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• Setting up 802.1X wireless connection on OSX

  - by hizki

  I am an OSX user, I have Snow Leopard 10.6.5 and an updated AirPort. I am trying to connect to my university's wireless network, but it has a complex security that I am having trouble defining... Here there are instructions for connecting with Windows XP, Windows 7 and Linux. Can someone please instruct me what should I do to set up this network on my MAC? Thank you. P.S. I have had previous success in setting up this network, but I have no idea what I did that made it work. Since I updated my AirPort it worked only seldomly and very slowly... Before the update, even when it worked it never remembered my password.

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• Problem with Jumbo Frames

  - by Spookyone

  Hello, I am trying to set up jumbo frames on my gigabit home LAN but no luck so far. My setup is: * D-Link DIR-655 router, HW Revision A3, Firmware 1.21 EU * Synology DS107+, Firmware 3.0-1337 * Laptop w/ Win7 x64, external PCIx NIC managed by "Generic Marvel Yukon 88E8053 based Ethernet Controller" The router is supposed to support jumbo frames but doesn't feature any relevant setting. I set the Jumbo Packet value to 9000 on both the NIC and the Synobox but it doesn't work, ping -f -l 8972 says "Packet needs to be fragmented but DF set". Is there any other setting I overlooked, the DIR-655 doesn't actually support jumbo frames, or what else could be the problem?

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• DNS server at router level vs. computer level

  - by Craig

  I've three questions. Is it better/faster/optimal to set up your server's preferred and alternate DNS servers in your OS's network settings or in your router settings? Will it cause problems if it is set up in both places, both pointing to the same IPs? I am running Windows and I have my network assign a static IP to one of my computers. This doesn't allow me to obtain the DNS server addresses from my router automatically. Is there an IP I can put in that will cause it to take the DNS server addresses from the router?

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• Router to WIFI Client to Router (New solution for distance when repeater doesnt help)

  - by Kangarooo

  Ethernet to TL-WR340G with WIFI enabled Using TL-WA500 tried repeater mode which was not good enough and had password problems (could not connect if using either ASCII or Normal password in one way then in repeater worked other way) and also could not forward (repeat) WPA/WPA2 security. So since this repeater can also be as client, I made it as client and used another router (TL-WR740N) to get from wire connection from that client and all was working for a little bit. Every machine is set up to be auto DHCP. 1st when setting up client mode I found it working after doing reset. Then after some tens of minutes internet stopped working. When I removed WiFi client then all went back to normal. Where is the problem and how to make this work? Ethernet- TL-WR340G(AutoDHCP) ==> wifi ==> TL-WA500 TL-WA500 wifi client mode(AutoDHCP) ==> wire ==> TL-WR740N TL-WR740N router mode (AutoDHCP) ==> My Computer In other words: TL-WR340G ) ) ) ) TL-WA500 ===== TL-WR740N ==== PC1 ) ) WiFi === Wire

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• FortiGate firewall configuration with /30 and /28 networks

  - by slyderc

  I have fiber coming in from a new ISP which is being handed off via Ethernet on a single physical port. I'm having doubts about how to approach the configuration on my FortiGate 200A firewall because I've been given a /30 containing the ISP's gateway and another /28 for external IPs I can use: x.y.76.12/30 (.13 is the GW) x.y.76.64/28 (public IP space) How do I configure the FG200A's WAN1 interface to be aware of the two networks? As I only have one physical ISP port, will I need to plug it into a switch to break-out two cables and use a DMZ port on the FG200A for setting up the /28? Thanks in advance for your insight!

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• Oracle 11g network configuration

  - by Kylo

  I installed Oracle 11g Enterprise Edition on my Windows 7 Pro. My problem is that I cannot log into database from other host (local network). When I connect to database using Oracle SQLdeveloper everything is ok as long as I specify 'localhost' in connection configuration. However, when I change it to '192.168.0.190' which is my host IP address I get 'The Network Adapter could not establish the connection'. I get the same error when logging in from other host in local network. What is the problem?

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• Change Fedora 12 Hostname through gui

  - by drozzy

  How can I change fedora 12 hostname using gui tools (network connections) only, without editing config files? All I can see right now if I select "Manual" in IPv4 settings is "DNS servers" or DHCP client ID, neither of which sounds like "domain/hostname" combination. Tips?

