LARTC - Feb 2007 - HTB Troubleshooting

Hello all,

Probably a silly problem as a result of lack of understanding here, but
I''m
having some trouble with a supposedly simple shaping script here.

I have a bunch of IPs on an interface tun0 (VPN clients) which I''m
trying to
rate limit to 5Mbps default, and then set externally by a script to 1Mbps or
10Mbps. All traffic goes out of eth0 from the clients - no routeback.

Shaping doesn''t seem to be working correctly (user''s upload is
~250KB/sec +
when it''s meant to be rate limited to 1Mbps  - ip ending .6 - the
corresponding class id is 1:6 in the below/attached logs)

Here''s my tc script:

### tun0 setup
        tc qdisc add dev tun0 root handle 1: htb default 99
        tc class add dev tun0 parent 1: classid 1:1 htb rate 100mbit
        tc class add dev tun0 parent 1:1 classid 1:99 htb rate 100mbit

### eth0 setup
        tc qdisc add dev eth0 root handle 1: htb default 99
        tc class add dev eth0 parent 1: classid 1:1 htb rate 100mbit
        tc class add dev eth0 parent 1:1 classid 1:99 htb rate 100mbit

### shaping for users, 5Mbps down, 5Mbps up. default for beta test
for q in `seq 2 30` ; do
        d=`printf "%x" $q`
        ### tun0
                 tc class add dev tun0 parent 1:1 classid 1:$q htb rate
5Mbit
                 tc filter add dev tun0 protocol ip parent 1:0 prio 1 u32
match ip dst 208.100.21.$q flowid 1:$q

        ### eth0
                 tc class add dev eth0 parent 1:1 classid 1:$q htb rate
5Mbit
                 tc filter add dev eth0  protocol ip parent 1:0 prio 1 u32
match ip src 208.100.21.$q flowid 1:$q

done

attached is the output of "tc -s -d class show dev tun0" and "tc
-s -d class
show dev eth0", as well as "tc -s -d filter show dev eth0"  (they
were
fairly long).


[root@chi01-050-05 shorewall]# tc -s -d qdisc show dev eth0
qdisc htb 1: r2q 10 default 99 direct_packets_stat 29 ver 3.17
 Sent 1749531575 bytes 2569426 pkts (dropped 0, overlimits 875543 requeues
0)
 backlog 3p

[root@chi01-050-05 shorewall]# tc -s -d qdisc show dev tun0
qdisc htb 1: r2q 10 default 99 direct_packets_stat 1 ver 3.17
 Sent 750893493 bytes 1188097 pkts (dropped 1575, overlimits 334927 requeues
0)

Several users were using Bittorrent at the time - including .6.

Can anyone shed some light on how best to fix this problem, or any
additional information you may need?

Thank you,

Jan



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