[lug] Linux boxes drop off the net? Router problem?

[Gary Frerking (TurboPower)]

>> From: Blaine Berger <blaine at e-oasis.com>

>> Gary - Be certain you are not unintentionally running a routing protocol
(routed or gated) to learn routes from other routers. Do a "ps ax | grep
routed" (or gated) to be certain. <<

Very good point.

I just verified that neither routed or gated are running on at least one of
the systems that is showing the symptoms.

I also just ran a test that Sebastian Sobolewski suggested yesterday. I
logged into an external shell account and pinged our Linux boxes to find a
"dead" one (which answers another question somebody asked -- they don't all
die at the same time). Once I found a dead one, I pinged from that box to an
outside address and I was immediately able to ping the machine from my
external shell account.

So...that gives me a workaround hack of setting up a periodic ping on the
affected boxes to keep them visible.

A step in the right direction, but I really want to drill down to the root
cause and fix it there if possible.

One of the tests we did previously (we connected one of the Linux boxes
directly to the router, and it still showed the symptoms) would seem to
eliminate to switch and point to the router.

I'll do some info digging with that in mind -- but routers definitely aren't
my area of expertise.

If anyone can think of some sort of configuration that can cause (or fix)
this problem, I'd love to hear it.

Again, it's a Cisco 2516. Fwiw, we'll be switching over to a Cisco 2640 in a
couple months.

-- Gary