printing over ppp link

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From - Sat Dec 23 06:06:09 2000
Message-ID: <3A44088D.A237DEF7@idealgroup.com> 
Date: Fri, 22 Dec 2000 18:06:05 -0800
From: Darryl Krasman <darryl@idealgroup.com>
Organization: Ideal Computer Group Inc.
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Subject: Re: HP Print servers over PPP connection
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Steve Fabac wrote:
> 
> 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
> 

I get along fine from home to/from work via ppp without the need for a
third network for ppp. You'll need to add "proxy" to the ppp
configuration (SCO PPP). For example, work is 192.168.1. & home is
192.168.37. :

home side:
# grep icg /etc/ppphosts
icg-thor:thor-icg uucp=icgppp accm=0 mask=255.255.255.0 filter=thor
flow=rtsc
ts proxy mru=1536
*ideacom local=thor-icg remote=icg-thor accm=0 filter=thor flow=rtscts
proxy
mru=1536
# ifconfig ppp0
ppp0: flags=4071<UP,POINTOPOINT,WANTIOCTLS,RUNNING,MULTICAST> mtu 1536
        inet 192.168.37.9 --> 192.168.1.181 netmask ffffff00
        perf. params: recv size: 32768; send size: 32768; full-size
frames: 1
Routing tables
Destination      Gateway            Flags    Refs      Use  Interface
default          192.168.1.181      UGS         8    76594  ppp0

work side:
# grep thor /etc/ppphosts
*thor local=icg-thor filter=default remote=thor-icg accm=0 idle=2
flow=rtscts mru=
1536
thor-icg:icg-thor filter=default uucp=thorppp retry=0 accm=0
mask=255.255.255.0 id
le=2 flow=rtscts mru=1536
# /etc/ifconfig ppp0
ppp0: flags=4071<UP,POINTOPOINT,WANTIOCTLS,RUNNING,MULTICAST> mtu 1536
        inet 192.168.1.181 --> 192.168.37.9 netmask ffffff00
        perf. params: recv size: 32768; send size: 32768; full-size
frames: 1
Routing tables
Destination      Gateway            Flags    Refs      Use  Interface
192.168.37       192.168.37.9       UGS         0    17419  ppp0
192.168.37.9     192.168.1.181      UH          3   591307  ppp0

>From home I can ping every PC, printer, diskless workstation
(www.ltsp.org) or ethernet terminal at work and from work, everything at
home.
-- 
Darryl
Ideal Computer Group Inc.

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