SC 3.2 with one NIC

Hello,
I am going to learn SC 3.2 and want to deploy testing cluster. Unfortunatelly the hosts I have to do so has only one NIC each. While it is not supported/adviced in production can I install/use/learn SC 3.2 having only one NIC (of course in testing environements) ?
Regards
przemol

If you just want to setup a single-node cluster then yes, this is possible, since you don't need any adapters for private interconects. Your single nic is for public network.
If you want to setup a two-node cluster, then no, this will not work. The only variant that could work is usinging a vlan-tag capable nic card together with a switch configured to use with vlans. Then you might be able to achieve this, but I never tried to do that for both, interconnect and public lan at the same time with just one nic.
Greets
Thorsten

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Make a router out of a simple notebook with one NIC (buy a second NIC)

Hello all,
Before starting, I think I must say hello to you because I'm new here : this is my first post . So, in fact, I'm working with Linux since 5 years. I'm running Gentoo on my workstation and my old server, Ubuntu on my notebook and for family, and finaly, I'm running Red Hat at work place for workstation and servers. I'm a Linux and JBoss administrator .
I've decided to run/try Arch because it seams to growth with rock-solid ideas and it's a binary distribution. I now prefer a binary distribution for my server, because it's taking too much time to let old computer or notebook compile the whole world (alone or not ...). I prefer now looking around and learn another Linux distribution. This is why I started to install my first Arch Linux : I will try to run a server on a simple notebook. In fact, it's a working machine, but without any graphics capabilities (memory has burned...), and so, perfect for a little server low consumption. I want it to replace my current server/router running Gentoo on an old Pentium 3.
For now, I've encountered these little problem :
- LID problem when screen is close : reboot never work (power off just after the BIOS, when the LID state is "screen closed"...) => disable LID connection (unplugged from motherboard)
- ssh problem => must now use "/etc/hosts.allow" to let remote machine to be connected
- try routing packet with one NIC => for now, doesn't work ...
- try to get X11 Forwarding => doesn't work too, but it will works quickly
My infrastructure is just a server/router splitting in two part for the LAN at home :
- one part is LAN with all workstations
- the other part is LAN_router which is another network with only the ADSL router to access internet
So, its looking like this : <machine1> => <switch> => <[eth1]server/router[eth0]> => <switch> => <router_ADSL> => INTERNET
All is fine ... with the old machine ... for the new one, it has only one network interface ... The question is : how to do routing with only one NIC ???
In theory, I "should" work ... but .. some component can have some little hard time to do the right things .. and for me, is not working right now.
The first try is to use one interface with one IP aliasing, like this :
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:1d:e4:a3:d5:1a brd ff:ff:ff:ff:ff:ff
inet 10.2.1.8/26 brd 10.2.1.63 scope global eth0
inet 10.2.1.66/26 brd 10.2.1.127 scope global eth0:0
inet6 fc80::21a:e2ff:fea3:d56a/64 scope link
valid_lft forever preferred_lft forever
Two sub network are used :
- 10.2.1.0/26
- 10.2.1.64/26
I must have 2 ip on one NIC, so aliasing can be used (when testing, the new server/router is able to ping a workstation and the ADSL router ; it can also use internet). I've heart there is some problem with "iptables" to set forwarding rules when using IP Aliasing ... but I prefer try myself . It doesn't work for now, probably because of this. But, is there a way to use a "workaround" ? For example, if "iptables" is not able to play with aliasing, and so, interface such as "eth0:0", may be there is a way to tell it, like this :
[root@serveurn ~]# iptables-save
# Generated by iptables-save v1.4.10 on Sun Dec 12 17:30:01 2010
*nat
:PREROUTING ACCEPT [0:0]
:INPUT ACCEPT [0:0]
:OUTPUT ACCEPT [0:0]
:POSTROUTING ACCEPT [0:0]
-A POSTROUTING ! -d 10.2.1.0/26 -o eth0 -j SNAT --to-source 10.2.1.66
COMMIT
# Completed on Sun Dec 12 17:30:01 2010
# Generated by iptables-save v1.4.10 on Sun Dec 12 17:30:01 2010
*filter
:INPUT DROP [0:0]
:FORWARD ACCEPT [0:0]
:OUTPUT ACCEPT [9:932]
-A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT
-A INPUT -i lo -j ACCEPT
-A INPUT -p icmp -j ACCEPT
-A INPUT -s 10.2.1.0/26 -p tcp -m tcp --dport 22 -j ACCEPT
-A FORWARD -m state --state RELATED,ESTABLISHED -j ACCEPT
COMMIT
# Completed on Sun Dec 12 17:30:01 2010
... use the interface "eth0" (for the whole throughput) and do SNAT for all excepted for the LAN network ? But it seams to not work ...
I got a second idea : if it wan't work with aliasing ... may be can I use virtual interface and bridge ... create a bridge with "eth0" and "tap0" so I can add more than one ip in the machine .. and may be, will be able to route packet from these two interface ???
But for now, I have to understand why X11 Forwarding don't work ...
EDIT: xorg problem solved : xorg-auth was requested ...
Last edited by loopx (2011-01-09 18:08:28)

