Your ISP may have setup an idle timer.

Try a "keep alive" type of program or just setup an automated ping
to an outside address every 5 minutes.

See if that stops the drops.

  ----- Original Message -----
  From: "Yamil Chamut"
  To: m0n0wall at lists dot m0n0 dot ch
  Subject: [m0n0wall] wan ip renewal interval
  Date: Tue, 13 Feb 2007 16:44:08 -0300


  Hi, first of all, sorry about my bad english :(

  The last month my ISP has started to have some problems, the modem
  looses the signal almost three or four times a day, and it takes
  between 15 and 30 minutes to go online again. When this happens,
  once the modem it's online again, i have to manually release and
  renew ip from m0n0wall web interface, or wait to m0n0wall sends a
  dhcprequest, that means a couple of hours. It isn't a big problem
  whem I am here, but when I'm not, my servers remains offline a
  couple of ours...

  The cuestion is, is there any way to modify the time between
  dhcprequest to my ISP?


  I can see this on the logs page:

  Feb 13 16:26:14 dhclient: bound to 24.232.66.192 -- renewal in 14900
  seconds.

  So, if the modem drops the connection at 17:00, it will remain
  offline until 20:30?


  Thank you, and again, sorry about my english.

  Yamil Chamut