Ubuntu Networking :: How To Connect To A Switch
Nov 5, 2010
I have an HP ProCurve 2424M 24 port switch and I can't access it through the browser because I can't find the IP address of the switchhave tried resetting back to factory configuration, but still can't find the IP. So I have a null-modem cable (serial) and am trying to get into the switch via the terminal. The only thing is that I don't know what commands to type? Do I need to configure the port? If so, how do I do that? I'm not necessarily a newbie to Linux, but when it comes to the terminal
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Dec 3, 2010
I have 2 HBA's in my system, in that one shows as READY state and the other HBA shows as DEAD state. I have asked the datacenter guys to to connect the HBA to another switch port and I rebooted the server. After reboot the second HBA came to READY state but after some time again it went to DEAD state.
Host adapter:loop state = <DEAD>, flags = 0x45a03
Is this the problem with the server or with the storage end
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Aug 6, 2010
I have 2 HP DL585 servers with Emulex fibre channel cards that were originally running RHEL 5.3 and 5.2 with kernel 2.6.18-92.1.22.el5 connected to a san.I have now patched these to RHEL 5.5, kernel 2.6.194-8.1.el5.The san team have moved the cabling from a standard san switch to a fabric san switch and I have tried to configure multipath.Since the cable move, the servers display 2 lines of:shpchp:shpc_init: cannot reserve mmio region then the boot halts with sda5 device or resource busy.
Returning the cables to the original switch and removing the multipath config allows the servers to boot. What is the shpchp error and is this causing the problem?Why would changing the switch the cable plugs into cause the server to fail to boot with the device busy message?Also, it's not easy to arrange downtime on these servers, so I don't know when I'll next have a chance to reboot them.
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Oct 7, 2010
I successfully installed Ubuntu 10.04 on 2 laptops (both are identical in terms of hardware). In addition, I connected both of them (using RJ45 cables) to a switch (just a switch; I don't have a router). Can anybody guide me what should I do / what settings should I specify in each laptop in order to be able to SSH from one laptop to another?
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Jul 28, 2009
Can the fibre channel switch in the centOS5.3 cluster edition be switched for a regular router or hub?
If so how would one do this? If not why does the switch have to be fibre channel?
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May 10, 2010
I have 2 NIC's in my mythbuntu 10.0.4 box, one is connected to a closed network eth0 and the other to an Internet gateway eth1.
For some reason Ubuntu always makes eth0 the default network card, even if I delete the connections and add them in different a order. Because of this I can't access the Internet w/o disabling the private network card.
I could just switch the cables over but this should be doable in software and I'd like to know how.
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Jun 12, 2010
My wireless (Toshiba laptop, 10.04 64 bit) is just hanging when trying to connect. It was working fine but now nothing. My Wireless antennae is on and my other laptop can connect with no problems. I have restarted the router and the laptop twice.
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Nov 2, 2010
I am unable to connect to wireless network in ubuntu 10.10.i have noticed that the iwlagn driver isnt been used by anything.
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Jan 10, 2011
in linux world and have recently downloaded and installed ubuntu desktop 10.10i cannot connect to both wired and wireless ethernet on my laptopit tries to connect but fails in 30 seconds , it says"disconnected" while i am able to connect to the same in windows i have broadcom 4315 and i have tried both fwcutter and ndiswrapper but the problem persiststhe device id is 14e4:4315
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Apr 6, 2011
I am trying to setup a dhcp server for my internal network. I have two NICs, a modem, and a wireless router. I have my server connected directly to my modem which is providing me with Internet access on eth1 and is working fine. I have dhcp and dns setup on eth0 which is connected to my router. The router shows that it is connected to the Internet but when the router gives a client computer an IP address, the client is unable to connect to the Internet but can connect to the router. I will post my configuration files below with my current configuration.
[Code]....
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Aug 8, 2011
I can connect to the internet through wifi, but I cannot connect to anything on my network. I have a printer and a NAS, so I would really like for this to work again. I have a dell laptop with a Broadcom card.
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Nov 9, 2010
how to make wifi work. I'm looking for a way to turn it off to save battery life. Aspire One D255, Fn F3 toggles wifi off and on, with an indicator light and, in Win 7, an on-screen indicator. Fn F3 doesn't work in Ubuntu, and there are times I'd like to turn the wifi off. Is there a command to do this?
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Dec 23, 2010
I got a Ubuntu machine running a local web server. It is connected to an archaic 10mbit hub, and I'd like a little bit faster network. I got a new 100/1000mbit switch connected to my router. I have 3 other PC's running off it, no problems at all. No configuration was necessary, and all existing cables worked fine.
