Date: Mon, 6 Oct 2003 17:27:55 -0700 From: Luigi Rizzo <rizzo@icir.org> To: pbrezny@purplecat.net Cc: freebsd-ipfw@freebsd.org Subject: Re: dummynet bw limit problem Message-ID: <20031006172755.A71328@xorpc.icir.org> In-Reply-To: <3152.12.150.157.66.1065475412.squirrel@ssl.purplecat.net>; from peter@purplecat.net on Mon, Oct 06, 2003 at 05:23:32PM -0400 References: <3152.12.150.157.66.1065475412.squirrel@ssl.purplecat.net>
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ok, in random order:
First, the bandwidth must be an integer.
$fwcmd pipe 4 config bw .128Mbit/s
+ you should show us the entire config, because 'one_pass=0' means
the 'pipe' rule will not terminate the processing of the
packet, and you might hit some other pipe or rule;
+ the 'bandwidth' in dummynet pipes must be an integer (admittedly,
the manpage does not specify it, and the parser does not complain
as it shoud...); so a command like this
$fwcmd pipe 5 config bw .256Mbit/s
will effectively set an 'unlimited' bandwidth; even worse, something like
$fwcmd pipe 5 config bw 2.56Mbit/s
will parse the '2', then look for a unit specifier, and since the '.'
is unrecognised it will silently assume bits/s which is not what you
want...;
+ finally, i wonder if "via $oif" is really what you want.
"in via $oif" means "in recv $oif";
"out via $oif" means "out { recv $oif or xmit $oif }" but
perhaps you just want one of the two ?
+ tcpdump works at layer 2 so it will show packets on the device,
before (on the input path) they are processed by dummynet;
cheers
luigi
On Mon, Oct 06, 2003 at 05:23:32PM -0400, Peter Brezny wrote:
> Greetings,
>
> I'm having difficulties with dummynet limiting connections when I set the
> bw limit to anything greater than around 900 Kbit/sec.
> Using pipes 1-8 below, even mixed and matched for asymmetric control work
> fine, except when i bring in a pipe numbered 9 or greater.
>
> I've tried changing the queue size from between 20Kbytes to 50Kbytes
> I've tried increasing the buckets to 256
>
> But no luck.
>
> Interestingly, with the configuration below, if I ping a host on the
> internet, tcpdump shows the request and the reply, but I get nothing on
> the console.
>
> If I mix and match the in and outbound pipes, I'll either get nothing on
> the console, or:
> ping: sendto: No buffer space available
>
> On the system i'm testing from i've got:
> sysctl net.inet.ip.fw.one_pass=0
>
> Any suggestions are greatly appreciated.
>
> # traffic shaping test
> $fwcmd add pipe 9 all from any to any out via $oif
> $fwcmd add pipe 10 all from any to any in via $oif
> #
> # pipe configuration.
> # odd pipes are for outbound connections
> # even pipes are for inbound connections
> $fwcmd pipe 1 config bw .064Mbit/s
> $fwcmd pipe 2 config bw .064Mbit/s
> $fwcmd pipe 3 config bw .128Mbit/s
> $fwcmd pipe 4 config bw .128Mbit/s
> $fwcmd pipe 5 config bw .256Mbit/s
> $fwcmd pipe 6 config bw .256Mbit/s
> $fwcmd pipe 7 config bw 512Kbit/s
> $fwcmd pipe 8 config bw 512Kbit/s
> $fwcmd pipe 9 config bw 990Kbit/s
> $fwcmd pipe 10 config bw 990Kbit/s
> $fwcmd pipe 11 config bw 2048kbit/s
> $fwcmd pipe 12 config bw 2048kbit/s
>
>
> Peter Brezny
> purplecat.net
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