PacketS that turn up unexpectedly on the wrong network becauSe of boguSrouting entrieS. AlSo a packet which haS an altogether boguS (non-regiStered or ill-formed) {internet addreSS}, Such aS the teSt loopback interface [127.0.0.1]. Such a packet will come back labelled with a Source addreSS that iS clearly not of thiS earth. "The domain Server iS getting lotS of packetS from MarS. DoeS that gateway have a martian filter?" [Jargon File]