Full request and parameters list, when creating a new host, edit the existing interface and select Bond from the menu:

2016-11-03T15:44:28 c50b235a [app] [I] Started GET "/interfaces/new?host%5Binterfaces_attributes%5D%5B0%5D%5B_destroy%5D=0&host%5Binterfaces_attributes%5D%5B0%5D%5Btype%5D=Nic%3A%3ABond&host%5Binterfaces_attributes%5D%5B0%5D%5Bmac%5D=&host%5Binterfaces_attributes%5D%5B0%5D%5Bidentifier%5D=&host%5Binterfaces_attributes%5D%5B0%5D%5Bname%5D=loren-ditmars&host%5Binterfaces_attributes%5D%5B0%5D%5Bdomain_id%5D=&host%5Binterfaces_attributes%5D%5B0%5D%5Bsubnet_id%5D=&host%5Binterfaces_attributes%5D%5B0%5D%5Bsubnet6_id%5D=&host%5Binterfaces_attributes%5D%5B0%5D%5Bip%5D=&host%5Binterfaces_attributes%5D%5B0%5D%5Bip6%5D=&host%5Binterfaces_attributes%5D%5B0%5D%5Bmanaged%5D=0&host%5Binterfaces_attributes%5D%5B0%5D%5Bmanaged%5D=1&host%5Binterfaces_attributes%5D%5B0%5D%5Bprimary%5D=0&host%5Binterfaces_attributes%5D%5B0%5D%5Bprimary%5D=1&host%5Binterfaces_attributes%5D%5B0%5D%5Bprovision%5D=0&host%5Binterfaces_attributes%5D%5B0%5D%5Bprovision%5D=1&host%5Binterfaces_attributes%5D%5B0%5D%5Bvirtual%5D=0&host%5Binterfaces_attributes%5D%5B0%5D%5Btag%5D=&host%5Binterfaces_attributes%5D%5B0%5D%5Battached_to%5D=&host%5Bcompute_resource_id%5D=&_=1478187861319" for 127.0.0.1 at 2016-11-03 15:44:28 +0000
2016-11-03T15:44:28 c50b235a [app] [I] Processing by InterfacesController#new as JS
2016-11-03T15:44:28 c50b235a [app] [I]   Parameters: {"host"=>{"interfaces_attributes"=>{"0"=>{"_destroy"=>"0", "type"=>"Nic::Bond", "mac"=>"", "identifier"=>"", "name"=>"loren-ditmars", "domain_id"=>"", "subnet_id"=>"", "subnet6_id"=>"", "ip"=>"", "ip6"=>"", "managed"=>"1", "primary"=>"1", "provision"=>"1", "virtual"=>"0", "tag"=>"", "attached_to"=>""}}, "compute_resource_id"=>""}, "_"=>"1478187861319"}
2016-11-03T15:44:28 c50b235a [sql] [D]   ActiveRecord::SessionStore::Session Load (0.2ms)  SELECT  "sessions".* FROM "sessions" WHERE "sessions"."session_id" = ?  ORDER BY "sessions"."id" ASC LIMIT 1  [["session_id", "c50b235a48cb1e68cb9f3ecdf05f0a1e"]]
2016-11-03T15:44:28 c50b235a [sql] [D]   User Load (0.1ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1  [["id", 24]]
2016-11-03T15:44:28 c50b235a [app] [D] Setting current user thread-local variable to admin
2016-11-03T15:44:28 c50b235a [sql] [D]   AuthSource Load (0.1ms)  SELECT  "auth_sources".* FROM "auth_sources" WHERE "auth_sources"."id" = ? LIMIT 1  [["id", 1]]
2016-11-03T15:44:28 c50b235a [app] [I] Completed 500 Internal Server Error in 9ms (ActiveRecord: 0.4ms)
2016-11-03T15:44:28 c50b235a [app] [F] 
 | ActiveModel::ForbiddenAttributesError (ActiveModel::ForbiddenAttributesError):
 |   app/models/host/base.rb:76:in `initialize'
 |   app/models/host/managed.rb:48:in `initialize'
 |   app/models/concerns/foreman/sti.rb:22:in `new_with_cast'
 |   app/models/host.rb:15:in `method_missing'
 |   app/controllers/interfaces_controller.rb:8:in `new'
 |   app/controllers/concerns/application_shared.rb:14:in `set_timezone'
 |   app/models/concerns/foreman/thread_session.rb:32:in `clear_thread'
 |   lib/middleware/catch_json_parse_errors.rb:8:in `call'
 |   lib/middleware/tagged_logging.rb:18:in `call'
 | 
 | 
2016-11-03T15:44:28 c50b235a [app] [I]   Rendered /home/dcleal/.rvm/gems/ruby-2.3.0@foreman/gems/actionpack-4.2.7.1/lib/action_dispatch/middleware/templates/rescues/_source.erb (2.4ms)

It appears that the InterfacesController doesn't use strong params.

Applied in changeset 93046b80ad54cfaecf37d14f701dda8613265b1a.

Here is a screenshot of the bond form coming in through discovery.

https://www.dropbox.com/s/cwb0cra28b4dwck/Screenshot%202016-11-07%2014.10.47.png?dl=0