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Conference hydra::axp-developer

Title:Alpha Developer Support
Notice:[email protected], 800-332-4786
Moderator:HYDRA::SYSTEM
Created:Mon Jun 06 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3722
Total number of notes:11359

3442.0. "Landis & Gyr" by HYDRA::AMORELLI () Fri Apr 04 1997 13:14

    Company Name :  Landis & Gyr
    Contact Name :  Todd Doane
    Phone        :  
    Fax          :  
    Email        :  [email protected]
    Date/Time in :   4-APR-1997 12:13:30
    Entered by   :  Carl Amorelli
    SPE center   :  MRO

    Category     :  unix
    OS Version   :  V3.2G 
    System H/W   :  Alpha


    Brief Description of Problem:
    -----------------------------

     [email protected]

     We have dozens of Alpha stations here at Landis & Gyr and we do not 
     want them to do any routing.  They all have two network interface 
     cards connected to different networks.  Each network has a router with 
     multiple connections to different sites and the internet.  I have 
     configured the network to be gated with a default gateway of one of 
     the routers on one of the networks.  My question is if that interface 
     were to fail how do I establish the router on the other network as a 
     backup default gateway?  I've tried putting an additional default in 
     the routes file, but I get error 17.  I've also tried putting in a 
     -net 0.0.0.0 , which also doesn't work.  Most machines are running 
     Digital Unix V3.2G (Rev. 62).
     
     Thank you,
     
     Todd Doane
T.RTitleUserPersonal
Name
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3442.1HYDRA::AMORELLIFri Apr 04 1997 16:3111
     Todd Doane


	Are the separate networks set with separate ip subnets as well I 
don't understand why there wouldn't be a router for
each subnet/network...to change the default router  say  " route  add 
default nodeaddress "


	leo
3442.2HYDRA::AMORELLIThu Apr 10 1997 10:4851
Re[2]: Gateway's and redundant paths


Correct.  They have separate class C addresses on each interface.
The different segments each have there own router.  The problem is
that if I say "route add default nodeaddress" it just makes an entry
in the routes file that says "default nodeaddress".  So I have two
statements in the hosts file ie.:

        default 206.209.100.1   #default route for interface 1
        default 206.209.101.1   #default route for interface 2

The interface address are as follows:

        Alpha interface 1 =3D 206.209.100.2
        Alpha interface 2 =3D 206.209.101.2
        Router on 206.209.100.0 network =3D 206.209.100.1
        Router on 206.209.101.0 network =3D 206.209.101.1

Now when I stop and restart the network it will add the route
0.0.0.0 subnet mask 0.0.0.0 with next hop address of 206.209.100.1
(it doesn't give the specifics, but that is what a default route
                                                                              
looks like). Then it hits the second line and tries to add the
route 0.0.0.0 with subnet mask 0.0.0.0 with next hop address of
206.209.101.1.  At this point it says error 17 file already exists.
So, now the default route for the 206.209.100.2 interface works,
but if I unplug that cable and try to ping a distant network through
the 206.209.101.1 interface the machine doesn't recognize that the
206.209.100.0 network is down so I believe it attempts the ARP out
the 206.209.100.2 interface and then times out.  When what I'd like
to happen is that it realizes that it the first network is down so
it attempts to use the 206.209.101.0 network. Can that be done
without running the router daemon?
                                        
Do these networks meet somewhere? They shouldn't hopefully at least
not directly I understand you don't want to use the it as a router
but you do want to run gated or routed so it picks up who the latest
router is. If it knows enough to send 101 traffic out the 101.2
interface and the 100 traffic out the 100.2 interface routed or
gated takes over from there and you should need no default router.
You can try a traceroute command when one side is down to see what
its trying to do or you can enable logging under gated to see what
its trying to do and what routes are being passed..Usually, ( and this
is only in my experience) you have two networks to go to two separatelaces if
you want the two to cross you enable routing if not you
either use static routes or you enable routed or gated.

Thanks,

Todd