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From: Vitalij Satanivskij <satan@ukr.net>
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Subject: dhclient cause up/down cycle after 239356 ?
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Hi all,

After last update my home machine begin doin some strange things - 

Aug 21 08:28:25 home kernel: fxp0: link state changed to UP
Aug 21 08:28:25 home kernel: fxp0: link state changed to DOWN
Aug 21 08:28:27 home kernel: fxp0: link state changed to UP
Aug 21 08:28:33 home dhclient: New IP Address (fxp0): xx.xx.xx.xx
Aug 21 08:28:33 home kernel: fxp0: link state changed to DOWN
Aug 21 08:28:33 home dhclient: New Subnet Mask (fxp0): 255.255.255.0
Aug 21 08:28:33 home dhclient: New Broadcast Address (fxp0): xx.xx.xx.255
Aug 21 08:28:33 home dhclient: New Routers (fxp0): xx.xx.xx.1
Aug 21 08:28:33 home dhclient[1395]: Interface fxp0 is down, dhclient exiting
Aug 21 08:28:33 home dhclient[1339]: connection closed
Aug 21 08:28:33 home dhclient[1339]: exiting.
Aug 21 08:28:35 home kernel: fxp0: link state changed to UP
Aug 21 08:28:35 home kernel: fxp0: link state changed to DOWN
Aug 21 08:28:37 home kernel: fxp0: link state changed to UP
Aug 21 08:28:40 home dhclient: New IP Address (fxp0): xx.xx.xx.xx
Aug 21 08:28:40 home kernel: fxp0: link state changed to DOWN
Aug 21 08:28:40 home dhclient: New Subnet Mask (fxp0): 255.255.255.0
Aug 21 08:28:40 home dhclient: New Broadcast Address (fxp0): xx.xx.xx.255
Aug 21 08:28:40 home dhclient: New Routers (fxp0): xx.xx.xx.1
Aug 21 08:28:40 home dhclient[1519]: Interface fxp0 is down, dhclient exiting
Aug 21 08:28:40 home dhclient[1465]: connection closed
Aug 21 08:28:40 home dhclient[1465]: exiting.
Aug 21 08:28:42 home kernel: fxp0: link state changed to UP
Aug 21 08:28:42 home kernel: fxp0: link state changed to DOWN
Aug 21 08:28:44 home kernel: fxp0: link state changed to UP
Aug 21 08:28:48 home dhclient: New IP Address (fxp0): xx.xx.xx.xx

I have next configuration 

in rc.conf - ifconfig_fxp0="SYNCDHCP"
in /etc/dhclient.conf 
 interface "fxp0" {
   supersede domain-name "home";
   supersede domain-name-servers 127.0.0.1;
 }

Also /etc/start_if.fxp0
With content - 

ifconfig fxp0 ether xx:xx:xx:xx:xx:xx
ifconfig fxp0 -tso
ifconfig fxp0 polling

And yes, no problem with static ip on fxp0 and no up/down sequence