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• TCP Windows Size vs Socket Buffer Size on Windows

  - by Patrick L

  I am new to Windows networking. When people talk about TCP tuning on Windows platform, they always mention about TCP Window Size. I am wondering whether Windows uses the concept of "Socket Buffer Size"? On Windows XP, the TCP window size is fixed. We can set it using the TCPWindowSize registry value. How about Socket Buffer Size? How can we set Socket Buffer size on Windows? Can we set it to a value different from TCP window size?

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• Network trials and tribulations

  - by MauiWowie

  Hi, I am in the process of setting up a small (two PC's, both running Windows 7) network using a D-link DI-604 router (which acts only as hub, it's not set up in any way). In the Network and 'Sharing Center' in 'Control Panel' I clicked 'Set up a New (Connection or) Network'. All went well up until the moment I attempted to connect one PC with the other (in the 'Connect' dialog I entered the other PC's IP, no pwd). I can use both PC's to connect to and browse the net though, so the router/hub does not seem to be the problem. And I must have done something right, because the other computer shows up in the 'Network Map'. Any and all help is much appreciated!

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• LinkSys WRT54GL + AM200 in half-bridge mode - Setup guide recommendations?

  - by Peter Mounce

  I am basically looking for a good guide on how to set up my home network with this set of hardware. I need: Dynamic DNS Firewall + port-forwarding VPN Wake-on-LAN from outside firewall VOIP would be nice QoS would be nice (make torrents take lower priority to other services when those other services are happening) DHCP Wireless + WPA2 security Ability to play multiplayer computer games I am not a networking or computing neophyte, but the last time I messed with network gear was a few years ago, so am needing to dust off knowledge I kinda half have. I have read that I should be wanting to set up the AM200 in half-bridge mode, so that the WRT54GL gets the WAN IP - this sounds like a good idea, but I'd still like to be advised. I have read that the dd-wrt firmware will meet my needs (though I gather I'll need the vpn-specific build, which appears to preclude supporting VOIP), but I'm not wedded to using it. My ISP supplies me with: a block of 8 static IPs, of which 5 are usable to me a PPPoA ADSL2+ connection

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• Security tips for adding wireless AP to domain network?

  - by Cy

  I am researching best-practices for adding wireless to our existing domain network. My DHCP server is running Windows Server 03 Standard (not sure if thats useful). I am familiar with simple home networking but I thought I'd get some expert advice for the more advanced stuff. Any tips and / or best-practices? Is this Cisco Wireless Access Point a good option? Are there any additional hardware recommendations? Thank you in advance for your help.

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• VPN connection sharing for Ubuntu guest

  - by pzico

  I have Ubuntu 10.04 guest on Windows XP host. I need to use a specific VPN software that works only on Windows. How should I configure virtualbox/guest so that the VPN connection would be visible on guest? I already tried NAT and bridged network settings. With both of these options I get only normal internet connection to work, but sites requiring VPN don't work on guest, only on host.

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• Connect to wired and wireless networks at same time, Ubuntu

  - by Gary Chambers

  Currently, I have a media PC running Ubuntu 10.04 that I am trying to connect via a wired network cable directly to a NAS box, and wirelessly to the router. This works no problem after I run sudo /etc/init.d/networking restart but I can't get both interfaces to come up on system startup. My /etc/network/interfaces file reads as follows: auto eth0 iface eth0 inet static address 10.0.1.2 netmask 255.255.254.0 broadcast 10.0.1.255 network 10.0.1.0 auto wlan2 iface wlan2 inet dhcp As I say, I know this works, because I can get it to work by restarting the network interfaces, but I can't bring them both up on system startup. Does anyone know why this might be?

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• Sharing wireless internet connection between 2 Ubuntu 10.04 systems using cross-over cable

  - by Gary

  I have a Lenovo T60 with Ubuntu 10.04 connected with a cross-over cable to a Dell Vostro 1400, also running Ubuntu 10.04. My internet is coming into the Lenovo through an external wireless antennae, and I want to share the internet with the Dell. On the Lenovo: eth0 connection has IPv4 Settings 'Shared to other computers' I can ping the Dell (10.42.43.10) successfully I can use mtr to trace to www.google.com successfully On the Dell: eth0 connection has IPv4 Settings 'Automatic DHCP' I can ping the Lenovo (10.42.43.1) successfully when I use mtr to trace to www.google.com, I can only reach 10.42.43.1 I must be missing some setting, but cannot see what it is; can anyone help me?

