IP Address with two NICs

LabVIEW 7.0
  I have Win2000, my client has XP Pro.
  My program, as a convenience, displays on the front panel the IP address of the machine it's running on. This is so he can enter this address in another machine and communicate with it.
  I'm using the STRING to IP function (input unwired), and the IP to STRING function to display the number.
  My client has TWO NICs installed - one for data acquisition (we are collecting data from Ethernet machines in a test cell), and another for general traffic (printing, inter-cell transfer, etc).
  We discovered recently that the program was displaying the local IP number (192.168.x.x), which is the DAQ net. This is not the one we want.
  So I found the MULTIPLE OUTPUT option on the STRING to IP function and turned it on. I used an INDEX ARRAY function to pick out address #1 (not #0) and display that. That works fine.
  My question is: how do I know that #1 is the right number to use? This app will be deployed on a bunch of machines, will the local be Net #0 on all machines? Is that a system config issue? Do I need to tell him to configure a control panel somewhere a certain way? Do I need to read both addresses and display the one that does NOT start with "192."? How do I make this bulletproof?
Steve Bird
Culverson Software - Elegant software that is a pleasure to use.
Culverson.com
Blog for (mostly LabVIEW) programmers: Tips And Tricks

Hi CMB,
There are several approaches to this. Some less favorable to others... such as at one extreme: to identify with a label which NIC goes to what network....
However, to keep automation... "automated", how about the following:
Since you can automatically detect each IP address, you can then implement a small test to "self-discover" which IP (NIC) talks tho which network. For instance, you may want to ping a known static address, such as a mail-server to discover that it is part of the WAN and not the test network. You may also prefer to ping by host name just in case the IP address of that machine changes. In the event that you do not know any IP address or host names, you may try to ping something outside the LAN (over internet for instance), something that the test network could not reach (your own website for instance??).
Would you be autodetecting on an ongoing basis (ie. every day) or only during equipment setup and configuration?
Ray

Similar Messages

RMI uses incorrect InetAddress on machine with two nics

Hello All,
RMI registry and server run on the same host. Host has two nics, one assigned for private network (192.168.x.x) and another for global.
For the sake of creating RMI registry I use the global one and specify it as four dot-delimited numbers instead of machine name:
Registry registry = LocateRegistry.getRegistry("xxx.xxx.xxx.xxx", rmiPort); // "xxx.xxx.xxx.xxx" is global IP addressInvoking a method with just a port as a single parameter causes RMI to bind to the private address, so I avoided that trouble by using numeric IP.
Remote client is able to locate the registry and extract the stub from it now, but ironically retrieved stub contains private address inside.
Debugger shows that the proxy stub contains TCPEndpoint which resolves to 192.168.xxx.xxx:yyyy
I am exporting the object on the server side by using UnicastRemoteObject.exportObject(myObj, 0) method.
Unfortunately, there is no method which would allow to specify the InetAddress to bind the object on.
I've seen the battle on page [Remote Method Invocation (RMI) - Why does RMI server sets its connection address?|http://forums.sun.com/thread.jspa?threadID=5366985].
Close questions are discussed, but I haven't found answer on my question.
Is there an ability to specify the address when exporting the object?
Or any workaround to let the client retrieve the proper stub which can be used to send requests to the server?
Thank,
Alex.

For the sake of creating RMI registry I use the global one and specify it as four dot-delimited numbers instead of machine name:
Registry registry = LocateRegistry.getRegistry("xxx.xxx.xxx.xxx", rmiPort); // "xxx.xxx.xxx.xxx" is global IP address
That doesn't create a registry. It just returns a stub to an existing registry.
Invoking a method with just a port as a single parameter causes RMI to bind to the private address.No it doesn't. It causes RMI to construct a stub using "localhost" as the hostname. If this maps to the private address via your /etc/hosts file or DNS, so be it.
Remote client is able to locate the registry and extract the stub from it now, but ironically retrieved stub contains private address inside.Nothing ironic about it. The stub doesn't know where you got it from. The address inside the stub is controlled by what "localhost" resolves to in the server JVM. If it resolves to something inconvenient, either change that or set the system property java.rmi.server.hostname to the desired IP address or hostname in the server JVM.
Unfortunately, there is no method which would allow to specify the InetAddress to bind the object on.You don't normally need one, see above, although in pathological cases you could use an RMIServerSocketFactory, which does give you that ability.
I haven't found answer on my question.See also the RMI FAQ, item A.1.
Is there an ability to specify the address when exporting the object? See above.

