nanog mailing list archives

Re: Some very strange network behaviors


From: Gregory Hicks <ghicks () cadence com>
Date: Thu, 11 Sep 2003 14:30:42 -0700 (PDT)



Date: Thu, 11 Sep 2003 13:35:37 -0700
From: Crist Clark <crist.clark () globalstar com>

Mike Lewinski wrote:

[...snip...]
OS's IP stack is misbehaving badly, Zone Alarm should not see the traffic
on the LAN that does not have his MAC address on it.

How would a switch/router be deciding that these other IP addresses 
should go to his PC's NIC (MAC address)?

Unless the switch got confused when the MAC address changed as it
did...?  Then the switch would go into "broadcast" or "flood" mode
where every packet is delivered to evey port because the switch doesn't
know where to send it.

Regards,
Gregory Hicks

-- 
Crist J. Clark                               crist.clark () globalstar com
Globalstar Communications                                (408) 933-4387

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Gregory Hicks                           | Principal Systems Engineer
Cadence Design Systems                  | Direct:   408.576.3609
555 River Oaks Pkwy M/S 6B1             | Fax:      408.894.3479
San Jose, CA 95134                      | Internet: ghicks () cadence com

Never attribute to malice that which is adequately explained by
ignorance or stupidity.

Asking the wrong questions is the leading cause of wrong answers

"The best we can hope for concerning the people at large is that they
be properly armed." --Alexander Hamilton


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