On 2014-07-18 at 15:09:55 +0200, 'peter' via netsniff-ng <[email protected]> wrote: > hi, > > > im looking for a way to automate packet generation for traffic > shaper testing. > found a testfile online and modified it a bit, only > source/destination ip are valid for the interface ...the rest is > from the sourcefile so there are wrong mac addresses and so on. > for traffic shaping testing (HFSC) i only need a mix of small / big > packets that i can capture and graph. > its udp, its 322bytes long (according to trafgen output). > > > when i run: > trafgen --cpp --dev wlan0 --conf packets/322bytes -t 10ms -n 10 > > and: > tcpdump -i wlan0 port 7777 > > > it shows 10 packets, each about 10ms apart from another but it takes > some seconds before the packets show up in tcpdump...why is that?
Any specific reason you're using tcpdump instead of netsniff-ng? ;-) > running the same command with "-n 100" i get: > 31 packets captured > 100 packets received by filter > 69 packets dropped by kernel > > when aborting tcpdump with ctrl+c. > why would the linux kernel drop packets? since they are 10ms apart > and 322bytes long it should manage? > it not like i send 1000 packets without time between sends or am i > hitting some limitation? What does the trafgen config file look like? What kernel version are you using? What driver for wlan0? What version of netsniff-ng/trafgen/tcpdump? Without this information it's gonna be rather difficult to pinpoint the problem... Cheers Tobias -- You received this message because you are subscribed to the Google Groups "netsniff-ng" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