Leopard server 10.5.6 with two nic card and two hostname

Hi,
Here is what I am intending to do but don't know how:
-setup a Mac server that has 2 built-in nic.
-nic1 is setup as a DHCP, has proper hostname, DNS, etc. and connects to internet and is easy when you configure it as a server while is connected.
-But, my other nic2 is not DHCP and is cut off from outside and is intended for internal research, but given a proper IP and hostname.
If I want to install the server, then without internet connection it is hard to complete the setup and If I do then it assigns the hostname pointing to the nic1 (which i don't want)
How should I go about this? I tried both way, but Mac picks the hostname that is associated with nic1 always.
Any help is appreciated!
Thanks

Can you do what you want? Sure. (If I understand what you're up to.) But it gets a little ugly.
It's easier to use a firewall-router-NAT device here.
Dual-NIC configurations and IP are an interesting case.
A firewall-router-NAT configuration and the resulting IP routing works out of the box. It also avoids the case where users and software are active on the firewall (as is the case with a dual-NIC host system acting as a firewall), and where these activities happen to modify the firewall configuration; this whether by accident, by intention, or through an exploit. Firewalls are best kept locked down.
If you want to learn IP routing and preferred paths and other network-level considerations, then by all means do continue to work with a dual-NIC host system. (This isn't specific to Mac, either. This is simply how IP and IP routing works. There's no concept of automatically returning the packets of a connection out the same controller that the connection arrived on, for instance. And various IP protocols don't use connections.)
As for DNS and particularly with NAT, you'll probably end up with a split configuration. I'd tend to have an external DNS provider translate the public DNS domain and the public address, and have the NAT box (with port forwarding) map that to the appropriate private IP address. Within the private address space, a private DNS domain (a subdomain of a public registered domain, or a separate registered domain) uses the local (private) DNS server to resolve its queries, and that DNS server forwards queries for which it is not authoritative to the organization's public DNS server.
Do use node.foo.example.com and node.example.com (where you own example.com) or use node.example.com and node.example.net (where you hold both domains), with the former being external and the latter being the internal address space. Having the same name resolve to two different IP addresses gets weird, as (for instance) a laptop moving between domains (particularly in the co-presence of that abomination known as NAT) may not end up routing its IP traffic where you expect. Having the convention of a specific internal subdomain or a specific internal domain also makes the "inside versus outside" distinction very clear, too. It's possible to use a completely private domain internally, but (given ICANN is opening up TLDs, and in the absence of an ICANN-reserved internal-only domain) I don't recommend that.
If you want to continue with the original course of action, this IP routing and split DNS is a common question. Dig around in the forums, and dig around specifically for discussions of IP default routing, for split-brain or split-horizon or split-zone DNS, consider acquiring Cricket Liu's DNS book (which is what we all usually go read when we hit a DNS weirdness), and for tools such as the CutEdge Systems DNS Enabler tool.

Ip helper-address with two dhcp server

I have two dhcp server running on vlan1, which serving our workstation on vlan2. 10.10.10.51 is our primary and 10.10.10.52 is secondary server.
My question is:
- Which server would my workstation get the dhcp from?
- If the primary server is down, could I reach the second dhcp server? and if the primary server back online.. Which server would be serving our dhcp client?
interface Vlan1
ip address 10.10.10.1 255.255.255.0
no ip redirects
ip directed-broadcast
interface Vlan2
ip address 10.10.20.1 255.255.255.0
ip helper-address 10.10.10.51
ip helper-address 10.10.10.52
no ip redirects
ip directed-broadcast

