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Karl J Rink

2004-Oct-20 20:24 UTC

throttle particular client ip

I know this will be trivial for most, but I am having trouble with getting
my scenario to work correctly.  I want to ''tag'' and
''throttle'' the
bandwidth to and from a particular client on my lan side.  Better yet, I
just want to throttle smtp traffic, per say, for that ip.


----lan----------eth1-[linux.box]-eth0----------internet

I have used the technique provided by smueller@chronox.de and his
limit.conn-0.2 perl script, which basically does the following:

  iptables --append PREROUTING --in-interface eth0 --table mangle \
            --protocol tcp --source $SERVERIP \
            --source-port $SERVERPORT --jump MARK --set-mark 0x1

  tc qdisc add dev eth0 handle ffff: ingress

  tc filter add dev eth0 parent ffff: protocol ip prio 50 handle \
  0x1 fw police rate 1kbit burst 1500 mtu 9k drop flowid :0x1


This works great!  But all clients on the lan side are throttled for what
ever $SERVERIP and $SERVERPORT that are marked.

I have yet to be able to syntactially provide the reversal onto a client.

And, I''m not even sure if I need to utilize iptables for what I want to
do?
And, If iptables are needed for the ''marking'' of the traffic,
would I use
the POSTROUTING (which I''ve tried)?

I''m thinking that simply utilizing tc on the linux.box for a particular
interface (either eth0 or eth1) should work, but have not had luck in this
saga thus far.

Any help, advice, direction, will be apprecicated.

Also to note, as a newbie to tc, htb seems to be the most utilized in the
mail threads.  And the man pages for tc mention (and your lartc.org
howto''s) say cbq is more for link sharing.

Thank you for your time and consideration,
--Karl



MailKey: GUINNESS
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Karl J Rink

2004-Oct-20 22:37 UTC

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Re: throttle particular client ip

Thank you, this is what I have so far...
client 172.24.5.32 is downloading
ftp://download.fedora.redhat.com/pub/fedora/linux/core/2/i386/iso/FC2-i386-DVD.iso
average speed is ~ 135 kB/s via ncftp

on linux.box>
sh rc.throttleServer download.fedora.redhat.com 21
and clients download continues to drop, decline, it basically works.
-----------------------------------------------------------------
cat rc.throttleServer
#!/bin/sh
# Date: Tue Oct 19 11:41:10 PDT 2004

CMDNAME=`basename $0`

if [ ! $1 ]; then
        echo "no IPADDR"
        echo "Useage: $0 IPADDR PORT"
        exit 0
fi

if [ ! $2 ]; then
        echo "no PORT"
        echo "Useage: $0 IPADDR PORT"
        exit 0
fi

IPTABLES=/sbin/iptables
DEV=eth0
SERVERIP=$1
SERVERPORT=$2:65535
LIMIT=1kbit
HANDLE=0x1
TC=/sbin/tc


  ###############################################################
  # tag all incoming SYN packets through $DEV as mark value 1
  ###############################################################

  $IPTABLES --append PREROUTING --in-interface $DEV --table mangle \
            --protocol tcp --source $SERVERIP \
            --source-port $SERVERPORT --jump MARK --set-mark $HANDLE

  ############################################################
  # install the ingress qdisc on the ingress interface
  ############################################################
  $TC qdisc add dev $DEV handle ffff: ingress 2>/dev/null


  ############################################################
  # utilize ingress qdisc
  ############################################################
  $TC filter add dev $DEV parent ffff: protocol ip prio 50 handle \
  $HANDLE fw police rate $LIMIT burst 1500 mtu 9k drop flowid :$HANDLE

--------------------------------------------------------------------------
details:
iptables -nL -t mangle
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination
MARK       tcp  --  209.132.176.20       0.0.0.0/0          tcp
spts:21:65535 MARK set 0x1
MARK       tcp  --  209.132.176.220      0.0.0.0/0          tcp
spts:21:65535 MARK set 0x1
MARK       tcp  --  209.132.176.221      0.0.0.0/0          tcp
spts:21:65535 MARK set 0x1
MARK       tcp  --  66.187.224.20        0.0.0.0/0          tcp
spts:21:65535 MARK set 0x1

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination

tc -s qdisc
qdisc ingress ffff: dev eth0 ----------------
 Sent 44458 bytes 238 pkts (dropped 23, overlimits 0)

########################################################################

but, with the newer revised iptables syntax, I do not seem to be marking
properly?, because tc never reports a ''dropped'' packet.  And
it basically
does not work...

sh rc.throttleS+C download.fedora.redhat.com 21 172.24.5.32
--------------------------------------------------------------------
cat rc.throttleS+C
#!/bin/sh
# Date: Wed Oct 20 15:32:53 PDT 2004

CMDNAME=`basename $0`

if [ ! $1 ]; then
        echo "no SERVERIP"
        echo "Useage: $0 SERVERIP PORT LANCLIENT"
        exit 0
fi

if [ ! $2 ]; then
        echo "no PORT"
        echo "Useage: $0 SERVERIP PORT LANCLIENT"
        exit 0
fi

if [ ! $3 ]; then
        echo "no LANCLIENT"
        echo "Useage: $0 SERVERIP PORT LANCLIENT"
        exit 0
fi

