pcattcp -h

PCAUSA Test TCP Utility V2.01.01.13 (IPv4/IPv6)

Usage: pcattcp -t [-4|-6] [-options] host [ < in ]

pcattcp -r [-4|-6] [-options > out]

Common options:

-4 use IPv4 (default)

-6 use IPv6

-l ## length of bufs read from or written to network (default 8192)

-u use UDP instead of TCP

-p ## port number to send to or listen at (default 5001)

Can specify multiple sequential ports two ways:

-p #first-#last

-p #first+#additional

-s toggle sinkmode (enabled by default)

sinkmode enabled:

-t: source (transmit) fabricated pattern

-r: sink (discard) all received data

sinkmode disabled:

-t: reads data to be transmitted from stdin

-r: writes received data to stdout

-A align the start of buffers to this modulus (default 16384)

-O start buffers at this offset from the modulus (default 0)

-v verbose: print more statistics

-d set SO_DEBUG socket option

-b ## set socket buffer size (if supported)

-f X format for rate: k,K = kilo{bit,byte}; m,M = mega; g,G = giga

-c -t: send continuously

-r: accept multiple connections sequentially

-a bind to local host interface IP address

Options specific to -t:

-n ## number of source bufs written to network (default 2048)

-D don't buffer TCP writes (sets TCP_NODELAY socket option)

-w ## milliseconds of delay before each write (default 0)

-R ## desired transmit data rate in bytes/second

Options specific to -r:

-M concurrent TCP/UDP multithreaded receiver

-B for -s, only output full blocks as specified by -l (for TAR)

-T "touch": access each byte as it's read