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Full Discussion: Configuring 1 Nic card with 2 IP addresses and 2 seperate default Gateways in Solaris
Operating Systems Solaris Configuring 1 Nic card with 2 IP addresses and 2 seperate default Gateways in Solaris Post 302113982 by reborg on Wednesday 11th of April 2007 09:06:00 PM
Old 04-11-2007
From a routing perspective, how would you expect two default routes to work? The point of a defaut route it that if I don't know how to contact an address I ask the default router to do for me, if I have two, which one do I ask?

Solaris will allow you do so, and it is within specs but it is a very bad idea, becasue it will round-robin between the routes.

To go even further, Solaris ( prior to Solaris 10 anyway, I havn't look at this in the new stack ) would round-robin your data at the packet, not the stream, so you could have packets arriving at destination from mutiple routes which depending on the traffic may cause application issues. It is a particularly bad idea if your machine is multi-homed.

When you then add network fabric such as firewalls etc into the mix, the routing simply becomes non-deterministic. In other words it might work, it might not, or it might work for a while then stop working.

If you are looking at this from the point of view of having a backup default rout in case one fails you would be better of running a dynamic routing process.
 

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LEARN ABOUT SUSE

install-solaris

install-solaris(1M)													       install-solaris(1M)

NAME

       install-solaris - install the Solaris operating system

SYNOPSIS

       install-solaris

       install-solaris	invokes  the  Solaris  Install	program. Depending on graphical capability and available memory at the time of invocation,
       install-solaris invokes either a text-based installer or a graphical installer.

       The following minimum requirements for physical memory dictate which features are available during installation:

       For SPARC machines:

       128 MB

	   Minimum physical memory for all installation types

       128 MB

	   Minimum physical memory required for windowing system

       384 MB

	   Minimum physical memory required for graphical-based installation

       For x86 machines:

       256 MB

	   Minimum physical memory for all installation types

       256 MB

	   Minimum physical memory required for windowing system

       512 MB

	   Minimum physical memory required for graphical-based installation

       In some cases, even if the minimum physical memory is present, available virtual memory after system startup can limit the number  of  fea-
       tures available.

       install-solaris	exists	only  on  the Solaris installation media (CD or DVD) and should be invoked only from there. Refer to the  for more
       details.

       install-solaris allows installation of the operating system onto any standalone system. install-solaris loads the software available on the
       installation media. Refer to the  for disk space requirements.

       Refer to the  for more information on the various menus and selections.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcdrom  (Solaris instal-  |
       |			     |lation media)		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       pkginfo(1), install(1M), pkgadd(1M), attributes(5)

       It is advisable to exit install-solaris by means of the exit options in the install-solaris menus.

								    23 Sep 2005 					       install-solaris(1M)
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