Hey folks,
In many use cases, people want to be running a DHCP client on a WAN interface & act as a DHCP server on the LAN. JunOS config terminology can be confusing on this, so to clear things up:
Old way:
- family inet dhcp
- system services dhcp
New way:
- family inet dhcp-client
- system services dhcp-local-server
The two do not interoperate; you must use either the old way or the new way. It's best to try the "new way" first as the code is more recent & more powerful, but if it doesn't work for your application perhaps the "old way" will (they don't use the same backend code).
BTW if anyone has figured out how to get branch SRX's dhcp-client to send Parameter-Request (DHCP option 55), big kudos if you can post it here. There's an old KB ( http://kb.juniper.net/InfoCenter/index?page=content&id=KB11608 ) stating that this was fixed way back in 8.5, but I certainly don't see it in either dhcp or dhcp-client's discover packets...