Communication between data centres

Hi,
I'm new to vCloudAir & I want to establish communication between 2 datacenters.
DataCenter.USA -> Gateway (public IP) -> NAT (private IP) -> <Server>, <Client1>
DataCenter.GER -> Gateway (public IP) -> NAT -> <Client2>
I'm trying to establish bi-directional connectivity between,
- server & client2
- client1 & client2
Please suggest.
Vinay

Hi Vinay.
You may want to have a look at the tutorials (here: Cloud Computing Tutorials | vCloud Air by VMware)
Particularly the NAT tutorial: Introduction to Gateway Services: Network Address Translation - VMware vCloud Air)
Consider also that you will need to configure the firewall services to allow / block traffic to/from those VMs.

Similar Messages

Data conversion for communication between Java and C/C++ program

The real problem, i guess, is about data type conversion between Java and C programs. For instance, and int is supposed to be 4 bytes in Java, and also in C/C++. But, as far as I know, the size of and int in C depends on the processors architecture, so if it were a 64 bit arch., size of and int, double, etc. in C, would change. The real scenario would be a communication between a 32 bit machine (Java) and a 64 bit machine (C/C++).
First of all, is this assumption correct?
If so,
how is it possible to deal with this problem in Java?
Is there any way to know 'type length' automatically? or
would it be necessary to modify the Java program to work with a C program in 32-bit or 64-bit arch?
thx in advance

cotton.m wrote:
Yes you should develop the C part of the protocol first and then build from there.
See http://forum.java.sun.com/thread.jspa?threadID=5243547 for a previous discussion of this topic.
I understand what you mean, also the topic you referenced. I will explain the situation a bit more. The protocol is already defined: (16 bits message size, 16 message id, 32 bit time, etc.); it is also defined in C (structures and so on). So it would be easy to write my Java code using the specified protocol in bytes, and C types wouldn't be necessary to be considered. But, let's say that the C code can't be modified, and I thought (and don't know yet if its correct), that size of C types CAN changed depending on architecture. So if size changes for C types (code is specified in short, int, etc, and not in bit format), it all would be a mess, if I don't implement something in my Java code.
cotton.m wrote:
I don't believe that 32 or 64 bit enters the equation here at all.Maybe 32 o 64 doesn't mind, but sparc or PC could take a point here. Communication would be between a sun solaris sparc and windows x86 PC. But if type size in C/C++ does not change, I wouldn't really have any problem then...
The situation is not ideal, I know, but is what I have; and I think I could have problems if I run the C program in other machines; so I would have to try to solve it whithin my Java Program.
I hope it is clear now what I need.
thx
Edited by: MGasa on Jan 16, 2008 1:51 AM

WAAS Mobile HA between 2 Data Centres

We have to deploy WAAS Mobile between 2 Data Centres, with remote user connecting to either DC across VPN & then connecting to a local WAAS Mobile server. We are trying to understand the best way to configure this from the available documentation on CCO.
We are a bit confused re the role of the WAAS Mobile Manager Server.
Is this similar to the role of Central Manager on normal WAAS, i.e configuration/management etc, or does it have any function in the selection of the server a client will connect to.
Regarding HA & Load balancing of the connections between the Data Centres, this is how we think we should deploy it!
Deploy a Server Farm at each DC & use the Latency based method of farm selection. This way the client should connect to the local server farm, based on which DC the VPN connects to?
Is this correct, has anyone deployed WAAS mobile in this way or have any advice?
Thanks
Colin

Fabricpath is L2; not related to the L3 technology you want to use; if VRF are in use you can just use VLANs which is described in your first scenario : "use 2 routers with VRF lite configuration in each DC, then dot1q on the trunk through the Fabric Path"

FabricPath & Layer-3 VPNs (VRF) between 2 Data Centres

Hi there,
I'm looking at deploying FabricPath for layer-2 extension between 2 Data Centres.
We also have the requirement for providing layer-3 services between the 2 DC, as in Layer-3 VPN (MPLS VPN).
The alternative technology was MPLS, with full blown Layer-3 VPN, and Layer-2 VPNs through AToM or VPLS.
My question is, how can we provide VRF support over FabricPath?? Can we use 2 routers with VRF lite configuration in each DC, then dot1q on the trunk through the Fabric Path? Or just VRF Lite on the layer-3 terminating routers, with a specific VLAN for interconnecting the different VRFs?
Thanks,

