More than 256 devices on network (RV082/RV016)

Discussion in 'Cisco Small Business Routers and VPN Solutions' started by klubar, Dec 17, 2007.

  1. klubar

    klubar LI Guru Member

    I'm running a small business network and we're getting close to more than 256 IP devices on the LAN (roughly 50 fixed IP addresses--printers, servers, etc.) and 120 PC and 120 IP phones. Currently we have a RV016 handling DHCP and gigabit/fast ethernet switches tying everything together. What do I need to go over 256 addresses on my network? It looks like the DHCP on RV016 will only handle 256 addresses and can't handle more than a class C (256) addresses for routing? If I throw in another router, I need something that can route at gigabit speeds to reach our servers. What's the recommendation for my network?

  2. Toxic

    Toxic Administrator Staff Member

    I take it you have some sort of server running in your infastructure? why not get this to handle DHCP and assign different ranges of IPs to different departments/hardware I would hate to see the amount of bandwidth wasted with broadcasts on so many users in the same ip range

    you also only have 253 IPs on a Class C Subnet. .0 being the network address and 255 being the broadcast address.

    you could also try changing the subnet mask from to

    this will give you 65536 IPs ranging from through to

    I dont know if the RV016 is bound by Class C Subnet mask though or how many the device can handle.

  3. klubar

    klubar LI Guru Member

    More than 256 devices; multiple subnets

    Thanks for the suggestion. The RV016 (unlike the RV082) can handle multiple subnet settings. From the help: "Multiple Subnet Setting: This feature allows users to take the existing address allocation and split it up into multiple networks. Click Add/Edit to add new subnets by entering LAN IP Address and Subnet Mask and then clicking Add to list."

    I assume that with multiple subnets the RV016 acts like a router between the subnets.

    And yes, you're right about needing a seperate DHCP server on the network; I can add that service to one of our servers without any problems; and yes, there are ony 253 (actuallly 252 when you lose the router) addresses on the network.

    We've not yet hit 225 addresses so I'll postpone this move to seperate subnets until we get closer.

    Any guess how much traffic I'm generating on broadcasts?

  4. Toxic

    Toxic Administrator Staff Member

    If possible try setting up VLANs to lower the amount of traffic over your whole infrastructure.
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