Subject: Re: tcpdump -i epic0 resets the interface?
To: None <>
From: Justin C. Walker <>
List: tech-net
Date: 11/19/2002 20:53:04
On Tuesday, November 19, 2002, at 03:11 PM, Andrew Gillham wrote:

> On Wed, Nov 13, 2002 at 11:40:11PM +0100, Manuel Bouyer wrote:
>> On Tue, Nov 12, 2002 at 03:51:05PM -0800, Andrew Gillham wrote:
>>> In debugging my IPv6 issue I discovered that tcpdump on the epic0 in 
>>> my
>>> main server causes the interface to reset, or at least hang for some 
>>> time.
>>> Open connections to the box usually timeout before this completes, 
>>> but not
>>> always.
> Is it absolutely necessary for the link to bounce in this case?
> Can I force the card into promiscuous mode all the time?  It is on a 
> switch
> port, so traffic shouldn't be a serious problem.  I don't usually have 
> any
> unicast flooding on my switch.

Perhaps more important is the amount of broad/multicast traffic on your 
network.  Another issue is whether the box in question is routing (I 
haven't followed this thread from the beginning): if it is, promiscuous 
mode is generally A Bad Thing.

My 0.02 euros...



Justin C. Walker, Curmudgeon-At-Large  *
Institute for General Semantics        |   If you're not confused,
                                        |   You're not paying attention