Net Optics PA-CU-AR - Manual (Page 16)

10/100 Port Aggregator Tap
1
Active Response Tap FAQs (Continued)
Q: How much bandwidth is available on the Active Response Port?
A:.The.average.amount.of.bandwidth.for.active.responses.is.determined.by.
the.average.available.capacity.on.the.link ..For.example,.on.a.100.Mbps.full-
duplex.link,.if.transmission.from.device.A.to.device.B.averages.30.Mbps,.and.
transmission.from.device.B.to.device.A.averages.at.50.Mbps,.then.there.is.an.
average capacity on the first side for 70 Mbps, and on the second side for up
to 50 Mbps of active response traffic.
At.any.particular.point.in.time,.actual.capacity.is.determined.by.the.size.of.the.
packets.being.transmitted.and.the.gap.between.these.packets ..On.a.standard.
link with 64-byte network and active response traffic, the capacity at any point
in.time.will.be.very.close.to.the.average.capacity ..(We.do.not.recommend.
using the Tap on links with jumbo packets as these large – up to 9K – packets
can fill the buffer and impact performance.)
As the most common use for the Tap will be to inject TCP resets, which are
standard.64-byte.packets,.it.is.unlikely.that.the.transmissions.from.either.side.
of.the.Active.Response.Port.will.exceed.10.Mbps,.even.if.many.sessions.are.
terminated.in.a.short.time.frame ..In.our.internal.testing,.we.have.therefore.
focused.on.Active.Response.Port.performance.at.up.to.10.Mbps .
Q: Does Active Response Port require the connected monitoring device to
have an IP address?
A:.Yes,.the.connected.monitoring.device.is.required.to.have.a.MAC.and.IP.
address.when.the.Active.Response.Port.is.operating.in.active.mode ..These.are.
not.required.when.this.Port.is.set.to.passive.mode ..The.Tap.itself.never.has.a.
MAC.or.IP.address,.regardless.of.how.the.Active.Response.Port.is.set .