04-08-2011
Solaris 11 Express NAT/Router IP Fragments
Upon replacing my linux router/server with a Solaris one I've noticed very poor network performance. The server itself has no issues connecting to the net, but clients using the server as a router are getting a lot of IP fragments as indicated from some packet sniffing I conducted.
Here was my old setup.
<DSL_Modem>-<Linux Router>-<switch>-<wifi>-<macbook>
- this setup works fine, with no fragmentation or performance issues
Setup 1
<DSL_Modem>-<Sol 11 Router>-<switch>-<wifi>-<macbook>
- this setup has major packet fragmentation
Setup 2 (taking wifi out of the flow)
<DSL_Modem>-<Sol 11 Router>-<switch>-<macbook>
- this setup has major packet fragmentation
I played with various MTU settings on the solaris server internal NIC, but it made no difference so I tried a couple of things with the client box.
I determined the max MTU I could send from my macbook as 1464 without getting fragmentation by using:
ping -D -s 1464 <any internet ip>
Once I manually set my MTU down to 1464 on my macbook instead of the default 1500 web pages started loading normally. So here's the problem...why do I have to manually set the MTU on the client macbook when I have my solaris server setup as a router. Is there some network related tuning I can perform on the server that will address these issues?
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LEARN ABOUT DEBIAN
setupcon
SETUPCON(1) Console-setup User's Manual SETUPCON(1)
NAME
setupcon - sets up the font and the keyboard on the console
SYNOPSIS
setupcon [OPTION]... [VARIANT]
DESCRIPTION
setupcon is a program for fast and easy setup of the font and the keyboard on the console. Most of the time you invoke setupcon without
arguments. The keyboard configuration is specified in ~/.keyboard or /etc/default/keyboard. The font configuration is specified in
~/.console-setup or /etc/default/console-setup. Consult keyboard(5) and console-setup(5) for instructions how to configure these two
files.
If you have to switch often between different encodings, keyboards or languages, you can prepare several alternative configuration files
for setupcon. Suppose that most of the time you will use Greek language with Greek keyboard layout, but sometimes you need to type in Ger-
man with German keyboard layout. In this situation you should customize the main configuration files (keyboard and console-setup) for
Greek. Create also alternative configuration files for German named keyboard.german and console-setup.german. Then in order to configure
the console for Greek you will simply run the command with no arguments: setupcon and in order to configure the console for German you will
use setupcon german.
OPTIONS
-v, --verbose
Be more verbose. Use this option if something goes wrong or while experimenting with the configuration files.
-k, --keyboard-only
Setup the keyboard only, do not setup the font.
-f, --font-only
Setup the font only, do not setup the keyboard.
--force
Do not check whether we are on the console. Notice that you can be forced to hard-reboot your computer if you run setupcon with
this option and the screen is controlled by a X server.
--save This option can be useful if you want to use setupcon early in the boot process while /usr is not yet mounted and the required data
are not available. This option will make setupcon copy the required files in /etc/console-setup/ in order to make them available
before /usr is mounted. If you use setupcon early in the boot process, then you should run it with this option after every change
of the console configuration.
--save-only
The same as --save, but does not setup the keyboard and the font. This option can be useful if you want to save the required files
while the screen is controlled by a X server.
-h, --help
Display usage information.
VARIANT
Specifies which configuration file to use. By default the configuration files of setupcon are named console-setup and keyboard but
if you use e.g. chukchi as VARIANT then the configuration files will be console-setup.chukchi and keyboard.chukchi. In this way
you can have easy access to several different configurations - for example one for the Chukchi language and another for the default
configuration.
FILES
~/.console-setup
~/.keyboard
/etc/default/console-setup
/etc/default/keyboard
/etc/default/console-setup.VARIANT
/etc/default/keyboard.VARIANT
/etc/console-setup/
SEE ALSO
keyboard(5), console-setup(5)
console-setup 2011-03-17 SETUPCON(1)