1

Given a LAN with default gateway of 10.5.1.1 and subnet of 255.255.0.0

The DHCP range is currently set in the range of 10.5.2.1 to 10.5.3.254

The 10.5.1.x range is reserved for static IP's.

I want to increase the DHCP pool ( the 10.5.2.x - 10.5.3.x range is too small )

Is this DHCP scope limited to the 2.x and 3.x range because of the 255.255.0.0 subnet?

I cannot change the subnet in this scenario. When I try to add another range to the DHCP server ( i.e 10.5.4.x ) it will not allow it ( illegal range? )....

It's a Sonic Wall .. Model: PRO 300 (CPU: StrongARM / 233 Mhz) Firmware version: 6.6.0.6

mozzer
  • 45

4 Answers4

7

The Netmask 255.255.0.0 only defines the first two octets to be your networks fixed address part. So every 10.5.. combination should be fine from the netmask standpoint.

heiko
  • 196
2

Without knowing what DHCP server you're using and exactly how you've configured it, I can't speak to the errors you're getting or what could be causing them, but I can say that there is nothing inherent in the protocol or what you're trying to do that should be a showstopper -- you should be able to assign anything within 10.5.0.0/16 as a DHCP range (assuming nothing not in evidence that would preclude that from happening). I could speculate at length as to what your DHCP server is doing wrong, but it wouldn't be productive.

womble
  • 98,245
1

Why do you have such a large network range, on what appears to be a single subnet?

The more hosts you have on a network the slower it goes even with switches (there is a magic number, but it depends on the type of traffic & amount of traffic).

I would look at segmenting the network into smaller groups such as 10.5.x.0/24 (thus making several private class C's out of your class A). Then put a DHCP server on each subnet, this can be done with a single linux server that can also route the traffic (with-in your org) & hand it off to the sonicwall for internet routing.

tkrabec
  • 300
1

As posted in the comments, SonicWall does routinely limit the number of devices their products will manage. Sometimes they offer "licensing upgrades" as options and sometimes it is a hard limit based upon the particular model.

user48838
  • 7,419