Dual Ethernet Ports

My server has 2 ethernet ports. Is there any advantage to having both of them connected to the switch? If so, how do I set it up for best throughput?

Actually yes there is. You can bond those two nics together to form one logical link. Of coarse the switch your using needs to support Aggregated links as well as your os. In most cases this is quite hard to setup and can actually hinder performance if setup incorrectly. If done correctly will add more throughput and have a layer of failover capability such as to another core switch in your network.

Similar Messages

Creating Dual Ethernet ports and separateing Internet vs. LAN

I have a situation in a shared office where I would like to be on the LAN so as to be able to share files and peripheral equipment such as printers, but I would like to have my own dedicated highspeed DSL service instead of what is provided and shared by the rest of the LAN. What is the best way to go about this?
Can I install a second Ethernet card in my G5 and have the connection from the DSL modem go directly into that port? If so, how would I tell the computer to use that port for Internet instead of using the other used for LAN? I mean since technically I would have dual Internet services coming to my machine (one through my LAN and the other through the secondary Ethernet port) how could it know which one to access?
PowerMac G5 Dual 2GH Mac OS X (10.4.6)

Also, as a follow up question, can I use any Ethernet card or are there Mac specific one that I need to get?

Question with regard to dual ethernet ports

First let me say that I am a novice at networking, so this may be a stupid question. I had my network plugged into on of the ethernet ports and was unable to access a forum I visit. I could access most every other website, but not this particular one. I switched the ethernet cable to the other port and the problem resolved itself. Why would I be able to access it from the one port and not the other?
G5 quad core Mac OS X (10.4.6) 1 gig of Ram

Hi Jaya,
Thank you very much for your correspondence and I am very sorry to
mislead you.
What I would like to do is to link an existing partner record with
an existing lead record. Since both records already exist, I set
the rowid to both records. However I got the error.
Could you please give me an advice?
Thanks,
Naoyuki

Dual Ethernet Ports, and Air Port Wifi

I have a early 2008 and 2009 Mac Pro and was wondering if there was a way to connect both ethernet ports and the airport wifi as one "adress" so i would essentially have 3x the bandwith for downloading/uploading, etc.
This is in both Snow Leopard and Win XP Via Boot Camp

You might start by reviewing this thread and associated links:
http://www.insanelymac.com/forum/index.php?showtopic=57382.
Apparently it should be possible to link the ethernet ports together but not the wireless.

Help configuring dual ethernet ports

We have a Linksys router doing NAT/firewall and its connected to the WAN. . No DHCP server is running. It has an internal IP of 192.168.16.1 / 255.255.255.0. It plugs in directly to a Linksys business series switch.
I have an intel xserve with dual nics and no idea how to configure them, but I want the server to handle AFP/DHCP/DNS, while a G4 handles mail.
My assumption was to give en0 this setup:
ip: 192.168.16.5
subnet: 255.255.255.0
router: 192.168.16.1
dns: isp's numbers
en1:
ip: 192.168.10.1
subnet: 255.255.255.248
router: 192.168.10.1
dns: 192.168.10.1
Is this setup correct? Because I can't get it to resolve correctly even though I am using a FQDN

I should also add that our website is being hosting externally with a private hosting company. However, we want to host our mail internally on the G4.

Dual Ethernet Ports + Dual ADSL2 = Please Help!

I was told it might be a good idea posting my little problem in here with the hope of a response as it's a little complicated. If you can spare a few minutes I'd greatly appreciate it if you could have a little look here:
http://discussions.apple.com/thread.jspa?threadID=945463&tstart=0
Many thanks,
Colin

Hi Camelot
Ah I see. I'm using a Draytek 2910.
http://www.draytek.com/product/DualWan_SecurityRouter/Vigor2910.php
You can check-out the control panel live DEMO here:
http://www.draytek.com/demo/Vigor2910/index.htm
I assume what I need to do is use the Load-Balance Policy feature under the WAN menu item to set up a list of rules. Could I, for example, have all connections to exampleproviderA.com (10.11.12.13) routed through WAN1 (ie my ADSL connection 1) and have all connections to exampleproviderB.com (20.21.21.23) routed through WAN2. I assume a rule like this would stop accidental requests being sent from the wrong IP?
Have I got this right?
Many thanks again,
Colin

How can I configure one of the gateway NI9792 Ethernet port to communicate with a cRIO PAC ?

