HP3000-L Archives

June 2001, Week 3

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Subject:
Network Gateway Redirects
From:
Patrick Santucci <[log in to unmask]>
Reply To:
Patrick Santucci <[log in to unmask]>
Date:
Wed, 20 Jun 2001 13:16:47 -0400
Content-Type:
text/plain
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text/plain (51 lines) 
I have another question for you network gurus. :-)

Is there any way to tell our 3000 to ignore gateway redirect messages? We
have two routers, one for our WAN and one for the Internet. Only the WAN
router is configured on our HP3000 systems.

When our WAN router (172.18.0.20) loses connectivity with the router at the
other end of the connection, it tries to reroute the packets through the
Internet router (172.18.1.80). At the same time, it sends a "gateway
redirect" message to the system the packets originated from, telling the
3000 to send future requests bound for that destination to the 1.80 router.
Since these packets should *only* be going over the WAN router, this is
*incorrect*. However, the HP system doesn't know that and happily complies
with the request. This happens even though the 1.80 router is *not*
configured on the HP system at all... It just suddenly appears, as can be
seen in NETTOOL when I do a GATELIST:

[3]NAMEADDR.ROUTING>>>gatel
    Network address filter: @
    Gateway address filter: @

Gateway IP        Hops     Flags    Active    Default Gateway
______________________________________________________________
172.18.0.20        21       0          y           y
172.18.1.80         0       0          y           n
______________________________________________________________

Total number of gateways = 2
[4]NAMEADDR.ROUTING>>>

When the connection is again established over the 0.20 (WAN) router, there
is *no* redirect message sent telling the HP system to send its packets over
the WAN router, and I have to manually disable the 1.80 router by doing
GATEDOWN 172.18.1.80 in NETTOOL in order to reestablish a connection.

My current workaround is to run a modified version of Beechglen's GATEUP
job, basically doing the opposite, taking the active gateway down if it's
up, but it would be better if it wasn't necessary.

Any ideas, suggestions, comments are welcome.

Thanks,
Patrick
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Patrick Santucci
HP e3000 Systems Administrator
Cornerstone Brands, Inc.

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