Tuesday, June 30, 2015

KEMP LoadMaster as Reverse Proxy for Lync/Skype4B Server



In this articleI will show how to configure KEMP LoadMaster HLB to act as Reverse Proxy for Lync  / Skype for Business server.

The topic of Reverse Proxy always have been the “weakest links” in the entire Lync/Skype4B installation journey for two reasons. First, people have a hard time grasping the basic concept why Reverse Proxy is necessary and second – what solution to use. Let’s take on each topic.

Reverse Proxy


Lync (Front End and Director role) have two web sites – Internal and External.


In Topology, the two web sites are bind to different ports


There is good reason for that – a request for web service might come from Inside (LAN) or Outside (Internet) and the server must respond accordingly. Think about meeting join – when we click Join Lync/Skype meeting link, a DNS query for meet.contoso.com will be made, and an IP address will be returned – either internal or public depending of which DNS we query. Based on our location, the server will “answer” with internal or external pool web services FQDN where the meeting will be hosted and we will join the meeting. So, the only way to “let” the server know where we are coming from is to… land on the appropriate web site. We cannot “choose” where to make the request (to the internal site if we are on LAN or the External site, if we were on Internet). Since in Meeting Invite we see only one web link https://meet.contoso.com/user/meeting (and HTTPS implies use of port 443), the only way we “land” on port 4443 (where the external site is bind) is to “flip” the traffic arriving on port 443 to port 4443.

One might say – but we can do that on our firewall with port forwarding. While true, it is not recommended for many reasons. To state one – certificates. Think about it – internal web services are bind to certificate issued by Internal CA. If we just do port forwarding, the HTTP request will be terminated with this internal certificate and unless the workstation have the Internal CA Trusted Root, and eventually internal Intermediate certificate(s), the SSL request will fail. In this case, how someone can join meeting from non-corporate laptop? Simple answer – it cannot.

So, to recoup - Reverse Proxy is the place where we terminate the SSL request with Public certificate, “flip” the port from 443 to 4443 and “proxy” the connection to Lync server. Server replies to RP on port 4443, RP “flips” the port again to 443 and replies to our request.

What software to use as Reverse Proxy


There are many "solutions" out there. I must emphasize on one thing – always use product from this list: https://technet.microsoft.com/en-us/office/dn788945. Only qualified products are thoroughly tested and any future Lync/S4B Cumulative Update and/or Product update will be aligned and validate prior to release. I have seen many cases where non-qualified product is updated and some or all  functionality is no broken, causing grief with both users and administrators.


Kemp LoadMaster



As I said in the beginning, this article is about KEMP. The primary reason – as of now, Kemp Technologies offers free LoadMaster: http://freeloadbalancer.com. Be not confused by the name “loadbalancer” – every HLB can act as reverse proxy and this is what we will do today.

First, of course, we need to register for KEMP ID. We will use this ID later to license the appliance and unlock the features. Once done, we are taken to the Download page.



Here, for this exercise I will use VMware OVF, but KEMP offers Virtual Alliance for many different platforms.


While deploying the OVF template, make sure the network adapter mapped to your DMZ subnet..


Here is the original settings after the VM was added. Note that both network adapters are on DMZ


We want the second network adapter on our server network


We are now ready to power the VM


As we see, the VM is configured with default IP 192.168.1.101, user name - bal and password - 1fourall.


Before we access the appliance via web browser, let's do some initial configuration. Login to the console with the default credentials. Change the IP address (if you wish to do so). I will use 192.168.1.111


Configure default gateway


and DNS



We are now ready to complete the configuration via web browser.



Accept the EULA, on the next screen select “Free LoadMaster”and click Allow.



Now we are taken to the licensing screen. Here we will use our KEMP ID.





We must change the password.


...and now our KEMP is licensed and features are unlocked.

Configuration


There are three steps involved – Install Templates (for automatic configuration), Install public certificate (to provide connectivity to non-corporate devices) and configure Virtual Service (the actual Reverse ProxyP)

KEMP Templates

When comes to Lync web services and HLB/RP, we have very specific requirements that must fulfill. The list can be found here: https://technet.microsoft.com/en-us/library/jj656815%28v=ocs.15%29.aspx?f=255&MSPPError=-2147217396

From my past experience, I can tell you that 99% of the issues were around missing/misconfigured parameters. Luckily for us, KEMP does offers the so called Templates: http://kemptechnologies.com/loadmaster-documentation/#c7842 – which, when used, will configure your new Virtual Service with all parameters as per TechNet. We will see this in the next step.

