[j-nsp] MX BNG with both local server and dhcp relay

[Andrey Kostin]

I didn't have any v6-specific issues with DHCP relay in Junos 21.4. If 
you're going to rely on option-82, consider to turn on proxy mode. 
Without it Junos didn't update Circuit-ID in RENEW packets sent unicast 
from clients to DHCP server. Although it could be fixed in last 
releases, worth to check.

Kind regards,
Andrey

Dave Bell писал(а) 2023-01-13 04:10:
> Thanks Andrey,
> 
> Yes, I believe you are correct. You can't switch from using local DHCP
> server in the global routing table to DHCP relay once authenticated in
> a different VRF.
> 
> I can split my services onto different interfaces coming into the BNG,
> though since you need to decapsulate them first, they end up on the
> same demux interface anyway.
> 
> I analysed a lot of traceoptions and packet captures. My relay didn't
> receive a single packet, and the logs indicated that it was not
> looking for DHCP configuration in my VRF that has forwarding
> configured.
> 
> I think my only option is to move everything over to DHCP forwarding
> in all cases, though this seems quite flaky for v6...
> 
> Regards,
> Dave