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Hi there!
Well, as an exercise, I try 'simulating' an adsl link (just the speed ;o))
with a GRE tunnel and HTB for bandwidth limiting. Typically in germany
adsl has about 1024kbit downstream and 128kbits upstream (yes, there are
others ;) but these are what I have) - which are the values i try to simulate.
Here is the snipped that does the real thing on the client-side:
- -----snip-----
~ 23 # now setup shaping to dsl-like-speed (up:128, down:1024 - this \
~ is the dsl-client)
~ 24 $tc qdisc del dev $tun root >&- 2>&-
~ 25 $tc qdisc add dev $tun root handle 1: htb
~ 26
~ 27 # shapiung class of root --> not more than 1mbit bandwidth
~ 28 $tc class add dev $tun parent 1: classid 1:1 htb rate 1mbit \
~ burst 0 cburst 128
~ 29
~ 30 # this is for downstream
~ 31 $tc class add dev $tun parent 1:1 classid 1:10 htb rate 1mbit
~ 32 # this does upstream
~ 33 $tc class add dev $tun parent 1:1 classid 1:20 htb rate \
~ 128kbit burst 0 cburst 128
~ 34
~ 35 # add fairness queues for up- and downstream classes
~ 36 $tc qdisc add dev $tun parent 1:10 handle 10: sfq perturb 5
~ 37 $tc qdisc add dev $tun parent 1:20 handle 20: sfq perturb 5
~ 38
~ 39 # now take care of what is up- and what ist down-steam
~ 40 U32="$tc filter add dev $tun protocol ip parent 1:0 prio 1 u32"
~ 41 # everything that is from me is upstream
~ 42 $U32 match ip src $tunip flowid 1:20
~ 43 # everthing that comes to me is downstream
~ 44 $U32 match ip dst $tunip flowid 1:10
- -----snap-----
eplanations:
$tunip is the ip of this end of the tunnel
$tc = tc
OK, I tryied this setup and noticed that approximately every 60 seconds,
the bandwidth gues up to about 256kbits for about 3 seconds - I have no
explanation for this - well, I do not really know what to set as parameter
for burst/cburst...
Any ideas, grave mistakes?
thanks a lot,
Marcus Fritzsch
- --
~ s(c,t){return isalpha(c)&&t?/*
Marcus Fritzsch <marcus.fritzsch@xxxxxxx> ICQ:53118621 WWW:fritschy.de
~ GnuPG: gpg --keyserver sks.keyserver.penguin.de --recv-keys 98A1D365
*/s(65-c&&97-c?--c:c+25,--t):c;}main(){for(;;)putchar(s(getchar(),13));}
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