RFC 4390 from 2006: https://tools.ietf.org/html/rfc4390 (Dynamic Host Configuration Protocol (DHCP) over InfiniBand) also stipulates:
As described above, the link-layer address is unavailable to the DHCP server because the link-layer address is larger than the "chaddr" field length. As a result, the server cannot unicast its reply to the client. Therefore, a DHCP client MUST request that the server send a broadcast reply by setting the BROADCAST flag when IPoIB Address Resolution Protocol (ARP) is not possible, i.e., in situations where the client does not know its IP address. [RFC1542] discourages the use of a broadcast reply. But in the case of IPoIB, this is a necessity because the server does not receive the link-layer address. -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to isc-dhcp in Ubuntu. https://bugs.launchpad.net/bugs/1529815 Title: InfiniBand DHCP flow with PRA and DHCP relay not working Status in isc-dhcp package in Ubuntu: In Progress Bug description: DHCP client is sending discover with Unicast type request for the offer, in this configuration of IB to ETH through a relay we need the type to be broadcast. The issue is that when using dhclient from the client on Ubuntu (and only on Ubuntu) with MOFED or inbox driver, we see that that DHCP server offers in unicast instead of broadcast. It seems there is no way to correct this from the client side using dhclient configuration file. this issue exist even when we use always-broadcast statement in configuration file. in other vendors we see that discover request type is broadcast. attached pcap files from working (other vendor) and not working (Ubuntu) clients. DHCP CLIENT (IPoIB) Ubuntu 14.04 kernel 3.13.0-74 Mellanox OFED 3.1-1.0.3 or inbox driver isc-dhcp-client 4.2.4-7ubuntu12.3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/1529815/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
