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IP Reservation

Techie
Posts: 1
115     0

Hello. Does a host record also double as an IP reservation? For example, if I've got a range of .10 to .200, but I create a host record at .25 for a device that is statically configured, will it be excluded from the DHCP pool for future lease attempts? I always thought it will, but I can't seem to find the answer in writing on the web or the admin guide.

 

 

 

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Re: IP Reservation

[ Edited ]
Expert
Posts: 260
116     0

Short answer is "no".

 

If you create a host entry in the middle of a DHCP range, Infoblox does not do anything to exclude that entry from the DHCP range. I don't know why they don't add it as an exclusion, it would be quite easy - if you don't want to the DHCP server to offer this IP address then you'll need to add the exclusion manually onto the range.

 

This is what I get in the config if I create a range from .10 to .200 then assign .25 as a host entry, there is no mention of .25 nor splitting of the scope... maybe you should log a feature request?

 

subnet 10.1.1.0 netmask 255.255.255.0 {
	pool {
		infoblox-range 10.1.1.10 10.1.1.200;
		range 10.1.1.10 10.1.1.200;
	}
}

 

If I add the exclusion for .25 I get this (it splits the range around my host entry...):

 

subnet 10.1.1.0 netmask 255.255.255.0 {
	pool {
		infoblox-range 10.1.1.10 10.1.1.200;
		range 10.1.1.10 10.1.1.24;
		range 10.1.1.26 10.1.1.200;
	}
}

 

Paul Roberts
PCN (UK) Ltd

All opinions expressed are my own and not representative of PCN Inc./PCN (UK) Ltd. E&OE
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