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[OpenStack Infra <1599473@xxxxxxxxxxxxxxxxxx>]

Reviewed:  https://review.openstack.org/338252
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=b6592c7372db39884a2282f048b6a29ef9fc2783
Submitter: Jenkins
Branch:    master

commit b6592c7372db39884a2282f048b6a29ef9fc2783
Author: Edan David <edand@xxxxxxxxxxxx>
Date:   Wed Jul 6 09:17:48 2016 -0400

    Add dhcp to Fdb extension's permitted device owners
    
    Change-Id: I8c15f340b82424de44f5477ce36b67efe76dee59
    Closes-Bug: #1599473


** Changed in: neutron
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1599473

Title:
  guest with direct port send broadcast request on dhcp renew in case
  guest and dhcp on the same physical node

Status in neutron:
  Fix Released

Bug description:
  In case guest with direct port is located at the same host as network node,
  the dhcp renewal is sent in broadcast instead of unicast causing unnecessary noise.
  The reason is that after the expiration of the lease the guest send a renew message to the dhcp server, the PF then directs this message to the wire instead, because the FDB table is not yet updated for outgoing messages to the dhcp server (all previous messages sent were broadcast).

  the following is the tcpdump of the renew lease:

  14:24:04.289620 ARP, Ethernet (len 6), IPv4 (len 4), Request who-has 10.0.0.3 (ff:ff:ff:ff:ff:ff) tell 0.0.0.0, length 42
  14:24:04.931965 IP (tos 0x10, ttl 128, id 0, offset 0, flags [none], proto UDP (17), length 328)
      10.0.0.3.68 > 255.255.255.255.67: [udp sum ok] BOOTP/DHCP, Request from fa:16:3e:9b:58:71, length 300, xid 0x2fb24d63, secs 49, Flags [none] (0x0000)
     Client-IP 10.0.0.3
     Client-Ethernet-Address fa:16:3e:9b:58:71
     Vendor-rfc1048 Extensions
       Magic Cookie 0x63825363
       DHCP-Message Option 53, length 1: Request
       Hostname Option 12, length 9: "localhost"
       Parameter-Request Option 55, length 13:
         Subnet-Mask, BR, Time-Zone, Classless-Static-Route
         Domain-Name, Domain-Name-Server, Hostname, YD
         YS, NTP, MTU, Option 119
         Default-Gateway
  14:24:04.932330 IP (tos 0xc0, ttl 64, id 19713, offset 0, flags [none], proto UDP (17), length 371)
      10.0.0.2.67 > 10.0.0.3.68: [udp sum ok] BOOTP/DHCP, Reply, length 343, xid 0x2fb24d63, secs 49, Flags [none] (0x0000)
     Client-IP 10.0.0.3
     Your-IP 10.0.0.3
     Server-IP 10.0.0.2
     Client-Ethernet-Address fa:16:3e:9b:58:71
     Vendor-rfc1048 Extensions
       Magic Cookie 0x63825363
       DHCP-Message Option 53, length 1: ACK
       Server-ID Option 54, length 4: 10.0.0.2
       Lease-Time Option 51, length 4: 120
       RN Option 58, length 4: 56
       RB Option 59, length 4: 101
       Subnet-Mask Option 1, length 4: 255.255.255.0
       BR Option 28, length 4: 10.0.0.255
       Domain-Name-Server Option 6, length 4: 10.0.0.2
       Domain-Name Option 15, length 14: "openstacklocal"
       Hostname Option 12, length 13: "host-10-0-0-3"
       Default-Gateway Option 3, length 4: 10.0.0.1
       Classless-Static-Route Option 121, length 14: (169.254.169.254/32:10.0.0.1),(default:10.0.0.1)
       MTU Option 26, length 2: 1500

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