Ubuntu Networking :: Dual Ethernet Networking - Lose Internet Connectivity?
Apr 18, 2011
I have a server with two ethernet ports. I configured eth0 to be static, set at 10.1.10.148. I plugged in another router into the other ethernet port in order to configure that router. I configured eth1 to use dhcp. Using /etc/network/interfaces rather than gnome network manager. When I did this, I lost internet connectivity (internet routes through eth0 of course)
- Why did I lose internet connectivity?
In order to recover internet activity, I had to disconnect the new router on eth1 of course, and do sudo ifdown eth1. That wasn't enough however. After rebooting numerous times and pulling out my hair, I finally tried configuring eth0 as dhcp, rather than static, and this fixed the problem.
- Why didn't sudo ifdown eth1 solve the problem? What information was saved between reboots that somehow remembered that I plugged in the new router? Because my thinking was if /etc/network/interfaces was identical, and the network topology was identical, after a reboot everything should be restored, but it wasn't.
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Apr 23, 2009
I've just installed Fedora 10 to basically work as a NAS for another machine - but also serve a couple of web pages. After having alot of issues with network manager (with it changing the subnet so nothing would work), I'm now almost there:
I have two network cards connected in the server:
1) eth0 connects to a switch that ultimately connects it to the net (on a 10.0.0.* network)
2) eth1 connects directly into another server for backups (192.168.0.* network).
Now when I setup eth0, I get network access can ping/ update/ surf the net - absolutely no problems, but when I connect eth1 in - the net dies and nothing works, I can ping devices on both the 10.0.* and 192.168.* networks, just nothing past the gateway. I presume this is either a route or DNS issue, but am unsure about where its falling foul - both the resolv.conf file looks fine as do the ifcfg-ethx scripts.
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Sep 7, 2010
I have an ASUS G50Vt laptop with Ubuntu 10.04 installed on it. I have a WiFi Link 5100 wireless device. I use these settings to connect to it:URL...My problem is, once I connect, within 30 seconds I lose my Internet connection. It goes on and off seemingly whenever it wants. Is there something I'm missing? Some kind of driver issue or something else I need to change?I can connect to the non-secure connections fine, just when I try to use the secure one it craps out. Halp?
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Jul 31, 2011
I use a Westell 327W dsl modem/router to connect to the internet. I installed Ubuntu 11.04 on two computers. My desktop is connected with ethernet and works perfectly. However, when I connect my laptop with wifi, it causes the router to lose it's internet connection. All connected devices are affected. The only way to fix the problem is to shut off and turn on the router again. This problem only happens with with the laptop and Ubuntu. I use the same laptop with Win7, and it connects fine. I also have no problems connecting my Android phone or PS3 to the router. The wifi in the laptop is an Atheros model.
I have tried no security, WEP, and WAP. The result is the same with all three settings. I can still access the router config from any device 192.168.1.1 after the internet goes out. The DSL led on the router stays on, and the config says the DSL connection is active.
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Jun 25, 2011
Wife's laptop has AR5001 Wireless Adapter laptop model is Toshiba Satellite A215
Problem : Wireless networking randomly loses connectivity and can not regain connectivity, the only apparent solution is a full power down , this is not even certain to work. The card works under Windows, she hates Windows. (I love her for this) I know it's not faulty hardware , because it will work for days on end under Windows without problems.
Things I've tried : madwifi drivers (any and all versions available) : These increase stability of the signal and seem to delay the inevitable however it still happens. When using these drivers the only option is to unload them modprobe -r then reboot then remove them again and re add them. It makes no sense why this works, and if I don't remove them prior to rebooting it will not work.
ATH5K drivers : These are pretty much junk, results are unpredictable at best, sometimes it will work perfectly for a few hours, sometimes it will not work at all. Nothing is repeatable, I can't seem to force whatever condition is causing this. rfkill does not show the wifi being blocked (hard or soft), unblocking it anyway does nothing, only way to make this work and it's iffy is to fully power down wait 5-10 minutes turn it back on and it MAY decide to work.
Firmware update : Updated the Toshiba BIOS to the latest version of the firmware 2.0 no joy here either. Same issue both sets of drivers.
