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