Hi NI Engineers,
I intend to use my gateway NI9792 the following way:
1. One Ethernet port for network connection. That's how I'll develop it, download software and monitor my application through my PC at my desk.
2. Can the other port be used to communicate with a cRIO device? If so, how can I do it?
It seems to be a stupid question, but I truly could not work this out!
Thanks in advance,
Luiz
"Together we stand, divided we fall..."
Certified LabVIEW Associate Developer
Solved!
Go to Solution.

Good afternoon, Luiz
Follow the first link to guide which module can be used and other links to the best part of bore configuration CRIO. Any questions please contact us.
How Do I Configure My Time Server on the NI WSN-9791 or NI 9792 Gateway?
http://digital.ni.com/public.nsf/allkb/44FA322FAFF8D58D862575BD00591A54?OpenDocument
NI WSN Product and Configuration Guide
http://zone.ni.com/devzone/cda/tut/p/id/8710
Configuring the Dual Ethernet Ports on Real-Time Controllers
http://digital.ni.com/public.nsf/allkb/67F94BB93BCE32CF86257367006B3659?OpenDocument
video setup and installation CRIO
http://www.ni.com/swf/demos/us/crio/outofbox/
Automatic Network Configuration for cRIO-9073 and cRIO-9074 CompactRIO Controllers
http://digital.ni.com/public.nsf/allkb/37C790309A210A748625757000570938?OpenDocument
Sincerely,
Mauro Vera.

RT: How do I use two independent Ethernet ports?

I have looked around at the forums and seems like no one has had a real solid answer or example on how to use 2 Ethernet ports with RT.
Right now I have two connections configured on the RT:
Primary Connection:
IP:192.168.2.181
Subnet mask: 255.255.255.0
Gateway: 192.168.1.1
DNS Server: 192.168.1.1
Secondary Connection:
IP:192.168.1.180
Subnet mask: 255.255.255.0
Gateway: 192.168.1.1
DNS Server: 192.168.1.1
After using this initial setup, I made a RT project where I used 'UDP Open' for both 192.168.2.181 and 192.168.1.180, and had them both read and write in a sequence (Read and Write for the 2.181 connection, then Read/Write for 1.180).
The computer I'm using to send the data is connected to a switch, which in turn is connected to the RT. Both the RT and my host computer have 2 ports, one of them with ports configured to be 192.168.2.x and 192.168.1.x
Using this configuration I get some weird results:
If I send a packet to 192.168.2.181, I receive it from the UDP Receive vi that has an input connection from my UDP Open assigned to 1.180. I also receive the data the same way when sending packets to 1.180 (as expected). Basicly, no matter what IP I'm sending it to on the RT, the data from either packet will arrive from the same location/vi.
Why is this? Is there anyway to fix this? Did I not configure something correctly?
Does anyone have an example of dual Ethernet ports actually working with LabView RT?
I tried checking out "KnowledgeBase 3VQ6278T: Can I Use Multiple Network Adapters in a PXI or Desktop Real-Time System?", but after following the link to the page, I get:
"Error You are not authorized to view this document". Can any NI people look into this?
Having to make two IPs with different subnet masks obviously just makes things unnecessarily complicated. Can anyone tell me why LabView/NI did this? I know for a fact this isn't a limitation in hardware.
Any help would be greatly appreciated, thanks!

