Networking :: RHEL4 ES - Bond Two NICs For Redundancy For Upstream Connectivity?

Jul 15, 2010

I have several servers that we have bonded some NICs for rundancy and they will of course switch from primary to secondary NIC if connection state is lost to the switches they are physically connected to, but is there any way to be able to sense upstream connectivity (off switch) for each NIC and failover even though the NIC itself has a connection state to the switch it is plugged into? We are using Dell managed switches on VLANs with trunking.

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Fedora Networking :: Dual NICs And Internet Connectivity On F10

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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Ubuntu Networking :: AR5001 Chipset - Wireless Networking Randomly Loses Connectivity And Can Not Regain Connectivity

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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Ubuntu Networking :: Setting Up A NIC Bond With 4 Cards?

Jan 29, 2011

Got 4 onbards nics and would like to bond them into a single 4GB pipe. It is running a number of VM's. I can set up a link in my switch but I am stumped on ubuntu side. I think I have to make a file with entries but not sure where or how.

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CentOS 5 Networking :: 2 Bond Interfaces 2 Different Modes

Dec 7, 2010

I have 4 NICs and am trying to create 2 bonds. The first bond is mode 1, the second is mode 4. What happens though is makes both bonds mode 1. Here's my modeprobe.conf:

alias bond0 bonding
options bond0 miimon=80 mode=1
alias bond1 bonding
options bond1 miimon=100 mode=4 lacp_rate=1

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Networking :: HTTPS Through Upstream Proxy

Oct 4, 2010

I am running a Linux firewall (IPcop) to bridge two networks. Hosts on network A have to use a proxy server in order to get online. This server runs a transparent proxy (squid) configured to use the proxy needed to connect to the internet as an upstream proxy, therefore meaning all the hosts on network B can connect to the internet without the user having to configure a proxy address.

The problem is that HTTPS also has to go through the upstream proxy, which I'm told can't be proxied by my server transparently because of security issues. This means that hosts on network B can't currently access HTTPS sites.

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Networking :: Bonding Bond Running 802.3ad Dynamic Link Aggregation

Aug 20, 2010

Is it possible to bond an existing bond. I have 4 nics assigned to 2 bonds for link aggregation. ie

e1000g0 - bond1 - mode =4
e1000g1 - bond1 - mode =4
e1000g2 - bond2 - mode =4
e1000g3 - bond2 - mode =4

I would have presumed that you have 2 x agregates giving 2 x 2gig links and the resilience is that if one nic fails in either bond you carry on with that bond running a 1 gig link until fixed. But, our architect wants to have an active/passive (mode 1) accross bond2 and bond3. I have setup tons of mode 1 bonds and mode 4 bonds but never tried bonding 2 x mode 4 bonds!

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Networking :: Small Business Trixbox Setup With Redundancy ?

Apr 2, 2010

I have been using Trixbox CE for a couple of years and a client has asked me to setup a VOIP system with two phones and a couple of extensions. When he gets hit with a borage of phone calls I need to have the call that are behind the others to go the the next extension. I need redundancy if one Internet connection goes down and have the another kick in or failover. How does one configure Trixbox to failover to the other Internet connection and can someone give me a list of carriers in the Washington D.C area. Can someone point me in the right direction?

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Ubuntu Networking :: Streaming Wirelessly To PS3 - Upstream Caps At 2Mbps

May 30, 2010

Here's the setup I have:

Linksys wrt400n (wrt54gs same issue)
Laptop with wireless n nic running ubuntu 10.04 (all updates)
PS3 connecting wirelessly to linksys (all updates)

If I run PS3 media server on my laptop wirelessly,I cannot stream up more than 2 Mpbs to the PS3. If I connect wired, I have no issues.

I've checked quite a bit about PS3 media server and confirmed that upnp is turned off (and turned on in past, no change). Nothing I've done seems to resolve the issue.I purchased a new router recently and both it and the old g have this issue so I'm pretty sure it isn't the wireless routers. how I can trace down this 2 Mbps cap when uploading wirelessly?

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Ubuntu Networking :: Simple Dual Wan - Redundancy ONLY - Services Will Only Respond On One Interface At A Time - Not Both

Dec 22, 2010

I recently added a second interface to my Ubuntu 9.10 server, I now have a dsl AND Cable connection for it, Im not trying to load balance or anything sophisitcated, heres my problem.