Hi,
I don't agree.
AFAIK, using two ip helper-address entries in a router config will cause the dhcp request being sent to BOTH dhcp servers.
So both the primary and secondary dhcp server will send a dhcp offer to the workstation. The workstation will choose one of the offers and confirm it to the server.
So ip helper-address command will not help you to choose if dhcp server is primary or secondary.
You can either use different dynamic address pools on primary and secondary dhcp server (and the same static entries) or to arrange some kind of dhcp server failover:
See
http://www.microsoft.com/windows2000/en/server/help/default.asp?url=/windows2000/en/server/help/sag_DHCP_imp_ClusteringSupport.htm
There is also RFC 2131 describing DHCP Failover Protocol.
Regards,
Milan

FMS-Srv Win2003 Setup with two NICs

Hello Forum,
I have a problem with setting up my FMS and to NICs.
NIC #1: public IP
NIC #2: private IP
On #1 I will setup port 1935 and 80 - Clients can connect to my livestreams
On #2 I will setup port 1935 and RDV for the FlashLiveEncoder and the RemoteDesktop
My problem is, when I activate the NIC #2 the FMS is noct reachable from the public NIC.
I think it is a FW problem or a problem withe application.xml.
Does anybody know how to setup my server (NIC, application.xml and FW) to run how I like?
Regards,
Daniel

Hi,
fms.ini:
ADAPTOR.HOSTPORT = :1935,80
Adaptor.xml:
<Adaptor>
    <ResourceLimits>
        
        
        <MaxFailures>2</MaxFailures>
        
        
        <RecoveryTime>0</RecoveryTime>
    </ResourceLimits>
    
    <HostPortList>
        
        <HostPort name="edge1" ctl_channel="10.0.0.250:19350">10.0.0.250:1935</HostPort>
        <HostPort name="edge2" ctl_channel="217.x.x.x:19351">217.x.x.x:1935,80</HostPort>
    </HostPortList>
    <Allow></Allow>
    <Deny></Deny>
    <Order>Allow,Deny</Order>
    <HTTPTunnel>
        <Enable>true</Enable>
        <NodeID></NodeID>
        <IdlePostInterval>512</IdlePostInterval>
        
        
        <IdleAckInterval>512</IdleAckInterval>
        
        
        
        
        <IdleTimeout>60</IdleTimeout>
        <MimeType>application/x-fcs</MimeType>
        
        
        <WriteBufferSize>16</WriteBufferSize>
        <SetCookie>false</SetCookie>
        <Redirect enable="false" maxbuf="16384">
            <Host port="80">:8080</Host>
            <Host port="443">:8443</Host>
        </Redirect>
        <HttpProxy enable="true" maxbuf="16384">
            <Host port="80">${HTTPPROXY.HOST}</Host>
        </HttpProxy>
        
        
        
        <NeedClose>true</NeedClose>
        <MaxWriteDelay>20</MaxWriteDelay>
        <MinWriteDelay>12</MinWriteDelay>
        
        
        <MaxHeaderLineLength>1024</MaxHeaderLineLength>
        
        
        <Edge name="Edge1">
            <Enable>true</Enable>
            <IdlePostInterval>512</IdlePostInterval>
            <IdleAckInterval>512</IdleAckInterval>
            <MimeType>application/x-fcs</MimeType>
            <WriteBufferSize>16</WriteBufferSize>
            <SetCookie>false</SetCookie>
            <Redirect enable="false" maxbuf="16384">
                <Host port="80">:8080</Host>
                <Host port="443">:8443</Host>
            </Redirect>
            <NeedClose>true</NeedClose>
            <MaxWriteDelay>40</MaxWriteDelay>
        </Edge>
    </HTTPTunnel>
    
    
    <SSL>
        
        <SSLServerCtx>
            
            
            
            <SSLCertificateFile></SSLCertificateFile>
            <SSLCertificateKeyFile type="PEM"></SSLCertificateKeyFile>
            
            
            
            <SSLPassPhrase></SSLPassPhrase>
            <SSLCipherSuite>ALL:!ADH:!LOW:!EXP:!MD5:@STRENGTH</SSLCipherSuite>
            
            
            
            <SSLSessionTimeout>5</SSLSessionTimeout>
        </SSLServerCtx>
    </SSL>
    <HTTPIdent enable="false">
        
    </HTTPIdent>
    <HTTPIdent2 enable="true">
    </HTTPIdent2>
    
    
    <HTTPNull enable="false"></HTTPNull>
    <HTTPUserInfo enable="false">
        
        
        
        <Path></Path>
        
        
        
        <MaxSize></MaxSize>
        
        
        <UpdateInterval></UpdateInterval>
    </HTTPUserInfo>
    
    
    
    
    <EnableAltVhost></EnableAltVhost>
    
    <RTMP>
        
        
        
        <RTMPE enabled="true"></RTMPE>
    </RTMP>
</Adaptor>
Yes, I can telnet both ports!
Regards,
Daniel

How can i split Client Network traffic and My exchange traffic with two differnet ip address?

