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limaunion
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Joined: Sun Sep 03, 2017 5:51 pm

Moving from /24 to /23 [SOLVED]

Sat Jul 14, 2018 6:44 am

Hi there! I have an RB750GR3 and was wondering what is the best aproach to move from a /24 to a /23 network in order to have more free IP addresses.

My current DHCP pool is 192.168.88.40-192.168.88.254

Is it just a matter of changing the DHCP pool to something like 192.168.88.40-192.168.89.254 ? and adding the new network under IP > Addresses ? anything else to cosider ?

Thanks!
Last edited by limaunion on Sun Jul 15, 2018 6:06 pm, edited 1 time in total.
 
mkx
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Re: Moving from /24 to /23

Sat Jul 14, 2018 11:32 am

First of all you should change router's IP address from 192.168.88.1/24 to 192.168.88.1/23. Then change DHCP server network address to 192.168.88.0/23. The last thing to change is extending DHCP pool.

If connectivity between LAN machines is a must, wait for at least "lease time" after performing first two steps and before performing last step so that existing DHCP leases expire and everybody receives new network mask. Probably things would work anyway, but lots of intra-LAN traffic would hit router (current DHCP clients would use router to send packets towards new DHCP clients).
BR,
Metod
 
sup5
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Re: Moving from /24 to /23

Sat Jul 14, 2018 5:35 pm

you should probably try to segment your networks in order to increase security and stability.

It is not best practice to host more than 200 clients per broadcast domain.
 
limaunion
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Joined: Sun Sep 03, 2017 5:51 pm

Re: Moving from /24 to /23

Sun Jul 15, 2018 6:04 pm

Thanks for your answers!
I'll investigate this more in detail before doing any change, but at least now I have an idea from where to start.
Best regards

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