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• Very slow accessing printer shared from Windows Machine

  - by Tarski

  How do I go about debugging a networking problem where the office printer is shared off a Windows XP PC and is very slow from me to access? Print/changing any settings can take several minutes and applications often display "Not Responding" in this time. My machine is a Windows Vista PC. The other PCs in the office are either Vista or XP and do not suffer from any printing problems. I am not experiencing any other network related problems, I can access the web and e-mail fine. The printer is a HP officejet Pro 8000

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• Sharing soundcard to network.

  - by zerkms

  Let's suppose I have a laptop (L) and desktop PC (D), both with Windows 7 onboard. It is SB X-Fi extreme soundcard with rather good 5.1 home theater connected. But it is not comfortable to watch video sitting on the sofa from my desktop (sofa is in the center of the room and D is in the corner), even though it is 23" monitor. So I'm watching everything from the laptop. So the question - is it possible somehow to "share" soundcard from D to L, so I will watch the video from notebook and listen the sound from the 5.1? L and D are connected via wi-fi (fast enough).

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• Stop sharing network shares without removing them?

  - by lance

  I have several shares on my Win7 machine. I need them to disappear from the network (and stay gone across reboots), without my having to actually remove the shares (because they need to re-appear in a week). Is there something I can disable/stop on my machine (I'm thinking a service?) that will get this done? There are no network shares I need to keep available to the network (during this time).

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• Windows 7 connect to Lion file sharing

  - by Automaton

  Trying to access my Mac from a Windows 7 computer, I fail with the infamous error 86 incorrect password. Now this appears to be a well-known problem with countless threads on the internet giving as many "solutions" as there are discussion threads about it (mostly ranging from installing third-party commercial samba servers, to switching to some other protocol, to compiling a plain-vanilla Samba installation - the latter which I will probably do when I give up this :) ) I am stubborn, and I believe there must be some problem here that can be solved or worked around, but there is surprisingly little detail about this problem. It appears to have something to do with a mismatch of authentication methods. Trying to run samba in debug mode: sudo /usr/sbin/smbd -debug -stdout gets me this output when trying to access it from Win 7 ... smb1_dispatch_one [smb_dispatch.cpp:377] dispatching SMB_COM_SESSION_SETUP_ANDX smb1_dispatch_session_setup [session_setup.cpp:261] FIXME erase existing sessions log_gss_error [gssapi_mechanism.cpp:97] gssapi: gss-code: Miscellaneous failure (see text) log_gss_error [gssapi_mechanism.cpp:113] gssapi: mech-code: unknown mech-code 22 for mech unknown What is the problem here, and how do I fix it?

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• LinkSys WRT54GL + AM200 in half-bridge mode - UK setup guide recommendations?

  - by Peter Mounce

  I am basically looking for a good guide on how to set up my home network with this set of hardware. I need: Dynamic DNS Firewall + port-forwarding VPN Wake-on-LAN from outside firewall VOIP would be nice QoS would be nice (make torrents take lower priority to other services when those other services are happening) DHCP Wireless + WPA2 security Ability to play multiplayer computer games I am not a networking or computing neophyte, but the last time I messed with network gear was a few years ago, so am needing to dust off knowledge I kinda half have. I have read that I should be wanting to set up the AM200 in half-bridge mode, so that the WRT54GL gets the WAN IP - this sounds like a good idea, but I'd still like to be advised. I have read that the dd-wrt firmware will meet my needs (though I gather I'll need the vpn-specific build, which appears to preclude supporting VOIP), but I'm not wedded to using it. I live in the UK and my ISP supplies me with: a block of 8 static IPs, of which 5 are usable to me a PPPoA ADSL2+ connection

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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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• Does a bad Internet connection increase bandwidth usage?

  - by Synetech

  My (Rogers) cable connection has been pretty bad recently (channels 3 and 10 are particularly fuzzy—it’s analog, not digital cable). Not surprisingly, this has caused my cable modem to drop out and have to reestablish a connection a couple of times since it started. The poor connection of course means higher corruption (not necessarily dropped per se) which causes the TCP/IP stack to have to retransmit packets more often. Reduction of bandwidth throughput aside, I got to wondering if it increases the actual bandwidth usage. That is, if there is a high error rate on the line causing packets to have to be retransmitted: Does this increase a bandwidth monitoring program’s numbers? Does the ISP count the retransmitted packets toward the monthly cap? Based on what I remember from my university networking courses and common sense, I have a feeling that the answer to both questions is yes, but I cannot reliably measure the first, and have no authoritative answer for the second. I’m wondering if maybe the retransmitted packets are acknowledged as being duplicates and thus not counted somewhere along the line.

