a small snippet that will stop you from splitting a server from a netsplit pretty simple,add to your remotes Alt+r the code does all the work nothing to turn on or off .

on ^*:quit: {
  var %split.cache, %split.server
  %split.cache = $1-
  if ($gettok($server,6,46) = $null) { %split.server = $gettok($server,4-5,46) }
  if ($gettok($server,5,46) = $null) { %split.server = $gettok($server,3-4,46) }
  if ($gettok($server,4,46) = $null) { %split.server = $gettok($server,2-3,46) }
  if (%split.server isin $1) && (%split.server isin $2) {
    .timerSPLIT -o 1 2 kernel.echosplit %split.server %split.cache
    .auser QUIT $fulladdress
    inc %split.users
    %split.chan = $comchan($nick,1)
    %split.servers = %split.server
    haltdef 
    halt
  }
  if ($group(#Kernel.Ch.Events = on)) {
    set %temp.parms $1-
    Kernel.play.all - 7[QUIT7] - 7 $nick (4 $+ $fulladdy($nick) $+ 7) has QUIT " $+ $1- $+ "
    haltdef
    halt
  }
}
on ^+QUIT:join:#: {
  %split.chan = $chan
  .timerSPLIT -o 1 1 kernel.echojoin #
  .ruser QUIT $fulladdress
  inc %split.users
  haltdef
  halt
}
alias kernel.echojoin {
  echo $colour(info2) %split.chan $timestamp Netsplit Rejoin Detected and Blocked.
  echo $colour(info2) %split.chan $timestamp $kernel.echousers(%split.users) $kernel.echosplitchan(%split.chan) 
  .timer -o 1 60 .rlevel QUIT
  .timer -o 1 60 unset %split.*
}
alias kernel.echosplit {
  echo $colour(info2) %split.chan $timestamp Netsplit Flood Detected and Blocked at:
  echo $colour(info2) %split.chan $timestamp $kernel.echospcl($2 -- $3)
  echo $colour(info2) %split.chan $timestamp $kernel.echospcl($1) $kernel.echousers(%split.users) $kernel.echosplitchan(%split.chan)
  .timer -o 1 6 unset %split.*
}
alias kernel.echospcl { return  $+ $colour(info) $+ ( $+ $1 $+  $+ $colour(info) $+ ) }
alias kernel.echousers { return  $+ $colour(info) $+ ( $+ $1 $+  $+ $colour(info) Users) }
alias kernel.echosplitchan { return  $+ $colour(info) $+ ( $+ $1 $+  $+ $colour(info) $+ ) }