Download Lync 2013 Templates http://kemptechnologies.com/files/assets/templates/Lync2013.tmpl to your computer. In KEMP GUI, navigate to Virtual Services -> Manage Templates





Browse to the file we downloaded on the previous step and click Add New Template




As we can see, we have templates for all possible scenarios this Virtual Appliance can be used in our Lync environment.

Certificates


As I mention above, we will configure Reverse Proxy to serve request from Internet and so, we need to configure KEMP with Public certificate in order Mobile devices to trust. I will use Wild Card certificate for my domain issued by DigiCert. I already have the certificate exported in .pfx format (private key included).

In KEMP, navigate to Certificates -> SSL Certificates



Click Import Certificate



Browse to the .pfx file, enter password and make sure Certificate Identifier is one word (KEMP does not like white spaces) and Save.



***Next step is very important. Since this certificate is issued by Public Authority, we must also import any intermediate certificates that could be in the certificate chain. To do so, open the certificate in MMC and go to Certification Path tab. Here we see one Intermediate and one root – both must be imported.



I will find the root and the intermediate in my Local Computer Certificate store and export them in Base-64 encoded format (DER will not work on KENP). Then I will import those by clicking Add Intermediate button. Here is the final result




Configuring Virtual Service

In the initial configuration steps I have configured the appliance with IP address from DMZ. However, the Virtual Service must be able to connect to our Real Servers and so, I must configure the second virtual NIC with IP from the server subnet.

Go to System Configuration, Interfaces, eth1 and configure IP address/Subnet (don't forget to click Set Address)



Now we can create new virtual service using Template. Navigate to Virtual Service, Add New. Give it an IP address, select Lync Reverse Proxy 2013 from the “Use template” drop-down menu and click “Add this Virtual Service”. The IP address is any available IP on our DMZ network. At the end, this DMZ VS IP wil be mapped 1:1 to Public IP address.




You will be taken to the configuration screen for the 443 service (there was one more for port 80 which we don’t see right now) where we will complete the configuration.



What’s left is to configure the service with certificate and add the Lync servers. Expand SSL Properties, highlight the certificate you want to assign and move it to the “Assigned Certificates”. Don’t forget to click Set Certificates button or the change will not be applied.



Expand “Real Servers”



Click “Add New” and enter the IP address of the Lync server, make sure the Port is set to 4443 (remember, we have to hit the External web site which runs on 4443) and click “Add This Real Server” button.



 Repeat for all servers in your pool if you have EE pool.

Now click View/Modify Services on left...


...and you should see the Status as Up (green.) This indicates the the Virtual Service connected to the Lync servers and it is ready to go.


The service for port 80 is Down (red) because we have not added "real Servers" yet. Click Modify under Action column, Add New under Real Servers...



...add the IP addresses of the Lync servers again (make sure Port is set to 8080)


and the final result should be - all Green.


That's all, folks. Really! Configure your NAT, Firewall and DNS and test your new Reverse Proxy. I guarantee it will work.

If or when time permits, I will show you how you can use KEMP to serve multiple services with one  IP address. In my lab I use for Exchange, two EE pools and one SE Lync pools, ADFS and more with one single IP address.

139 comments:

CP said...

Thanks for writing this, however it seems most RP deployments keep both legs in a public/private DMZ instead of DMZ/Internal. I think this post would be more beneficial if you showed how to configure the KEMP for that scenario. Additionally doesn't the KEMP need the internal private CA root cert loaded at some point since the internal Lync web services use a private cert? These are all steps we had to do for TMG, and am interested in seeing it done in Kemp as well.

Drago said...

On the certificate - because we use public cert, the (real) servers trust this cert natively. Furthermore the VS does not decrypt and re-encrypt the traffic (no longer required for 2013/Skype4B).

Yes, I did a mistake showing the IP address of the Virtual Service as LAN IP (should be DMZ IP) and will correct this right now. Thanks for catching that!

As for both legs on Public/DMZ... KEMP do require that an interface is configured with IP on the same subnet as the real servers. Not sure why is that.

CP said...

Found a previous article that applies. I would think most security teams will require the RP to not "dog-leg" into the LAN. I know mine does. The article below is the only KEMP-Lync post I've seen about how to do this with KEMP. Hope it helps!