Hello Everyone
sorry for my bad English and also my bad explaine
here is my network looks like
all the client on one subnet and network is 192.168.0.0
i have Dsl router that connect to Tmg server
i have Tmg with two NIC
1-192.168.0.4
2- 2 Public Ip address
i want to do this
i want to split user's traffic and my exchange traffic
i mean i want to route user's traffic with one public ip addresss
and my exchange server's traffic with another public address
but when i add additional ip address at Tmg or create new NIC card
all of my traffic route with one public ip Address what should i do?

Hi Uhan,
You need to use ENAT fuction on TMG to achive this
On the External NIC assing the Second IP as Additionl IP address (VIP)
Create a network Rule to NAT traffice From Exchange server IP address to the required Public IP which you need the E NAT.
Ensure you are creating rule only from Exchange server IP and not all INternal.
Look at the below Doc you step by step config
http://www.isaserver.org/articles-tutorials/configuration-general/Configuring-One-to-One-NAT-TMG-2010.html

Mac Mini, two NICS and DNS

Hi everybody,
I'm not able to properly set up DNS role in Snow Leopard server with two nics. This is my situation:
NIC 01: WAN
Type: Builtin
IP: 192.168.1.252
SN: 255.255.255.0
GW: 192.168.1.254 (ISP Router)
DNS: 192.168.1.254
Domain: homenet.telecomitalia.it (ISP domain)
NIC 02: LAN
Type: USB
IP: 172.16.0.254
SN: 255.255.0.0
GW: empty
DNS: 172.16.0.254 or 127.0.0.1
Domain: mydomain.kzy
I'd like to provide DNS, DHCP, Directory service, print server with the LAN interface and use the WAN Interface only for internet access.Obviously all clients must have access to the web. In windows server there's a role called RRAS (routing and remote access) that allows sysadmins to do this quite easly, but in os x server I was not able to find nothing of similar. If i setup my server only with tha lan interface everything works great, but when I add the wan interface the dns stop working; seems that operating system confuse externale dns with internal dns. Obviously something is wrong in my configuration, please an anyone help me to solve this problem?
Thanks in advance
Alessandro

That's fairly typical of the problems encountered with OS X operating as an (expensive and slow and variously vulnerable) IP router. OS X Server can be configured as a gateway if you follow the set-up directions exactly.
It's local preference to configure either a commercial NAT-gateway-firewall-router box, or repurpose a spare two-NIC x86 box with M0n0wall, Smoothwall, pfSense or other open-source.
Preferably a box with a VPN server, but your 192.168.1.252/24 public-side IP address is going to cause issues with a VPN.
And in one reading of your configuration details, your ISP router is already a NAT-gateway-firewall-router box (based on that 192.168.1.252/24 private address you've shown), so you might want to investigate what its particular capabilities and features are. With that NAT assumption, you're headed toward double-NAT connection, and that'll play havoc with your networking. Single-NAT is problematic enough.
If that "ISP router" box is a NAT-gateway-firewall-router, then you'll be reconfiguring it for a subnet in your 172.16.0.0/12 or other private address space (which would make VPN pass-through more widely reliable), or moving your network into 192.168.1.252/24.
If you post the identity of the particular "ISP router", somebody might know its capabilities. Folks at your ISP almost certainly will, of course.

