How to design and size a proper Wan for an exisitng setup

Hi ,

we have subsidiary company with around 150 Users . it is linked to us (HO ) over IPVPN (1 MB)  and services getted from Us are :

1- CISCO IP telephone ( currently around 75 Users)
2- ERP ( about 50 USers)

thier existign Setup :

1- Domain COntroller ( seprate totally from us ) + Antivirus server ( 1 physical box)
2-finance system
3-Backup Server
4-Sonicwall NSA2600
5-Switches
7-Router for IPVPN

the managment is thinking to host the setup for the subsidary company so my questions are:

1- how I can do the proper sizing for the link ? so i ensure the users are not feeling slowness
2-what equipment should i move from there and what i should not ? best desing fro myour experince
3- how the internet should be provided to thier users ? from us or locally ?
4- what are the adv and disadvanage for such plan? should we recommend this plan or let them continue as they are
5- risks?
6- what are the pre requisits needed in the HO Data Center for hosting those equipment
mu3tasemAsked:
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Blue Street TechLast KnightCommented:
Hi mu3tasem,

1- Domain COntroller ( seprate totally from us ) + Antivirus server ( 1 physical box) - DCs should ONLY be DCs. They should serve dual functions.
2-finance system
3-Backup Server
4-Sonicwall NSA2600
5-Switches
7-Router for IPVPN - not sure why you aren't creating the VPN from the SonicWALL?

1- how I can do the proper sizing for the link ? so i ensure the users are not feeling slowness
1Mbps is going to be way too small, for anything really, let alone VoIP and ERP! Here is a rough table to determine the speeds you'd need to facilitate the users for only VoIP calls (different VoIP providers will differ from this so use this a a general guideline):
Number of Concurrent Calls      /  Minimum Required Bandwidth / Recommended speed
               1                                                 100 Kbps Up and Down                 3 Mbps Up and Down
              3                                                 300 Kbps Up and Down                 3 Mbps Up and Down
              5                                                 500 Kbps Up and Down                 5 Mbps Up and Down
             10                                                 1 Mbps Up and Down                 5-10 Mbps Up and Down
             15                                                 1.5 Mbps Up and Down           10-15 Mbps Up and Down
             20                                                 2 Mbps Up and Down                 15-20 Mbps Up and Down

You will need to run the numbers on all your throughput requirements for VoIP and for ERP to determine how much bandwidth will suffice.
2-what equipment should i move from there and what i should not ? best desing fro myour experince
You could keep everything there. The DC should be federated or otherwise brought in with your other DC so they are communicating. They seem large enough to host all the other items all there.
3- how the internet should be provided to thier users ? from us or locally ?
Locally will be a better service for them (higher bandwidth capabilities), then you both connect through the VPN to share resources.
4- what are the adv and disadvanage for such plan? should we recommend this plan or let them continue as they are
Opposed to what? Are there other plans on the table? See below about risks. There is no redundancy of any kind mentioned. Does your ERP system provide Web Access?
5- risks?
Need to know more about what you are trying to mitigate against. There is no redundancy in this plan of any kind...WAN failover, Firewall HA, DC HA, etc.
6- what are the pre requisits needed in the HO Data Center for hosting those equipment
Can you explain what you mean by the datacenter. You don't provide enough details on how this fits into the plan or what its function is. What equipment exactly?

Let me know!
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ArneLoviusCommented:
To work out the voice you need to know how many concurrent calls they max out at, and multiply that by the call bandwidth.

For the ERP application you will need to investigate what bandwidth it requires, and what effect adding latency has to its performance, you may also investigate using either VDI or RDS/Citrix to provide access to the application.

Depending on the distance between the offices, it may be more cost effective to use a LAN to LAN VPN, or a L2 fibre connection.
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Gary PattersonVP Technology / Senior Consultant Commented:
1.  Complicated.  Bandwidth needs will vary depending on what you move.  You should do some traffic monitoring for each application/server to get an idea of requirements.  

2. Moving servers out of the remote location increases risk of downtime due to connectivity issues.  This is a business decision.  Risk of downtime vs cost savings resulting from moving servers to HO.  Can they do without access to the finance system if the network connection goes down?  For how long?  Is there a backup option for finance system access (vpn, work from home) if there is an extended network outage?  Domain cotroller should stay on site unless moving to cloud AD.  Finance server is business decision:  response time, utilization, network downtime risks.  Backup server depends on backup strategy and where most of the data comes from.  

3. Local nternet is often less expensive, but depends on web monitoring and filtering needs.  Ultimately, it is cost vs security and response time business decision

4. What plan?

5. Availability of services during network downtime, increased response time.

6. Same as with anything: primary power, ups power, generator power, floor space, rack space, switch space, bandwidth, cooling capacity.
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mu3tasemAuthor Commented:
Hi ,

Dear Blue Street Tech ,

1-  It is very difficult to do this exercise especially the time is tight and the company want to finalize the decision ASAP .. My concern that the link is expensive and if we will add backup link it is going to be extra expensive so i cant NOT just increase the bandwidth wihtout a proper study .so i am looking for a quick way to be cloase to specify the bandwidth and be close

2- I agree they are large enough as they are currently hosting all those equipment ..However we have to do the exercise for hosting thier equipment in our data center as per the managment . but I was thinking NOT take all equipemnt in order to reduce the bandwidth needed and convincce the managment .. thats why i asked this question as i was thinkning to distribute thier setup between us and them

3- OK

4- the other plan is to let them stay as they are and NOT move them as it is not goign to be a good plan

5- ok

6- I mean , if we moved all of thier items to our data center , shoudl I isolate theier equipment or I should do some local connectivety  for any kind of enhancment
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mu3tasemAuthor Commented:
Hi Gary ,

1- as i mentioned in my previous comment
2- What About RDC Plan?
3-ok
4-as i mentioned in my previous comment
5-ok
6- ALll what you said is there , but  i mean in terms of isolation or connectivety ..
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