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How to enable more than one network

Posted on 2008-10-02
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Last Modified: 2012-08-14
Curious...

I just bought a 2008 server and am trying to configure 1 network port to talk to my internal network and two of the other ports to talk to my iSCSI SAN connected via a Cisco switch.  

Whenever i enable the secondary ports my main port goes down and i lose connectivity...

any ideas?
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Question by:javajo
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by:Kyle Abrahams
Kyle Abrahams earned 1200 total points
ID: 22626119
You should be able to do this using virtual IP addresses.  Simplest solution though would be to add a second nic card and have one card talk to the internal network.

I'm confused about the ports you're describing.  Are you talking about the cisco switch or within 2008 server itself?

Can we see your current configuration when you have connectivity and then when you lose it?
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Author Comment

by:javajo
ID: 22626419
oops - didn't mean to be unclear.

I have two nics installed on my server.  One built in, one add-on card - each nic has two ports.

On nic A - I've enabled port 1 and assigned it a 172.16.1.x static ip address to talk to the rest of our LAN.

On nic B - I'm trying to enable ports 1&2 and assign them static IPs 10.0.0.x and 10.0.0.x.  These ports will used for iSCSI traffic and carry traffic back and forth betweeen our SAN.

Problem is wheneve i enable any ports on nic B, i loose connectivity on nic A and can no longer ping or connect via RDP to the server.





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LVL 41

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by:Kyle Abrahams
ID: 22626474
What if you reversed the nics?  (EG: NIC A becomes 10.0.0.x and B becomes 172.16.1.x)

What's the final application of the SAN, are you going to have the network talk to it? (EG: what if you created a logical bridge between the 2 networks?)



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Author Comment

by:javajo
ID: 22626533
I'm going to use the iSCSI initiator to create LUNS
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Author Comment

by:javajo
ID: 22626542
Another thing....One nic - the 172.16.1.x shows up as "domain network" while the other shows up as "public network"....
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LVL 11

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by:loftyworm
loftyworm earned 400 total points
ID: 22626572
I have experienced this issue and other odd ones like this, we do a private public network thing as well.  When these problems pop up, we turn on Routing and Remote access, to direct the traffic.
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LVL 12

Assisted Solution

by:rionroc
rionroc earned 400 total points
ID: 22626579
Hello

Check the IP address of each Computer.

Don't do the same ip address to the other computer.

sample:
computer1:
ip address: 192.168.0.11
submask: 255.255.255.0

computer2:
ip address: 192.168.0.22
submask: 255.255.255.0

computer3:
ip address: 192.168.0.33
submask: 255.255.255.0


The Dns and Gateway - it depends on your internet provider.



Everything is beautiful, Everything is wonderful, Every perfect gift comes from the creator of life.

Great is our GOD.
:)
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Expert Comment

by:loftyworm
ID: 22626589
If you are having troubles enabling both networks at the same time, remove one nic and reinstall it, I would suspect an IRQ or some other conflict.  Are these onboard nics?

Also, be VERY careful about assigning more then one gateway, it freaks our windows (hence the R&RA)
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by:rionroc
ID: 22626650
Ops!

I though I was the first one to comment.
I was wrong letting the page on standby.
When I Clicked the submit button, I've read so many post now.
Sorry if I got it wrong.


Indeed.
Great is our GOD.
:)
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LVL 41

Expert Comment

by:Kyle Abrahams
ID: 22626738
What's the endpoint goal of the SAN?  (To be used by whom? Domain users, public users, etc?)

10.0.0.x is a class A network which may be the reason why it's registering as public.  Can you change the IPs for that subnet?  

RRAS is a way to force it to work as well.  
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Author Comment

by:javajo
ID: 22626926
The endpoint of the 10.0.0.x network is basically private meaning no one on the LAN needs to access it.  
These ports on the NIC plug directly into a private switch that plugs directly in to the SAN.  Only iSCSI traffic passes over these links.
There is no gateway - just an ip and subnet mask configured on the NIC

(banging head against wall...)

I was able to do this with no issues on Server 2003.....

It has to be some new security setting that i have yet to understand....


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by:loftyworm
ID: 22626972
I still think RRAS will save you some head bruising
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Author Comment

by:javajo
ID: 22627096
installed rras and enabled LAN routing...
Still not working....
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LVL 41

Expert Comment

by:Kyle Abrahams
ID: 22627106
I would try changing the classifcation of the network to a private network  (vs. public domain) from your control panel.  If no one needs to get to it from the LAN no need for RRAS.  My guess on the security would be that it cuts off traffic from the domain network while connected to a public network.  
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Author Comment

by:javajo
ID: 22627256
that's what i'm guessing....how does one do this?  I only see one network on the "map"
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Author Comment

by:javajo
ID: 22627400
Set to SAN network to private.....no go
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by:Kyle Abrahams
ID: 22627625
Would try reversing the NICs as well . . . just to be on the safe side.  Work only with 1 port at a time per nic to ensure you're testing all possibilities.  

Confirming that the issue is when you enable the SAN side the Domain network traffic cuts out.  Is the second network disabled or what do you see?  
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Author Comment

by:javajo
ID: 22628066
As soon as i enable the secondary nic that has the 10.0.0.x network, i lose connectivity to the server via RDP and i can no longer ping it.  the secondary network shows up as "unidentified network" while the other shows as the name of my domain....
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Expert Comment

by:Kyle Abrahams
ID: 22628171
Can you attach a monitor to it or how do you set it back to the way it was?   I'm curious to see if the other network is actually being disabled or what happens with the first network.
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Author Comment

by:javajo
ID: 22628209
yep - I'm consoling in via KVM.  The other NIC does not show as disabled...
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by:Kyle Abrahams
ID: 22628295
can you ping anything off the domain network?  

see this for adding a static route:
more than 1 network windows server 2008

Do you have a default gateway set for both network adapters?  If so drop the one that is connected to the SAN.
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by:Kyle Abrahams
ID: 22628301
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Accepted Solution

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javajo earned 0 total points
ID: 22628930
Me being able to ping all the networks from the box but not be able to ping it remotely made me wonder......sounds like the @#$% firewall..

Yep.  Firewall turned on.  turned off and viola - able to connect.  That still does not explain the weirdness with the disconnects but I'm guessing that the firewall wasn't  enabled on the primary nic...maybe it was only enabled on the secondary and after i enabled the interfaces i was booted....


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by:Kyle Abrahams
ID: 22635835
glad it was able to be resolved.  
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