04-11-2011
Path MTU Discovery is nice on a varied intranet, but not so good for the Internet, where the short relationships might make it not worth the effort.
Use a sniffer to see what sort of options are in your standard TCP packets (not SYN or FIN). Add their length to the 40 before subtracting. Sometimes, the RWIN is called max MSS. Try various options with a long stream between two local hosts.
Normally, frags are for big UDP packets and normal-net-max packets on VPN.
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LEARN ABOUT NETBSD
rpc.bootparamd
RPC.BOOTPARAMD(8) BSD System Manager's Manual RPC.BOOTPARAMD(8)
NAME
bootparamd, rpc.bootparamd -- boot parameter server
SYNOPSIS
bootparamd [-ds] [-i interface] [-r router] [-f file]
DESCRIPTION
bootparamd is a server process that provides information to diskless clients necessary for booting. It consults the file ``/etc/bootparams''.
It should normally be started from ``/etc/rc''.
This version will allow the use of aliases on the hostname in the ``/etc/bootparams'' file. The hostname returned in response to the booting
client's whoami request will be the name that appears in the config file, not the canonical name. In this way you can keep the answer short
enough so that machines that cannot handle long hostnames won't fail during boot.
While parsing, if a line containing just ``+'' is found, and the YP subsystem is active, the YP map bootparams will be searched immediately.
OPTIONS
-d Display the debugging information. The daemon does not fork in this case.
-i interface
Specify the interface to become the default router. bootparamd picks the first IPv4 address it finds on the system by default. With
-i, you can control which interface to be used to obtain the default router address. -r overrides -i.
-s Log the debugging information with syslog(3).
-r Set the default router (a hostname or IP-address). This defaults to the machine running the server.
-f Specify the file to use as boot parameter file instead of ``/etc/bootparams''.
FILES
/etc/bootparams default configuration file
SEE ALSO
bootparams(5)
AUTHORS
Originally written by Klas Heggemann <klas@nada.kth.se>.
BUGS
You may find the syslog messages too verbose.
It's not clear if the non-canonical hack mentioned above is a good idea.
BSD
January 8, 1994 BSD