DHCP Question

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Hi All

It's been a long time since I frequented this place, good to see it is still going strong.

I have a question relating to DHCP, will a DHCP server only respond to DHCP requests for the domain that it is a member of.

EG: 2 domains on the same subnet (domain 1 and domain 2), each domain has there own DHCP server/s, will requests from clients in domain 1 get a response from a dhcp server in domain 2 or will requests be domain specific?

Cheers

Nelix

 

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Think about it another way, if the PC isn't a member of the domain - will it get an IP address from a DHCP server? yes. The DHCP server will broadcast on the whole subnet regardless of what domain.

Therefore having two DHCP servers could cause issues with both assigning duplicate IPs.

 

So just for my own clarification, what's the best way to set up 2 sub domains so they use different DHCP scopes (or subnets) whilst being able to communicate?

 

You would want to configure MAC filtering.

 

In real life, you wouldn't set it up like this.

 

That was my thought, same with the original post... unless you need to keep them separate for a reason (sensitive data etc)

Bookmarked! Never know when that may come in handy, looks a bit fiddly though!

 

I suppose this is considered a necro, but... are you wanting two different networks to ride the same wires? Also, when you say communicate, you don't mean with each other I presume? I've never really messed with vlans, but I guess you could separate the subnets in your switch. You could also support both of the subnets with one dhcp server if you wanted.

 

A DHCP server will respond to ANY incoming request unless it is specifically told not to do so ("deny booting", in isc-dhcp-server for example).

Your best best is the obvious, if these are separate domains, why are they not separated with a router? When you break the broadcast domain, you separate DHCP.