Ece.Aksu@NDSatcom.com wrote: > I connected two PCs back-to-back via a cross cable on COM2 ports.I > configured serial interfaces using > > # slattach -p slip -s 9600 /dev/ttyS1 > > I assigned IP addresses and added route to the routing table.I configured > everything and I run ping command. > ping results are not what I expected. because delay time is about 390.046 > ms. this is to much. > I want it to be about 1 ms or less. Clearly a 1ms ping (with the default packet size of 64 bytes) is impossible over a 9600bps connection. Assuming 1 start bit and 1 stop bit, the transmission time each way is 64 * 10 / 9600 = 0.067 = 67ms, which gives a minimum round-trip time of 133ms. I don't know why you're getting nearly three times this figure, though. > and is there another way of connecting two PCs via a cross cable > efficiently? If you're concerned about speed, bear in mind that a 9600bps link is 10,000 times slower than 10Mbps ethernet. -- Glynn Clements <glynn.clements@virgin.net> - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org