The machines networked, I put static entries in my dhcp servers and both interfaces are up and live with dhcp, and Ive tried with dhcp and static, same problem occurs.

But my problem is that services will only respond on one interface at a time, not both.

Anyone know what the heck is going on here?

Kernel IP routing table

Should I make them static and remove both gateways?

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CentOS 5 Networking :: Bonding With 2.6.18-194.11.4.el5PAE - "bond Bond0 Has No Active Aggregator"

Sep 30, 2010

I have two servers that have been running link aggregation and VLAN trunking for years. I've installed larger drives in one and done a fresh minimal install. In spite of configuring as before the network will not come up. I did discover that a minimal install will not install vconfig which was causing one particular error when the VLANs tried to come up and this has been solved by installing vconfig. However, at this point the problem appears to be not bonding eth0 and eth1. /proc/net/bonding/bond0 indicates: "bond bond0 has no active aggregator"

If I put the old drives back in and boot the old OS everything starts up fine. I was even able to get it working with:

modprobe bonding
ip link set dev bond0 up
ifenslave bond0 eth0 eth1
service network restart

however, it does not survive a reboot. Is the a bug in the 2.6.18-194.11.4.el5PAE kernel or the network scripts? The the previous kernel I am running is 2.6.18-128.1.10.el5PAE For what its worth, these are the configurations:


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Networking :: How To Configure DNS Server & DNS Client In RHEL4?

Jul 5, 2009

How I am configure DNS Client and server in Redhat Linux 4 in my lab.I have total 5 computers and they are Lan connected.I want to make one of them server and the others are client.

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Networking :: Install Wireless Lan Driver In RHEL4 ?

Dec 19, 2010

I want to install the wireless lan driver in rhel4. I searched for the driver in internet, i got only Realtek rtl8185_linux_26.1031.1207.2009.release.tar.gz, how to install it in RHEL4.

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Networking :: 2 NICs In One Box On 2 Different Networks

Jun 5, 2009

I have attached a diagram to show the layout, but basically I have a server that has 2 nics. I use NIC1 for the server and its services. Im using VirtualBox to run VMs and want to use NIC2 for the VMs exclusively and I want the VMs on a different network completely from the host.Ive tried setting up NIC2 on the other network but I end up with networking problems on network1. Also I cant figure out how to tell VirtualBox to bind to the host NIC2.

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Networking :: 2 Nics In Same Subnet?

Jan 8, 2010

I have 2 x PCs and a NAS. Both PCs have 2x NICS. PC connectivity to Internet is via an ADSL router. Current config: Thus far (by choice) I've used static IPs in the 192.168.168.x range for my internal network, connecting all PCs and NAS via a jumbo frame enabled gigabit switch. This has facilitated moving data between the PCs and the NAS at high-speed. As both PCs also required Internet access from time to time, both are also connected to the ADSL router using the 2nd NIC and using subnet 192.168.1.x. I'm sure some of you are shaking your heads by now, but it works well and has been entirely hassle free.

However, I've an app running on the NAS that I'm keen to get Internet connected also. As my existing network devices are not using DHCP I figured the simplest method would be to change my ADSL router configuration such that it is in the same 192.168.168.x subnet, change its DHCP server settings to serve IPs in the same subnet (but in a restricted range I know won't cause any conflicts with the static IPs) and problem solved. On changing the ADSL router confiruration with all machines already booted up and configured as described above, everything worked. All devices could see one another, and access the Internet. On later rebooting the system this no longer works

- Internet access is fine but PCs don't see one another or the NAS. If I disconnect the ADSL Router from the PCs then all devices see one another again.

- Does having 2x NICS on a single device each assigned unique IPs in the same subnet create an issue and can it be overcome? I'd like to overcome it because making one of my PCs the gateway forces me to have it on anytime another device needs access.

- If I'm forced to use Internet connection sharing with one PC on the network connected to the router, how do I best configure this?

- One of the things I need to retain is gigabit connectivity between the PCs and PCs and the NAS (currently achieved by 192.168.168.x subnet being linked via gigabit switch).

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Networking :: Bridged VPN With Two NICs

Jun 4, 2010

My brother has a Ubuntu server attached to a LAN with Windows PCs. I set up an openVPN tun service on the server, let's call this VPN1, so that I can connect remotely from my Ubuntu desktop. The server has one NIC and the LAN has a router that is the gateway to the internet.

