On May 22, 2007, at 11:56 AM, Peter Eisch wrote:
> Is there a tool native or pkgsrc that can be used to
introduce
> network delay
> based on the source or destination address? I could
see altq being
> used to
> throttle usage, but I'd like to simulate both
terrestrial and
> satellite
> connections between interfaces on my netbsd router.
>
> I'd imagine this being a userland program that uses a
tap interface
> on each
> side of the router that includes a config with src,
dst, delay triads.
>
> Any pointers someone can afford to spare?
ALTQ or IPFW+dummynet are the two common approaches to
introducing
network bandwidth management or adding latency, and you
should be
able to configure rulesets to match specific src or dst
netblocks as
needed. It would not be impossible to write a userland tool
to do
something similar, perhaps using divert sockets the way the
userland
natd program works, or perhaps to use a proxy (either
explicit or
transparent proxy) approach instead.
--
-Chuck
PS: However, it's not clear whether NetBSD has imported
IPFW+dummynet
from FreeBSD; if not, then using FreeBSD as your platform
might be
better for this sort of testing....
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