Ascend Archive
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Re: (ASCEND) Feature Requests and Ascend?



On Thu, Oct 09, 1997 at 07:07:51PM -0600, Marc Slemko wrote:
> On Thu, 9 Oct 1997, Tim Basher wrote:
> 
> > I just tried to reproduce your problem here and I was not [fully] able to.
> > I was not able to bring the MAX to its knees or completely destroy performance.
> > I was able to produce a measurable change in latency.  It might or might not
> > be noticeable to a remote user.  I did not measure throughput.
> 
> for h in `jot 60 1 60`; do (nc host 5000 &); done
> 
> across ethernet:
> 
> 64 bytes from xxx: icmp_seq=5 ttl=255 time=1044.850 ms
> 64 bytes from xxx: icmp_seq=6 ttl=255 time=995.315 ms
> 64 bytes from xxx: icmp_seq=7 ttl=255 time=727.330 ms
> 64 bytes from xxx: icmp_seq=8 ttl=255 time=735.823 ms
> 64 bytes from xxx: icmp_seq=9 ttl=255 time=1037.498 ms
> 
> Try a few more (ie. 80) and:
> 
> 45 packets transmitted, 33 packets received, 26% packet loss
> round-trip min/avg/max = 252.679/21128.747/39426.912 ms
> 
> In the above example, it just stops responding to pings or nearly
> any other traffic (if I am telnetted to a termserv prompt it takes
> ~30-60 seconds to echo a keystroke) until the connections are
> closed.  It normally comes back when the sessions are disconnected.
> Sessions over WAN links are brought to an almost complete standstill.

If someone wanted to "take down" UUNET's (or any other provider that
uses a lot of Ascend Max's) dial-up network, I wonder if it would
really be that easy.  Any one volunteering to try?  Those 3l33t d00ds
on IRC are sure to try eventually.

There are a LOT of Black Hats out there.  Both MCSNet and ANet-Chi
(two fairly large midwestern ISP's) were taken out for several hours
within the past two weeks.  Both have at least 2 T-3's to different
backbone providers.  EVERY DAY ISP's, both large and small suffer
Denial of Service Attacks that cripple thier networks.  These attacks
cost ISP's a lot of money.  They piss off customers, require staff to
come into the NOC, degrade service, and take a lot of people's time.

-- 
Eric Wieling (eric@ccti.net), Corporate Communications Technology
Sales: 504-585-7303 (sales@ccti.net), Support: 504-525-5449 (support@ccti.net)
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