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Bad pool size

Posted on 2014-10-15
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Last Modified: 2015-01-01
Hello all. Im trying to set up a router. Rigt now it has a pool size of 128. I want it to be 400+.

Im trying to changing the subnet to 255.255.254.0 when ip is 192.168.1.1 but it wont accept when i tell the pool size to be 510.

Poolsize is set to 510. The ZyWall 30 wont accept that and goes back to 128.

When i click apply, it will go back to 128. What am i missing?
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Question by:Mike Kristensen
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by:Don Johnston
ID: 40383022
You don't indicate what brand/model device so there's no way to know for sure. But there are two possibilities:

1) This device does not allow for super-netting. So change the IP address to a non-class C address. Try 172.16.0.0 with a /23 mask.

2) The device does not allow for a mask shorter than 24-bits.
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by:Mike Kristensen
ID: 40384022
oki. Its a ZyXel ZyWall 35.

Is there any specific thing i neda look for when trying to figure out the above you tell me?
I managed to get the pool to 253 when using subnet 255.255.252.0 but i aint really 100% sure how it works. Also because i might not understand it, due to a hidden limitation which i dont know of.
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by:Don Johnston
Don Johnston earned 500 total points
ID: 40384078
I managed to get the pool to 253 when using subnet 255.255.252.0
You mean a pool size of 253?  If you have a mask of 255.255.252.0, then you have a pool of 1022 addresses.

For the sake of consistency, if you're going to be using a mask shorter than /24 (255.255.255.0), then you should be using an address of 192.168.0.0.  It will work with 192.168.1.0, but things could get confusing. And like I said before, a 172.16.0.0 address would be even better. This is especially true since it appears you're running RIP.
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by:Mike Kristensen
ID: 40391418
Am i running RIP? What is that?

Why 172.16.0.0? And why 192.168.0.1 over 192.168.1.1? Im so lost. Normally i was running a server with range 192.168.1.1 - 192.168.3.254 was this bad?

The Zywall 35 wont let me increase the poolsize over 253, so i believe it might be a limitation from its perspective. I will read up on this in the Zywall datasheets.
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Don Johnston earned 500 total points
ID: 40392084
Oh my... ;-)

RIP is a routing protocol. It's used to distribute the list of networks to other routers.

Because RIP is a classfull routing protocol, it expects a certain mask.  Because 192.x.x.x addresses default to a 255.255.255.0 mask (which you can make longer but run into problems making it shorter), that may be part of the problem.  Since a 172.x.x.x address has a default mask of 255.255.0.0,  using that address may solve the issue.

But it sounds like this is way beyond your knowledge level.  It may be prudent to bring in a network consultant to help.
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