While that is running do the tests or verify the lines keep showing up
in /var/log/messages and once that is done use Ctrl+c to stop the
capture and then post it somewhere.
Good luck.
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I did not install a DHCP server on the box. I use my Netgear router for that.
I have ClamAV installed, and have had no notifications of any infections.
I have changed to dhclient. If that does not fix things, I will try your other suggestions.
Let me say a little more about why I switched to dhclient.
But first - broadcasting for a lease is normal. It is the repeated broadcast you are seeing that is a problem. It seems that your system broadcasts for a lease, is assigned an IP, and then receives an NAK when it attempts to use it. That looks wrong.
The problem I had was back with opensuse 11.3. The system would broadcast for a lease, and get one. That part was fine. But when the lease was running out, it failed in attempts to renew the lease. That is probably happening to you, also. Because of the failed renewal, the lease would run out, the network was reset (closing any open connections), and then a broadcast for least started over.
With dhclient, that didn’t happen. The renewals worked, so it never broadcast for a lease except just after booting.
I had this problem only at work. On my home network with the router providing the dhcp service, either dhcpcd or dhclient seems to do quite well.
Since “dhclient” is the ISC software, it probably conforms to the standards a little better than “dhcpcd” or at least it has probably been more thoroughly tested for working with a variety of dhcp servers. In any case, only your own testing can show what works best for your setup.