Re: Adding/changing TCP/IP default route

[Ken Sims <mr2087@xxxxxxxxx>]

Hi Oliver -

> We now have a new default router that I would need to configure in AS/400
> tcp/ip.  Our current default route is still valid, but doesn't know all
> subnets.
The default route doesn't have subnets, it is the route used when no
matching route can be found using subnets.  Are you sure you really mean
the default route?

> I already tried to add the new router as a second default route, but it
> doesn't work in all cases.
>
> So, can I change the origninal default route during normal operations or
> will this give problems?
I don't believe you can change the default route while TCP/IP is running,
but you can add a new default route and delete the old one.

If you only have one router, then you really only need one routing
entry.  If you have multiple interfaces defined on the AS/400, then you
might want multiple routing entries to force using different interfaces,
particularly if the different interfaces reference different network cards.

Assuming you're not trying to doing anything tricky, you need a routing
entry that is RTEDEST(*DFTROUTE) SUBNETMASK(*NONE) TOS(*NORMAL)
NEXTHOP(router-ip-address) and probably MTU(*IFC).  With that default route
in place, you should be able to delete all other routing entries.

If you do have multiple routers or multiple interfaces, you would set up a
default route as above for your primary router, then add non-default routes
as needed.  You would only want other default routes if you are specifying
the TOS as something other than *NORMAL or are specifying specific
interfaces to use.

Ken
http://www.ke9nr.net/
Opinions expressed are my own and do not necessarily represent the views of
my employer or anyone in their right mind.