Tried different distros and kernels : I've tried Mint 9, 10 ,11 ; Ubuntu 10.10, 10.04 , 9.10 and 11.04 (which is currently installed) , Fedora and OpenSUSE. All are giving the same problems. I have also tried a slew of different kernels no joy from any of them (I'm not at the computer with the issue now I will post exactly what kernel versions I've used when I have access to the machine).
Another useful bit of information, the hard switch to disable/enable wifi WILL disable it but turning it back on does absolutely nothing. The hotkey does nothing at all. The bios does not have an option to disable or enable the wireless card.
I will also post the typical lsmod , lspci , iwconfig all that good stuff when I get back to the computer in question. I'm probably just going to buy a PC card for it and give up on that one, but this is driving me insane and I would really like to see it resolved even if I do replace the hardware.
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Jan 23, 2011
I had my desktop running ubuntu 10.10 at my sisters house hooked up to a router sharing internet with her boyfriend never had a problem with it there. I moved into my own apartment this week plugged the cable modem directly into the broadcom ethernet card and couldn't get an ip or anything it wouldn't connect period so I ended up hooking it up usb which works but only at speeds of 5-7mbit when I have 15mbit connection. So I put another ethernet card in hoping it was just problem with the card and tried it that worked.
I got a connection but it was incredibly slow like getting maybe 5k a second so I open network tools in administration menu and start pinging google. While I'm waiting on a bandwidth test to complete and it takes off getting like 20mbit keeps that connection for a while then out of nowhere just drops to almost nothing. Again for a few minutes then falls off completely so I restart and it does the exact same thing starts off slow then something clicks and it works great for 5 min then nothing?
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Apr 21, 2010
I have an iphone, I am trying to get internet connectivity to that phone through wifi. I dont have a wifi router. But i do have a laptop with wifi card. I am connecting to internet via cable modem. In win7 I used to create an accesspoint and do the ics from ethernet card to share via wifi card. It used to work perfectly.
Now as I am sing ubuntu, i want to do the same. I have intalled firestarter, and shared the internet connection through wifi card(wlan0).After this I created an accesspoint using the gnome network applet. Now i can connect my ifone to ths accesspoint. But there is no internet connectivity in my fone.
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Mar 6, 2011
I was having trouble with some software detecting ports so i removed ufw and now have no internet
Ive tried and none of these work:
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Nov 9, 2010
I can connect to anything locally, I can SSH in locally but nothing works from outside my network (can't access pages in apache, can SSH, etc.) I've checked the logs I can think of, but what should I be looking for? The last thing I did today was add a FW rule to log and drop from an IP, saved my iptables to a file in /etc. (this was at 10:45am). The last time I successfully logged in remotely 1:03pm. I connected multiple times in between. I've rebooted remotely once or twice. That's it. I've already flushed iptables.
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Jun 20, 2011
I am new to UBUNTU. I installed the latest one alongside windows 7. I am having problem with the internet connectivity. I configured the static ip settings right I guess. Edited the Auto eth1 and assigned ipv4 settings manually and entered everything correctly.
Address 192.168.xx.xx
Netmask 255.255.255.0
Gateway 192.168.xx.xxx
DNS Server xxx.xxx.xx.x, xxx.xxx.xx.x
Do I have to put MAC Address as well? Which is addressed as 'Network address' in Windows where I put this MAC. I have on board Realtek RTL8101E Family PCI-E Fast Ethernet NIC (NDIS 6.20) Network adapter. Do I have to install the driver?
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Mar 3, 2009
I'm new to Fedora 10 and still a newbie with Linux in general. I installed F10 on an old PC I had....and the install went well..however, I'm having Internet Connectivity issues.
Here is what I did so far:
Did an ifconfig command and I have the following:
pan0 Link encap: Ethernet HWaddr D2:30:36:AF:61:95
inet6 addr: fe80::d030:36ff:feaf:6195/64 Scope: Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:30 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes: 0 (0.0 b) Tx bytes: 8676 (8.4 KiB)
When I go to the Network Configuration Panel I see the following:
Status: Device: Nickname: Type:
Inactive pan0 pan0 Ethernet
Tried to activate and it states Activating network device pan0, please wait... determining IP information for pan0.... A few minutes pass by then. It indicates it failed. Cannot activate network device pan0! I have disabled the Controlled by NetworkManger and enabled the Activate device when computer starts.
