Re: CSLIP / TCP/IP Guru Needed

[Nils Rennebarth <nils@nus.de>]

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On Sat, 19 Apr 1997, Kevin Traas wrote:
>Here's my current configuration:
>
><---A--->1<---B--->2<---C--->
>
>A is the IP subnet of my ISP
>B is an IP subnet for a CSLIP link between 1 and 2
>C is the IP subnet of my LAN
>1 is my internet "gateway" - running Debian
>2 is my internet "router" - running Debian

>I once read/heard somewhere that it might be possible to do unnumbered
>CSLIP interfaces.  Is this possible?  If so, how do I do it?  (Pointers to
>manual/docs gladly accepted....)  
"Unnumbered interfaces" (this is Cisco's terminology if I am right) are
Point-to-Point interfaces under Linux.

If I understood you right, 1 is attached to your ISP by Ethernet, so let's
assume it's eth0 interface is configured like this:
  ifconfig eth0 192.168.1.2 netmask 255.255.255.0 broadcast 192.168.1.255
  route add -net 192.168.1.0
  route add default gw 192.168.1.1

Your LAN has it's own Class C subnet, say eth0 on 2 is configured like
this:
  ifconfig eth0 192.168.99.2 netmask 255.255.255.0 broadcast 192.168.99.255
  route add -net 192.168.99.0

In short, your ISP's local net is Class C 192.168.1.0 and your own LAN
has Class C subnet 192.168.99.0

Then you simply have to make the CSLIP (why don't you use PPP?)
as a Point-to-Point Interface between 192.168.1.2 and 192.168.99.1,
and after 2 sets up the CSLIP interface, it needs to add a default route
through it by
   route add default dev sl0

and on 1 you need to give the command
   route add -net 192.168.99.0 netmask 255.255.255.0 dev sl0

(sl0 is the interface name of the slip interface, if memory serves
correctly.)

If you used PPP, this should be put in /etc/ppp/ip-up (and you could
further increase your bandwidth by using software compression on both
sides.)

Nils

- -- 
     \              /                        | Nils Rennebarth
    --* WINDOWS 42 *--                       | Schillerstr. 61 
     /              \                        | 37083 Göttingen
                                             | ++49-551-71626
   Micro$oft's final answer                  | http://www.nus.de/~nils

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