fukawi2 wrote:" ...it is dirty and nasty and shouldn't be done unless you're stuck on a deserted island and your only hope of rescue is building a router out of 2 coconuts, a sea shell and a single NIC that was washed up on the beach in the last storm. "
PRICELESS !!
@loopx: Honestly: return the USB NIC you just got, buy a compatible device(maybe an asus rt-n16) and install dd-wrt. You'll be a lot happier....
Last edited by Daniel_F (2011-01-10 00:34:08)

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

Is it possible to install Oracle RAC (11gR2)on server having just one NIC ?

Hi all,
Please let me know if it is possible to install Oracle RAC (11gR2) on server having just one NIC card on linux (RHEL5.8).
by creating a virtual NIC like the real ethernet is etho and we are creating eht0:1 as virtual NIC, and i want to use this as eth1, so please suggest me if this is the workaround for my issue or not.... if not please suggest me the best way to install RAC on physical linux box running with one NIC card.
Thanks
@ble

Check if this thread is relevant
Single NIC card and RAC ???
Thanks,
Ajay More
http://www.moreajays.com

DataSocket fails intermittently with multiple NICs enabled using LV7.1

Using LV7.1 and Datasocket v4.2, I was intermittently (but quite often) having problems reading and writing to the datasocket server (primarily from the server side). My application should read the value in the item and upon finding a specific string it should immediately follow it with a write of a default string. However, it can find the same string multiple times and not complete the write. Logging the errors from the write shows that no error is occurring. The client is not at fault because it only writes the string once every few minutes. I was able to finally show that by disabling the extra NIC on my system running the datasocket server that the connection seems to operate reliably. Both NICs
were set to static IP addresses, but only one was connected. I do have the program writing to "dstp://localhost/UUT" as opposed to a specific IP address (not sure if it matters).
With Labview6.1 I did not have this problem. It was only after I re-compiled my application with LV7.1 that I started having issues.

Philip,
I do not feel I am running out of bandwidth since I have run it successfully on 1Gbit NIC connections on a P4 2.4GHz system as well as a 10/100Gbit NIC on an old 650MHz system with LV6.1. I only do two writes per variable (on up to 8 variables) once every few minutes. I did not seem to be a re-entrant VI issue.
I have created two VIs which should allow you to recreate the failing conditions with multiple NICs enabled. It responds very quickly with one NIC enabled, but when one or two more NICs is enabled, it gets very slow to respond and has some timeouts.
One VI is the writer, the other is the reader. Start both VIs and start all 8 reader loops. Then you can consecutive
ly click on all 8 sender loops. Doing this with and without multiple NICs enabled should show you the problem.
Note: I think the issue I was talking about in earlier posts about getting multiple strings back before it wrote out "Loop" was due to the fact that the writes were not occurring quickly enough and the reads were happening multiple times. Therefore, in these VIs, I revised the read and close timeouts to -1.
I think it would be best if you could call me so we can discuss this issue. If you can email me, I will send you my contact information if you don't already have access to it.
Attachments:
ReadSocket_Multiple_MSHv1.vi ‏360 KB
WriteSocket_Multiple_MSHv1.vi ‏216 KB

Can't get internal vSwitch to route through external vSwitch to connect to Internet using one NIC on 2012 R2 Datacenter with Hyper-V

I'm running into a bit of a problem here.
I have the following two virtual switches setup on one 2012 R2 Datacenter Physical Host w/ one (1) physical NIC:
Physical Host is running 192.168.50.120, GW: 192.168.50.1, SM: 255.255.255.0 (Cisco Router has the IP of 192.168.50.1). The Internal vSwitch Network (will contain 8 VM Servers) is 192.168.1.1. I want the VM Servers on 192.168.1.1 to be able to get Windows
Updates by being able to route through the 192.168.50.1 vSwitch but yet, still want the Networks segregated.
Both of these virtual switches/networks will be running through one NIC.
I initially setup RRAS to use NAT but I'm not sure if this is the correct configuration. It seemed to work but when I went to Activate my Product Key (via MSDN Subscription) it wouldn't recognize the key and therefore I couldn't run windows updates.
However, when I set up two of the VMs on 192.168.1.1 to use DHCP through the 192.168.50.1 Network it would work fine (i.e. DHCP, DNS and GW were all set to 192.168.50.1).
Any ideas on what I might be doing wrong or how I could setup an effective route between the two networks?
Any and all ideas are most welcome and appreciated.
Sincerely,
Wallace
Wallace Davis