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• Change Fedora 12 Hostname through gui

  - by drozzy

  How can I change fedora 12 hostname using gui tools (network connections) only, without editing config files? All I can see right now if I select "Manual" in IPv4 settings is "DNS servers" or DHCP client ID, neither of which sounds like "domain/hostname" combination. Tips?

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• All nework interfaces hang for seconds while one interface goes up/down

  - by user3698377

  I am building a client/server application that uses several network interfaces in parallel for redundancy, and I have noticed that while one network interface goes down or goes up, the communication on other interfaces hangs for several seconds. I could reproduce this behavior without my application in a simple way: there are 2 interfaces available on computer 1 ( Ethernet and WiFi ) ping from computer 2 the IP address of the Ethernet connection of computer 1 disconnect the WiFi of computer 1 ping hangs for seconds, and then the packets are traveling again between the 2 computers. The hanging happens as well if I turn back on the WiFi connection on computer 1. It happens as well if I ping the WiFi IP, and turn off/on the Ethernet connection ( or unplug/plug the cable). I am using Linux Ubuntu 12.04 on both computers. Any ideas why is this happening, and if / how can it be avoided?

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• Is to possible to achieve the SATA II's 3Gbps (375MBps) between home network storage and home computers?

  - by techaddict

  Gigabit ethernet only has 1Gbps (125MBps), whereas SATA II has up to three times that rate. Is it possible to achieve the rate of three times Gigabit ethernet connection which is SATA II speeds, between home network storage and the laptops and desktops with SATA II hard drives? If so, how? Or, is the limitation of a gigabit ethernet port on the laptops the limitng factor, making 1000Gbps the fastest practical transfer speed possible? (practical, meaning that without taking apart the laptop and doing physical modifications like branching a SATA II transfer cable, etc.) -- I just realized -- wouldn't a USB 3.0 cable do the trick? Since USB 3.0 can reach up to 675MBps?

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• ISP Load Balancing with ISA 2006

  - by Bill Best

  I understand that ISA 2006 has an integrated Network Load Balancing feature. We also recently acquired a second internet line through a second service provider. I know it is possible to purchase a NLB router for using both incoming lines but this is not the route we would like to take if at all possible. Thus, is it possible to have two ISA 2006 servers each with there own external connection, Load balanced to be viewed as one gateway? My thought was to have two ISA servers each with three NICs, one external, one internal and one for cross communication. I am under the impression that this should work but was hoping someone else has had experience with it.

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• Posting data from multiple servers routing through one server to client server

  - by Swaroop Kundeti

  I have 5 webservers behind Load balancer and we have a client server at other end. Client has white listed my 5 webserver public ip so that my webservers will post a file to the client server. Here the problem is my webservers is going to increase and i cannot always ask client to make my new webserver ip's white list. So i would like to make my infra this way, my webservers will post data to the client server routing from a single server. Like assume that web-1 is main server and the remaining 4 web servers will post data to client server routing through main web-1. I was told that this can be achieved by doing IP Tunneling. But i have no idea how to do that. Would be great for any kind of help.

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• Internet connection issue

  - by Mr New

  For some reason this laptop doesn't want to stay connected to the Internet... I have to restart the DHCP client service every time to fix the connection problem. Could someone tell me whats going on because I didn't have to usually do this? And I'm not sure if these problems are connected but the sound also disconnects itself and I have to enable it back, but everything that was using audio has to be restarted in order to hear it, even the browser? There are no external speakers and I didn't install any new software. My laptop is an XPS M1530, running Windows Vista.

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• Display wireless channels currently in use

  - by DrStalker

  Is there any windows utility to display the wireless channels are currently in use by the available wireless networks? I'd like to be able to see what existing channels are using so I can try to minimize interference on a new access point without a lot of trial and error.

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• Is there a driver for a hub?

  - by Nrew

  Is there a driver for a hub/switch? So that I can control the flow of data from the other computer that currently uses bandwidth, so that I could get higher bandwidth.

