Nifty Tom Mitchell wrote:
On Sun, Jan 25, 2009 at 08:55:41AM -0600, Gerry Creager wrote:
.....
In other words, it's not the switch. I tend to "think out loud" to
expose all possible failure modes, a process I learned at NASA/Johnson
when I worked on Space Station's Medical Operations. In manned
spaceflight, you have one exercise where you sit around and try to
determine everything that could possibly go wrong, and how such a
failure would manifest itself. That tends to be useful in other
operations, too.
In the spirit of anything could be wacked ....
Double check all the MAC addresss and all the ARP tables (inluding things
like /etc/ethers and HWADDR lines in ifcfg-* and DHCP setup files.
ifcfg files all specify the MAC. arp tables look good. DHCP table
assigns an address based on hard-coded MACs. They're all there, and
appropriate.
Also Zero Configuration Networking (Zeroconfig) networking....
and IPV6 could be exposing alternate logical paths for data
on the same switches and wires.
While IPv6 is "there" in local mode, it's not invoked. All these
systems are really communicating at Layer 2, since they reside on the
same broadcast domain. tracepath doesn't indicate any asymmetrical
paths for the "several" I've manually looked at.
Thanks, gerry
--
Gerry Creager -- gerry.crea...@tamu.edu
Texas Mesonet -- AATLT, Texas A&M University
Cell: 979.229.5301 Office: 979.458.4020 FAX: 979.862.3983
Office: 1700 Research Parkway Ste 160, TAMU, College Station, TX 77843
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