Hi nbk5533,
The external virtual switch and internal virtual are isolated, you must set RRAS to connect both network zone, you can refer the following article to connect the internal
switch and external virtual switch.
Configuring Hyper-V for multiple subnets with only one NIC (Server 2008 R2 Edition)
http://blogs.technet.com/b/letsdothis/archive/2012/01/08/configuring-hyper-v-for-multiple-subnets-with-only-one-nic.aspx
The similar thread:
RRAS in VM
http://social.technet.microsoft.com/forums/windowsserver/en-US/486bcbb4-bf01-4946-b103-cd896e9dafb9/rras-in-vm
More information:
http://msdn.microsoft.com/en-us/library/windows/hardware/gg605194(v=vs.85).aspx
Hope this helps.
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How to route traffic across subnets when one NIC is a hyper-V virtual switch?

Having a bit of a problem with a hyper-V environment which does not seem to route network traffic on two different subnets between each other.
If it were a purely physical server with two NICs and a gateway set traffic would automatically be forwarded between the two different subnets.
However when one of those NICs is a hyper-V virtual switch this simple routing no-longer seems to work and no traffic gets forwarded between subnets?
Situation is:
Hyper-V server with two NICs
NIC 1 = 192.168.0/24 - main Internal company network.
NIC 2 (hyper-V virtual switch.) = 192.168.1/24 - connects to ADSL internet router
Virtualized Domain Controller.
One or two virtualiszed NICs as necessary
How then does traffic get routed between these two subnets? If RRAS has to be configured to do this where is the best place to do it, on the hyper-V host or on the virtualized domain controller?
Thanks,

Hi ,
You can create an internal virtual switch and configure an IP for it (I assume it is 192.168.1.2/24) .
After you enable RRAS in hyper-v host there will be two gateways for different subnets .
" NIC 2 (hyper-V virtual switch.) = 192.168.1/24 - connects to ADSL internet router "
The problem is here ,if these VMs need to access internet .
So , these VMs can not configure their gateway same as the IP of internal virtual switch , you may set VM's gateway as the ADSL internet router's IP meanwhile add a static route entry for every VM .
Please refer to the Syntax :
route add -p 192.168.0.0 mask 255.255.255.0 192.168.1.2
Hope this helps
Best Regards
Elton Ji
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

In the bookmark panel, how can I close all bookmarks files with one click?

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IPad 3 with iOS 7: Any way to close/exit all apps with one action?

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VMM 2012 sp1: unable to create a logical switch on team with different nics (bug?)

Hyper-V Host is HP Proliant G7 with 4 onboard nics and additional (different) 4-port adapter, all 1Gbit. Server 2012 with latest updates.
VMM 2012 is sp1 with latest updates, server 2012 running in a vm.
When I create a logical switch with teamed uplink port profile in VMM, the job builds the team but fails to create the vswitch when ports from both onboard nics and adapter is used.
I am able to create a vswitch manually on the team if I do it directly on the host.
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I have tried assigning both nics in one step, and one by one. When I create the logical switch team with only one nic it succeeds, but then fails when I add the second (unless it is similar to the first).
Error in VMM is
Error (2912)
An internal error has occurred trying to contact the dkfuzhv01.mia.local server: : .
WinRM: URL: [http://dkfuzhv01.mia.local:5985], Verb: [GET], Resource: [http://schemas.microsoft.com/wbem/wsman/1/wmi/root/scvmm/ErrorInfo?ID=1010]
Unknown error (0x80041001)
Recommended Action
Check that WS-Management service is installed and running on server dkfuzhv01.mia.local. For more information use the command "winrm helpmsg hresult". If dkfuzhv01.mia.local is a host/library/update server or a PXE server role then ensure that
VMM agent is installed and running.
If I add the second non-similar team member from the host itself, I get this error from nic teaming wizard
Validation failed and changes to the system are rolled back
It is not a question of losing connection (been there), management interface is on a different team. And it also fails when second team member is added directly on the host...
So far I will stick to the conclusion that my problem is with logical switch and different nics :)
Oh, by the way nics are HP NC382i (Broadcom) and NC365T (Intel)

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J

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Javamail with 2 NIC, cannot connect to host port 25

Hi
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I tried disable the one to another network and my program can work. If both network connection is up, I received connection error to host at port 25.
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Regards,
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Follow the JavaMail FAQ tip for debugging connection problems by connecting with telnet,
if that fails as well, it's definitely a Windows problem.

SC 3.2 with one NIC

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