IPTABLES=/sbin/iptables
DEV=eth0
SERVERIP=$1
SERVERPORT=$2:65535
LANCLIENT=$3
LIMIT=1kbit
HANDLE=0x1
HANDLE2=0x2
TC=/sbin/tc


  ###############################################################
  # tag all incoming SYN packets through $DEV as mark value 1
  ###############################################################

  $IPTABLES --append PREROUTING --in-interface eth0 --table mangle \
            --protocol tcp --source $SERVERIP \
            --source-port $SERVERPORT \
            --destination $LANCLIENT \
            --jump MARK --set-mark $HANDLE

  $IPTABLES --append PREROUTING --in-interface eth1 --table mangle \
            --protocol tcp --destination $SERVERIP \
            --destination-port $SERVERPORT --source $LANCLIENT \
            --jump MARK --set-mark $HANDLE2

  ############################################################
  # install the ingress qdisc on the ingress interface
  ############################################################
  $TC qdisc add dev $DEV handle ffff: ingress 2>/dev/null
  $TC qdisc add dev eth1 handle ffff: ingress 2>/dev/null


  ############################################################
  # utilize ingress qdisc
  ############################################################
  $TC filter add dev $DEV parent ffff: protocol ip prio 50 handle \
  $HANDLE fw police rate $LIMIT burst 1500 mtu 9k drop flowid :$HANDLE

  $TC filter add dev eth1 parent ffff: protocol ip prio 50 handle \
  $HANDLE fw police rate $LIMIT burst 1500 mtu 9k drop flowid :$HANDLE2

---------------------------------------------------------------------
some details:
tc -s qdisc
qdisc ingress ffff: dev eth0 ----------------
 Sent 12955351 bytes 9145 pkts (dropped 0, overlimits 0)

 qdisc ingress ffff: dev eth1 ----------------
 Sent 267129 bytes 6408 pkts (dropped 0, overlimits 0)

iptables -nL -t mangle
Chain PREROUTING (policy ACCEPT)
target     prot opt source               destination
MARK       tcp  --  209.132.176.220      172.24.5.32        tcp
spts:21:65535 MARK set 0x1
MARK       tcp  --  209.132.176.221      172.24.5.32        tcp
spts:21:65535 MARK set 0x1
MARK       tcp  --  66.187.224.20        172.24.5.32        tcp
spts:21:65535 MARK set 0x1
MARK       tcp  --  209.132.176.20       172.24.5.32        tcp
spts:21:65535 MARK set 0x1
MARK       tcp  --  172.24.5.32          209.132.176.221    tcp
dpts:21:65535 MARK set 0x2
MARK       tcp  --  172.24.5.32          66.187.224.20      tcp
dpts:21:65535 MARK set 0x2
MARK       tcp  --  172.24.5.32          209.132.176.20     tcp
dpts:21:65535 MARK set 0x2
MARK       tcp  --  172.24.5.32          209.132.176.220    tcp
dpts:21:65535 MARK set 0x2

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

Chain POSTROUTING (policy ACCEPT)
target     prot opt source               destination
#######################################################################
#######################################################################

i''m thinking of moving on to just the tc tbf cmds...  I seem to be
having
luck with that a bit, just need to figure out how to ''tc tbf''
a specific
ip addr and not worry about iptables mangle cmds??

tc qdisc add dev eth0 root tbf rate 1bps latency 50ms burst 1540

--Karl



> Karl J Rink schrieb:
>> I know this will be trivial for most, but I am having trouble with
>> getting
>> my scenario to work correctly.  I want to ''tag'' and
''throttle'' the
>> bandwidth to and from a particular client on my lan side.  Better yet,
I
>> just want to throttle smtp traffic, per say, for that ip.
>>
>>
>> ----lan----------eth1-[linux.box]-eth0----------internet
>>
>> I have used the technique provided by smueller@chronox.de and his
>> limit.conn-0.2 perl script, which basically does the following:
>>
>>   iptables --append PREROUTING --in-interface eth0 --table mangle \
>>             --protocol tcp --source $SERVERIP \
>>             --source-port $SERVERPORT --jump MARK --set-mark 0x1
>>
> Hi,
>
> i´m yet not very familiar to LARTC but based on the IPTables settings it
> will throttle the traffic for all clients because you mark it so for tc.
> In words it means that before your box routes it marks all traffic
> coming in on eth0 with the $SERVERPORT and $SERVERIP with 0x1. So that
> tc can handle it. But there is no dependency on a certain client as you
> want it to. So every client will get throttled. Perhaps try this don´t
> know if it works:
>
> iptables --append PREROUTING --in-interface eth0 --table mangle \
>           --protocol tcp --source $SERVERIP \
>           --source-port $SERVERPORT --destination $LANCLIENT \
>           --jump MARK --set-mark 0x1
>
> iptables --append PREROUTING --in-interface eth1 --table mangle \
>           --protocol tcp --destination $SERVERIP \
>           --destination-port $SERVERPORT --source $LANCLIENT \
>           --jump MARK --set-mark 0x2
>

MailKey: GUINNESS
_______________________________________________
LARTC mailing list / LARTC@mailman.ds9a.nl
http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/

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