I haven't accessed it much, if at all (thus not much network traffic). I've gone through a few hardware changes although I don't believe this has cause the issue: this has been happening long before I made any changes. At first I thought it was my ISP-provided router blocking traffic because of some kind of misconfiguration (perhaps assuming it was some kind of DoS attack). I've changed routers and still found no success. I've checked syslog, dmesg and kern.log for warnings but have uncovered none. I've ran memtest via the GRUB2 menu at boot and once it turned up 4 errors. I ran again with individual sticks of RAM in various slots and everything turned up fine. I've looked through the BIOS settings and everything looks fine. I've tried unplugging unnecessary pieces of hardware (other internal hard drives, CD drives, floppy, PCI cards, etc). Any help or tips on how I can even begin to troubleshoot this would be very much appreciated. Please note that i've only started playing with servers as a hobby so my knowledge wouldn't be the most refined. I'm comfortable with command line and have the initiative to know how to look up something I can't do. Unfortunately I can't seem to find any issues like this. Additionally: If a solution can't be found some assistance to write a script that will cause the server to reboot automatically if, after x minutes, it gets no response to pinging somewhere like google. Admittedly that's not the cleanest solution should my internet end up going down but I can't think of what else to do.

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• How to route HyperV VMs traffic through host VPN

  - by Random

  I'm using Windows 8.1 Pro with HyperV. I have several VMs for development, all of them connected with host via Internal adapter using network addresses: 192.168.10.0/24 Where: 192.168.10.1 is my host's Hyper-V internal NIC address. When I'm not in my office I use 3G usb dongle an dialup VPN connection. I would like to route traffic from all existing and future VMs through the VPN. In best scenario traffic would be routed only partially to the local company network addresses 10.1.1.0/24 I don't want to use sharing because I'm switching between WiFi, USB 3G dongle and VPN. Moving to other virtualization is also not an option for me.

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• What keeps you from changing your public IP address and wreak havok?

  - by Whitemage

  An interesting question was asked to me and I did not know what to answer.. So I'll ask here. Let's say I subscribed to an ISP and I'm using cable internet access. ISP gives me a public IP address of 60.61.62.63. What keeps me from changing this IP address to, let's say, 60.61.62.75 and mess with another consumer's internet access? For the sake of this argument, let's say that this other IP address is also owned by the same ISP. Also, let's assume that it's possible for me to go into the cable modem settings and manually change the IP address. Under a business contract where you are allocated static addresses, you are also assigned a default gaetway, a network address and a broadcast address. So that's 3 addresses the ISP "loses" to you. That seems very wastefull for dynamically assigned IP addresses where the majority of customers are.. Could they simply be using static arps? ACLs? Other simple mechanisms? Anyone who worked at an ISP would be willing to explain this a bit?

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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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