Fabricpath is L2; not related to the L3 technology you want to use; if VRF are in use you can just use VLANs which is described in your first scenario : "use 2 routers with VRF lite configuration in each DC, then dot1q on the trunk through the Fabric Path"

How to access a Network Share between two servers in same data centre

I have two dedicated servers (both Windows 2012 Server) hosted in a data centre somewhere. I want to share a folder on one server with the other server, but it's obviously not as straight forward as one might think. My servers are called "Maximus"
and "Apprentice".
On Maximus I shared a folder by right clicking on it and choosing "Share with... / Specific People", I then typed in the name of a local user account which also exists on Apprentice with the same name and password. (so each server has a local
user account with the same name and password).
So then on Apprentice, I was hoping I could access the share (while being logged in as this user with whom the folder was shared) by simply typing "\\ipaddress\sharename" into the address bar in file explorer. Unfortunately it comes
back with "Windows can not access [ip address]".
Now, I do have a website setup on the IP address for Maximus. This is actually the reason I want to create this share. I need the second server for load balancing and need to share IIS config as well as the website itself. (So I will need
two shares eventually, but for now I'm just trying to get one to work). I don't know if the fact that the ip address is pointing to the website is causing me problems here or if it's something else.
Are there any network gurus out there who can tell me what the issue is and how to resolve it?

I can ping both servers in either direction, but I believe I may have found the problem. Apparently my host is blocking port 445 which Windows wants to use to connect to the share and they will not unblock it.
Is there a way to connect to the share through a different port?
To my knowledge, you cannot change the port. However, you can try disabling your security software for testing. If this fixes the problem then you need to adjust your security software configuration so that traffic on this port is not blocked or filtered.
This posting is provided AS IS with no warranties or guarantees , and confers no rights.
Ahmed MALEK
My Website Link
My Linkedin Profile
My MVP Profile

Data Centre - Moving between

Hi,
I read somewhere "Business Catalyst does have plans to develop functionality that will allow templates to be transferred across data centres, but that is not currently available"
Is this true and does anyone have an idea of whether this is on the agend? E.g within 1 year or more like 5+ years away?
We have a private template that we would like on a local data centre but BC say they can't move it across and in terms of SEO we will be penalised as it's hosted in another country. If BC are working on being able to move then we are happy to wait but if they aren't i'd imagine the cost to recreate it on a new site would be a lot of work. Has anyone done this before?
Thank you

Hi there,
I know that site migration feature was worked on, but never completed. I don't why the development was postponed and when the feature will be released. You're probably looking at 2+ years.
In any case, since you can transfer almost all assets via FTP, you can get 80% of work done that way. The remaining 20% will be modules you have to recreate. and update the module IDs.
Cheers,
Mario

Communication between jsp and abstractportalcomponent

Hello All
Communication between jsp and abstractPortalComponent.
jsp contains one input text field and one submit button.
when the user clicks on submit button it will call the component and that input value will
display in same jsp page.
how this communication will happen?
Rgrds
Sri

Hi Srikanth,
In the JAVA File,
OnSubmit Event,
String inputvalue ;
InputField myInputField = (InputField) getComponentByName("Input_Field_ID");
if (myInputField != null) {
               inputvalue = myInputField.getValueAsDataType().toString();
request.putValue("textvalue", inputvalue);
request is IPORTALCOMPONENTREQUEST Object.
In JSP File,   to retreive the value,
<%
String textstring = (String) ComponentRequest.getValue("textvalue");
%>
In PORTALAPP.XML File,
<component name="component name">
      <component-config>
        <property name="ClassName" value="classname"/>
        <property name="SafetyLevel" value="no_safety"/>
      </component-config>
      <component-profile>
        <property name="tagLib" value="/SERVICE/htmlb/taglib/htmlb.tld"/>
      </component-profile>
    </component>
Using the code above, You can pass and read values between abstract portal component and Jsp Page.
Instead of this, I suggest you to use JSPDYNPAGE Component for Data Exchange.
Check the [Link|http://help.sap.com/saphelp_nw2004s/helpdata/de/ce/e0a341354ca309e10000000a155106/frameset.htm].
Hope this helps you.
Regards,
Eben Joyson