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Mar 12, 2009
On one of my F10 boxes yesterday, I installed several NM packages with yum update after being advised of their availability. Today, (the first reboot since installation) I no longer have network access on that box.
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Jan 12, 2011
Just installed Ubuntu 10.10 on dual boot computer. Each OS is on separate hard drive with GNOME selection between Ubuntu and Windows 7 Ultimate. Firefox was working fine yesterday when I went to use today, nothing. Email through Thunderbird is down as well.
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May 28, 2011
I just installed F15 on a laptop that previous had F12 working well. During install, it finds my wireless card and seems to set it up fine. The full install ran with the wireless active without any problem that I could see. Now, when I start up, I see Network Manager tells me that the wlan is active, but it doesn't show my specific network. If I click on the NM tray icon and open up the panel, my network is shown but it is not "active".
I can double click on it and it will become active - shows the little globe next to the antenna. This works fine for about 2 web pages worth and then FireFox 4 stops being able to find web pages. If I go back to the panel, double click on my wireless network (which looks like it is active already), and reactivate it, I can get the page I was looking for in FireFox, but within a couple of minutes it will stop.
Likewise with yum, while I'm installing software, I'll occasionally get errors like this:
[URL]: [Errno 14] curl#6 - "Couldn't resolve host"
If I reactivate my wireless network in the NM panel, it continues fine. Other computers/phones connected to this network seem to work fine. Is NM known to be problematic in F15?
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Feb 25, 2011
I'm on opensuse 11.4 (11.3 won't work with my monitor).
My computer gets internet through wireless and I want to share that internet through its ethernet port. So far I've tried using Knetworkmanager to create a network bridge between my wireless and wired connections. I created a new wired connection and shared it using the ip address settings. I was able to get both connections active, but the device hooked up via ethernet had no internet connectivity.
I also tried this command:
echo 1 > /proc/sys/net/ipv4/ip_forward
but another test resulted in the same fashion (no internet on wired). I believe anything I add to /proc should have an immediate effect, correct?
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Sep 1, 2011
In 10.04 I get the following error in the log while connecting to ethernet:
Code:
Aug 24 17:33:24 Linux dnsmasq[11069]: started, version 2.52 cachesize 150
Aug 24 17:33:24 Linux dnsmasq[11069]: compile time options: IPv6 GNU-getopt DBus I18N DHCP TFTP
Aug 24 17:33:24 Linux dnsmasq-dhcp[11069]: DHCP, IP range 10.42.43.10 -- 10.42.43.100, lease time 1h
Aug 24 17:33:24 Linux dnsmasq[11069]: no servers found in /etc/resolv.conf, will retry
Aug 24 17:33:24 Linux dnsmasq[11069]: cleared cache /etc/resolv.conf only has "Generated by NetworkManager" comment, so is this a bug in Networkmanager?
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Oct 22, 2010
I recently moved to a student dorm in my university (RWTH Aachen) and I have an ethernet connection from my room. The thing is that I can't connect to the internet, I don't get any IP through DHCP. I tried using wicd instead of network-manager, and doing it manually with dhclient. None of those worked (actually I don't know much about how networking works so maybe I didn't do it well with dhclient). The weird thing is that Windows 7 gets the IP instantly and I can connect to the internet from windows. But I don't know why Ubuntu refuses to get an IP. Info from lshw, lspci:
lspci
Code:
sudo lspci -vv
02:00.0 Ethernet controller: Marvell Technology Group Ltd. Device 4380 (rev 10)
Subsystem: Sony Corporation Device 905e
[Code].....
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Aug 17, 2010
My laptop was on windows xp and when I installed ubuntu linux my NIC Card driver was gone (I think) and now I can't connect to the internet using an ethernet. I have the driver on the desktop of my Linux laptop but I don't know how to add it using terminal or any other options.
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Dec 26, 2010
just recently I made the move back to Ubuntu from Windows. Upon re-installing I noticed a problem with me connecting to the internet. Previously on Windows I had updated my Ethernet Adapter driver, upon installing I would have to disable and re-enable the device to let my computer have access to the internet. My problem here is how would I go about fixing this on Ubuntu so I can have internet access on Ubuntu
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Jun 21, 2011
I am running Ubuntu 11.04 and i am curious to if there is a way to share my established wireless connection through my Ethernet port.. I know it was possible in Windows by going to adapters and bridging the wireless, and Ethernet adapters. how to make this work in Ubuntu?