Hey Weizbox.
Sorry to hear you're having such a difficult time using multiple ethernet devices with RT.
Let me go ahead and get the easy stuff out of the way, the link you
have is dead because it's archived (and thus removed forever) though
unfortunately the link on ni.com wasn't corrected to point to the
following resource, which the KB was a word-for-word duplication of
(which is supposedly why it was removed):
http://zone.ni.com/reference/en-XX/help/370622C-01/lvrthelp/configuringdual/
Unfortunately, though, it's much less useful than it sounds.
Before you start feeling like a woodpecker in a petrified forest, lemme
fill you in on why the requirement is there for the two ethernet NICs
to be on seperate subnets. Simple enough, it has to do with the
network stack on both of the operating systems used for LabVIEW
Real-Time - however, the same falls true for even Windows (without
using fancy vendor-specific drivers), so let's not be too hasty.
Neither PharLap ETS nor VxWorks, the two OS's used under the hood,
support redundant network ports. Because of this, if you give two (or
more in the case of PXI and RT Desktop) ethernet devices IP addresses
on the same subnet the routing tables in the network stack get horribly
confused and literally cannot resolve the proper adapter, which either
brings down the ethernet on the entire system or makes it such that one
or more network adapters becomes useless and one adapter takes over all
network traffic (there's no way to predict which adapter that will be,
nor can you control it based on what's plugged in and what's not). On
Windows this is handled by bridging the adapters, but RT does not yet
support bridging (that opens a whole nother can of worms). Long story
short, you still wouldn't be able to give both NICs individual IP
addresses on the same subnet.
Let's take that even one more step. You cannot simply just assign both
ethernet NICs different IP addresses on "virtual" subnets, you actually
need to put both NICs on literally different subnets for the network
routing to actually work. Multiple ethernet devices for LabVIEW RT
were designed with the following mantra in mind - "The FIRST ethernet
device is designed for a TCP/IP network, the SECOND and SUBSEQUENT
ethernet device is designed for OTHER protocol uses." By "OTHER
protocol uses" I mean the second NIC should be used for RT
Deterministic Ethernet (PXI, RT Desktop, et. al.), direct connections
with other targets, and 3rd party or custom ethernet protocols.
Now, realistically, we can't expect users to not use the second NIC for
TCP/IP use, nor should we. However, if you ARE going to use TCP/IP on
the second NIC, you should only use the second NIC for connecting to an
unroutable network in the eyes of the first NIC. So, for instance, the
FIRST NIC can have an IP address of 10.0.62.128, but the SECOND NIC
would need to have an IP address on 192.168.100.23 - and the
10.0.62.128 should not be able to route a TCP packet to the 192.168.x.x
network, and vice versa. In your example I noticed that both networks
used the same Gateway - unless your Gateway is configured to identify
and seperate the two networks, it's not going to end well, and you
shouldn't expect to be able to send data from one NIC to the other NIC
(at least with what you know now). To reiterate, using multiple NICs
using TCP/IP should only be done in cases where you've got (n-1)
isolated subnets, where n is the number of NICs you have using TCP/IP.
A classic example of this is a command-based measurement environment;
the RT system uses the FIRST NIC to talk to a TCP/IP network, in order
to transfer data or provide status to a network, and the second NIC is
connected to a TCP/IP network designed specifically for measurement or
control, where one node sends commands to a single or multiple nodes on
the network at once to perform tasks (like "Take a Measurement", "Stop
a motor", "Bake me a Pie", etc...). The isolated TCP/IP subnet is free
from "random" TCP/IP traffic (especially system announcement
broadcasts) and can have whatever topology/configuration it wants. The
dual networking allows the RT system to work/communicate/perform on
both networks.
I hope this helps shed some light on your situation.
Cheers!
-Danny

Problem with two ethernet ports?

There is little consistency to this, but I'm wondering if anyone else has a similar problem. I upgraded to 10.6 on my Mac Pro. I have two ethernet connections which run concurrently in my network setup - one internally addressed, using a manual IP with DHCP, the other an external address with a static IP. On an inconsistent basis, opening pages in Safari will result in failures because I am apparently not connected to the internet, despite the fact that I am - Mail continues to work fine, server connections remain, etc., etc. The only way to get Safari to work again is to disable one of the ethernet ports. Reenabling it after I have successfully made a Safari connection does not then break the connection again - it keeps running for quite a while. The problem seems to become more apparent when I open a selected group of links into tabs - some will be successful, most will fail. Ideas?