Communication between : AP and WLAN controller

Hi,
The communication between AP and WLAN Controller is ( Data and Control ) UDP.
Source port 1024 and destination port 12222 and 12223. Actually which device listen to which port or both should listen as control and data can be generated from both the devices.
How does the user ( wireless client) traffic is switched - if user traffic is a TCP traffic. It will be sent to WLANC and then WLANC forwards it to respective VLAN or default gateway ( depending upon the destination in the packet ).
Please explain / share the experience.
any link on cisco.com
Thanka in advance
Subodh

"the LWAPP Control and Data messages are encapsulated in UDP packets that are carried over the IP network. The only requirement is established IP connectivity between the access points and the WLC. The LWAPP tunnel uses the access point's IP address and the WLC's AP Manager interface IP address as endpoints. The AP Manager interface is explained in further detail in the
implementation section. On the access point side, both LWAPP Control and Data messages use an ephemeral port that is derived from a hash of the access point MAC address as the UDP port. On the WLC side, LWAPP Data messages always use UDP port 12222. On the WLC side, LWAPP Control messages always use UDP port 12223.
The mechanics and sequencing of Layer 3 LWAPP are similar to Layer 2 LWAPP except that the packets are carried in UDP packets instead of being encapsulated in Ethernet frames."
Taken from "Cisco 440X Series Wireless LAN Controllers Deployment Guide"

Communication between different JVMs

Hallo,
is there a simple way, to exchange data between different java sessions? At the moment I store the needed data to a table and load it in my java procedures when ever I need them.
But because this data is temporary, it wouldn't really be necessary to store the data. It's just for communication between the different JVMs. Is there an other way to do this, too?
Thanks, Christian

Christian, I may have misunderstood your question, but, until java version 1.4, the only way for different JVMs to communicate was via sockets, or secondary storage (the file system -- which includes databases).
In java version 5.0 (previously version 1.5), there is a new feature known as class data sharing.
But since you posted to the "Database >> JVM" forum, I can't help thinking that you are referring to different database JVMs. Is that correct? In any case, sockets and secondary storage are your only options there as well.
Good Luck,
Avi.

Communication between ECC and CRM

Hello,
I am in phase of showing communication between SAP CRM 5.0 and ECC 6.0.
I am struggling with finding some simple transactions which are common in both, with which I can show correct connectivity between ECC and CRM.
I need to save some data from CRM and access the same via transaction within ECC, save some data via ECC and access it via CRM. I already established RFC link between ECC and CRM.
Probably communication between SD module of ECC with CRM.
Can you please help me out with this, a clue/correct direction will be of very helpful. Basically I want to know, what transaction I can use for same.
Any help is really appreciated.
Thanks
-Vishal

Hi Glenn,
I followed all steps in document mentioned above. In the end during execution of transaction I selected appropriate source and destination, when I click start transfer objects, it gets stuck in waiting phase.
Among those steps I was not able to perform step#10. Creating Subscriptions for OLTP. My ERP is not displaying this option under subscription wizard. Should it be reason for not starting transfer ? I also do not see ERP logon screen when I select transfer.
My another question is when transfer will complete, where I'll be able to see transferred objects within ERP database ?
Thanks
-Vishal

Communication between non SAP and SAP

HI,
do you have some information about communication between non SAP and ERP (WebAs) SAP System ?
I would like to receive an xml file or xml IDoc from a Java Plattform (non SAP) into our SAP ERP System as an own defined IDoc.
remember: we don´t have a converter like XI.
What about using a proxy (do you have some information/blog how to use that) ?
What about using a webservice (do you have some information/blog how to use that) ?
What about storing the xml on the application server (do you have some information/blog how to use that) ?
How to transform xml to IDoc ?
other methods ?
Thanks for your help.
Gordon

Here is a link to connecting MS SQL Server with SAP using Open Hub connection.
http://msdn.microsoft.com/en-us/library/dd299430(SQL.100).aspx
This might give you some insight into connecting with Non SAP Systems.
I have used the information from this link to export data from SAP to MS SQL Server.
Good Luck.
MP.

