Re: DHCP for multiple subnets (was: Re: Routing and bandwidth problem)

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On Sun, 13 Jun 2004, Jeff Vian wrote:
> Rodolfo J. Paiz wrote:
> 
> >         1. You *should* configure your dhcpd.conf for every subnet on 
> > which your server has an interface even if the DHCP server does not 
> > assign addresses (i.e. the subnet block does not include a range 
> > statement).
> >
> >         2. The server will then automatically assign an address in the 
> > correct subnet for every incoming request, assuming that it's been 
> > told to assign addresses on that subnet via a range statement. Nothing 
> > more to be done.
> >
> > Too simple. <grin>
> >
> > Cheers,
> 
> Your approach works, and if you have multipl;e hosts on the same subnet 
> being served it may be best, as well as providing the routing for them.  
> 
> You also should consider the technique of assigning IP address based on 
> the MAC address of the requester.  This technique is used to DHCP assign 
> static ip addresses to servers on lots of networks.  There is no need to 
> be tied to one interface per subnet, but rather since the DHCP request 
> broadcast includes the MAC address of the requester (as well as the 
> originating network IP if routed), it can be set in the configuration 
> tables to specify the address to be assigned.

If I recall correctly, (and mind, I haven't seen all of this thread), 
Rodolfo started his quest in another thread.  He was trying to act as a 
quasi-ISP for others in his building, so that they could all share the 
costs of a high-speed internet line.  IIRC, he wanted to be hands-off, 
such that his "clients" could just plug in and deal with their own IT 
issues.  If he had gone with MAC-based DHCP, he'd have become their 
de-facto IT/SA shop.  I don't think that he wants the additional burden. 
:)

Ben



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