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• LAN speeds and firewall/switch connections

  - by microchasm

  I have a small network with about ten users. All workstations flow into a Dell PowerConnect 3424 which then has a single link to a SonicWALL firewall and from there to a cable modem. More important than internet connectivity is speed between machines (specifically a Windows Server box on the LAN which everyone uses simultaneously). I believe the…

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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…

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• How to take advantage of two Internet connections (WiFi / Wired)?

  - by Madhur Ahuja

  I have two separate internet connections, one through WiFi and other Wired. However, generally I have observed that Windows try to use only one ( mostly faster one/ Or Wired by preference - I am not sure). Is there a way I can take advantage of having both ? For example I can have my web browser use the wired one and my torrent software use…

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• 10 GigE interfaces limits single connection throughput to 1 Gb on a ProCurve 4208vl

  - by wazoox

  The setup is as follow : 3 Linux servers with Intel CX4 10 GigE controllers and an X-Serve with a Myricom 10 GigE CX4 controller are connected to a ProCurve 4208vl switch, with a myriad of other machines connected through good ol' 1000 base-T. The interfaces are actually set up as 10 Gig, according to both the switch monitoring interface and…

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• Not getting gigbit from a gigabit link?

  - by marcusw

  I just upgraded my LAN to gigabit. This is what netperf has to say about things. Before: marcus@lt:~$ netperf -H 192.168.1.1 TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 192.168.1.1 (192.168.1.1) port 0 AF_INET : demo Recv Send Send Socket Socket Message Elapsed Size Size Size…

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• assign auto static ip on ubuntu 10.04

  - by ronakin

  I'm trying to set auto static ip. I've set the content of /etc/network/interfaces to be: auto lo auto eth0 iface eth0 inet static address 192.168.1.2 netmask 255.255.255.0 gateway 192.168.1.1. and /etc/resolv.conf to be: nameserver 192.168.1.1. It seems that the ip address have set successfully. However, when I plug out the lan cable…

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• How important is dual-gigabit lan for a super user's home NAS?

  - by Andrew

  Long story short: I'm building my own home server based on Ubuntu with 4 drives in RAID 10. Its primary purpose will be NAS and backup. Would I be making a terrible mistake by building a NAS Server with a single Gigabit NIC? Long story long: I know the absolute max I can get out of a single Gigabit port is 125MB/s, and I want this NAS…

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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: …

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• Why do partially failed/failing switches fail to pass DHCP?

  - by David Mackintosh

  I've noticed this several times: a switch starts to behave oddly. Usually if the switch doesn't fail outright, what tends to get noticed is that DHCP doesn't work. We had a Linksys SRW-224P fail today. Systems which were still connected worked properly, until it came time to renew their DHCP lease. Once the lease expired, they stopped…

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• How to test/debug bad network wiring?

  - by Jack Lloyd

  I recently bought a place already wired with Cat 5E (8 ports, leading to a central closet). However attempting to get link, nothing works. On closer examination, it was obvious that the ends in the closet were wired backwards (brown on pin 1, etc). The jacks that I've pulled out of the wall do look to be correctly done. However, testing…

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• Ubuntu 10.04 says wired network disconnected, but it works

  - by mistily

  I've installed ubuntu 10.04, hoping to get rid of the 9.10 errors. (Nvidia driver didn't work quite properly, had some problems with clicking in flash, and I had -and still have- wired network working, but ubuntu said that it's disconnected) So the Nvidia driver is better now, but the network error is the same. I still have a working…

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• How can I hide my network connections in the task bar when I'm not connected?

  - by CodeSlave

  How can I hide my network connections (the PC with the red X icon on the task bar) when I'm not using a that connection. Typically, I switch back and forth between wireless and wide connections depending on my location, so I don't want to just simply disable the network device.

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• Do I need a Gigabit router with a 24Mbps down and 7Mbps upload speed cable modem?