Excerpt from this article: http://unifiedme.co.uk/2014/03/configuring-kemp-reverse-proxy-lync-exchange-server/

"In developing the KEMP VLM to support a reverse proxy configuration, KEMP did not anticipate a network topology in which the KEMP is positioned between two perimeter networks (e.g. ‘DMZ-External’ and ‘DMZ-Internal’). Instead, the KEMP assumes a ‘dog leg’ topology in which the internal adapter is directly connected to the internal LAN (or, more accurately, the same subnet that published servers are hosted on – typically the LAN). However, working directly with KEMP technical support we were able to arrive at a configuration that supports an ‘external’ (Internet-facing) and ‘internal’ (LAN-facing) perimeter network, although this is not documented. Such a configuration allows traffic to be subject to separate inspection from the Internet to the KEMP and from the KEMP to the LAN (and vice-versa) and from a security perspective this is much preferred to the ‘dog leg’ short-circuit topology. To support two perimeter networks, the following configuration must be created on the KEMP:

a. VS definitions must be created that operate on the external adapter (e.g. eth0). These must be configured to simply forward all traffic to corresponding VSs defined on the internal adapter (e.g. eth1). In this way, the KEMP is configured to proxy traffic from its external adapter to its own internal adapter. A corresponding VS configured on the internal adapter is then configured to receive the traffic and perform SSL bridging, Edge Security Pack (ESP) filtering etc. to and from the published server(s) on the internal LAN. This configuration is necessary to ensure that the KEMP sends traffic to internal servers from its internal interface IP address (e.g. eth1). By default, if a VS is defined only on the external adapter (per the KEMP documentation), the KEMP will indeed send traffic from its internal adapter but the source IP address will be that of the external VS (i.e. from the external perimeter network – eth0). This will cause the firewall to drop the traffic as IP address spoofing will be detected. You can see how the KEMP engineering team did not anticipate a ‘dual perimeter network’ topology.

b. ‘Enable non-local real servers’ must be enabled under Network Configuration if the KEMP is located between two perimeter networks and the published Web servers exist on a remote subnet. If this option is not ticked, it will not be possible to select the option ‘Non-local Real Server’ when subsequently specifying a Real Server under Virtual Server configuration settings. Again, you can see how the KEMP assumes the device will be connected to the published server LAN in most scenarios (just like load usually balancers are… :) ).

c. The VS must be configured with transparency disabled. This is also necessary to allow a non-local Real Server IP to be specified."

Drago said...

Another excellent find!. Frankly, what prompted me to write this article is "quick and dirty" on getting lab up and running.

Anu said...


Really nice information you had posted. Its very informative and definitely it will be useful for many people
iOS Training in Chennai
Android Training in Chennai
php Training in Chennai

Unknown said...

Thank you for benefiting from time to focus on this kind of, I feel firmly about it and also really like comprehending far more with this particular subject matter. In case doable, when you get know-how, is it possible to thoughts modernizing your site together with far more details? It’s extremely useful to me

python training in omr

python training in annanagar | python training in chennai

python training in marathahalli | python training in btm layout

python training in rajaji nagar | python training in jayanagar

simbu said...

Very good brief and this post helped me alot. Say thank you I searching for your facts. Thanks for sharing with us!
java training in omr

java training in annanagar | java training in chennai

java training in marathahalli | java training in btm layout

java training in rajaji nagar | java training in jayanagar

Unknown said...

Excellant post!!!. The strategy you have posted on this technology helped me to get into the next level and had lot of information in it.
Data Science Training in Chennai
Data science training in bangalore
Data science online training
Data science training in pune
Data science training in kalyan nagar
Data Science with Python training in chenni

sai said...

Just stumbled across your blog and was instantly amazed with all the useful information that is on it. Great post, just what i was looking for and i am looking forward to reading your other posts soon!
python training in rajajinagar
Python training in btm
Python training in usa

Revathy A said...

This is my 1st visit to your web... But I'm so impressed with your content. Good Job!
angularjs Training in chennai
angularjs Training in chennai

angularjs-Training in tambaram

angularjs-Training in sholinganallur

angularjs-Training in velachery

cynthiawilliams said...

Excellent and useful blog admin, I would like to read more about this topic.
RPA Training Course
RPA Training Institute in Chennai
DevOps Training in Chennai
AWS Training in Chennai
Angularjs Training in Chennai
ccna Training in Chennai

w3webschool said...

Excellent informative blog, Thanks for sharing.
Wedding Photographer

DeepikaOrange said...

I would like to say thank you for the amazing details and concepts you are sharing in this.

Oracle Performance Tunning Training in Chennai
Oracle Performance Tunning Training

Ashutosh Singh said...