Since the router and hub are located at the opposite end of the house, and the switch is in my PC room, I made up a new cable to connect it to my Ubuntu machine. It's just a straight-through cable, just like the other cables connecting the switch to other PC's. Okay so, when I plug the cable in to the machine I get no ethernet lights on either the machine nor the switch. But here's the kicker: I plug the cable into my laptop (running Windows 7), and it works perfectly. I restart the machine with the cable in, and get a green light. As soon as Ubuntu loads up, no lights, no connectivity. It shouldn't matter, but I'm running a static IP on the machine. I also have static IP's on the other PC's connected to the switch and nothing had to be changed.
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Jan 2, 2011
I just installed 10.10 on my HP dv2700 laptop and I can't get the wireless card to turn on. Here are some of my results. I get the same results regardless of which position the wireless switch is in and the indicator light always indicates that the wireless is off.
paul@paul-HLaptop:~$ iwconfig
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11abg ESSIDff/any
[Code].....
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Apr 2, 2011
I searched for this, and all I saw was advice on how to make wifi work. Mine works just fine, I'm looking for a way to turn it off to save battery life. Here's what I mean. Aspire One D255, Fn F3 toggles wifi off and on, with an indicator light and, in Win 7, an on-screen indicator. Fn F3 doesn't work in Ubuntu, and there are times I'd like to turn the wifi off. Is there a command to do this? Or maybe something in the menus that I'm missing?
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Apr 6, 2011
I am wanting to build myself a Linux based firewall and network switch but I am not entirely sure where to start. I would like to point out that I am aware that it would be easier and quicker to just buy a switch and use that, but this is an intellectual exercise.
What I want to do is have a NIC which has the internet coming in. The traffic is then passed through the firewall program (I think IP tables is what I should be using?).
Now my main issue is that I will have quite a few Network Interfaces to manage. The machine could easily assign IPs by DHCP and act as the DNS server but what would I need to use to share the internet connection to all the NICs? There will be at least 4 interfaces, but possibly up to 12.
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May 11, 2011
I am new with Linux and I am trying to figure out how to get my wireless working. My wireless LED does not switch on and it also does not work. In some threads I have seen people post some outputs of command from the terminal. I do not know how to copy this because I can not use ctrl + c in the terminal.
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May 26, 2011
I just installed Ubuntu 11.04, from Windows XP.
Ever since I have tried it, I can only connect to the internet on a wired connection, but no wireless.
It says "Wireless Connection disabled by hardware switch"
I'm not 100% sure what that means, has anyone else had this predicament?
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Aug 15, 2010
I had put my computer on standby and when i restarted it, it powered off within a few seconds. I turned it back on and after that i've lost connectivity to internet on Ubuntu 10.04.
However I have VMware (XP) installed and internet/network works on that. I'm a newbie with Linux.
Here are some outputs:
I have tried to edit the connection using System>Preferences>Network Connections. I entered manual settings for IPV4, but whatever i enter there, it doesnt get reflected when i type ifconfig in the terminal window. I tried setting it to Automatic DHCP as well. Doesnt work.
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May 3, 2011
I can not connect to wifi networks, i can see them but not connect.
My wifi device is:
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Jul 28, 2011
I have recently installed ubuntu 11.04 on my asus eeepc1005hab. And I've had problems with the wifi. I can connect via ethernet, but the wireless won't connect. I can see the connection, but my wifi never connects. I've tried many things but it still won't work.
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Oct 6, 2010
Server is on Port 1, with an address of 10.3.2.1.
Someone plugs into Port 2 and gives themself the same address.
That would cause problems, right?
So, is there a way, to say to the switch, "Hey, 10.3.2.1 is on Port 1, and nowhere else. Do not let anyone use the IP 10.3.2.1 on any other port, and if they do, disallow the traffic."
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Jan 13, 2010
I recently upgraded a server's networking card to a Gigabit NIC, and got a hold of a Gigabit switch (Here's a link) in the hopes of increasing my network performance - however, I'm getting around 10 MB/s throughput now, which is exactly what I used to get with the old 10/100 switch & NIC. The new switch recognizes both computers as Gigabit (the other machine has always had a Gigabit NIC), and both computers say they're gigabit - I've found various sites around the interwebz recommending tweaking some TCP/IP buffer settings, which I have tried to no avail. I also saw that hard drive speed is usually the limiting factor. According to "hdmarp -t", the server HDD (definitely the slower of the two) is:
Code:
Timing buffered disk reads: 226 MB in 3.00 seconds = 75.26 MB/sec
So that's obviously not my issue. The cabling is CAT6 - I ran it myself, but if I'd mis-wired the end connections, wouldn't it just not work at all? I admit, I bought cheap NIC's (I'm not going for like 124.9 MB/s throughput here..), and I didn't expect them to be stellar, but I certainly expected the speeds to improve. I'm moving files from a server running Ubuntu 9.04 to a Windows machine - I've tried both my Samba shares on the server and an SFTP transfer: they both have about the same throughput.
