Ηλια Χατζηστυλη wrote:
Hello, I have an openwrt firmware installed in my router and I want to configure a Home and a Guest interface. So I have two internal interfaces(home,guest) and the external(eth1). First I have to send all traffic from the two internal interfaces(wlan0,wlan0-1) to external(eth1). With my project I have to measure latency so I use nping. However when I use the command "sudo nping -c 3200 --data-length 1460 x.x.x.x" with network seted to upload bandiwidth 2Mbps and with data length 1460 B (1460*8=11740) we expect minimum delay 11740/2000000=5.8ms . Nonetheless, the avg ping time is about 0.8-3 ms which means that my iptables commands doesn't work properly for the ping traffic (icmp type). Do you know how I can route this traffic with the tcp one? I'm pretty sure that icmp traffic is enqueued because when the home user is uploading a file nping command takes out the proper delay.
Easier to look at iptables counters to see what's hitting rules. You don't say how you limit to 2mbit. Linux QOS doesn't emulate bitrate latency so your test is not valid for seeing where packets go. netem rate option does try to limit according to packet size subject to timer granularity (see man tc-netem). FWIW your calculation for rth should probably be more like (1460+8+20+14)*8. -- To unsubscribe from this list: send the line "unsubscribe lartc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