I am reading a blog on this website for the first time and I would like to tell you that the quality of the article is up to the mark it is very well written.
Quicken Customer Support Phone Number
QuickBooks Payroll Support Phone Number
Digital marketing course in Delhi
Web Designing Company

Sumaya Manzoor said...

Your article increases the curiosity to learn more about this topic. Keep sharing your information regularly for future reference.

Selenium training in Chennai
Selenium Courses in Chennai
best ios training in chennai
Digital Marketing Training in Chennai
JAVA J2EE Training Institutes in Chennai
Best Android Training institute in Chennai
Android Training Institutes in Chennai

yuvaprithika said...

This is really too useful and have more ideas and keep sharing many techniques. Eagerly waiting for your new blog keep doing more.
Java Training Center in Bangalore
Core Java Training in Bangalore
Best Java Training in Bangalore
best hadoop training institutes in bangalore
best big data training in bangalore
hadoop classes in bangalore
hadoop institute in bangalore
Aws Training Institutes in Bangalore
Aws Certification Training in Bangalore

Vicky Ram said...

Thanks For Your valuable posting, it was very informative

toorizt
Article submission sites

Anbarasan14 said...

Thanks for sharing steps. This is really helpful. Keep doing more.

Spoken English Classes in JP Nagar
English Speaking Course in Bangalore JP Nagar
Spoken English Classes in JP Nagar Bangalore
Spoken English Training Institute near me
French Language Classes in Bangalore JP Nagar
French Training in JP Nagar Bangalore
French Coaching Center in JP Nagar

svr said...

Great Article… I love to read your articles because your writing style is too good, its is very very helpful for all of us and I never get bored while reading your article because, they are becomes a more and more interesting from the starting lines until the end.
datapower tutorial video

mercyroy said...

More informative,thanks for sharing with us.
this blog makes the readers more enjoyable.keep add more info on your page.
Java Courses in Sholinganallur
Java Training in Guindy
Java Training institute in Anna Nagar
Best Java Training Institutes in Bangalore

Harish said...

You have explained the topic beautifully. Keep sharing more post in your blog.

Spark Training in Chennai
Spark Course in Chennai
Spark Training
Spark Training in Velachery
Spark Training in Adyar
Spark Training in Tambaram

Unknown said...

Wow..Nice post and its really informative and useful.Thanks for posting..keep update php training in chennai
php training in velachery chennai
php course fees in chennai
best php training institute in chennai

Gautam krish said...

Best blog, Thanks for your information
Ethical Hacking Course in Coimbatore
Hacking Course in Coimbatore
Ethical Hacking Training in Coimbatore
Ethical Hacking Training Institute in Coimbatore

VenuBharath2010@gmail.com said...

You are an awesome writer. The way you deliver is exquisite. Pls keep up your work.
Spoken English Classes in Chennai
Best Spoken English Classes in Chennai
Spoken English Class in Chennai
Spoken English in Chennai
Best Spoken English Class in Chennai
English Coaching Classes in Chennai
Best Spoken English Institute in Chennai
IELTS coaching in Chennai
IELTS Training in Chennai

vijaykumar said...

im really proud to read a resonable article.in recent days i search a this much of article finally i found it.thanks.
AngularJS Training institute in Chennai
Angular 6 Training in Chennai
Angular 5 Training in Chennai
ReactJS Training in Chennai
Data Science Training in Chennai

jvimala said...


Very Clear Explanation. Thank you to share this
Regards,
Data Science Course In Chennai
Data Science Course Training
Data Science Training in Chennai
Data Science Certification Course

priya said...

A very nice guide. I will definitely follow these tips. Thank you for sharing such detailed article. I am learning a lot from you.
Data Science course in rajaji nagar
Data Science with Python course in chenni
Data Science course in electronic city
Data Science course in USA
Data science course in pune | Data Science Training institute in Pune
Data science course in bangalore

rohini said...

Authorized iphone service center in Chennai | iphone service center in chennai | Mobile service center in chennai | Authorized iphone service center in Chennai | iphone service center in chennai

ajay prakash said...

It was really an interesting blog, Thank you for providing unknown facts.
Aviation Academy in Chennai
Air hostess training in Chennai
Airport management courses in Chennai
Ground staff training in Chennai
Aviation Courses in Chennai
best air hostess training institute in chennai
diploma in airport management in chennai
airport ground staff training courses in chennai

karthick said...

Very valaid information. keep sharing

SAS Training in Chennai

Rithi Rawat said...

