-DEXTENDED_NUMERICS This option configures the server to send
extended numerics as well as parse them. This option should only
be used on networks that run ircu2.10.07 and above only.
--DFERGUSON_FLUSHER This causes your server to attempt to flush
-it's internal buffers before dropping clients during a netbreak.
-This option *may* panic your server - especially if your running
-on a unconfigured FreeBSD box. If you can define this we recommend
-you do - but beware of spontanious reboots on netbreak.
-DWALLOPS_OPER_ONLY Setting this option removes the ability for
clients that are not opered to see wallops messages.
-DNOOPER Disallow the /oper command.
host with no time conciderations. If this is enabled on a
production server I will personally drive your server into the
ground. You have been warned.
--DIPCHECKDEBUG Debugging statements with IPcheck.
Operating System and Kernel Requirements:
If you plan allowing more than 1000 clients on your server, you
set rlim_fd_max = 4096
The server will raise the soft limit to the hard limit.
+Linux 2.2 -- [Tri]/Isomer
+The kernel has a kernel destination cache size of 4096. If the kernel sees
+more than 4096 IP's in 60s it warns 'dst cache overflow'. This limit can be
+changed by modifying /proc/sys/net/ipv4/route/max_size.
+A patch to select is also recommended if you have regular poll/select
+errors.