On Tue, 2007-Jan-23 14:22:54 -0500, Andresen, Jason R. wrote: >I have a project that requires me to simulate a link with varying but >well defined delay. The link is guarenteed to deliver packets in >order, so I wish to maintain that behavior with Dummynet.
I don't think dummynet can do this in its current form. Based on a quick look at the source, the packet delivery time is set to the current time plus the current delay when the packet arrives (see sys/netinet/ip_dummynet.c:move_pkt(). This means that changing the delay will not affect existing queued packets. Changing dummynet to allow variable delays whilst maintaining packet order is not immediately trivial. The only option I can see would be to change the dummynet curr_time (net.inet.ip.dummynet.curr_time) to increment at variable rate instead of one count per tick. You would probably need to do some fiddling to provide anything better than very coarse delay variation. -- Peter Jeremy
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