6.x, 4.x ipfw/dummynet pf/altq - network performance issues

Freddie Cash fcash at ocis.net
Thu Feb 15 21:57:30 UTC 2007

On Thursday 15 February 2007 01:29 pm, Justin Robertson wrote:
>     Send a flood of 60 byte syn packets with the tcp sack option thru
> it and check out what happens. It's pretty weird and I can't explain
> why. If you block the packets on the box via ipfw it's fine, the second
> it has to make a routing decision everything goes out the window, it
> seems. There's 100% packet loss on all protocols. I'm not using NAT,
> there are real IPs in different C classes on the other side of the box.

Is that something that would occur normally?  Or is this a 
worst-case/stress-test trying to break things?  How are you generating 
the packets?

I'm not a network guru, and haven't done much in the way of 
network-related stress-testing, but I'm always looking for ways to do so.

Freddie Cash
fcash at ocis.net

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