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• How do I access an Ubuntu VirtualBox guest at a static IP from an OS X host?

  - by David Siegel

  How does one configure an Ubuntu guest to use a static IP that's visible to an OS X host, and ensure that the static IP is independent of the host's network configuration? I previously used bridged networking for my guest, but I'm constantly moving my host between networks so the guest IP is always different. First, I tried setting the guest network configuration to NAT and forwarding host port 1022 to guest port 22, so I could at least ssh to a fixed address (localhost:1022): $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/Protocol" "TCP" $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/GuestPort" 22 $ VBoxManage setextradata "Ubuntu Server" "VBoxInternal/Devices/e1000/0/LUN#0/Config/SSH/HostPort" 1022 Then, $ ssh localhost -p 1022 ssh: connect to host localhost port 1022: Connection refused But this didn't work (guest has no network access with NAT and OS X refused the connection, as you can see). I'd love a general solution that would let me communicate with my guest at a fixed IP.

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• How a router decides destination of packet?

  - by user58859

  I have basic networking question. Scenario : Two pc's are communicating on a wan. Both the pc's ate behind routers or modems. My question : Both the pc's have public IP of each other. That public IP is most of the time is either of the router or of the modem. There can be more then one pc's behind those routers and modems. Then how the pc's are communicating. I can understand the packets can reach upto those routers or modems. But what after that. In the packet , destination IP is public IP. Then how the router or modem decides where to send the packet? Can anybody explain me this please. Thanks in advance.

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• Sharing svn reposities between web servers

  - by Luke

  I have my subversion hosting set up to be accessed through Apache web server. Everything runs fine. Now I'd like to add another web server to distribute the load between two web servers. Is it save to have my svn repositories accessed by two web servers at the same time? Does the normal fsfs subversion repository type protect me enough or do I need to switch to Berkely DB for this sort of thing?

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• How to have 2 windows machines on the same network with the same IP address

  - by Stu

  I have a custom made ADC device that is spitting out data by addressed UDP packets. I have that device plugged into a 4 port switch. I have one windows embedded standard 7 machine which is the normal recipient of that data. To be able to receive the data (Using LabVIEW) the windows network adapter IPv4 settings must have a static IP address that corresponds to the UDP packet destination. I would like to add a second windows machine (This one is just regular Win 7 Pro) to simultaneously catch the data, however with all devices connected to the switch, the Win 7 Pro machine recognizes an IP address conflict and will not take the setting for the required static IP address. (The network adaptor settings show that the correct value has been entered but ipconfig shows that it is not actually set.) Neither windows machine needs to transmit network data, they only need to be able to receive the UDP data from the ADC device. Is there any way to disable this IP address conflict detection 'feature' of windows networking?

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• Dell Powervault MD3000 - Not sharing Files between servers

  - by Kevin

  I'm a developer who has to set up a Dell Powervault MD3000 due to lack of resources. I have connected the Powervault to 2 Dell 2950 servers via the SAS cables. I performed the setup using Dell's MD Storage Manager software (4 disks, RAID 5 with hot spare). Then I added the disks using Windows 2003 disk management (Basic, not dynamic disk and formatted with NTFS). When I add files to the array from one server, they are not visible on the other server (and vice-versa). Is the error in the windows disk management configuration?

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• Not able to connect to internet in RHEL 5

  - by chankey007

  I just installed red hat enterprise 5 in my laptop and on desktop both. In desktop it is working fine but in laptop it is not showing the eth device. (I tried ifconfig only lo is there). I tried ifup eth0 still nothing happened. The network service in /etc/sysconfig/network-scripts/ifcfg-eth0 and in /etc/sysconfig/network are enable. I had ubuntu in my laptop before and I faced same problem with that too. Is there any problem with my laptop? I have my system on dual boot and in win7 networking is running fine. I am not able to connect to the internet only, other devices are working fine. System conf: Sony vaio E series. 3 GB RAM, intel core i3 2.13 GHZ.

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• Not able to connect to internet in RHEL 5

  - by chankey007

  I just installed red hat enterprise 5 in my laptop and on desktop both. In desktop it is working fine but in laptop it is not showing the eth device. (I tried ifconfig only lo is there). I tried ifup eth0 still nothing happened. The network service in /etc/sysconfig/network-scripts/ifcfg-eth0 and in /etc/sysconfig/network are enable. I had ubuntu in my laptop before and I faced same problem with that too. Is there any problem with my laptop? I have my system on dual boot and in win7 networking is running fine. I am not able to connect to the internet only, other devices are working fine. System conf: Sony vaio E series. 3 GB RAM, intel core i3 2.13 GHZ.

