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Subnet/dhcp/vlan advice needed please

Tags:
  • DHCP
  • Switch
  • Networking
  • Business Computing
  • Subnet
Last response: in Business Computing
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May 8, 2014 2:56:19 AM

Hi,
just after some advice please re my network please

I'm sysadmin for museum with about 100 day to day users.
I've been here less than a year, so the network has been set up long before I started and it's obviously started very small and my predecessors have just added to it without any thought for future expansion.

Currently everything is running on one single subnet - 192.168.16.0 /24 and a single VLAN.
Servers, clients, VoIP telephony & IP handsets, tills, wifi, etc. So, obviously, the single DHCP range (.15-.150) is cramped.

We have a fibre backbone around the site and new HP switches at all locations.

Network traffic seems to get bogged down at times. I would presume it is because of so much traffic going through the single VLAN, mainly the voip devices.

I want to add some new subnets and assign different systems to each one, in it's own subnet. ie, telephony on one, tills another, public wifi when we implement it (which could be 100s/1000s of users),

Is it just a case of working out new subnet addresses and adding these new scopes to the DHCP server, then re-assigning any manual IPs devices may have? will things still work properly? eg Will I still be able to access the telephony system from the "Windows" vlan, or the Tills from windows vlan, etc.

Hope this makes sense. If anyone could give me some basic guidelines or order of works to follow it would be appreciated.

Thanks,
Graham

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Best solution

May 8, 2014 7:42:06 AM

If you have a fiber backbone & yet you still feel network traffic is getting bogged down, then you likely have a point of congestion that may not necessarily be related to the network setup. It is possible a network resource is getting over-utilized at periods of time, so I would spend some effort to track down the source of the network speed drop-off.

Other than that, you should just be able to expand the scope of your network. 192.168.16.0 /23 or /22 would give you 500-1000 hosts. Add a few more VLANs to further logically segregate traffic, and implement QoS on your switches & servers to prioritize your VoIP traffic.
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