DHCP Relay + PPP (your mail)

Simon Hobson dhcp at thehobsons.co.uk
Tue May 23 22:34:46 UTC 2006

Thinking more about this, things are even simpler that I first 
thought - unless you know differently that is !

The relay agent has only one function, to receive broadcast packets 
from clients which are forwarded to the dhcp server, and to broadcast 
the returned packets. To deal with the broadcast packets requires 
jumping through the hoops it does.

However, handling the packets from the dhcp server is surely a 
trivial exercise - all that is required is to open the right port (67 
or 68 ?) on any IP address(es) that the relay agent might use for the 
GIAddr. The actual interface doesn't matter and probably isn't the 
real interface that the packet arrives on from the server - you just 
need to be able to receive a unicast packet to the GIAddr.

If done that way, then there would be no need to worry about the 
technology of any upstream connections - only that of the client 
networks. Also, the only configuration required would be the 
network(s) to listen on for client broadcasts (and server 
address(es)) - certainly no need to worry about how server reply 
packets will arrive.

Have I missed something blindingly obvious ?


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