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29 .Nd netmap client to bridge two netmap ports
32 .Bl -tag -width "bridge"
35 .Op Fl b Ar batch size
43 is a simple netmap application that bridges packets between two netmap ports.
44 If the two netmap ports use the same netmap memory region
46 forwards packets without copying the packets payload (zero-copy mode), unless
47 explicitly prevented by the
51 When bridging two physical ports, it is necessary that both NICS are in
52 promiscuous mode, otherwise unicast traffic directed to other hosts will
53 be dropped by the hardware, and bridging will not work.
55 When bridging the hardware rings of a physical port with the corresponding
56 host rings, it is necessary to turn off the offloads, because netmap does
57 not prepare the NIC rings with offload information.
59 .Bd -literal -offset indent
60 ifconfig em0 -rxcsum -txcsum -tso4 -tso6 -lro
66 Name of the netmap port.
67 It can be supplied up to two times to identify the ports that must be bridged.
68 Any netmap port type (physical interface, VALE switch, pipe, monitor port...)
70 If the option is supplied only once, then it must be for a physical interface and, in that case,
72 will bridge the port and the host stack.
73 .It Fl b Ar batch-size
74 Maximum number of packets to send in one operation.
76 indicates the number of seconds to wait before transmitting.
77 It defaults to 2, and may be useful when talking to physical
78 ports to let link negotiation complete before starting transmission.
82 Disable zero-copy mode.
95 at the Universita` di Pisa, Italy.