  - by djangofan

  Do I need a Gigabit port capable wireless router with a 24Mbps down and 7Mbps upload speed cable modem? Does anyone know how to calculate this? FYI, I wont be using the wireless connection from my main computer system. My computer will connect via a hard wire into the router (of the wireless variety), which in turn is connected…

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• Appropriate Network switch for small server cluster

  - by Chris Dutrow

  Need to build a small business server cluster for the purpose of crunching data. It will not host a web site that needs to be available 24/7. It does need to support servers that host Redis, a Cassandra database cluster, and a Python web server. Operating system will most likely be Centos 6.4 Other servers in the cluster should…

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• Switch Before Firewall / Router - Multiple public IPs

  - by rii

  I currently Have a 10Mbit Full duplex circuit connected to a small unmanaged switch which then connects to a Sonicwall Firewall / Router. I have several public IP addresses (/28) that are assigned to several devices in my setup. Now the problem is the small switch I have was lent to me and needs to be returned, I have replaced…

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• Do I need a Gigabit router with a 24MB/s down and 7MB/s upload speed cable modem?

  - by djangofan

  Do I need a Gigabit port capable wireless router with a 24MB/s down and 7MB/s upload speed cable modem? Does anyone know how to calculate this? FYI, I wont be using the wireless connection from my main computer system. My computer will connect via a hard wire into the router (of the wireless variety), which in turn is…

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• Is there a way to define a rule on a bridge that will return reply for ARP request

  - by user1495181

  client (IP = 1.1.1.1) - bridge (brctl) - server (IP = 2.2.2.2) (all machine are Ubuntu). The client block arp request. (there are multiple clients ) I need to define a rule on the bridge machine that will return the client MAC when it get ARP request for IP 1.1.1.1. I see that in ebtables there is an arpreply option ,…

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• What happens when ARP Request comes from a different subnet?

  - by gsinha

  What will happen when an ARP Request packet is sent from router1 to router2 in the following two cases? Will an ARP Reply be generated or the ARP Request packet be dropped? [router1]Intf1(20.0.0.1/24) ======== (40.0.0.1/24)Intf2[router2] [router1]Intf1(20.0.0.1/24) ======== (20.0.0.2/8) Intf2[router2] The topology…

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• How do I diagnose a bottleneck in an Intel Atom based Ubuntu server?

  - by Jon Cage

  I have a small media server at home which has software raid and a gigabit link to the rest of my network. For some reason though, I only get ~10MB/s transfers when copying to/from the server. How can I benchmark network throughput (Windows 7 desktop <- Ubuntu server) and hard disk performance to try and identify…

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• Unable to set initcwnd on a Hetzner server

  - by Sergi

  We just ordered a bunch of Hetzner EX40SSD servers with the minimal Debian install image that they provide and everything is just fine except that looking at tcpdumps for fine tuning the network from various locations the initcwnd param seems to be stuck at 6 no matter how we change it. By default Debian 3.2 kernels…

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• USB Device With Embedded Fileserver

  - by Richard Martinez

  I'm attempting to access logs from a proprietary hardware box with no reasonable hope of modifying the software. There is a process on the device to dump log files to a flash drive on the USB port after entering a code sequence. Currently, analysis of the logs requires the following: Physical presence at the…

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• Does using VLANs in your network infrastructure cause an appreciable decrease in performance?

  - by Peter Grace

  This is something I've never considered before and wanted the opinions of the experts. We use VLANs day in and day out for various network tasks. My modus operandi is that in general, if something supports VLANs, that port is getting trunked because it just makes a ton of sense if there's even the slightest…

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• How can I detect if a NIC is UP in UNIX?

  - by Rich

  I am currently writing a bash script (for Nagios), and I would like to be able to detect if specific network cards are up or not. My best guess is to do something like this: ifconfig eth0 | grep UP | wc -l or: ethtool eth0 | grep "Link detected: yes" | wc -l Are either/both of those reliable ways of…

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• Get the MAC addresses of all the machines connected to a LAN when NO machines have got an IP address yet

  - by JtheRocker

  Here is the real scenario. I have say 4 machines not having any IP address yet connected to a switch. In one of the machines (OS=CentOS), I would install a DHCP server and would provide the other machines IP addresses. Prior to assigning them IP addresses, I need to get the MAC address of each of the…

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• Why does no small Rj45 port exist?

  - by Christian Sauer

  While I bought my last Tablet I noticed that no Tablet (and most smaller notebooks /convertibles) has a Rj45 port. Which I finde quite dissatisfying since I like to use RJ45 in numerous places. I think a reason could be that Rj45 is simply too big for a Tablet - it is downright massive compared to…

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