My brother would like to remotely access his windows network when roaming with his Windows laptop.

Therefore, I would like to set up a second VPN service, this time tap, that is bridged with his LAN. Let's call this VPN2.

The LAN subnet is The internet gateway is

The NIC has a fixed IP set by the router of

How do I set up VPN2 so as not to trash VPN1? That is, if I bridge eth0 with tap0 how will that impact VPN1's tun0 that is using eth0? Do I need a separate NIC for the VPN2 bridge?

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Networking :: Router Best Having Two NICs ?

May 27, 2010

I am considering moving to a software (ebox/pfSense/Zeroshell etc) based router.

It fits well to have 1 NIC connecting to your modem & the other to your switch & network. It seems to make sense it is more secure, but is it?

If I assign the 1 NIC in my router 2 IPs, a subnet for the modem and a subnet for the LAN, how is the different?

I can't think exactly what it is. I am no network guru and probably missing something down at a lower networking level, but for a home router, does 1 or 2 NICs make any difference?

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Networking :: Routing Between 2 Nics?

Mar 10, 2011

I have a pc with debian 6 (without GUI) installed on it and want to use it as server at home. It has 2 ethernet nics. Now i want to configure the routing process. Searched internet for a long time found something but couldn't get it work.

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Networking :: Assign 2 Different IP's To 2 Different NICs?

Jun 17, 2010

My server has 2 network cards. I have SLES 10 SP2 installed on this server. I had configured Ethernet bonding on this machine using 2 NICs. Now I want to assign 2 different IP's to 2 different NICs. I am able to do this without any issue using yast. ifconfig command shows that eth0 has and eth1 has Rest all networking details are same (netmask, gateway, DNS)

Strange thing: When I unplug only eth0, (eth1 is plugged in correctly) I am not able to ping any IP.
If I unplug only eth1, (eth0 is plugged in) I am able to ping both IP's.


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Networking :: Virtual Nics And Nat ?

Apr 25, 2010

My PC has 2 NICs Eth0 has 3 virtual NICs:

My every PC ( to has installed webmin and listen on port 10000

When browse from LAN .. it goes to the webmin page of .. why?

This problem ONLY occurs when browse the site from LAN! and it works properly if we access it from Internet.

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Ubuntu Networking :: Can't Get Any NICs To Work?

May 18, 2011

Ok so I'm gonna try and explain this easily. I installed 11.04 32bit on an older HP P4 machine. Boots up and goes to classic desktop.. But networking looks like a wifi devices rather than a wired connection. I installed another NIC rather than the onboard but had the same result.. I also tried yet another PCI NIC and a USB NIC with the same result. I also tried to set my connection to manual and give myself a static IP, but had no such luck.

I know my internet connection works because I'm on another machine typing this to you all.. All the NICs also work in W7 on the dualboot setup I did.

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Networking :: 2 NICs Permanently IP Address

Jun 15, 2011

I have 2 NICs on my ubuntu server.... eth0 has its IP address....but eth1 doesnt.

How do I assign an IP address to eth1 using only commands on the command line?

And I need it to be permanently...

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Networking :: DHCP And Static On 2 NICs

Jan 12, 2010

I have a MB with 2 NICs and on 1 I would like to have a static IP, on the other a DHCP for a local network.The problem is the DHCP provided gateway is made default vs the one for the static IP and resolv.conf is overwritten.Any suggestions how could this be resolved? I can tweak both the DHCP server settings and the box settings.

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Networking :: Route Packets Across NICS's?

Mar 11, 2010

I have two NIC's interfaces on my linux machine(eth1 and eth2). Each have different IP addresses(, These two interfaces are connected together through hub. Here is the my question?

1) If I 'ping', it should go out through network interface eth2 and through hub and enter on eth1 and response also travel through similar direction.

2) If I 'ping', it should go out through network interface eth1 and through hub and enter on eth2.

How can setup routing table for this,I have tried setting up routing and iptables, etc.. nothing helped.

If any one good router/networking guy, you should know this one.I am doing a project, I want this way to handle this.

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Networking :: Routing Between Two NICS On The Same Subnet?

