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shared network

fribe
Techie
Posts: 11
726     0

Hi,

 

A shared network is a network segment to which you assign two or more subnets. You can combine individual contiguous networks into a shared network to allow the DHCP server to assign IP addresses from any subnet (that resides on the same network interface) in the shared network.

 

If I configure it like this, I can see that it always give ip address from the first range. Does the server give ip address either from the two range?

 

 2018-06-14 18_06_25-Infoblox Grid Manager - 8.2.1-359366 (admin).jpg

 

 

Also, without shared network configured, I can see the same behaviour and I think it is by design (without shared network)?

 

THanks

Re: shared network

fribe
Techie
Posts: 11
727     0

I step back. I think my sample is incorrect. It is not leveraging the shared network.

 

 

I configured secondary address in my cisco router


ip address 172.168.32.1 255.255.255.0

ip address 172.168.30.1 255.255.255.0 secondary

 

and once the 1st subnet ran out of address, it switched to the secondary subnet. These two subnets are in the shared network.

 

 

 

 

Re: shared network

Adviser
Posts: 71
727     0

That is correct

Re: shared network

Authority
Posts: 16
727     0

Hi,

 

To quote the Admin Guide:

 

" When you create a shared network, the DHCP server can assign IP addresses to client requests from any subnet (that resides on the same network interface) in the shared network. "

 

Bringing this to context for your example, if you have DHCP networks 172.168.32.0/24 and 172.168.30.0/24 in Shared Network configuration, the server will offer IP addresses from both networks irrespective of the relay IP address.

 

For example:

 

> Shared Networks configured for DHCP on Infoblox:

 

172.168.32.0 255.255.255.0
172.168.30.0 255.255.255.0

 

> IP address of relay agent 172.168.32.100 on incoming DISCOVER packet


> Expected behavior:

 

- The server will OFFER available IP addresses from the 172.168.32.0/24 subnet until exhaustion
- Once the available IP addresses in the 172.168.32.0/24 network are exhausted, the server will continue to OFFER available IP addresses from the 172.168.30.0/24 network - even while the relay IP is 172.168.32.100


If you feel that your Grid behaves differently, I would recommend reaching out to Support who would be more than happy to analyze you configurations.

 

Best regards

Re: shared network

fribe
Techie
Posts: 11
727     0

Thanks Ed. This is noted.

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