ipfw - bandwidth throttling (sanity check!)

[Odhiambo Washington]

* On 12/09/06 22:13 +0100, RW wrote:
| On Tuesday 12 September 2006 20:49, Odhiambo Washington wrote:
| > Hello Security guy ;)
| >
| > I have tried very hard to understand ipfw just for the purpose of
| > bandwidth throttling for smtp service.
| >
| > Basically, I want to throttle the bandwidth used by my SMTP
| > server outbound to _anyone_ else except my ip blocks.
| >
| > My Server is 1.2.3.4 and my ip blocks are a.b.c.d/19 and
| > e.f.g.h/20
| >
| >
| > Are the following rules sane enough?
| >
| >         ipfw pipe 1 config bw 256Kbit/s
| >         ipfw add pipe 1 tcp from 1.2.3.4 to not a.b.c.d/19 25
| >         ipfw add pipe 1 tcp from 1.2.3.4 to not e.f.g.h/20 25
| 
| This queues all outgoing smtp to the pipe. 
| 
| You also need to set  net.inet.ip.fw.one_pass=1 to avoid the packets 
| re-entering the rules on the next line.  Setting that means that the packets 
| cannot pass through dynamic rules. It is possible to use dynamic rules with 
| dummynet, but it's a pain.

Thank you so much for clarifying that. What I wanted to be clarified is
if it is true that "smtp traffic to a.b.c.d/19 and e.f.g.h/20" is NOT
being put through this pipe..

net.inet.ip.fw.one_pass=1 seems to be the default on my system. Not sure
why, but I will RTFM about it.


-Wash

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