Re: DHCP and secondaries

[Richard Letts <[e-mail]>]

William Rippon wrote....
> 
> Hello,
>   If you are talking about having different options for
> clients based on what subnet they connect to, yes you 
> can do this. I believe you can even have specific options
> for a client hwaddr in a specific subnet (or for a class
> of clients). The IBM servers (AIX & OS/2) seem capable of 
> these things.
> 
>   I'm curious to know what services you are limiting as
> you move the machines around?

nothing; it is just that the machine's IP address, subnet-mask and nearest
router will be different on a different subnetwork.

proxy-arp and a subnetmask of 255.255.0.0 for a general calls-B network solves
the subnet problem.

subnet-zero+consistant value solves the nearest router problem
eg {146.87,0,1} is generally a router on the network here
(Yes, this is an arcane aspect of ip, and not widely supported)
hmmm.... from this host I appear to get routed off-campus; 3com routers don't
appear to support this.

host addresses are stil rather tough though.

Richard Letts  
-------------------------------------------------------------------------------
Network Manager                               mail:    [e-mail]  
University of Salford                         phone:     [phone]
Great Britain                                 fax:       [phone]