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Jul 13, 2011
I am using Ubuntu Server version 10.4, and am trying to connect to the internet via an ethernet cable. This may and probably is incredibly simple, however, I could not find anything that pertains to it.
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Aug 5, 2011
After some fiddling around, I have come to the conclusion my current wifi access point hates my other computer's Broadcom chip or the drivers thereof. So, my current idea is as follows. I would like to use my netbook to connect to the wireless network, and then connect my other computer to it through ethernet. My netbook is dual boot XP and Ubuntu (think Ubuntu is a version behind) and I would be fine to set up this sharing in either and just leave it on as a repeater station. My other computer is dual boot XP and Fedora and I would prefer this work to allow me to have network in both. I have a straight-through cable and have verified that my network card supports the automatic crossing over behavior.
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Aug 7, 2011
I tryed to get network work like this share internet from wifi (wlan0) to ethernet (eth0).So the internet connection comes from the wifi and we share to other computer via ethernet[URL]But when I restarted my pc then it dont work and network says "wired network device not managed" How can I get it work aigan ?[URL]Now I have anohter problem when I connect autoeth then the wireless network dosent work anymore, I have to disconnect eth0 to have wirelles network working. how can I manage to get the bowh to work?
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Jan 13, 2010
I tried to setup sharing to connect Ethernet and wireless. I want Ethernet connected to desktop A, and wireless connected to another laptop(B), with my laptop acting as an AP. I set the network settings in Firestarter: Internet for wireless, local network for Ethernet. I want to share Internet from laptop B over the network. Internet won't work from my laptop since it seems to use the wrong interface.(Since the desktop is sharing Internet, although not on Internet usually when connected via Ethernet. And of course DNS/Gateway IPs aren't set for wlan0 since it's acting as an AP.) SMB wouldn't work for desktop A and laptop B: laptop B could detect desktop, but reports error "Path not found".
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Mar 1, 2010
I changed to a 4 port ethernet router (D-Link DSL-2542B Adsl2+)with intention to share Internet access with my brother (he's on Vista).Initially it all went well,but 3 days ago there were connection problems occured on the part of the ISP. Without realized the problem,I had reset the router.This morning I've been informed by the ISP that the connection has been re-established.So,I accessed the Internet via the 4 port router but failed to do so (server not found).Suspecting that the problem was from the 4 port router,I reverted to my old Adsl router (DSL-520B single port) and without any problem I managed to access the Internet back.I really need help to configure back the 4 port ethernet router to its initial state.
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Apr 30, 2011
Just recently got a new rig, and was wondering, is there a way to share internet via a switch. I understand the problems with switches is that they dont assign IPs like routers do, but if my ubuntu machine worked like a router by assigning IPs, could it work? Current setup is as such. I have one ubuntu machine with 1 ethernet port (this shall be the main preferably) 1 mac with a single ethernet port 1 modem with a single ethernet port that cannot assign more than one IP address. And a 5 port switch. Would it be possible to place the modem into the switch, get the ubuntu machine to receive the IP address, and broadcast all other address' to everyone else via the same switch and ethernet cable?
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May 4, 2011
I am using a cable modem wired to my PC via ethernet. My ISP is Road Runner, through Time Warner Cable.
I entered my IP address, Netmask, and DNS Servers into the network, not using DHCP. This was how I was able to achieve a network connection.
I am connected to the modem, but I cannot get internet.
Here are my stats:
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Jun 5, 2011
I am using ubuntu (11.04) here, when i connect Bsnl broadband link(wired connection). Internet is connect automatically But unable to instal, upgrad and access Internet pages ..
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Jul 24, 2011
I have two laptops (Dell & Lenovo), both have wifi.
I am having one wired Ethernet connection.
I want to share this Internet connection among two system , to access Internet from both the system.
I had tried by creating a wireless network, but was not able to do so.
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Jul 22, 2010
I have a wireless Internet modem (USB) and a LAN Ethernet connection. I can only pick 1 of them to connect to (by disconnecting the other). How can I connect to both at the same time?
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