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.

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Can i configure each ethernet port to fixed and auto ip adresses?

Hi, i will be using a SSL Matrix Controller with Logic 9. This connects thru ethernet and requires a FIXED address. However, this Mac also needs to connect to the internet which doesnt use a fixed a address. Can I keep port one the way it is, and configure port two as fixed and have them both work properly? Are they completely independent of each ther?
Thx

Do you use a Router that you control?
If so, you can have fixed addresses easily -- just assign an address Manually that is in the same range, but above or below the ones your Router is likely to pass out automatically.
You can also assign a manual address to the second Ethernet port, but using it this way is complex. What does the device maker recommend?

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?
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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
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the rowid to both records. However I got the error.
Could you please give me an advice?
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Naoyuki

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.

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.

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.

Nexus 5596 Ethernet Port Configuration

I have a Cisco Nexus 5596 with 48 Ethernet Ports (two of which are now configured for Fibre Channel). It has a FEX attached to it as well.
I was able to configure ANY Ethernet port with the typical interface commands when in interface configuration mode. However, I can now only configure existing and new Port Channel interfaces, FEX ports and standard Ethernet ports that have never been configured before.
If I try to configure an Ethernet interface that was configured in the past, I only seem to have access to global interface commands when in interface configuration mode. I can set spanning-tree, duplex, speed or any other interface parameters. The CLI acts like I'm not in interface config mode, but the prompt shows that I am.
Anyone else seen such a thing? I am logged in as admin.

Hi Mark
I suspect the interface in question is configured to be in a channel. Once an ethernet interface is configured to be in a port-channel. most interface commands need to be configured under the port-channel interface
Thanks
-Prashanth

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

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

Trying to connect 2nd printer through Ethernet Port of AEX b/g

Hello all, Hello (maybe) Duane,
I do have a 2nd Airport Express b/g on our home network, and have a normal laser printer running as a wireless bonjour printer through that 2nd AEX, which is set up as a remote base station. I do have the Ethernet port free on that AEX, and want to connect a Brother 4040cn network ready color laser printer through the Ethernet port of this base station and use it as a bonjour printer? wirelessly... The AEX is set up as a remote base station to the main base station using WDS... I read a lot that the ethernet port only works when this station is in WDS mode - it is, but I still can't get it to work...
I talked to a guy at the Apple Store and he told me it should work, and that I somehow have to configure the Ethernet port of the AEX as a bridge so that could work.... ? It is not a supported solution (as expected...) so I tried to find that, but I am not able to work it out.
I can see the printer using the brother software, it shows me the status of the printer correctly, but I cannot get any printouts. The printing windows shows the printer, even lets me pick it as a bonjour printer, sends it off to the printer, but nothing arrives at the printer... I can use the web based printer management utility, which directly connects to the using the IP address, and can send stuff that is printed out, but i cannot get it working.
Hope that makes sense - anyone out there able to help?
Ningaloo

Hello,
If you wanted to setup a wireless network, you could look at some Wireless Ethernet USB adapters (will work just like the AirPort):
http://www.afterthemac.com/
Understand that the "AirPort" is just Apple's fancy name for Standard WiFi Networking. It's not anything special. Just Apple's implementation.
So, any WiFi Ethernet Adapter is going to be compatible with Apple's Airport network.
If you want to use the standard USB to Ethernet adapters, then you could look to see if you can find a suitable driver that will either enable your adapter (the one you just purchased) to work, or perhaps find an adapter that has a 3rd-party driver and then purchase that one. The following website lists Mac OS drivers that will enable "Windows-Only" adapters to work:
http://www.sustworks.com/site/newsusbethernet.html
The problem there, is that most USB to Ethernet (not wireless) adapters come only with Windows drivers. So, this website provides information and support to make those devices with with Mac OS X.
Otherwise, I have not found a pre-packaged USB to Wired Ethernet device that comes with Mac drivers.
But, the first website lists lots of USB to Wireless Ethernet adapters that come with Mac Drivers.
I hope this helps.
Let us know if you have other questions.
P.S., if you'd like, go ahead and click the "Helpful" or "Solved" buttons on any of the posts / replies above if you feel they were helpful or adequately answered your question.

