Re: tcpdump - performs what on initialization?

["Derek D. Newton" <derek () tera-byte com>]

 Promiscuous doesn't seem to have anything to do with it, as starting
tcpdump with -p does bring up the interface again, and putting the
interface into promisc mode does nothing.
 This is an annoying problem, as it is only a daily occurance on the odd
server, under heavy traffic load.. I havn't been able to catch one since
you suggested allmulti or ioctl to try.
 Sorry for my lack of knowledge, but how would I send an ARP to test if a
gratuitous arp is causing the interface to come unwedged?

 D

Jefferson Ogata said:
> Guy Harris wrote:
> > On Fri, Apr 11, 2003 at 12:34:47PM -0400, Jefferson Ogata wrote:
> >
> > > For one thing ifconfig down/up sends a gratuitous arp. If gratuitous
> > > arp  solves the problem, you may have an IP address conflict on your
> > > LAN.
> >
> > That wouldn't explain why running tcpdump unwedges the interface,
> > however, unless on the version of Linux his servers are running, doing
> > so causes a gratuitious ARP.
>
> Clearly, but perhaps in promiscuous mode his machine starts getting IP
> traffic  again, responds to something, and this unwedges the interface.




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