Hi, my wan connection is 7000kbit down and 800kbit up. If i setup a download and upload at the same time, speed drops to 60KB/s down and 70KB/s up. This is an expected behavior without any shaping. As i only wanted to give my PBX (192.168.0.101) a fixed bandwidth for sip, i came up with the following: tc qdisc add dev pppoe-wan root handle 1: htb default 30 tc class add dev pppoe-wan parent 1: classid 1:1 htb rate 800kbit tc class add dev pppoe-wan parent 1:1 classid 1:10 htb rate 120kbit # voip tc class add dev pppoe-wan parent 1:1 classid 1:30 htb rate 680kbit # default iptables -t mangle -A FORWARD -s 192.168.0.101 -j CLASSIFY --set-class 1:10 It does what i want, reserves 120kbit for traffic from 192.168.0.101. However the nice side effect is, that this also boosts my download/uploads and i have no idea why. Download is at 650KB/s and upload is around 65KB/s. Can anyone explain this behavior? Thank you in advance. Stefan root@OpenWrt:~# tc -s class show dev pppoe-wan class htb 1:10 parent 1:1 prio 0 rate 120000bit ceil 120000bit burst 1599b cburst 1599b Sent 140214 bytes 295 pkt (dropped 486, overlimits 0 requeues 0) rate 7584bit 2pps backlog 0b 0p requeues 0 lended: 295 borrowed: 0 giants: 0 tokens: -583208 ctokens: -583208 class htb 1:1 root rate 800000bit ceil 800000bit burst 1600b cburst 1600b Sent 12418167 bytes 25721 pkt (dropped 0, overlimits 0 requeues 0) rate 535272bit 235pps backlog 0b 0p requeues 0 lended: 0 borrowed: 0 giants: 0 tokens: -26351 ctokens: -26351 class htb 1:30 parent 1:1 prio 0 rate 680000bit ceil 680000bit burst 1599b cburst 1599b Sent 12280937 bytes 25428 pkt (dropped 6548, overlimits 0 requeues 0) rate 527480bit 233pps backlog 0b 2p requeues 0 lended: 25426 borrowed: 0 giants: 0 tokens: -274731 ctokens: -274731 -- 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