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• Connection drops while transferring large files to one server on a network

  - by Charlotte

  My company has two sites, each with their own LAN, using site to site VPN tunnel to connect the two sites. When transferring files (especially larger files) from site1 to site2 server1, the file transfer fails. I don't think this can be a VPN issue because transferring the same files to site2 server2 which is on the same network as server1 works fine. Pings to server1 and server2 at site2 from site1 are about the same, mostly 19/20ms with the odd one up to 50ms. As server1 is DB server with a high load I thought the NIC maybe overloaded, but a transfer from site2 server1 to site2 server2 works fine, and that uses the same NIC on server1 as transfers from site1 to site2 server1. The servers are both Windows Server 2003 VMs with VMXNET 3 NICs. Site2 Server1 route print: IPv4 Route Table =========================================================================== Interface List 0x1 ........................... MS TCP Loopback interface 0x10003 ...00 50 56 99 28 9b ...... vmxnet3 Ethernet Adapter #2 0x10004 ...00 50 56 99 18 97 ...... vmxnet3 Ethernet Adapter =========================================================================== =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 172.20.10.1 172.20.10.18 10 10.10.10.0 255.255.255.0 10.10.10.70 10.10.10.70 10 10.10.10.70 255.255.255.255 127.0.0.1 127.0.0.1 10 10.255.255.255 255.255.255.255 10.10.10.70 10.10.10.70 10 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 172.20.10.0 255.255.255.0 172.20.10.18 172.20.10.18 10 172.20.10.18 255.255.255.255 127.0.0.1 127.0.0.1 10 172.20.255.255 255.255.255.255 172.20.10.18 172.20.10.18 10 224.0.0.0 240.0.0.0 10.10.10.70 10.10.10.70 10 224.0.0.0 240.0.0.0 172.20.10.18 172.20.10.18 10 255.255.255.255 255.255.255.255 10.10.10.70 10.10.10.70 1 255.255.255.255 255.255.255.255 172.20.10.18 172.20.10.18 1 Default Gateway: 172.20.10.1 =========================================================================== Persistent Routes: None Site2 Server2 route print IPv4 Route Table =========================================================================== Interface List 0x1 ........................... MS TCP Loopback interface 0x10003 ...00 50 56 99 15 00 ...... vmxnet3 Ethernet Adapter =========================================================================== =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 172.20.10.1 172.20.10.114 10 127.0.0.0 255.0.0.0 127.0.0.1 127.0.0.1 1 172.20.10.0 255.255.255.0 172.20.10.114 172.20.10.114 10 172.20.10.114 255.255.255.255 127.0.0.1 127.0.0.1 10 172.20.255.255 255.255.255.255 172.20.10.114 172.20.10.114 10 224.0.0.0 240.0.0.0 172.20.10.114 172.20.10.114 10 255.255.255.255 255.255.255.255 172.20.10.114 172.20.10.114 1 Default Gateway: 172.20.10.1 =========================================================================== Persistent Routes: None Site1 Server route print: =========================================================================== Interface List 14...00 50 56 93 00 0b ......vmxnet3 Ethernet Adapter #2 1...........................Software Loopback Interface 1 12...00 00 00 00 00 00 00 e0 Microsoft ISATAP Adapter 13...00 00 00 00 00 00 00 e0 Teredo Tunneling Pseudo-Interface =========================================================================== IPv4 Route Table =========================================================================== Active Routes: Network Destination Netmask Gateway Interface Metric 0.0.0.0 0.0.0.0 192.168.168.1 192.168.168.118 261 127.0.0.0 255.0.0.0 On-link 127.0.0.1 306 127.0.0.1 255.255.255.255 On-link 127.0.0.1 306 127.255.255.255 255.255.255.255 On-link 127.0.0.1 306 192.168.168.0 255.255.255.0 On-link 192.168.168.118 261 192.168.168.118 255.255.255.255 On-link 192.168.168.118 261 192.168.168.255 255.255.255.255 On-link 192.168.168.118 261 224.0.0.0 240.0.0.0 On-link 127.0.0.1 306 224.0.0.0 240.0.0.0 On-link 192.168.168.118 261 255.255.255.255 255.255.255.255 On-link 127.0.0.1 306 255.255.255.255 255.255.255.255 On-link 192.168.168.118 261 =========================================================================== Persistent Routes: Network Address Netmask Gateway Address Metric 0.0.0.0 0.0.0.0 192.168.168.1 Default =========================================================================== IPv6 Route Table =========================================================================== Active Routes: If Metric Network Destination Gateway 1 306 ::1/128 On-link 14 261 fe80::/64 On-link 14 261 fe80::3c6b:996f:ef36:ee76/128 On-link 1 306 ff00::/8 On-link 14 261 ff00::/8 On-link =========================================================================== Persistent Routes: None tracert from site1 to site2 server1: Tracing route to server1 [172.20.10.18] over a maximum of 30 hops: 1 19 ms 19 ms 19 ms server1 [172.20.10.18] Trace complete. tracert from site2 server1 to site1: When this was run it went to the external IP of site2, then to a couple of external ips of the isp, then times out. Can anyone suggest any troubleshooting steps? Thanks, Charlotte.

