Well, here is something strange. The machine in question is on the
network via a Network Manager, connection "eth0 home". "eth0 home" is a
static-IP configuration for eth0 - the device IP, its netmask, router,
DNSes, etc are all given explicitly in Network Manager for this
connection. The IP is supposed to be 69.12.176.91. However, I noticed
that instead the IP was 69.12.176.95. This is last IP of the 8-IP
allowed range on my home network. It is what dhcp would have given, I
think. But, I verified dhclient is not running - "killall dhclient"
yields "dhclient: no process found". I also verified that in Network
Manager, the active connection is "eth0 home" under "wired networks".
There is no way the eth0 IP should have been 69.12.176.95. I
disconnected "eth0 home", and then reconnected it (under Network
Manager), and the IP went to 69.12.176.91. The problem with my machine
dropping connections - ssh logins to remote hosts - seems to have
stopped. I have now gone 12hrs without a dropped connection (ie: the
"Read from remote host isildur: Connection reset by peer"). So there is
nowtwo questions: How did this happend? and How would it cause the
dropped connections?

I do use dhclient when I use this laptop with WiFi networks, and also
one wired network - but never for my home network, "eth0 home", which is
where this problem was happening - and dhclient was not running. How did
the IP get set to the wrong value? Does hibernate & thaw kill a running
version of dhclient when it shuts down the network connection(s)? If
dhclient survived a hibernate & thaw, could it have changed the eth0 IP,
then exited, leaving no trace that it was responsible?

Even so, simply having the wrong IP on eth0 shouldn't cause the network
connections to be periodically dropped, or so I would think. The only
issue I can imagine is that hostname reports fingon.cosmology.name, and
nslookup of fingon.cosmology.name yields 69.12.176.91. Could having the
wrong IP for one's hostname cause network connections to be dropped? I
would not think so. But, clearly something strange & buggy is going on.

Anyone have any insight?

Thanks,
Greg Huey

-- 
Loosing connections with "Connection reset by peer" message
https://bugs.launchpad.net/bugs/522819
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