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Special Forums IP Networking Solaris 11 Express NAT/Router IP Fragments Post 302511918 by vectox on Friday 8th of April 2011 12:59:20 AM
Old 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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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)
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