Aug 2, 2010

I'm trying to work out how to route all traffic destined for the internet from all devices connected to eth0 to a wireless router access point via wlan0 on my Slackware box. I also have dhcpd providing ip addresses on the same subnet to any device connected to both eth0 and wlan0.


____________ ____________
[ ]=============> (wifi) ==============>[ Router / ]
|Workstations| __________ |Access Point|
[____________]==>(eth0)==>[ ]<==(wlan0)==>[____________]| Server |

If I connect to the router/access point via wireless or directly to the Server via a crossover cable I can obtain an ip address from dhcpd, so that works. As far as I can see I just need to how to route between eth0 and wlan0 then I can provide internet access to those devices!



eth0 Link encap:Ethernet HWaddr **:**:**:**:**:**
inet addr: Bcast: Mask:
inet6 addr: fe80::201:2eff:fe27:aea3/64 Scope:Link


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Networking :: Samba On Notebook With 2 NICs?

Jul 6, 2011

I currently have Samba working properly using the eth0 interface on my notebook computer. More importantly, I can browse the network and see the shares set up in Samba. If I disconnect and go wireless using the wlan0 interface I can no longer browse the shares on Samba via name. I can however browse via IP address of the wlan0 interface. How can I make it so that Samba is accessible by name when I switch between interfaces?


workgroup = startrek
server string = NCC-1701 Enterprise
bind interfaces only = yes


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Networking :: Split Traffic Over 2 Nics?

Feb 25, 2011

I'm running 2 asterisk box (Centos) ,and the two servers are connected through 2 iax trunks.on one server i have 2 nics ,each one is connected to internet,now i want to use isp 1 for the first trunk and isp 2 for the second trunk.

iax 1 is listening on 12345
iax 2 is listening on 11223

is there a way to split traffic on both nic using ports (netfilter iptables)?

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Fedora Networking :: Nics Reordered And Not Found?

Apr 12, 2009

I have a server that provides the access to the net. It has 3 nics 2 Realtek 100mb and a ne2000 isa 10mb card for the net. I ran an update from a working configuration on Fedora 9 to Fedora 10 with yum upgrade. Fedora 10 does not find the the ne2000 at boot time. After booting I can modprobe ne and the nic is found in a new network restart call. Has something changed how modules are loaded before udev runs?

Then there is the problem that nics are assigned the wrong interfaces(eth*). I have configured it in sysconfig with the files ifcfg-eth(0-2). I do not run NetworkManager. Has something changed in the configuration how the interfaces are assigned to the nics via the mac addresses?

I have tried to change the net profile of udev but since the ne2000 is not found at boot time but had no success. And one of the Realtek nics is not found at some times.

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Fedora Networking :: Both NICS Always Boot Up With Eth0

Feb 4, 2010

I'm using Fedora 12 on a box with 2 separate NICs in different subnets. The problem is that after a reboot, both NICs always show up as eth0 when you left click on the networking icon on the top right. I have to manually change one of them to eth1 & then things start working.

HWADDR=(mac address)


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Networking :: Two Nics Setup With No Bridging But Still Seem To Bridge?

Jun 29, 2010

I'm trying to setup a Centos box to act as a backup server for our intranet between stores. I have two interfaces in it, the first one is currently connected to my local network and is using dhcp to get its ip address and such, the second one is set to a static ip address and is connected to an independent network that just has a DigiBoard Portserver hooked to it and no connection to the regular network. What I am doing is using ssh to portforward the telnet port on this box to the main server so when you telnet into the box from the second interface using the portserver you get connected to the main server.

I plan on using this over DSL lines as a backup when our main dervice goes out to allow the portservers at the remote locations to seemlessly connect to the main server by just moving the network cable from the local net to the backup server. My problem is that when I have the everything working I am able to ping the second interface ip address from the normal network even though the secondary card does not in anyway externally connect to the network, this is a problem.

Eventually I want to duplicate the main server address so that the normal portservers and other terminals on the remote site will not have to be reconfigured to access the backup server. All I want is to be able to tell the managers is to switch a cable while the main connection is down and not have to manage a bunch of config files to get the store back up. Right now if I duplicate the main server ip address and it is accessible through the first interface I'm guessing I'll see all kinds of problems relating to duplicate ip addresses on the network. I've tried some routing and iptable stuff but I'm not real familiar with either so I had no luck. Is there someway to block the internal connection between the two interfaces so the only thing that sees the duplicate ip address is the second interface?

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