.TH VV 4 "27 July 1983" .UC 4 .SH NAME vv \- Proteon proNET 10 Megabit ring .SH SYNOPSIS .B "device vv0 at uba0 csr 161000 vector vvrint vvxint" .SH DESCRIPTION The .I vv interface provides access to a 10 Mb/s Proteon proNET ring network. .PP The network number to which the interface is attached must be specified with an SIOCSIFADDR ioctl before data can be transmitted or received. The host's address is discovered by putting the interface in digital loopback mode (not joining the ring) and sending a broadcast packet from which the source address is extracted. the Internet address of the interface would be 128.3.0.24. .PP The interface software implements error-rate limiting on the input side. This provides a defense against situations where other hosts or interface hardware failures cause a machine to be inundated with garbage packets. The scheme involves an exponential backoff where the input side of the interface is disabled for longer and longer periods. In the limiting case, the interface is turned on every two minutes or so to see if operation can resume. .PP If the installation is running CTL boards which use the old broadcast address of 0 instead of the new address of 0xff, the define OLD_BROADCAST should be specified in the driver. .PP If the installation has a Wirecenter, the define WIRECENTER should be specified in the driver. .BR N.B. : Incorrect definition of WIRECENTER can cause hardware damage. .PP The interface normally tries to use a ``trailer'' encapsulation to minimize copying data on input and output. This may be disabled, on a per-interface basis, by setting the IFF_NOTRAILERS flag with an SIOCSIFFLAGS ioctl. .SH DIAGNOSTICS .PP \fBvv%d: host %d\fP. The software announces the host address discovered during autoconfiguration. .PP \fBvv%d: can't initialize\fP. The software was unable to discover the address of this interface, so it deemed "dead" will not be enabled. .PP \fBvv%d: error vvocsr=%b\fP. The hardware indicated an error on the previous transmission. .PP \fBvv%d: output timeout\fP. The token timer has fired and the token will be recreated. .PP \fBvv%d: error vvicsr=%b\fP. The hardware indicated an error in reading a packet off the ring. .PP \fBen%d: can't handle af%d\fP. The interface was handed a message with addresses formatted in an unsuitable address family; the packet was dropped. .PP \fBvv%d: vs_olen=%d\fP. The ring output routine has been handed a message with a preposterous length. This results in an immediate .IR "panic: vs_olen" . .SH SEE ALSO intro(4N), inet(4F)