Subject: Re: bin/29126: tcpdump leads to packet loss
To: None <firstname.lastname@example.org, email@example.com,>
From: Christos Zoulas <firstname.lastname@example.org>
Date: 01/27/2005 11:39:25
On Jan 27, 4:06pm, email@example.com (Kimmo Suominen) wrote:
-- Subject: Re: bin/29126: tcpdump leads to packet loss
| The following reply was made to PR kern/29126; it has been noted by GNATS.
| From: firstname.lastname@example.org (Kimmo Suominen)
| To: email@example.com
| Subject: Re: bin/29126: tcpdump leads to packet loss
| Date: Thu, 27 Jan 2005 11:05:26 -0500 (EST)
| I see the loss of traffic also happening on tlp and gsip and using dumb
| switches (i.e. no STP in use).
| It definitely was not happening with earlier versions of NetBSD.
| The only "old" version I have around anymore is 1.6B. The NIC's I have
| on that are fxp and tlp. Neither one exhibits this problem.
| How to test: start tcpdump on the interface you are connected over,
| and hit RETURN repeatedly to verify if tty echoes it back immediately.
| inet-fw:~# tcpdump -i tlp0 port 22
| tcpdump: listening on tlp0
Some nics reset the interface when they enter or exit promiscuous mode,
dropping link. If you are connected over a switch
that does spanning tree it might take some time to recalc. During that
time, the network does not work at all over that interface.