Snoop Dogg thanks for the reply.
Port ONE was set to auto DNS. I did exactly as you suggested, I even tried a to do a manual ip address, etc but no luck. What finally worked is, I moved the port one cable to port two (which was empty) and bingo it worked.
It seems that snow leopard may have some issues with dual ethernet port machines, but why port two worked and port one didn't is beyond me. I will try to reverse it back to port one and see what happens. Fortunately I don't need two port at this point.
Cheers, Terry.

Dual Ethernet Interfaces with a Single MDIO

Hi,
I am designing a Zynq 7020 board with dual Ethernet ports, one routed via MIO and the other via EMIO.
1) Can I use a single MDIO interface for both Ethernet ports?
2) If so then :
1) which one should I use: MIO or EMIO?
2) How are the two Ethernets addressed?
3) Are there Linux issues I should be aware of?
Thanks

hello my friends ,have you soloved the problem?

Dual ethernet query - any point?

Hi,
I've got a Mac Pro and have a spare port available on my modem/router so could plug another network cable into the ethernet port. I don't fully understand the benefit of having the two ports, certainly not for a home user. Could someone explain if have two connections would help me, or its it overkill for your basic home network?

Not sure if this helps or makes sense to anyone, but one use I have found for the dual Ethernet ports involves using Parallels with the following setup:
(1) Connect each port on the Mac Pro to a switch and/or router/switch. You can obtain a different IP address for each port via DHCP or, if necessary, statically (use Preferences -> Network). The port labeled 1 is device en0 and the port labeled 2 is device en1, as easily verified with /Applications/Utilities/Network Utility -> Info. (By the way, if you have Airport Extreme installed, it is assigned device en2.)
(2) Using System Preferences -> Network, assign Built-in Ethernet 1 highest priority (using Network Port Configurations). Then, your Mac Pro will use this port and IP address as its primary internet connection.
(3) If using Parallels, you can assign the en1 (i.e., Built-in Etherner 2) port to the Windows network adapter using the Configuation Editor -> Network Adapter Options -> Bridged Ethernet and select en1 (or you can share en0 or use Airport Extreme, en2, if you have it).
(4) This configuration will give you independent simultaneous network connectivity on your Mac and on the Virtual Windows machine (Parallels), each with its own separate IP address, and ability to (depending on your router's configurability) enable/block certain ports, as one example.
Hope this helps,
Stu

Using both Dual Gigabit Ethernet Ports

Using both Dual Gigabit Ethernet Ports
If I plugged both of my ethernet ports into my LAN switch, that would double the bandwidth to and from my machine. A switch does not used shared bandwidth like a hub does. I realize that it won't speed up any of the other devices that are plugged into the switch. Regardless, I would have the capacity for double the bandwidth to my machine.
All LAN cables are CAT6 and the switch is 10/100/1000.
The question is, would Mac OS X 10.4.7 utilize both ports (soft of the way it uses multiple processors)?

It's easy to try... it's call "Link Aggregation"...
http://docs.info.apple.com/article.html?artnum=304120
You get to it by Network>Show>Network Port Configurations>New then Port in the popup, then you schould see Port Aggregation. Selt the two ports you wish to combine.

How can I get on the internet with my newly purchased used G5 Power Mac if my ethernet port failed?