Nice Article..I love to read your articles because your writing style is too good, its is very very helpful for all of us and I never get bored while reading your article because, they are becomes a more and more interesting from the starting lines until the end.

Check out : machine learning tution in chennai
artificial intelligence and machine learning course in chennai
best training insitute for machine learning

VenuBharath2010@gmail.com said...

You are an excellent writer. Amazing use of words. Waiting for your future updates.
Blockchain certification
Blockchain course
Blockchain Training
Blockchain Training Institutes in Chennai
Blockchain course in Tambaram
Blockchain course in Velachery

Jagadeesh said...

Great post thanks,
Learn Digital Academy offers, Digital marketing courses in Bangalore
Training program, practically on Live Projects.

Jagadeesh said...

Great post thanks,
Learn Digital Academy offers, Digital marketing courses in Bangalore
Training program, practically on Live Projects.

Aaditya said...

Great post, I am impressed by the information that you have on this blog. It shows how well you understand this subject.

ExcelR Data Science Course in Bangalore

Unknown said...

Learn Digital Academy Offers, Digital Marketing course in Bangalore.
Get-in depth knowledge.
Learning experience involves Training, Certification, internships, and Placement.
Strategies into practice.
https://www.learndigital.co/

zaintech99 said...

thanks for sharing informative article.
top 7 best washing machine

creative web solution said...

Get the best nursing services baby care services medical equipment services and allso get the physiotherapist at home in Delhi NCR For more information visit our site

nursing attendant services in Delhi NCR
medical equipment services in Delhi NCR
nursing services in Delhi NCR
physiotherapist at home in Delhi NCR
baby care services in Delhi NCR





lucy88 said...

Just saying thanks will not just be sufficient, for the fantasti c lucidity in your writing. I will instantly grab your rss feed to stay informed of any updates.
Data Science Courses

Kerrthika K said...

It's a precious blog! I have learned so many useful contents from your blog.. Thanks for sharing this information.
Node JS Training in Chennai
Node JS Training Institute in chennai
ionic course in chennai
IoT courses in Chennai
Xamarin Course in Chennai
Node JS Course
Big Data Analytics Courses in Chennai
Node JS Training in Tnagar
Node JS Training in Vadapalani
Node JS Training in Thiruvanmiyur

Christoper stalin said...

Thanks for giving this blog for us.
web designing course with placement
php course in chennai
magento course in chennai

Rajesh said...

thanks for sharing this information
best data science training institute in bangalore
best data science training in bangalore
tableau classroom training in bangalore
python training in bangalore
best python training institute in bangalore
python training in jayanagar bangalore
Artificial Intelligence training in Bangalore
data science with python training in Bangalore

Aruna Ram said...

Thank you for developing this fabulous information and this is very useful for me. I liked your post and keep doing...!
Spark Training in Chennai
Spark Training Fees in Chennai
Appium Training in Chennai
Tableau Training in Chennai
Oracle Training in Chennai
Oracle DBA Training in Chennai
Linux Training in Chennai
Embedded System Course Chennai
Excel Training in Chennai
Spark Training in Vadapalani

IT Tutorials said...



Get the most advanced Python Course by Professional expert. Just attend a FREE Demo session.
For further details call us @ 9884412301 | 9600112302
Python training in chennai | Python training in velachery

corporate training said...

corporate training

Priyanka said...

Attend The Artificial Intelligence course in bangalore From ExcelR. Practical Artificial Intelligence course in bangalore Sessions With Assured Placement Support From Experienced Faculty. ExcelR Offers The Artificial Intelligence course in bangalore.
ExcelR Artificial Intelligence course in Bangalore

digitaltucr said...

I finally found great post here.I will get back here. I just added your blog to my bookmark sites. thanks.Quality posts is the crucial to invite the visitors to visit the web page, that's what this web page is providing.
ExcelR artificial intelligence course in bangalore

Reshma said...


Amazing Post. keep update more information.
Aws Training in Hyderabad
Aws Course in Hyderabad
AWS Training in Chennai
Aws training in bangalore
Aws training in coimbatore
AWS Course in Chennai
AWS Certification in Chennai
Best AWS Training in Chennai
Amazon web services Training in Chennai

Gowtham said...

I think this is a great web site to post and I have read most of the contents and I found it valuable for my future. Good work and Keep going.
Excel Training in Chennai
Excel Advanced course
Pega Training in Chennai
Linux Training in Chennai
Job Openings in Chennai
Tableau Training in Chennai
Unix Training in Chennai
Oracle Training in Chennai
Soft Skills Training in Chennai
JMeter Training in Chennai
Excel Training in OMR

Durai Moorthy said...

