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Seperate Network for Backukps not working

Posted on 2007-03-23
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Last Modified: 2010-08-05
I am trying to create a simple backup network for backing up my servers.   My backup server has Windows Server 2003 R2 with Backup Exec 11D.  My NAS server is running Windows Server 2003.  I have multiple network cards in both my backup server and my NAS server which are the only two I have connected on the Backup network.  My hardware for the backup network is a simple NetGear Gigabit switch.  I have configured the NIC's on the backup network for 192.168.13.X and a 255.255.255.0 subnet mask with no gateway, no dns and no wins servers.  Of course, their other NIC is attached to the production network with all these settings.  I have added the routes on each server to the host and lmhost file for each server.  I can ping by name two each server and it resolves my 192 addresses.  However, when I try to browse to a network share on the NAS from the backup server I get an error no network provider is available.  Also when I try to backup the NAS with Backup Exec ( I tell it which card and subnet to use) I get a communication error.

This seems like a simple concept but I am obviously missing something.  Sorry for the long description but as you see I have already spent some time on this.
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Question by:pitroadhobo
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by:djohnson104
ID: 18781185
Browse? can you just \\ServerName?
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by:pitroadhobo
ID: 18781594
Either browse or \\servername gives me the same results.  Also, going to \\ip address gives me the same error.  Also, I need to mention that this is running in an AD environment.
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by:djohnson104
ID: 18781639
Ok let me see if i can picture this
Server 1 on production 1 (NIC 1 IP 192.168.25.25  SN 255.255.255.0 GW 192.168.25.1) - (NIC 2 IP 192.168.13.10  SN 255.255.255.0 GW None)
Server 2 on production 1 (NIC 1 IP 192.168.25.35  SN 255.255.255.0 GW 192.168.25.1) - (NIC 2 IP 192.168.13.20  SN 255.255.255.0 GW None)

Backup Server (IP 192.168.13.30 SN 255.255.255.0 GW 192.168.13.?)
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by:juanfermin
ID: 18781811
Without a DNS to resolve network addresses you would need to add the NetBEUI protocol to be able to route the traffic.
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by:juanfermin
ID: 18781821
BTW, that solution is provided that your NIC card settings are as djohnson104 had specified, if they're on different subnets, that's the first problem.
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by:pitroadhobo
ID: 18781838
Production network is 172.19.166.0 255.255.254.0
I have only mentioned two servers.  The NAS server and the Backup server.  Both servers are on both production network and backup network.
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by:pitroadhobo
ID: 18781860
According to other solutions in the Expert Exchange, I should be able to use host files to bypass DNS juanfermin.
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by:juanfermin
ID: 18781903
That's true, but I've found from Windows that you usually have to have a main plan and a backup plan for everything, because it doesn't always work as it's supposed to.  This is one of the reasons why I still use Wins Servers, because even though they're "supposed" to be obsolete, I've found that, especially in the larger networks, you need an alternate if for whatever reason the DNS isn't working as expected.
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by:djohnson104
ID: 18781934
I think we you should drop the whole DNS thing for now. That is just another layer to troubleshoot. Use ip addresses and get your connection working then worry about name resolution.

So you have 2 servers both on 2 networks right? Are they directly connected to each other on the 192.168.13.0 network? or are their switches involved?
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by:djohnson104
ID: 18781948
Whats with the wins and the dns? we have 2 servers and 4 network cards. we need two servers to communicate right now lets not make it harder than that.
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by:pitroadhobo
ID: 18781955
The can talk to each other on the production network wich involves a CISCO 6513 core.   For the backup network, I have placed a small 5 port NetGear Gigabit switch (unmanaged)  to connect them together.
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by:djohnson104
ID: 18781973
Ok and backup  connects to Nas and grabs the files it needs to back up?
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by:djohnson104
ID: 18782009
Where I work they build simulators that have multiple computers with multiple nics.  The problem is on the back up network their is no gateway to send the data to. So it sends the unknown data out the production nic. What you need to add are static routes for your backup network on each machine.

http://www.microsoft.com/resources/documentation/windows/xp/all/proddocs/en-us/sag_tcpip_pro_addstaticroute.mspx?mfr=true

This is the link i used, i am sure it will work for 2003 and 2000 as well. Make sure you add the -p flag to save the route after reboot.
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djohnson104 earned 500 total points
ID: 18782040
192.168.13.2 255.255.255.0
route add  -p 192.168.13.0 255.255.255.0 192.168.13.2 metric 2

192.168.13.3 255.255.255.0

route add -p  192.168.13.0 255.255.255.0 192.168.13.3 metric 2

Give it a shot and see how it goes. IF that works then you can edit your host file and add the name to ip resolution. I choose not to use DNS for backups because that is just one more chance of fault.