Is it possible to redirect to same port two NICs

Dear members,
I have to setup my Solaris10/Apache server with two NICs, then I want to redirect the 80 port to another port like 777 for both of NICs. I mean, all the NICs should listen the 777 port and redirect incoming packets to 80 port. I tried this, but I was never able to set it successfully for both NICs. But when I unplumb one of the NICs, it's ok. The other is redirecting. But I cant do this for both of them.
Any idea about this ? Please help.
Thank you.

user5401524 wrote:
I have additional findings.
After commenting /etc/defaultrouter and flushing the routing table, I'm able to reach the forwarded ports.
If I try from a server which is in the same subnet with this server I'm able to ping, telnet the port or reach via webbrowser. And the port forwarding is working too. But if a try from another subnet, it's not possible. It seems to me like a routing problem but I cant explain that yet.
Fyi.I don't know that the ipfilter syntax provided in the example is correct - I'd check with the ipfilter man page.
It looks like you are trying to redirect any outgoing address for port 7777 to 127.0.0.1 port 80, but when your packets
are looking up the routing table, and finding the default route first so that the outgoing packets would never
really have the 0.0.0.0 ip destination that your rule is set up for.
--Sowmini

Two NICS presented to OS, possible to only present one ?

B200-M1 blades and Menlo CNA.
The SPs are using a dynamic vNIC templates with fabric A or B selected and F/O enabled.
What we're witnessing is the OS will always be presented with two NIC's. Depending on which Fabric A/B the SP is set to determins which NIC is active. eg : In Linux eth0 & eth1 are detected. If the SP points to A eth0 is active, and B then eth1 is active.
My question is : Using the Menlo card is it possible to present only one NIC to the OS and still retain f/o ?
We use a number of auto config tools and really want consistency on which NIC is active but also still want to use both A & B fabrics. Rather than assigning all SP' to A.
Paul

Paul
These are 2 static PCI devices (with device numbering) which the OS will show.
Default behavior with Menlo (linux terminology):
Lets say you don't create any vNICs in a SP and give it to a Menlo adapter based blade.
Your ifconfig should show eth0/eth1 while the link on both will be down (i.e unusable as the FI side config isn't done).
If you create 1 vNIC (side A), your eth0 will have link up with correct VLANs, eth1 down.
If you create 1 vNIC (side B), your eth1 will have link up with the correct VLAN, eth0 down.
It is for the way OS enumerates the devices. The first ethernet device is wired to side A.
You could potentially try changing the HWADDR/MACADDR in the /etc/sysconfig/network-scripts/ifcfg-eth[0-1] files to see if it works for you i.e assign an ip based on it.
With M81KR as I mentioned before you don't have this issue. You can call out the PCI order, number of devices and which vNIC goes to which side.
So 2 vNICs created in the M81KR could both be going to side A for example. This vNIC config will fail on a Menlo.
Is the use case that for a singly attached server, you are trying to do half the blades use Side A while the other Side B while maintaining uniformity in your imaging tools?
--Manish

Two websites on different networks - two NICs

Hello,
I have got an xserve, running 10.4.3 with two NIcs on different networks (192.168.... and one on a 10.0.0...) , connected to two different ISPs. I would like to run two websites, one per ISP/network card.
I've read through Apple's doumentation - I think the problem is that OSX will only connect to the internet via one network card. Any I dea what I can try?
I have seen a post on the discussion board regarding the ipfw.conf and firewall
Thanks,
Nico

It has to do mainly with a routing table. In that routing table you tell the router if the destinition IP is X from Subnet Y send it through Gateway Z like this:
Destination | Subnet mask | Gateway
192.168.40.0 | 255.255.255.0 | local
10.65.1.0 | 255.255.255.0 | local
192.168.32.0 | 255.255.255.0 | 192.168.40.13
192.168.35.0 | 255.255.255.0 | 192.168.40.14
192.168.0.0 | 255.255.0.0 | 192.168.40.13
10.0.0.0 | 255.0.0.0 | 10.65.1.25
0.0.0.0 | 0.0.0.0 | 10.65.1.1 (Default)
Just set-up where things can come from and where they should go. Setup a good defauly and you should be set.
Hope that helps a little.
Sorry if the table is a little hard to read.