Communication between APs and controlleurs under 100ms

I heard from a Cisco representative that communication between the APs and the controlleur(s) should be less than 100ms. Did anyone experienced problems by not respecting that restriction?
This restriction would have an impact on our design. Originaly we were planning to host the controlleurs as well as the WCS on our datacenter and have the APs communicate with the controlleurs/WCS via WAN. We would like to avoid having a controlleur for each site since the sites won't need more than 5-6 APs each...

Hi Mehdi,
Have a look at the specs in this H-Reap design guide. It may help explain this restriction and the effect it will have on the "Wireless Rollout";
H-REAP WAN Considerations
Because the H-REAP has been designed specifically to operate across WAN links, it has been optimized for such installations. Though H-REAP is flexible when it comes to these remote network design scenarios, there are still a few guidelines that need to be honored when architecting a network with H-REAP functionality.
H-REAPs may not be placed across WAN links any slower than 128 kbps.
Roundtrip latencies between H-REAP and the controller may not exceed 100 ms.
Between the access point and the controller, a minimum of a 500 byte MTU is supported.
In order to ensure that support for this stated latency limitation is in place, it is strongly recommended that between the access point and controller, priority be configured in the intermediary infrastructure to elevate LWAPP control (UDP port 12223) to the highest priority queue available. Without priority placed on LWAPP control, spikes in other network traffic will very likely cause H-REAP access points to frequently shift from connected to Standalone modes as WAN link congestion prevents access point/controller messages (and keep-alives) from being delivered.
Frequent H-REAP flapping causes serious connectivity issues. Without proper network prioritization in place, it may be prudent to place controllers at remote sites to ensure consistent and stable wireless access.
Note: Whether H-REAP is configured to tunnel client traffic back to the controller or not, the LWAPP data path is used to forward all 802.11 client probes and authentication/association requests, RRM neighbor messages, and EAP and web authentication requests back to the controller. As such, ensure that LWAPP data (UDP port 12222) is not blocked anywhere between the access point and controller.
From this good doc;
http://www.cisco.com/en/US/products/ps6521/products_tech_note09186a0080736123.shtml#t7
Hope this helps!
Rob

Communication between PC/RM Backend and ERP System

Hi,
Is it possible to have communication between PC/RM Backend and ERP System by cresting RFCUSER with user type communications data instead of Dialog user.
Because of audit policy , none of DIALOG user should have SAP_ALL profile.
Is there a option to set up communications between PC/RM Backend and ERP System without a Dialog user setting.
Pravin

Hi Pravin,
You are right and the user should be always communication or system. GRC AC allows for the user to be communication or system. Can you try with PC/RM RFC user and see if it works? It should work
Alpesh

Communication between the primary server the gateway server

hallo
Can I set the directional communication between the primary server the gateway server, so it feels by the following example?
And if so how?
Agent
à GW
ß GW
ß MS
*Agent communicates with GW1 and reported it
*GW SEND report to GW2
*GW2 Send the the data to MS
thanks
<o:p></o:p>
אם תגובתי פתרה את בעייתך - לחץ/י, על "סמן כתשובה" ליד סימן ה V הירוק.

Hi,
As far as I know, Gateways dont talk to each other. Why you need two GW, with one GW and report to your management servers, this way should work.
Here is a similar thread for your reference:
https://social.technet.microsoft.com/Forums/systemcenter/en-US/323d5aab-bad4-4c23-b096-27a62757ae31/communications-between-2-gateway-servers-and-2-ms?forum=operationsmanagerdeployment
Regards,
Yan Li
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected]

Encrypting communication between an app that uses an ODBC/DSN (with ADODB) and SQL Server 2008 R2

