question about bridge and dummynet

[Ji]

Hi all,

I would like to ask if it is impossible to compile "bridge" into
kernel (DFBSD2),
I tried "options BRIDGE" and "device if_bridge", both failed with
error "unknown option/device".

I had to revise "/etc/rc.conf" (cloned_interfaces="bridge0" ...) to
bring bridge to work, and set "net.link.ether.ipfw=1,"
but I found dummynet does not work with bridging traffic. Also, I
could not find variables like "net.link.ether.bridge_ipfw" .
Can anyone help me with that?

Besides, I found another variable "net.inet.ip.dummynet.cpu", what's
its purpose?

Thank you very much.
Ji

Ps.
dn# sysctl -a | grep net
net.local.stream.recvspace: 8192
net.local.stream.sendspace: 8192
net.local.dgram.recvspace: 4096
net.local.dgram.maxdgram: 2048
net.local.inflight: 0
net.inet.ip.portrange.hilast: 65535
net.inet.ip.portrange.hifirst: 49152
net.inet.ip.portrange.last: 5000
net.inet.ip.portrange.first: 1024
net.inet.ip.portrange.lowlast: 600
net.inet.ip.portrange.lowfirst: 1023
net.inet.ip.forwarding: 0
net.inet.ip.redirect: 1
net.inet.ip.ttl: 64
net.inet.ip.rtexpire: 3600
net.inet.ip.rtminexpire: 10
net.inet.ip.rtmaxcache: 128
net.inet.ip.sourceroute: 0
net.inet.ip.accept_sourceroute: 0
net.inet.ip.fastforwarding: 0
net.inet.ip.keepfaith: 0
net.inet.ip.gifttl: 30
net.inet.ip.subnets_are_local: 0
net.inet.ip.dummynet.hz: 1000
net.inet.ip.dummynet.red_max_pkt_size: 1500
net.inet.ip.dummynet.red_avg_pkt_size: 512
net.inet.ip.dummynet.red_lookup_depth: 256
net.inet.ip.dummynet.search_steps: 0
net.inet.ip.dummynet.searches: 0
net.inet.ip.dummynet.extract_heap: 0
net.inet.ip.dummynet.ready_heap: 0
net.inet.ip.dummynet.max_chain_len: 16
net.inet.ip.dummynet.expire: 1
net.inet.ip.dummynet.curr_time: 349673
net.inet.ip.dummynet.hash_size: 64
net.inet.ip.dummynet.cpu: 0
net.inet.ip.ipflow.inuse0: 0
net.inet.ip.ipflow.inuse1: 0
net.inet.ip.fw.dyn_keepalive: 1
net.inet.ip.fw.dyn_short_lifetime: 5
net.inet.ip.fw.dyn_udp_lifetime: 10
net.inet.ip.fw.dyn_rst_lifetime: 1
net.inet.ip.fw.dyn_fin_lifetime: 1
net.inet.ip.fw.dyn_syn_lifetime: 20
net.inet.ip.fw.dyn_ack_lifetime: 300
net.inet.ip.fw.static_count: 1
net.inet.ip.fw.dyn_max: 4096
net.inet.ip.fw.dyn_count: 0
net.inet.ip.fw.curr_dyn_buckets: 256
net.inet.ip.fw.dyn_buckets: 256
net.inet.ip.fw.verbose_limit: 10
net.inet.ip.fw.verbose: 1
net.inet.ip.fw.debug: 1
net.inet.ip.fw.one_pass: 1
net.inet.ip.fw.autoinc_step: 100
net.inet.ip.fw.enable: 1
net.inet.ip.check_interface: 0
net.inet.ip.random_id: 1
net.inet.ip.sendsourcequench: 0
net.inet.ip.maxfragsperpacket: 16
net.inet.ip.maxfragpackets: 208
net.inet.icmp.maskrepl: 0
net.inet.icmp.icmplim: 200
net.inet.icmp.bmcastecho: 0
net.inet.icmp.icmplim_output: 1
net.inet.icmp.log_redirect: 0
net.inet.icmp.drop_redirect: 0
net.inet.tcp.rfc1323: 1
net.inet.tcp.rfc1644: 0
net.inet.tcp.mssdflt: 1460
net.inet.tcp.keepidle: 7200000
net.inet.tcp.keepintvl: 75000
net.inet.tcp.sendspace: 32768
net.inet.tcp.recvspace: 57344
net.inet.tcp.keepinit: 75000
net.inet.tcp.delacktime: 100
net.inet.tcp.v6mssdflt: 1024
net.inet.tcp.reass.overflows: 0