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• What is the advantage of iSCSI over SMB?

  - by sofakng

  At my house I'm running a Hyper-V server with a Windows Server 2008 R2 VM acting as a file server. Files are shared across my network using SMB. (Also, the machine is using a PERC 6/i RAID card but I don't think that's important) I'm thinking about setting up a dedicated SAN (iSCSI) machine and then switching my Hyper-V server to ESXi. What are the advantages of using iSCSI versus SMB? I think I would still need a file server OS (eg. Win 2k8) sharing files via SMB so I'm not sure the end result would be any different than my current setup...

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• Sharing settings between a few virtual hosts in Apache

  - by Ivan Virabyan

  There are many virtual hosts in my apache configuration, each having quite a big amount of settings. The problem is that most of the virtual servers have the same settings. So config file is huge, full of identical virtual hosts, that differ only by ServerName directive. To change or add setting, I need to go through all of these vhosts. Is it possible to somehow share settings between virtual hosts, but still having few of them with their own ones? I hoped dynamic vhosts would be a good solution, but as I understand, it doesn't fit my problem, because there is no way to set specific settings for some of the vhosts. Furthermore I don't want my vhosts to be dynamic, because I have a fixed number of them. ServerAlias directive is also not a solution, because I need to know what url the user came from.

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• Setting up the metasploitable in virtualbox

  - by SetSlapShot

  I'm supposed to try and use kali to do exploits on metasploitable, but I'll burn that bridge when I get there. My question right now is: How do I set up a host only network on virtualbox? I heard that it was unsafe to run metasploitable in bridged networking mode, that host only or NAT is better. When I run metasploitable on NAT, the kali box (attacker) has the same ip address as the metasploitable box, and nmap doesn't really return anything except what I can only assume would be a scan of its own ports? I tried to create a host only network in virtual box. I left the adapter settings at the default, and unchecked DHCP server. now when I run ifconfig on the metasploitable box, there is no ip address listed. Am I setting up/connecting to/not configuring the host only network correctly?

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• Directories shown as files, when sharing a mounted cifs drive

  - by Johan Sigfred Abildskov

  I have an issue where a directory is shown as a file when accessing a samba share ( on Ubuntu 12.10 ) from a Windows machine. The output from ls -ll in the folder on the linuxbox is as follows: chubby@chubby:/media/blackhole/_Arkiv$ ls -ll total 0 drwxrwxrwx 0 jv users 0 Jun 18 2012 _20 drwxrwxrwx 0 jv users 0 Apr 17 2012 _2006 drwxrwxrwx 0 jv users 0 Apr 17 2012 _2007 drwxrwxrwx 0 jv users 0 May 12 2011 _2008 drwxrwxrwx 0 jv users 0 Feb 19 09:53 _2009 drwxrwxrwx 0 jv users 0 Dec 20 2011 _2010 drwxrwxrwx 0 jv users 0 May 8 2012 _2011 drwxrwxrwx 0 jv users 0 Mar 5 11:37 _2012 drwxrwxrwx 0 jv users 0 Feb 28 10:09 _2013 drwxrwxrwx 0 jv users 0 Feb 28 11:18 _Mailarkiv drwxrwxrwx 0 jv users 0 Jan 3 2011 _Praktikanter The entry in /etc/fstab is: # Mounting blackhole //192.168.0.50/kunder/ /media/blackhole cifs uid=jv,gid=users,credentials=/home/chubby/.smbcredentials,iocharset=utf8,file_mode=0777,dir_mode=0777 0 0 When I access the share directly from the NAS on my Windows box, there are no issues. The version of Samba is 3.6.6, but I couldn't find anything in the changelogs that seem relevant. I've tried mounting it in different locations with different permissions, users and groups but I have not made any progress Due to my low reputation on serverfault ( mostly stackoverflow user ) I'm unable to post a screenshot that shows that the directories are shown as files. If I type the full path in explorer, the directory listing works excellently, except for any subdirectories that are then shown as files. Any attack vector for this issue would be greatly appreciated. Please let me know if I have provided insufficient details. Edit: The same share when accessed from a OS X, works perfectly listing the directories as directories. Best Regards!

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