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Message-ID: <3A08B05E.E72F634A@surface.ee.uh.edu>
Date: Wed, 08 Nov 2000 01:46:06 +0000
From: Qiang Xu <qxu@surface.ee.uh.edu>
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Subject: how to make a PC act as a router?
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Dear Sir/Madam:
         I have a question about how to make a PC work as a router.

         I want to setup a lab to observe TCP. The lab figure is as
following. Here is a private network.


   ---------                ---------              ---------
# |          |                  |         |                   |
|
# |    a    |<======>|    r    |<======> |    b   |
# |          |       1         |         |       2          |         |
#  ---------             ---------                 ---------
  box1.lab               router.lab                box2.lab


a,b has a NIC; r has 2 NICs,  r will work as a router.

I do something at the rc.conf. I add lab.conf at the end.
following the lab.conf file

#!/bin/sh
#---------------------------------------------
# This file initialize the network in the lab
#---------------------------------------------

case ${hostname} in
box1.lab)
     network_interfaces="ep0 lo0 vr0"
     ifconfig_vr0="inet 192.168.10.2 netmask 255.255.255.0"
     static_routes="r0"
            route_r0="net 192.168.20.0 192.168.10.1 netmask
255.255.255.0"
        ;;
router.lab)
     network_interfaces="ep0 lo0 vr0 vr1"
     ifconfig_vr0="inet 192.168.10.1 netmask 255.255.255.0"
     ifconfig_vr1="inet 192.168.20.1 netmask 255.255.255.0"
 ;;
box2.lab)
     network_interfaces="ep0 lo0 vr0"
     ifconfig_vr0="inet 192.168.20.2 netmask 255.255.255.0"
     static_routes="r0"
        route_r0="net 192.168.10.0 192.168.20.1 netmask 255.255.255.0"
        ;;
esac


I can ping itself in each PC now. but I can not ping the router from
box1 and box2, neither ping from router to box1,2.

The networkline and NICs are OK.

Could you give me some advice?


Xu, Qiang



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