Is it a good idea to use DHCP for point to point connections ?

[Elliot Finley]

we did this with DSL customers.  But instead of using a unique gateway for
each Client, just use IP Unnumbered and proxy arp for your loopback
interface.

On Wed, Oct 13, 2010 at 9:02 AM, Jerome Herman <jherman at dichotomia.fr>wrote:

> Hello,
>
> Given the price (an tedious management) of layer 3 switches I was thinking
> about using modified DHCP to distribute addresses with a /32 netmask
> (255.255.255.255)
>
> The Idea : Create a cheap (and preferably not dirty) way to have client
> isolation, without creating tons of vlan.
>
> Pratictal overview : The DHCP server will be serving IP addresses and
> gateways with a /32 mask.
> Client1 would recieve IP adress of 241.0.0.1 with a netmask of
> 255.255.255.255 and a gateway of 240.0.0.1
> Client2 would recieve IP adress of 241.0.0.2 with a netmask of
> 255.255.255.255 and a gateway of 240.0.0.2
> Client3 would recieve IP adress of 241.0.0.3 with a netmask of
> 255.255.255.255 and a gateway of 240.0.0.3
> etc.
>
> Of course the gateway will have to have as many IP as there are clients
> (Unless I am mistaken)
>
> The questions :
> - Is there something similar already existing ? It must not require any
> configuration on the client side other than activating DHCP.
> - Would this work ? I do not see why it would not, though I am a little
> anxious about having tens of point to point connections going to the same
> physical port.
> - I could not find anything forbidding it in RFC2131, but then again I
> might be wrong. Am I ?
> - One problem remains that is solved by vlan isolation but not by DHCP
> isolation : rogue DHCP servers. Any Idea to crush those ?
>
> I hope it is not inappropriate to post this on this list. But it is an
> interesting problem (I think).
>
> Jerome Herman
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