I've been doing a lot of reading the last couple of days on how we can encrypt db communication between our product app and a customer's SQL Server db, but cannot make it work as expected. The app uses a ODBC/DSN to connect to the SQL Server db. I use this
ODBC app to setup the DSN (on a Windows 7 PC):
C:\Windows\SysWOW64\odbcad32.exe
The DSNconnection uses the SQL Server driver 6.01.7601.17514 and has these properties:
- WinNT authentication.
- Client Config button: TCP/IP to <server-name>\<instance.-name>
- Change to default db: <name-of-app-db>
- Everything else is default setting.
SQL Server is on the same Windowns 7 PC and has a self-signed cert installed (used IIS to generate it) and has the Force Enryption set to "yes".
I have a test C# program that uses the ADODB 2.7.0.0 COM-wrapper, made by Visual Studio after adding a reference to the ADO 2.7 library version 6.1.7601.17857. The program creates an ADODB.Connection object that has a simple connection string: "DSN=<san-name>;UID=<user>;PWD=<password>". The
program then creates an ADODB.Recordset object and reads and displays a field from a table.
Works fine.
If I go into SQL Server and set Force Encryption to "no," clear the cert, restart the SQL service, and then re-run the program, it works fine.
Here's the kick. If I go into the DSN and select "Use strong encryption for data" the Test button on the DSN works—why does it work? The SQL Server is no longer encrypting the connection so an error should occur. If I run the test program, it works
as well—why? I can look at the connection properties in the test program and see that ADODB has added the ";Encrypt-yes" stuff to the end of the connection string. Yet that option seems to have no effect.
If I set the SQL instance back to Force Encryption:yes, enable the cert, restart the SQL service, and clear the DSN's "Use strong encryption for data" option, I can still connect to the db with the
test program—why?
What am I doing wrong? I need to be able to ensure that the communication between our app product and the SQL instance is encrypted, and that we get an error if the SQL instance does not support encrypted communications. We really don't want the customer
to have to enable Force Encryption because they have other db's on their SQL Server that do not use encrypted communication, but they want to know that our product's communication channel with the db is encrypted.
No, I can't change the app product's code at this point in time. I'm stuck with working with what a DSN called from ADODB has to offer.
Also, how can I be sure that communications are encrypted? I mean, I've tried things like "SELECT * FROM sys.dm_exec_connections" but that doesn't help because I have no idea how to tie the list of sessions shown back to my test program, although
I guess it's a good thing that some of the sessions listed show encrypt_option as TRUE.
-glenn-

Ah yes, very good point. It's easy to miss because you have to delete then recreate the DSN in order to change drivers. So I switched the DSN over to the SQL Native 11 driver.
Now when I try to connect to the SQL instance as <computer-name>\<instance-name>, and without a cert on the server, I get "the target principal name is incorrect". Perfect; now we're getting somewhere!
Change my DSN to use <fqdn>\<instance-name> and it works. This tells me that SQL Server has auto-generated a cert and named it <fqdn>. I would have expected the "cert fail" error, not a cert
name mismatch, because I'm not using Trust Server Cert.
So I load up my self-signed cert, and that works too.
I am still confused as to why I'm not seeing the "cert fail" error when I have no cert loaded on the SQL Server. I am not using Force Encryption on the server at all, so wouldn't expect SQL Server to auto-create a cert when an Encrypt=yes request comes in,
but apparently it does?
I also ran into a problem with this:
select c.session_id, c.encrypt_option, s.client_interface_name
from sys.dm_exec_connections c
join sys.sysprocesses s
on c.session_id = s.session_id
where s.dbid = db_id('MyDatabase')
There is no s.client_interface_name, probably should be s.hostname. There's also no s.session_id. I thought maybe this should be s.sid, but then no rows ever come back. The c.session_id looks like 51 and 52, but the s.sid looks like a very long binary number,
so these two fields cannot be joined. I don't know how to convert the sid's properly so that the join would work. Ah wait, I just found the s.spid column; the join works when that column is used (I assume that's correct anyhow).
If I add a Thread.Sleep(30 seconds) to my C# program just before the connection is closed, this query shows me the session for the correct hostname has encrypt_option=TRUE.
And I have to keep my fingers crossed that all the app I/O will still work properly after
changing the driver. Probably a safe bet though.
Think I'm ready to throw in the towel on getting the "cert fail/no SSL" error to appear.
It does look like I am able to sufficiently show that the connection is encrypted when Encrypt=yes is used with the newer driver.
Thank for all the help!
-glenn-

Communication between data centres

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