This is an awesome blog. Really very informative and creative contents.

aws Training in Bangalore
python Training in Bangalore
hadoop Training in Bangalore
angular js Training in Bangalore
bigdata analytics Training in Bangalore
python Training in Bangalore
aws Training in Bangalore

sindhuvarun said...

Thanks for sharing this useful information..
AWS Training in Chennai
AWS Training in Bangalore
AWS Training in Coimbatore
AWS Training in Hyderabad
Data Science Courses in Bangalore
Devops Training in Bangalore
AWS Course in Chennai
AWS Course in Bangalore
AWS Course in Coimbatore
AWS Course in Hyderabad

shakeel1995 said...

Awesome Blog With Good Information...
salesforce course in hyderabad with placements
devops online course
full stack java training

Naveen said...

Here is the details of B.Sc Perfusion Technology colleges in Bangalore. If you are looking to study BSc Perfusion Technology in Bangalore, the below will help you to find the best Perfusion Technology colleges in Bangalore.
BSc Perfusion Technology Colleges in Bangalore | Perfusion Technology Colleges in Bangalore |BSc Cardiac Care Technology Colleges in Bangalore | Cardiac Care Colleges in Bangalore |BSc Respiratory Care Technology Colleges in Bangalore | Respiratory Care Colleges in Bangalore |BSc Renal Dialysis Colleges in Bangalore | Renal Dialysis Technology Colleges in Bangalore |BSc Optometry Colleges in Bangalore | Optometry Colleges in Bangalore |BSc Medical Imaging Technology Colleges in Bangalore | Medical Imaging Technology Colleges in Bangalore |

Rajesh Anbu said...

aws Training in Bangalore
python Training in Bangalore
hadoop Training in Bangalore
angular js Training in Bangalore
bigdata analytics Training in Bangalore
python Training in Bangalore
aws Training in Bangalore

Rajesh Anbu said...

Thanks for this wonderful blog it is really informative to all.keep update more information about this
aws Training in Bangalore
python Training in Bangalore
hadoop Training in Bangalore
angular js Training in Bangalore
bigdata analytics Training in Bangalore
python Training in Bangalore
aws Training in Bangalore

Riya Raj said...

Great info. The content you wrote is very interesting to read. This will be loved by all age groups.
DevOps Training in Chennai
Best DevOps Training in Chennai
DevOps Training institute in Chennai
VMware Training in Chennai
DevOps Training in Velachery
DevOps Training in Tambaram
DevOps Training in Adyar
DevOps Training in Vadapalani

Ismail said...

Great Article. Thank you for sharing! Really an awesome post for everyone...
Data Science Training in Bangalore

Gayatri said...

Thanks FOr taking efforts and sharing so much information with us
python certification training in Bangalore
Blockchain training in Bangalore

RIA Institute of Technology said...

Great post!! Thanks for sharing...
Python Training in Bangalore

chandhran said...


It is an excellent blog. Your post is very good and unique.
DevOps Training in Bangalore
Best DevOps Training in Bangalore
DevOps Course in Bangalore
DevOps Training Bangalore
DevOps Training Institutes in Bangalore
DevOps Training in btm
Best DevOps Training in Chennai
DevOps Training institute in Chennai
Spoken English Classes in Bangalore
ielts coaching in bangalore

subha said...

this is very good post bundle of thanks sharing this is very informative post..: keep it up
Ai & Artificial Intelligence Course in Chennai
PHP Training in Chennai
Ethical Hacking Course in Chennai Blue Prism Training in Chennai
UiPath Training in Chennai

Anonymous said...

MP Board 12th Class Blueprint 2021 English Medium & Hindi Medium PDF download, MPBSE 12th Blueprint 2021 Pdf Download, mpbse.nic.in 12th Blue Print, Marking Scheme and Arts, Commerce and Science Streams Chapter wise Weightage pdf download. MP Board 12th Blue Print || MPBSE 12th Model Papers || MPBSE 10th Model Papers

Manabadi AP Intermediate 2nd Year Model Question Paper 2021 MPC, BIPC, CEC, MEC group TM, EM Subject wise Blue Print, Download BIEAP Intermediate Second Year Model Question Papers, AP Senior Inter Test Papers, Chapter wise important Questions download. || AP Inter MPC, Bi.PC, CEC Blue Print || AP Inter 1st / 2nd Year Model Papers || AP 2nd year inter Test Papers

Kar 1st / 2nd PUC Blue Print