We just bought our son a used G5 Power Mac, but when we got it home and tried to hook it up to the internet, no luck. We changed ethernet calbes, tried plugging directly into wall cable (by-passing router), even tried to do manual config, but no luck. I took it to the Genius Bar today and they said the ethernet plug was broken, and they did not have anything for a "vintage" machine like this.
The Genius Bar tech told me to buy a USB Network Adaptor, however no one (Best Buy, Radio Shack, even searched the internet) seems to have them for Mac. What can I do to get this puppy connected to the internet and how much would it cost? Did we get screwed?
Here is the seriel # + info that the seller gave us:
Seriel # G8******QPM
Mac OS X 10.5.8 (9L31a)
< S/N Edited By Host >
The Powermac G5 Dual Core 2.3 is powered by a "dual core" 2 GHz PowerPC 970MP (G5) processor with dual optimized AltiVec "Velocity Engine" vector processing units (one per core), four double-precision FPUs (two per core) and a 1 GHz frontside system bus. It 's configured with 4 GB of DDR SDRAM, a 160 GB (7200 RPM) Serial ATA hard drive, a 16X dual-layer "SuperDrive"
Connectivity includes USB 2.0, FireWire "400" and "800", Two DVI port, optical digital audio in/out, two independent Gigabit Ethernet ports. All of the "multiple core" equipped Power Macintosh G5 models have three open PCI-Express (PCIe) expansion slots. The Power Macintosh G5 Dual Core 2ghs uses an easy-to-upgrade "anodized aluminum alloy" case with a removable side panel for easy access to internal components. Likewise, it is divided into four different thermal zones with nine computer-controlled fans for optimum cooling.

Sorry, the 2ndlink should be...
http://eshop.macsales.com/item/NewerTech/MXP2802NU2C/
Fully Mac OS X supported with with on-screen
menu set-up and full user manual.
http://eshop.macsales.com/item/Asus/USBN10/
OS Support Mac 10.4/10.5/10.6
I don't have those exact models, but have seen others here use them.

I need to tell Print services to use the 2nd ethernet port

I need to tell Print services to use the 2nd ethernet port
Thanks in advance to anyone who can shed some light. My research has led me to a dead-end so far. Running 10.3.9 on my server. XServe Dual 2.3
I want to have File services and the various other duties pushed through one ethernet port, and print services on the other. I know there is probably a config file to make one simple edit, but I can not find it, or perhaps a "defaults" type command.
Also, where is this "command-line administration guide" that I keep running across on Apple's support?
Thanks in advance.
Matt

Similar issue here too. Is it the subnet? Basically, I'm having a problem printing to an AirportExpress-served printer. Our network looks like this:
(From Outside...>>>...to Inside)
(Public IP) DSL Modem
...(10.0.0.x) Airport Express -- HP DesignJet 100 USB -- Airtunes/stereo
...(10.0.0.x) NetGear Wireless Router
...(10.0.0.x nic 0) Mac OS X Server (192.168.0.x nic1)
......(192.168.0.x) Mac OS X client
......(192.168.0.x) Mac OS X client
......(192.168.0.x) Mac OS X client
The printer driver does not appear to be able to do IP printing, it assumes a direct USB connection. We can setup the OS X Server with the printer served by the Airport Express, as it is found via Bonjour, and then we share its queue via Server Admin. The problem is that the LAN clients cannot print to this server queue. The printer gets stopped at the server.
If we turn OFF the OS X Server's firewall, printing works from both the clients and obviously from the Server. I think my question is this: what ports or services need to be turned on in order for the clients to print? There is no clear checkbox for "Bonjour Printer Sharing", and I'm curious what ports this would open, and if it would be safe. I thought it would work because we're pushing the print job up through the firewall, but apparently some response needs to come back through the firewall, and that's what's not happening.
And to tack onto this, how could we also push iTunes to the Airport Express from the Clients? Assuming the music goes over different ports than the print jobs. ?
Thanks in advance for any help.

W500: Dead Ethernet Port

Today my ethernet port stopped working. While Linux can see it (I'm running a brand new install of Linux Mint 14), and it appears to attempt to connect, I cannot acquire an IP address and connect to any network. I've verified that the ethernet cable works just fine, and the ethernet does not work either with a live CD or in Windows (I had beed trying to set up a dual boot, but give up and went Linux-only when I couldn't get Windows 7 to connect to the LAN, erroniously thinking it was a driver issue). What can I do? The wireless on my college campus is absolutely terrible; it's likley going to take three hours just to get my fresh Linux install up to date. I don't have the money for a new computer at this time.

It looks alright. It was going into an infinite loop of trying (and failing) to get an IP address. Ironically it started working again when I got back to my room. I wonder what it is about the network in the applied CS labs that my laptop hates, since the same cable/port on the wall would work fine for other computers.

Dual Ethernet Ports

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