How to configure the eth1 port of NIcRIO 9024 to another IP address and subnet mask

Hi ,
I am using cRIO 9024 and am planning to configure it to be an MMS server that interacts with a client which is in another network with different IP and subnetmask. I want to run the server VIs from the host computer via the eth0 port and want to communicate the MMS messages through the eth1 port. the eth0 port is configured as a static IP as shown in the screenshot attached and would like to assign a separate IP and subnet mask to the other port . But when I try to save the configuration I get the error "Could not save your changes tot he target.The subnet mask for eth1 is invalid" .
I have already directly cross connected the Crio and have disabled the firewalls and still am not able to configure it.
1) is it possible to configure the ethernet ports to have separate IPs corresponding to different networks and thus the subnet masks?
2) If its possible then what is the mistake i am doing while configuring it ?
I would be extremaly grateful to have a reply on this as its pretty desperate to spend a lot of time just to set up the IP configurations..!!!!!
Regards
Abhinav

Dear Abhinav,
I'm sorry but what you are tryining to do is not suported by the Second Ethrnet Port on any cRIO and so you getting this error meeage.
Here a abstract out ouf the KnowledgeBase How do I Configure the Dual Ethernet Ports on Real-Time Controllers?:
Ethernet port 2 is currently not supported to communicate outside its own subnet. There is no capability of configuring the Default Gateway for Ethernet port 2 and therefore cannot connect to a large isolated intranet. However, there appears to be a common misconception that this port can only be used for communication between NI products: this is not the case, though any communication through the secondary port must be within the same subnet.
Kind Regards,
SG3 | Applications Engineering | National Instruments | NIG |

Using separate ethernet ports for LAN and internet

Following scenario:
A couple of Lion clients and a Lion server connected to a switch. Switch connected to router for internet access. All devices, clients, server and router are in the same C-Class net.
I'd like to connect the Lion server with 2 ethernet ports to the switch, so that one port is solely used for connections to the Lion clients (aka LAN) and the other port is solely used for connections to the internet. That way heavy LAN traffic to/from the server cannot bog down internet access to the server. Any ideas how to acomplish that?
Usually you would configure the Lion server as a router and connect the Lion clients (via a switch) to one port and the cable modem to the other, so both ports are in different subnets. But I don't want all internet traffic from the clients going through the Lion server.
The best I've come up so far was to configure both ethernet ports with static IP addresses. The one connecting to the clients with a 255.255.255.0 netmask but no router IP given. The one for internet with a 255.255.255.255 netmask and the router IP set to my physical router IP. It seems to work, but I'm not sure, whether this is the suggested way to do such a setup.
Maybe some manual editing of the routing table is are more solid solution?
Any tips appreciated.
Pete

What you want to do can be done but maybe not the way you are trying.
First yes, you would use two Etherner ports on the Mac, if it is a Mac Pro or XServe it has two built-in, other Mac models can do this using a USB Ethernet interface.
Next, the way I would normally do this is to have a separate switch for the WAN router, this would make the setup look like the following
LAN Switch ----- Server ------------ Router --- Internet
       | |                             |
       | |                            NAT
       | +-----------------------------+
       |
       +------ Client Devices
The router could be doing NAT via one interface, or a separate Firewall box could do the NAT.
Another possible way would involve segmenting the lan switch by setting up a VLAN and putting one port for the Servers second Ethernet connection on to that VLAN (using public IP addresses and the a connection to the router on that VLAN, the LAN switch could then route between the two VLANs. Cheaper LAN switches do not have this ability.

Setting up dual ethernet on an intel macpro server

Hello. I am new to the server setup and was wondering....I am using an intel MacPro as a server with a 3.5TB raid. I am using the MacPro as a server, connecting to a 24-port SMC switch which will feed 15 workstations. The internet is through a local T-1. My question is this....How do I configure the Macpro to take the T-1 into ethernet #1, and then out of ethernet #2 to the switch and distribute it using the DHCP service in server admin? I know how to configure the DHCP in server admin, but how do I configure the Ethernet ports on the macpro so ethernet port 1 is the T-1 and ethernet port#2 is sending the T-1 to the switch? Sorry if I am confusing you, like I said, I am new to this. Hope there is some insight available. Tahnks in advance for your assistance.

I wouldn't recommend this because most people who do this have the 'server' running not just NAT, but probably their web site, a file server, maybe directory server, and just about every other server daemon they want.
If this server has one leg in the public internet and one in the private LAN you're leaving yourself open to exposing those services to external users.
It is not possible to use Apple's GUI tools to restrict all the file sharing services to the internal LAN only. It's also not possible to use Apple's GUI to block external traffic via the firewall. This means that, out of the box, any internet user could hit your AFP server, your directory server, and every other service you're running on this box.
It is possible to secure the box, but it means a) getting under the hood and controlling the various services manually and b) never using Server Admin again because it will likely undo all the hand-crafted configuration changes you made.
If you're fine with that, then go ahead. Most people aren't. So your options are to run only the NAT service on this box (which makes this box a VERY expensive NAT device), or leave yourself exposed.
That's why I say to use a NAT router to do that task. For $50 you get a box that designed for that task and will secure your entire internal network. You can use port forwarding to permit specific incoming traffic through to your server (so you can still do what you want), and you don't have to worry (as much) about what information on the server is accessible to the outside world.

Help configuring dual ethernet ports

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