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• Sniffing at work- How to detect

  - by coffeeaddict

  Because of the place I work has some real issues (people) especially in IT and the owner, I wonder if we are being sniffed. Is there any way to tell if on a Vista 64-bit machine: 1) In system logs some identification that would tell me that someone might log into my PC such as an Admin 2) Something in the logs that would give me a flag about maybe I'm being monitored some other way? 3) How can I be sure that my gmail, hotmail, and chat is not being sniffed. I know there are things like Simp, etc. I'm talking about specific hidden system signs either in registry or logs. Obviously I'm not going to raise any suspicion by me asking our network admin. I don't trust anyone at this company. is there a good way to basically monitor for this as an end user? Could someone log in and basically watch me work and if so, would there be any goodies left behind for me to find out if this has happened other than visual signs which would not be present...maybe some running processes?

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• server will not reply (syn -ack)

  - by Brent

  I like to use the following commands to manage 'TIME_WAIT', in the hope to free up resources. echo 20 > /proc/sys/net/ipv4/tcp_fin_timeout sysctl -w net.ipv4.tcp_tw_reuse=1 sysctl -w net.ipv4.tcp_tw_recycle=1 I found something interesting while doing a tcpdump. Sometimes if a client makes a connection (syn), the server will not reply (syn -ack). My question is, could it be because of the top three commands.

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• How to get gigabit network speeds on Windows XP?

  - by JB

  We've just installed gigabit switches at work, and things on the Linux side are going well. Our linux boxes, which use a Intel Corporation 82566DM-2 Gigabit nic (according to lspci), consistently get over 900 mbits/sec: iperf -c ipserver ------------------------------------------------------------ Client connecting to ipserver, TCP port 5001 TCP window size: 16.0 KByte (default) ------------------------------------------------------------ [ 3] local 192.168.40.9 port 39823 connected with 192.168.1.115 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 1.08 GBytes 929 Mbits/sec We have a bunch of Windows XP 64-bit machines that use Broadcom NetXtreme 57xx cards. I spent around a day trying to get equivalent speeds on them, but couldn't get above 200 Mbits/sec. I noticed the Windows iperf tests said that the TCP window size was 8 Kb by default (as opposed to 16 Kb on Linux, so I modified my test to reflect that. Still no love. I went to Broadcom's site, downloaded the latest drivers for the card and installed. Still no love. However, finally, I tried a 64 Kb window size with the new drivers, and finally an improvement! $ iperf -c ipserver -w64k ------------------------------------------------------------ Client connecting to ipserver, TCP port 5001 TCP window size: 64.0 KByte ------------------------------------------------------------ [ 3] local 192.168.40.214 port 1848 connected with 192.168.1.115 port 5001 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.0 sec 933 MBytes 782 Mbits/sec Much better, but still not really taking advantage of the full capabilities of the network. If the Linux box can reach 950 Mbits/sec consistently, this box should be able to as well. Also, if you're wondering about the medium, this is over the same cable...I'm switching back and forth. Any suggestion or ideas would be really welcome. Thanks!

