Date: Wed, 13 Oct 2010 17:02:22 +0200 From: Jerome Herman <jherman@dichotomia.fr> To: freebsd-questions@freebsd.org Subject: Is it a good idea to use DHCP for point to point connections ? Message-ID: <4CB5C9FE.90101@dichotomia.fr>
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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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