DHCP "static" assignments

Chris Buxton clists at buxtonfamily.us
Thu Aug 8 19:26:41 UTC 2013

On Aug 8, 2013, at 9:21 AM, Sten Carlsen <stenc at s-carlsen.dk> wrote:

> It seems to me that the man-page is not quite in agreement with this:
> ~~~~
> The host declarations will only match a client if one of their fixed-address statements is viable on the subnet (or shared network) where the client is attached. Conversely, for a host declaration to match a client being allocated a dynamic address, it must not have any fixed-address statements. 
> ~~~~
> This text says "not have any fixed-address statements", it does not say any fixed addresses in this subnet.
> I also find the following a bit confusing:
> ~~~~
> The fixed-address declaration is used to assign one or more fixed IP addresses to a client. It should only appear in a host declaration. If more than one address is supplied, then when the client boots, it will be assigned the address that corresponds to the network on which it is booting. If none of the addresses in the fixed-address statement are valid for the network to which the client is connected, that client will not match the host declaration containing that fixed-address declaration. Each address in the fixed-address declaration should be either an IP address or a domain name that resolves to one or more IP addresses. 
> ~~~~
> What does it mean "will not match"? Does that mean that the client is then an "unknown client"?

These are both good questions.

In my experience, one should never assume that the DHCP man pages are 100% accurate. They are not.

Chris Buxton
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