network routing ppp wan

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From: "David H. Funte" <none>
Newsgroups: comp.unix.sco.misc
Subject: Re: Routing table question
Date: Wed, 9 Aug 2000 09:04:24 -0500
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----- Original Message -----
From: Steve Fabac <smfabac@worldnet.att.net>
Newsgroups: comp.unix.sco.misc
Sent: Tuesday, August 08, 2000 4:47 PM
Subject: Re: Routing table question

> David H. Funte wrote:
> >
> > Once upon a time, there were two SCO 5.04 servers that were connected
via
> > PPP....
> >
> > The only way I can get both systems to have full access to the other
> > server's IP addresses is to
> >
> >             (1) delete the entire routing table
> >             (2) reenter the routing table from scratch.
> >
> > I have a shell script that takes the standard output of the
"netstat -rn"
> > command, and then deletes all routes.
> >
> > Then the routes are specified.
> >
> > For example:
> >
> > The two systems are 192.168.2.x and 192.168.3.x
> > Both servers have a subnet mask of 255.255.0.0
> >
> > The PPP connection is from 2.1 to 3.1
> > The NIC card in both systems are at 2.10 and 3.10
> >
> > After deleting the routes. I use the following commands to rebuild the
> > table:
> >
> > Run from the 192.168.3 system:
> >
> > route add 192.168.0.0 192.168.3.10
> > route add 192.168.3.0 127.0.0.1
> > route add 192.168.3.1 127.0.0.1
> > route add 192.168.3.10 127.0.0.1
> > route add -interface -netmask 255.255.0.0 192.168.2.1 192.168.3.1
> > route add -netmask 255.255.0.0 192.168.2.0 192.168.2.1
> >
> > The reason (I believe) that I have to make this change is that the
default
> > route table is too stupid to know that PPP is in the middle. SO...Even
> > though each server is part of the same subnet...I have to teach it to
use
> > the PPP interface  by using "route add -interface" as in line #5 above.
> > The route table then shows that the 2.1 to 3.1 connection is ppp0 rather
> > than net0
> >
> > Question #0?: I just noticed the redundant routes from the localhost to
the
> > 192.168.3 network.   The 3.1 connection is the PPP route, the 3.10
> > connection is the NIC card.  But isn't this all covered in the statement
> > "route add 192.168.3.0 127.0.0.1"?   (I would experiment, but the system
> > the system is only free on the weekends)
> >
> > Question #1:  Even though the above changes on both systems DO WORK, I'm
> > nervous about deleting the entire routing table and reconstructing it.
Is
> > this commonly done? (BTW: after approx. 5 hours of deleting and
recreating
> > routing tables, both systems did a DOUBLE PANIC at approximately the
same
> > time.  That only added to my nervous condition.)
> --------------------------------------------------------------------------
-----------------------------------------------
> No, usually no reason to delete a routing table.
>
> I suggest that you change your ppp link to the following:
>
> LAN1 192.168.2.x
> UNIX 192.168.2.10
> PPP1 192.168.10.1 <-> PPP2 192.168.10.2
>                       UNIX 192.168.3.10
>                       LAN2 192.168.3.x
>
>
> Note that the ppp link must be a separate network (can't be the same
> as either the 192.168.2 or 192.168.3 LANS). This configuration has
> always worked for me.
>
> Is this a dedicated link? if so then the netconfig script will properly
> update the routing information for you and create a ifconfig ppp section
> in /etc/tcp so that ppp will be brought up when the machine is booted.
>
> If the connection is dial-up then you may need to run
> rout add default 192.168.10  on both unix servers after the link is up.
>
> /etc/hosts on both machines should list:
>
> 192.168.10.1 PPP1
> 192.168.10.2 PPP2
>
> use 255.255.255.0 as the netmask for all of your interfaces, including
> the PPP link.
>
> Once you have the "default" rout listed, pinging any address will work.
>

Thanks, your response makes sence.  I have (slowly) come to the conclusion
that even though the network is one network, the PPP interface forces a
split.  By putting the two servers on the same subnet mask, I've confused
the network.

A valuable lesson for the future

I haven't tried the change yet, but I will post the result.

Thanks all for your input and patience.

> >
> > Question #2:  At what point in the boot process would this change be
made.
> > After the /etc/rc2.d/S85tcp script?  I don't think I can build this
using
> > the /usr/internet/etc/sco_IP/routes file because the
/etc/rc2.d/S90iproute
> > script isn't smart enough to force the -interface connection that I
need.
> > perhaps I should create a /etc/rc2.d/S99myroutes script that deletes and
> > rebuilds the table?
> >
> > Question #3:  How likely is this change going to cause future system
admin
> > problems?  Example: anyone changing the system will be a little
surprised
> > when the old routing tables come back each time the system boots.
> >             In the past, I document special system changes by modifying
the
> > root's .profile to display a message about the changes as a reminder.
If
> > the list is too long, I reference a text file that the user can read.
This
> > takes care of the manual changes, but automated scripts won't be aware
of
> > the changes.
> >
> > Question #4: How is the default route table build.  In other words, what
> > script or program is responsible for building the bogus route table, and
> > where does it get it's data?  Perhaps I can just correct the original
data?
> >
> > Other comments, suggestion, questions, are welcome...
> >
> > PS: Thanks A.P. Lawrence for the info on your site.    I added
> >  to my bookmarks.
> >
> > David H. Funte
> >
> > --
>
>
>                                    Steve Fabac
>                                     S.M. Fabac & Associates
>                                      816/765-1670

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