My question is :
Hi. I have some trouble with setting up the gateway. So I ask your help.
We have 30 new SUN workstations and will connect them to the our school's LAN.
So I have the plan to make one of 30 machines a gateway.
Our school network is 163.239.0.0 and new subnetwork for 30 new machines is
163.239.150.0. And the gateway has two ip addresses - 163.239.150.210 and
163.239.130.41. le0(163.239.150.210) is connected to hub to which all other
new machine is connected. le1(163.239.130.41) is connected to hub through
which the gateway can reach school's LAN.
First the summary of my environment follows :
gateway hub
hub 163.239.130.41 ----
---- |--| | |-----
| |---------------|__|-------------| | |--|
---------| | 163.239.150.210 | |---------|__|
to our | | ---- 163.239.150.212
school's | |-------------------------------------
LAN ---- |
| 163.239.130.50
|--|
|__|
* I run SunOS 4.1.3 on all machines.
* At gateway, I can 'telnet 163.239.150.212' and also 'telnet 163.239.130.50'.
* But at 163.239.150.212, I can't 'telnet 163.239.130.50' and at 163.239.130.
50, can't 'telnet 163.239.150.212'.
* Therefore I supposed that the gateway failed to do ip-forwarding.
That is true :
gateway $ netstat -s
.
.
0 packets forwarded
5001 packets not forwardable
.
.
So I checked the kernel variable, ip-forwarding, but it is set to 1.
gateway $ adb -k -w /vmunix /dev/mem
ip_forwarding?
ip_forwarding 10000
* And then check the routing tables and netmasks :
gateway $ cat /etc/netmasks
163.239 255.255.255.0
1. Routing table of gateway :
Dest Gateway Flags Interface
127.0.0.1 127.0.0.1 UH lo0
163.239.130.0 163.239.130.41 U le1
163.239.150.0 163.239.150.210 U le0
(These is set by routed(?) when booting)
2. Routing table of one of other machines, 163.239.150.212 :
Dest Gateway Flags Interface
127.0.0.1 127.0.0.1 UH lo0
163.239.130.0 163.239.150.210 UG le0
163.239.150.0 163.239.150.212 U le0
3. Netmask of each interfaces of each machines?
IP address netmasks
163.239.150.210 255.255.255.0 - le0 of the gateway
163.239.130.41 255.255.255.0 - le1 of the gateway
163.239.150.211 255.255.255.0
163.239.150.212 255.255.255.0
. .
. .
* And 2 interfaces are up :
gateway $ ifconfig -a
le0: flags=63<UP,BROADCAST,NOTRAILERS,RUNNING>
inet 163.239.150.210 netmask ffffff00 broadcast 163.239.150.0
le1: flags=63<UP,BROADCAST,NOTRAILERS,RUNNING>
inet 163.239.130.41 netmask ffffff00 broadcast 163.239.130.0
lo0: flags=49<UP,LOOPBACK,RUNNING>
inet 127.0.0.1 netmask ff000000
Why the gateway does not forward packets ?
What is wrong?
The answer is :
I shoud have had the following routing entry in 163.239.130.50.
Dest Gateway Flags Interface
127.0.0.1 127.0.0.1 UH lo0
163.239.130.0 163.239.130.50 U le0
* 163.239.150.0 163.239.130.41 UG le0
The problem is in 163.239.130.0 network.
Thanks to all who responded :
Robert Sessions <robert@pwl-sparc2.pwl.com>
Venkata Ramakrishn <ramu@duettech.com>
John Justin Hough <john@oncology.uthscsa.edu>
Cheryl L. Southard <cld@astro.caltech.edu>
Bismark Espinoza <bismark@alta.jpl.nasa.gov>
Good day Everyone !!!
-------------------------------------
E-mail : heo@cslsun10.sogang.ac.kr
This archive was generated by hypermail 2.1.2 : Fri Sep 28 2001 - 23:10:54 CDT