printing over ppp link

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From: Steve Fabac <smfabac@att.net>
Organization: S.M. Fabac & Associates
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David H. Funte wrote:
> 
> I've writen about this before (months ago)  but i'm still having problems
> 
> I have two systems connected via 38k ppp
> 
> Both servers are running 5.04
> Both servers can telnet back and forth
> 
> System A is 192.168.0.1 - 255.255.255.0
> System B is 192.168.1.1 - 255.255.255.0
> 
> I have an HP 170x print server on system B. IP=192.168.1.15
> I would like to send print jobs from system A to that print server but it
> just doesn't seem to work.
> 
> When I ping from System A to the print server, I can see the Print server
> LED flash but the Ping doesn't return to the user on System A.   I've
> noticed this behaviour before with these psevers and it was solved by
> entering the Gateway address into the pserver configuration.   I tried 0.1
> and 1.1 as the Gateway and that didn't help.
> 
> Note: 0.10 and 1.10 are NICs

David,

You have made the beginners mistake with PPP connections. And it's 
easy to do as the documentation for ppp and networking is/was written
by persons who know the subject but don't know how to tell the reader
the things that they know and don't think about. 

1) Each machine should be on a separate LAN: I.E. 192.168.1.X is one
LAN. 192.168.2.X is another LAN. 

2) the PPP link between the two machines is a THIRD LAN and must have
a different network address than either of the two machine's LAN's:
PPP-machine-one: 192.168.20.1 and PPP-machine-two: 192.168.20.2.

Then your route table on machine one should have:
192.168.2        192.168.20.1        UH         10     6680  ppp0

And on machine 2:
192.168.1        192.168.20.2        ...        ...     ..... PPP0

Make sure that your print servers have the local machine's IP is set as
the "gateway" for its network, and make sure that both machines are
set to forward all packets. 

                                       Steve Fabac
                                        S.M. Fabac & Associates
                                         816/765-1670



> 
> The routint table for System A is:
> Destination      Gateway            Flags    Refs      Use  Interface
> 127.0.0.1        127.0.0.1          UH          4      527  lo0
> 192.168          192.168.0.10       UC          1        0  net0
> 192.168.0.1      127.0.0.1          UGHS        0        6  lo0
> 192.168.0.10     127.0.0.1          UGHS        1        0  lo0
> 192.168.1        192.168.1.1        UG          0        9  ppp0
> 192.168.1.1      192.168.0.1        UH         10     6680  ppp0
> 224              192.168.0.10       UCS         0        0  net0
> #
> 
> The routing table for System B is:
> Destination      Gateway            Flags    Refs      Use  Interface
> 127.0.0.1        127.0.0.1          UH          4    41053  lo0
> 192.168          192.168.1.1        UGS         0     1660  net1
> 192.168.0.1      192.168.1.1        UH          9    12520  ppp0
> 192.168.1        192.168.1.10       UC          1        0  net1
> 192.168.1.1      127.0.0.1          UGHS        1        2  lo0
> 192.168.1.10     127.0.0.1          UGHS        0      394  lo0
> 224              192.168.1.10       UCS         0        0  net1
> 
> traceroute command run on system A to 192.168.0.15 shows that it stops at
> 192.168.1.1.  I'm confused.
> 
> thanks for any input

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