net.inet.tcp.reass.cursegments: 0
net.inet.tcp.reass.maxsegments: 416
net.inet.tcp.smartsack: 1
net.inet.tcp.sack: 1
net.inet.tcp.abc: 1
net.inet.tcp.eifel: 1
net.inet.tcp.rfc3390: 1
net.inet.tcp.aggregate_acks: 1
net.inet.tcp.earlyretransmit: 1
net.inet.tcp.limitedtransmit: 1
net.inet.tcp.delayed_ack: 1
net.inet.tcp.blackhole: 0
net.inet.tcp.log_in_vain: 0
net.inet.tcp.avoid_pure_win_update: 1
net.inet.tcp.path_mtu_discovery: 0
net.inet.tcp.inflight_stab: 20
net.inet.tcp.inflight_max: 1073725440
net.inet.tcp.inflight_min: 6144
net.inet.tcp.inflight_debug: 0
net.inet.tcp.inflight_enable: 0
net.inet.tcp.isn_reseed_interval: 0
net.inet.tcp.icmp_may_rst: 1
net.inet.tcp.pcbcount: 3
net.inet.tcp.do_tcpdrain: 1
net.inet.tcp.tcbhashsize: 512
net.inet.tcp.syncache.rexmtlimit: 3
net.inet.tcp.syncache.hashsize: 512
net.inet.tcp.syncache.cachelimit: 15359
net.inet.tcp.syncache.bucketlimit: 30
net.inet.tcp.syncookies: 1
net.inet.tcp.always_keepalive: 1
net.inet.tcp.rexmit_slop: 200
net.inet.tcp.rexmit_min: 1000
net.inet.tcp.msl: 30000
net.inet.udp.checksum: 1
net.inet.udp.maxdgram: 9216
net.inet.udp.recvspace: 42080
net.inet.udp.strict_mcast_mship: 1
net.inet.udp.blackhole: 0
net.inet.udp.log_in_vain: 0
net.inet.raw.recvspace: 8192
net.inet.raw.maxdgram: 8192
net.inet.accf.unloadable: 0
net.link.generic.system.ifcount: 9
net.link.generic.if_start_oncpu_sched: 0
net.link.generic.if_devstart_schednochk: 0
net.link.generic.if_devstart_schedonly: 0
net.link.generic.ifq_dispatch_schednochk: 0
net.link.generic.ifq_dispatch_schedonly: 0
net.link.ether.inet.log_arp_wrong_iface: 1
net.link.ether.inet.proxyall: 0
net.link.ether.inet.useloopback: 1
net.link.ether.inet.maxtries: 5
net.link.ether.inet.host_down_time: 20
net.link.ether.inet.max_age: 1200
net.link.ether.inet.prune_intvl: 300
net.link.ether.prepend_hdr: 0
net.link.ether.restore_hdr: 0
net.link.ether.ipfw: 0
net.link.bridge.pfil_member: 1
net.link.bridge.pfil_bridge: 1
net.link.bridge.pfil_onlyip: 1
net.link.gif.parallel_tunnels: 0
net.link.gif.max_nesting: 1
net.inet6.ip6.forwarding: 0
net.inet6.ip6.redirect: 1
net.inet6.ip6.hlim: 64
net.inet6.ip6.maxfragpackets: 1664
net.inet6.ip6.accept_rtadv: 0
net.inet6.ip6.keepfaith: 0
net.inet6.ip6.log_interval: 5
net.inet6.ip6.hdrnestlimit: 50
net.inet6.ip6.dad_count: 1
net.inet6.ip6.auto_flowlabel: 1
net.inet6.ip6.defmcasthlim: 1
net.inet6.ip6.gifhlim: 30
net.inet6.ip6.kame_version: 20010528/FreeBSD
net.inet6.ip6.use_deprecated: 1
net.inet6.ip6.rr_prune: 5
net.inet6.ip6.v6only: 1
net.inet6.ip6.rtexpire: 3600
net.inet6.ip6.rtminexpire: 10
net.inet6.ip6.rtmaxcache: 128
net.inet6.ip6.use_tempaddr: 0
net.inet6.ip6.temppltime: 86400
net.inet6.ip6.tempvltime: 604800
net.inet6.ip6.auto_linklocal: 1
net.inet6.icmp6.rediraccept: 1
net.inet6.icmp6.redirtimeout: 600
net.inet6.icmp6.nd6_prune: 1
net.inet6.icmp6.nd6_delay: 5
net.inet6.icmp6.nd6_umaxtries: 3
net.inet6.icmp6.nd6_mmaxtries: 3
net.inet6.icmp6.nd6_useloopback: 1
net.inet6.icmp6.nodeinfo: 3
net.inet6.icmp6.errppslimit: 100
net.inet6.icmp6.nd6_maxnudhint: 0
net.inet6.icmp6.nd6_debug: 0
net.wlan.debug: 0