Hello all, I have an end host with just 1 physical network card whose address is a.b.c.d, and I need to throttle the outgoing bandwidth from a set of aliased IP address to a remote server e.f.g.h. I''m running RedHat 7.1 with 2.4.2 kernel. I have attached 192.168.10.1 to eth0:1 and 192.168.10.2 to eth0:2 I have set up NATting for these aliases addresses by: iptables -A POSTROUTING -t nat -s 192.168.10.1 -j SNAT --to a.b.c.d iptables -A POSTROUTING -t nat -s 192.168.10.2 -j SNAT --to a.b.c.d I have also set up bandwidth limitation using tc: tc qdisc add dev eth0 root handle 10: cbq bandwidth 10Mbit avpkt 1000 tc class add dev eth0 parent 10:0 classid 10:1 cbq bandwidth 10Mbit \ rate 10Mbit allot 1514 weight 1Mbit prio 8 maxburst 20 avpkt 1000 tc class add dev eth0 parent 10:1 classid 10:100 cbq bandwidth 10Mbit \ rate 56kbit allot 1514 weight 5Kbit prio 5 maxburst 20 avpkt 1000 \ bounded tc qdisc add dev eth0 parent 10:100 sfq quantum 1514b perturb 15 tc filter add dev eth0 parent 10:0 protocol ip prio 100 u32 match ip \ dst e.f.g.h flowid 10:100 I have written a little program that could connect to e.f.g.h using the aliases IPs, transfer a file, and measure the throughput (similar to ftp except using private IP). However, I was seeing throughput far greater than the expected 56Kbps (around 1Mbps). It doesn''t seem like any packets are being sent to handle 10:100, looking from the output for ''/sbin/tc -s -d class ls dev eth0'': -----------begin output----------- class cbq 10: root rate 10Mbit cell 8b (bounded,isolated) prio no-transmit/8 weight 10Mbit allot 1514b level 2 ewma 5 avpkt 1000b maxidle 23us Sent 4469982 bytes 4672 pkts (dropped 0, overlimits 0) borrowed 0 overactions 0 avgidle 624 undertime 0 class cbq 10:100 parent 10:1 leaf 8021: rate 56Kbit cell 8b (bounded) prio 5/5 weight 5Mbit allot 1514b level 0 ewma 5 avpkt 1000b maxidle 123062us Sent 0 bytes 0 pkts (dropped 0, overlimits 0) borrowed 0 overactions 0 avgidle 3.22605e+06 undertime 0 class cbq 10:1 parent 10: rate 10Mbit cell 8b prio no-transmit/8 weight 1Mbit allot 1514b level 1 ewma 5 avpkt 1000b maxidle 23us Sent 0 bytes 0 pkts (dropped 0, overlimits 0) borrowed 0 overactions 0 avgidle 624 undertime 0 -----------end output----------- Is what I''m trying to achieve possible? What am I missing? Is it because I added the rules to eth0 but the aliased IPs are on eth0:1 and eth0:2? Any help would be greatly appreciated! Shirley