Solaris 11 Express NAT/Router IP Fragments Post: 302511918

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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

04-08-2011

Registered User

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?

vectox

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LEARN ABOUT FREEBSD

bootparamd

BOOTPARAMD(8)						    BSD System Manager's Manual 					     BOOTPARAMD(8)

NAME

     bootparamd -- boot parameter server

SYNOPSIS

     bootparamd [-ds] [-r router] [-f file]

DESCRIPTION

     The bootparamd utility is a server process that provides information to diskless(8) clients necessary for booting.  It consults the
     /etc/bootparams file.

     This version will allow the use of aliases on the hostname in the /etc/bootparams file.  The returned hostname to the whoami request done by
     the booting client will be the name that appears in /etc/bootparams and not the canonical name.  In this way you can keep the answer short
     enough so that machines that cannot handle long hostnames will not fail during boot.

OPTIONS

     -d 	 Display the debugging information.

     -s 	 Log the debugging information with syslog(3).

     -r router	 The default router (a machine or an IP-address).  This defaults to the machine running the server.

     -f file	 The file to use as boot parameter file instead of /etc/bootparams.

FILES

     /etc/bootparams  default boot parameter file

EXAMPLES

     When netbooting diskless SunOS/Xkernel SPARCstations the booted SunOS kernel also broadcasts to the all-0 address.  The SunOS kernel hangs
     until it receives a reply.  To accommodate this behaviour add an alias address that responds to an all-0 broadcast.  So, add something like
     'ifconfig xl0 192.168.200.254 netmask 255.255.255.255 broadcast 192.168.200.0 alias' on the relevant network interface on your bootparamd
     server.  The alias address must of course be free for use.

SEE ALSO

     syslog(3), bootparams(5), diskless(8)

AUTHORS

     Written by Klas Heggemann <klas@nada.kth.se>.

BUGS

     You may find the syslog(3) loggings to be verbose.

BSD
								 December 14, 2000							       BSD