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RFC 2131: Section 4.1 of the DHCP RFC 2131 states: DHCP uses UDP as...

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Comment by torkar
Submitted on 1/19/2005
Related RFC: RFC 2131
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Section 4.1 of the DHCP RFC 2131 states: DHCP uses UDP as its transport protocol. DHCP messages from a client to a server are sent to the 'DHCP server' port (67), and DHCP messages from a server to a client are sent to the 'DHCP client' port (68).It is clear by now that this is implemented fairly differently looking at certain dhcp software (bootp disallows acceptance from other ports than 68, while ISC DHCP doesn't care).Is there a reason for _not_ allowing a dhcp offer from other ports than the one above (68)?1. If I take a laptop and connect it to the network I can then easily set up a dhcp server (since I'm root on my own laptop). One way to stop this is to make sure to not let other network cards connect to the network by e.g. restricting the MAC addresses allowed.2. If there is such a restriction then anyone with an account on a workstation, can set up a dhcp server on port >1024.So is the restriction there to disallow acceptance from ports >1024? Is this a recommendation or is it _exactly_ how it should be implemented (i.e. not allowing from other ports than 68)?Best,/Richard Torkarrichard.torkar@htu.se

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