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• What are the challenges when my enterprise desires to move the processing component of an applicatio

  - by Berkay

  Assume that i have an enterprise accounting application that consists of a front-end interface, a processing tier, and a back-end database. This is an application that contains private business data, and thus is traditionally run in a secure private network environment within the enterprise. What are the challenges that appear when my enterprise desires to move the processing component of this application to a cloud computing data center in order to achieve greater scalability or to reduce IT costs ? Pls note: do i have to make significant changes to my own infrastructure to enable external access to formerly private resources? do i have to modify the application code to handle new network topology ? thanks, if you give your answers in a simple manner, really appreciated.

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• What decent small-office level routers are there

  - by Glenn Slaven

  So let's say I have a network of less than 20 computers including a server that needs to be accessed externally. What router/firewall solutions would you recommend? It can be either hardware or software and would need to be able to do NAT Firewall DMZ Native VPN if possible Some form of network bandwidth monitoring Update: I've accepted the answer I liked but this question probably doesn't have a definitive answer, it would depend on your requirements. Please leave more suggestions with an explanation as to why it works well in your situation.

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• Wireless Repeating with two Netgear N750 (WNDR4300)

  - by jomo1911

  I have a Netgear N750 as my main router, which connects to the internet via a modem. I have a second Netgear N750 which I want to use to repeat the wireless signal of the main router. I logged in to routerlogin of my main router (192.168.1.1) and set up the "Wireless Repeating Function". I set it as the "Wireless Base Station" and filled in the MAC adress of my second Netgear N750. Then I logged in to routerlogin of my second router and set it up as the "Wireless Repeater", I gave it the IP 192.168.1.11 and filled in the MAC adress of the base station. During the setup of the second router (Repeater) I had to disable all security functions. If I connect to the repeaters' WLAN signal, I get no internet connection. Maybe you can help me, thanks

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• How can I find the USB wireless adapter into the dmesg log file?

  - by AndreaNobili

  I am pretty new in Linux (RaspBian for RaspBerry Pi but I think that there are not difference) and I have to install an USB wireless network adapter (the product is the TP-Link TL-WN725N, this one: http://www.tp-link.it/products/details/?model=TL-WN725N ) Now, I think that this is not automatically recognized by my system because if I execute ifconfig command I obtain the following output: pi@raspberrypi ~ $ ifconfig eth0 Link encap:Ethernet HWaddr b8:27:eb:2a:9f:b0 inet addr:192.168.1.8 Bcast:192.168.1.255 Mask:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:475 errors:0 dropped:0 overruns:0 frame:0 TX packets:424 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:34195 (33.3 KiB) TX bytes:89578 (87.4 KiB) lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) So now it see only my ethernet network interface and not the wireless. So I was thinkig to try to see into the dmesg, but I don't know what have I to see and how to select it into the dmesg output. For example by the following command I can see the line of the dmesg log file relate to my ethernet port: pi@raspberrypi ~ $ cat /var/log/dmesg |grep -i eth [ 3.177620] smsc95xx 1-1.1:1.0 eth0: register 'smsc95xx' at usb-bcm2708_usb-1.1, smsc95xx USB 2.0 Ethernet, b8:27:eb:2a:9f:b0 [ 18.030389] smsc95xx 1-1.1:1.0 eth0: hardware isn't capable of remote wakeup [ 19.642167] smsc95xx 1-1.1:1.0 eth0: link up, 100Mbps, full-duplex, lpa 0x45E1 But what can I try to search for the USB wireless adapter? Tnx

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• Multiple access points for the same SSID ?

  - by krosenvold

  I need to upgrade my existing wireless infrastructure and this time I want 2 access points to cover my house, since I get blind spots no matter what with a single AP, I have physical cabling to my central network available for both access points. But I would really like these two to interoperate seamlessly as a single SSID. How do I do this and what are the features the new AP's I'm buying need to support ? (Product recommendations are welcome ;)

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• Best practice for assigning private IP ranges?

  - by Tauren

  Is it common practice to use certain private IP address ranges for certain purposes? I'm starting to look into setting up virtualization systems and storage servers. Each system has two NICs, one for public network access, and one for internal management and storage access. Is it common for businesses to use certain ranges for certain purposes? If so, what are these ranges and purposes? Or does everyone do it differently? I just don't want to do it completely differently from what is standard practice in order to simplify things for new hires, etc.

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