DHCP relay - process replies (DHCP-Offer, DHCP-Ack...)

[Chaigneau, Nicolas]

> > But in the virtual server configuration, the giaddr is supposed to be changed:
> > 
> > 		update request {
> > 			# IP Address of the DHCP relay (ourselves)
> > 			&DHCP-Gateway-IP-Address := 10.11.19.12
> > 		}
> 
>   That should work...  the code path isn't complicated.
> 
> > This doesn't work, however. The network capture shows that giaddr was not changed in the relayed packet.
> > I thought maybe it's because "request" is the initial packet received, so I need to update the "proxy request".
> 
>   No, the DHCP relay forwards the original request.  It's all a bit backwards.
> 
> > What is the correct way to have FreeRADIUS behave as a DHCP relay ?
> 
>   It should work.  What does the debug output show?
> 


Here goes.


Thu Oct 12 16:08:18 2017 : Debug: (1) Received code 1025 Id 1 from 10.11.19.3:67 to 10.11.19.12:67 length 300
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Opcode = Client-Message
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Hardware-Type = Ethernet
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Hardware-Address-Length = 6
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Hop-Count = 1
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Transaction-Id = 1
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Number-of-Seconds = 0
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Flags = 0
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Client-IP-Address = 0.0.0.0
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Your-IP-Address = 0.0.0.0
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Server-IP-Address = 0.0.0.0
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Gateway-IP-Address = 10.11.19.3
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Client-Hardware-Address = 44:48:42:00:01:01
Thu Oct 12 16:08:18 2017 : Debug: (1)   DHCP-Message-Type = DHCP-Discover
Thu Oct 12 16:08:18 2017 : Debug: Trying sub-section dhcp DHCP-Discover {...}
Thu Oct 12 16:08:18 2017 : Debug: (1)   dhcp DHCP-Discover {
Thu Oct 12 16:08:18 2017 : Debug: (1)     update config {
Thu Oct 12 16:08:18 2017 : Debug: (1)       &DHCP-Relay-To-IP-Address := 10.11.19.28
Thu Oct 12 16:08:18 2017 : Debug: (1)     } # update config = noop
Thu Oct 12 16:08:18 2017 : Debug: (1)     update request {
Thu Oct 12 16:08:18 2017 : Debug: (1)       &DHCP-Gateway-IP-Address := 10.11.19.12
Thu Oct 12 16:08:18 2017 : Debug: (1)       Overwriting value "10.11.19.3" with "10.11.19.12"
Thu Oct 12 16:08:18 2017 : Debug: (1)     } # update request = noop
Thu Oct 12 16:08:18 2017 : Debug: (1)     modsingle[post-auth]: calling ok (rlm_always)
Thu Oct 12 16:08:18 2017 : Debug: (1)     modsingle[post-auth]: returned from ok (rlm_always)
Thu Oct 12 16:08:18 2017 : Debug: (1)     [ok] = ok
Thu Oct 12 16:08:18 2017 : Debug: (1)   } # dhcp DHCP-Discover = ok
Sending DHCP-Discover Id 00000001 from 10.11.19.12:67 to 10.11.19.28:67
Thu Oct 12 16:08:18 2017 : Debug: (1) Not sending reply to client.
Thu Oct 12 16:08:18 2017 : Debug: (1) Finished request
Thu Oct 12 16:08:18 2017 : Debug: (1) Cleaning up request packet ID 1 with timestamp +24
Thu Oct 12 16:08:18 2017 : Info: Ready to process requests






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