Very slow network performance with Intel NIC when TCP Large Send Offload is enabled

I have a Windows 2008 server with two NIC's (Intel PRO/1000 PL and Intel PRO/1000 PM), and one virtual external switch connected to each NIC.
With the 01/14/08 network driver, I get very low throughput on both NIC's (~10KB/sec when downloading from my server when it should be around 11MB/sec).
I've found that disabling "TCP Large Send Offload (IPv4)" on the virtual switch and "Large Send Offload v2 (IPv4)" on the physical adapters solves the problem.
Is this a bug in the driver?
Thank you,
Ricardo Costa

2 years later, I was able to get that machine to work with Hyper-V under Windows Server 2008 R2, but only after disabling everything that had anything to do with TCP or IP offloading. I think that I had to turn off 4 settings on one controller,
and 5 settings on the other controller. Once that was done, everything worked flawlessly. It is very apparent that the Virtual Controllers do not properly use many of the features of non-Intel devices (not all Intel devices work either), and
that Hyper-V does not completely uninstall if you remove it.
If you have any problems, start turning off the features that your adapter supports, until it starts working. You'll need to weight the cost of replacing the controller with a fully supported controller, of which there is no list, or using your existing
controller at a capacity lower than it physically supports. This has been an elusive issue with Microsoft's Virtual Server projects since they were first in beta, so don't expect a fix anytime soon.
P.S. For those who don't know, the settings are on the actual device and can be changed in the Device Manager. If you are still having trouble after turning off all the settings, then you will need to replace the controller(s) with a different
make/model.
Bill Bosacker's Blog @ http://www.openSourceC.org/

Windows server with one NIC and two IP address answers to ping with wrong address.

Hi,
I have Windows 2012R2 server, as a web server. It has only one NIC, and I have given it two IP addresses. 10.0.0.11 at the main Window, and under the advanced tab, I have added 10.0.0.12 as additional ip to the nic. I have even but to
host file a row, that states 10.0.0.11 server.domain.local.
Now when I ping "server.domain.local" from the server itself, it gives me 10.0.0.12 as answer.
With nslookup I can get correct address (10.0.0.11). But when I type server.domain.local to the web browser it tries to connect 10.0.0.12, which is incorrect. It should connect to 10.0.0.11 address. Could you please help me?
Regards,
Jouko

Windows does not work well with two IP addresses on the same subnet. Results are inconsistent, as you have discovered. In general, you should never try to put two IP addresses from the same subnet onto a single Windows box. That means either
multiple addresses on a single NIC or on multiple NICs.
Maybe if you tell us what you are trying to accomplish by having two addresses, we could provide better assistance.
. : | : . : | : . tim

How can i pay on the apple store online with two credit cards, with two different billing addresses

I will be greatful if you could answer me this question...
How can i pay on the apple store online with two credit cards, with two different billing addresses?
I know that you can use two credit cards to pay an item but the problem is that i can only put the billing address of just one of the credit cards, and since the two cards are from different people (my parents) i can't do it. They live in the same place so i don't know if i should just put one of the billing address.
Thank you.
PS. I don't know if this is the right community to ask this, sorry if i'm wrong.

On the Apple Store "Payment & Pricing" page it states:
Using more than one payment card
You can also combine payment methods to pay for your purchase. Choose from the following combinations of credit cards and Apple Gift Cards:
Credit card(s) - up to two
Apple Gift Card(s) - up to eight
Apple Gift Card(s) + one credit card
During checkout, if you are paying with a gift card issued by a credit card company, you can combine it with one credit card.

Hi my name Abukar I had an old apple ID and I had problem with signing it so I decided to make a new apple ID with a new email address, so how can I link with two apple IDs and how can I get back all my previous apps that I purchased before, I cloud stuff

Hi my name Abukar I had an old apple ID and I had problem with signing it so I decided to make a new apple ID with a new email address, so how can I link with two apple IDs and how can I get back all my previous apps that I purchased before, I cloud stuff

It is not possible to do that.
Allan

How to replace one char with two chars in email address policy?

I very much like to replace the 'ß' char in the surname with 'sz'. However, applying filter '%rßsz%[email protected]' on 'Preußig' leaves me with '[email protected]'.
So, how do I replace one char with two chars in email address policy?

As far as I know, your only solution is to manually create such addresses instead of using e-mail address policy.
Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."

IP Address with two NICs

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