[LARTC] Shaping and forward

[LARTC] Shaping and forward

[Kenneth Kalmer]

Lartc readers

I have a peculiar problem with shaping and firewalling.

My tc rules work great, below is a smaller version:

#Root
tc qdisc del dev eth0 root
tc qdisc add dev eth0 root handle 1: htb default 100

#Root Class
tc class add dev eth0 parent 1: classid 1:1 htb rate 1024kbit quantum
20000 burst 15k

#Class for each user
tc class add dev eth0 parent 1:1 classid 1:2 htb rate 32kbit ceil
128kbit prio 0 quantum 20000 burst 15k
tc class add dev eth0 parent 1:1 classid 1:3 htb rate 32kbit ceil
128kbit prio 0 quantum 20000 burst 15k
...

# SFQ qdisc for each user class
tc qdisc add dev eth0 parent 1:2 handle 12: sfq perturb 10
tc qdisc add dev eth0 parent 1:3 handle 13: sfq perturb 10
...

#Filters
tc filter add dev eth0 protocol ip parent 1: prio 0 handle 2 fw classid 1:2
tc filter add dev eth0 protocol ip parent 1: prio 0 handle 3 fw classid 1:3
...

#iptables mangle rules
iptables -t mangle -A POSTROUTING -o eth1 -d 192.168.0.1 -j MARK --set-mark 2
iptables -t mangle -A POSTROUTING -o eth1 -d 192.168.0.2 -j MARK --set-mark 2
...

#iptables allow forwarding on MAC address
iptables -A FORWARD -o ppp0 -m mac --mac-source 00:0D:61:30:10:75 -j ACCEPT
iptables -A FORWARD -o eth1 -m mac --mac-source 00:10:B5:01:AA:D0 -j ACCEPT
...

Should note that the default policy of filter->forward is DROP. All
other chains are defaulting on ACCEPT

Now, no users can connect through the gateway. Our test traffic for
the shapping works perfectly, but no internet traffic works. iptables
-nvL output shows that the packets move through the forward chain in
filter, but it doesn't reach the mangle table for marking the packets.
It's as if the packets disappear...

Anybody got some ideas? I still have to test the shaping using u32
matching, using iptables to do forwarding.

Thanks in advance

-- 
Kenneth Kalmer
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Re: [LARTC] Shaping and forward

[Andy Furniss]

Kenneth Kalmer wrote:
> Lartc readers
> 
> I have a peculiar problem with shaping and firewalling.
> 
> My tc rules work great, below is a smaller version:
> 
> #Root
> tc qdisc del dev eth0 root
> tc qdisc add dev eth0 root handle 1: htb default 100
> 
> #Root Class
> tc class add dev eth0 parent 1: classid 1:1 htb rate 1024kbit quantum
> 20000 burst 15k
> 
> #Class for each user
> tc class add dev eth0 parent 1:1 classid 1:2 htb rate 32kbit ceil
> 128kbit prio 0 quantum 20000 burst 15k
> tc class add dev eth0 parent 1:1 classid 1:3 htb rate 32kbit ceil
> 128kbit prio 0 quantum 20000 burst 15k
> ...
> 
> # SFQ qdisc for each user class
> tc qdisc add dev eth0 parent 1:2 handle 12: sfq perturb 10
> tc qdisc add dev eth0 parent 1:3 handle 13: sfq perturb 10
> ...
> 
> #Filters
> tc filter add dev eth0 protocol ip parent 1: prio 0 handle 2 fw classid 1:2
> tc filter add dev eth0 protocol ip parent 1: prio 0 handle 3 fw classid 1:3
> ...
> 
> #iptables mangle rules
> iptables -t mangle -A POSTROUTING -o eth1 -d 192.168.0.1 -j MARK --set-mark 2
> iptables -t mangle -A POSTROUTING -o eth1 -d 192.168.0.2 -j MARK --set-mark 2

You are shaping on eth0 but marking -o eth1

> ...
> 
> #iptables allow forwarding on MAC address
> iptables -A FORWARD -o ppp0 -m mac --mac-source 00:0D:61:30:10:75 -j ACCEPT
> iptables -A FORWARD -o eth1 -m mac --mac-source 00:10:B5:01:AA:D0 -j ACCEPT
> ...

You need a rule to accept -i ppp0.

Andy.

> 
> Should note that the default policy of filter->forward is DROP. All
> other chains are defaulting on ACCEPT
> 
> Now, no users can connect through the gateway. Our test traffic for
> the shapping works perfectly, but no internet traffic works. iptables
> -nvL output shows that the packets move through the forward chain in
> filter, but it doesn't reach the mangle table for marking the packets.
> It's as if the packets disappear...
> 
> Anybody got some ideas? I still have to test the shaping using u32
> matching, using iptables to do forwarding.
> 
> Thanks in advance
> 


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