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by:djohnson104
ID: 18782047
Oh and that is one route for each machine, change the ip addresses to the proper ones.(i am sure you know that)
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by:pitroadhobo
ID: 18782545
That sounds like a winner.  I have already changed everything to run on the production network for this weekend.  I will give this a test next week and let you know.  Also, I am assuming if this works, I will need to add it to the autoexec or something in order to save the settings?
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by:djohnson104
ID: 18782599
The routes? as long as you add the -p flag it will save it in the registry.
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by:groetting
ID: 18805865
First of all, for the backup network, use separate ip adresses, for instance if you use 192.168.13 use something else for the backup network. For instance 10.0.0.x then, if use use host files, name the backup nodes differently (one name for 192.168.0. address and one other name for the 10.0.0. address. (if you even need to use names for it, on your small network you can use ip addresses. Using this configuration you would ensure that the backup traffic goes on the backup nic and it will not interfere with your current setup
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by:djohnson104
ID: 18807204
Quote "Production network is 172.19.166.0 255.255.254.0
"the backup network for 192.168.13.X
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by:groetting
ID: 18807423
Sorry I didnt see that, but the rest of the info still applies.
pitroadhobo: In the backup policy, have you named the server you are trying to backup by name or IP? If you are using a name you should call it something else than the production name, that should fix so you dont have to add any routes. I must add that I provide backup for alot of hosts using a separate backup nic. As long as you either provide a unique name that is associated with the backup nic, or the ip of the backup nic you should be ok.
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by:pitroadhobo
ID: 18808971
djohnson104

I get the error "route: bad argument 192.168.13.2" when I run the route add command as in your example.  I have tried some different variation and even tried running it with the clear all routes commands.   I am running "route add -p  192.168.13.0 255.255.255.0 192.168.13.3 metric 2" on the machine with the ip address of 192.168.13.3.  Any suggestions?
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by:groetting
ID: 18810011
you need to add MASK between the first ip and the mask.
( route -p add 192.168.13.0 MASK 255.255.255.0 192.168.13.3 metric 2 )

I still cannot see why you need to add this route if you read my other post.
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by:pitroadhobo
ID: 18810285
Ok
How should I specify the different host name for the interface? Do I just do that in the host file or is there another place?
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by:djohnson104
ID: 18810334
So groetting, what you are saying if he adds his hostname to ip in the host file it will work? If so then he should be able to just use IP address right?
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by:groetting
ID: 18810583
Again I am sorry, I missed the fact that he was unable to use the ip adress.
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by:djohnson104
ID: 18810726
run a "route print"

Let me know what you get.
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by:VXDguy
ID: 18848087
If you use multi-homed nics, you need to be really careful with DNS since DNS will resolve to *one* ip address.  Doesn't matter that your server has two IP's, the server's name only resolved to one IP as specified by DNS.

I setup backup-nic DNS entries, that is, dns wwwserver.mycompany.com is 10.2.2.4, but backup-wwwserver.mycompany.com is 192.168.2.4.  The server has two nics, one on IP 10.2.2.4 and the other on 192.168.2.4.  It has two DNS entries, one resolves to the application IP (10.2.2.4), the other resolves to the backup IP (192.168.2.4) used specifically for backup services.

As for your connectivity issue, I'd recommend using wireshark (i.e. ethereal) to analyze your network packets and figure out just where your data is being sent.  Windows may not be configured right, but it's not always easy to see what Windows is doing or why.  Running the network sniffer will show you what's actually going on.  Sometimes that helps you determine why the config isn't working since you can see the incorrect behavior.  Right now you can't see what's wrong, it's just not working.
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by:djohnson104
ID: 18850214
Why do you need dns? Shouldn't you just worry about getting IP working without DNS. DNS is just adding another lable of troublshooting. Once you get it working VIA IP then you should worry about DNS. Networking WILL work with out DNS or WINS. Name Resolution is just something to make life easier. I say get it working by IP first then worry about DNS.
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by:pitroadhobo
ID: 18850748
I have to use DNS on my production network for my client workstations.  I think the problem is that my backup sever is on both networks and it is difficult to tell it which network to talk across.  Obviously, DNS and Active Directory have a lot of control on my network so they may be dictating which subnet is used.  When I put the entries in the host file, routing and name resolution works correctly.  When I ping either server by name it resolves to the backup network.  But when I try to go to a UNC path, it fails, thus Backup Exec fails when trying to contact the server.  Something about authentication which may be an Active Directory hangup.  The additional DNS entry may be the trick but I  am very hestitant to try that on the production network.  Again, I say this seems to be such a simple concept but I can't explain why it doesn't work.
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by:djohnson104
ID: 18851186
Well you problem starts before AD or DNS. Your trying to fix the whole system at once. You need to get the underlying network working first. Your IP does not work your DNS will not work, if your DNS does not work then your AD will not work. The whole purpose of the OSI model is to work in layers.
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by:pitroadhobo
ID: 18939476
I will try an additional DNS entry for the backup network.
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by:djohnson104
ID: 18939559
For DNS to work you need your underlying IP to work.
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by:Computer101
ID: 20355307
Forced accept.

Computer101
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