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May 19, 2010
I have my internet connection via a wireless USB adapter and that works fine. Recently I connected my pc (Ubuntu 9.10) through a wired switch to my modified xbox so I can watch my videos in my office. I can share my content with my xbox (except for the items on my external USB HD's - I am working on that and will post that question elsewhere) but when I have my PC's wired connection plugged into the switch I can not surf the web or check email. It gets stuck at resolving host and then times out. If I disconnect the pc from the switch it sometimes connects before it times out. Usually it is quicker if I reboot without the wired intranet connection.
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Jul 29, 2010
My PC is connected to an modem (DHCP) with IP 192.168.1.21 on eth0 Internet works perfectly I have installed an additional LAN card and configured it as eth1 with IP of 192.168.0.1 When I connect this LAN card to a LAN switch which in turn is connected to 6 other PCs, the internet stops working. As soon as I switch OFF the LAN switch, I am able to access internet. The IP addresses of the other PCs are configured as 192.168.0.2 etc. with gateway as 192.168.0.1 and DNS same as the DNS on the external interface. I can ping 192.168.0.1 from the LAN but neither LAN nor the main PC can access net. I was planning to Masquerade and NAT the other computers without using squid
My setup is as follows
ISP - Modem(192.168.1.1) - Ubuntu desktop 9.04(external interface eth0 192.168.1.21 & internal interface eth1 192.168.0.1) - switch - LAN (comprising of Ubtuntu 9.04, 9.10, 10.4 & XP machines with IP 192.168.0.2 - 8 and gateway of 192.168.0.1) I did NAT as per [URL]
This worked perfectly well 1 day Next day onwards whenever the LAN switch is "ON" the main Ubuntu wudnt get internet and the internet connection would work only when the LAN switch is turned "OFF". Even if all the PCs in LAN were to be switched off, the main Ubuntu would behave similarly i.e. internet would work only when switch isn't connected to it or switched off.
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Aug 21, 2010
I currently have a command line Ubuntu 9.10 installation.
I wish to be able to have either both wireless and wired connection working
For example: when LAN is connection the wireless is switched off, when LAN is disconnected the wireless comes up (WPA2)
I know that the Network Manager in Gnome does this auto switching for you but I need to know how to do this in command line only.
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Oct 7, 2010
How to do this?
Is it possible to manipulate the selection of network proxy through shell script?
to
What happens How to change the selection of "Default" to "Something" through shell script? What I am trying to say is, I have created a new location called "Something" with HTTP Proxy as proxy and port as 8080. If I am at my home, I use "Default". If I goto my college, I should change it to "something". How to do this via shell script?
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Oct 13, 2010
I am using 2 wireless network adaptors,one intel 5300 AGN (driver iwlagn)and the other one smc ezconnect ( driver zd1211rw), a usb adaptor The intel 5300 AGN has a hardware switch.
However, everytime i turn off the hardware switch of intel 5300 AGN, the smc ezconnect adaptor is turned off too. How to I prevent this(how to make 2 switch for 2 adaptors?)
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May 21, 2011
i hate to start a new thread that is already discussed in many places. But after hours and hours of digging, i am thinking there might be a 5 minute solution. But only if i know that. I own a lenovo ideapad y450. my networking controllers are...
Quote:
Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection
Broadcom Corporation NetLink BCM5784M Gigabit Ethernet PCIe (rev 10)
The problem is i cannot access wifi. The network manager says the wireless is disabled by hardware switch.
My hardware switch for wireless (on the laptop) is infact ON.
[Code]...
During natty installation (it was a fresh one) i had ticked for third party installations but had no internet running at that time. now the additional drivers under hardware in system settings shows nothing. just blank. NO MATTER WHAT I DID I HAVE COME TO THE FIRST STEP AGAIN. MY WIRELESS IS DISABLED BY HARDWARE SWITCH. where is this switch & how do i switch it on (if thatz so easy.) but all the solutions given in other thread were specific to some system or condition and mine somehow did not match.
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Jun 10, 2011
Just installed ubuntu 11.04. It told me a driver was missing and installed the Broadcom STA driver. I believe it went on line after that, but I restarted and its not going back online.
Also according to 'rfkill list all' my wifi seems to be hard blocked.
EDIT: also iwconfig outputs this:
Code:
lo no wireless extensions.
eth0 no wireless extensions.
wlan0 IEEE 802.11bg ESSID:off/any
[Code]....
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