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I have asked the list before about this routing problem but apparently
didn't give enough info for you folks to understand the situation.  So here
goes again.  (Sorry it's so wordy.)

I have a box (kernel 2.2.14) setup to provide a single line ppp dial-up to
make connection to our campus network.  (So I can connect to the campus net
from home without going thru an ISP)  It worked very well until I installed
IP Masq.  With IP Masq it routes to/from everything on the internet OK but
does not route to the campus subnet that the linux box is on.  (I can no
longer ping the subnet the box is on but I can still ping everything else.)
 I assume there must be a very simple answer as to why this happens.

The box has two NIC's and a modem:
eth0 interfaces to the campus net with a static IP (134.139.180.73)
eth1 interfaces to a local private net (192.168.0.x)
The modem accepts incoming ppp.
 
                       ---------



                                                            |
|      |         | <--> [dial-up ppp line]  
[campus network] <-->  linux box
|              |      |         | <--> [private network]
                       ---------

With IP Masq all the machines on the private net (192.168.0.x) can see
everything on the campus net and beyond, no problem.

Here is what I have in my rc.firewall:
#!/bin/sh
#
/sbin/depmod -a
/sbin/modprobe ip_masq_ftp
/sbin/modprobe ip_masq_raudio
/sbin/ipchains -M -S 7200 10 160
/sbin/ipchains -P forward DENY
/sbin/ipchains -A forward -s 192.168.0.0/24 -j MASQ
#

My routing table looks like this:
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.10    *               255.255.255.255 UH    0      0        0 ppp0
192.168.0.0     *               255.255.255.0   U     0      0        0 eth1
134.139.180.0   *               255.255.255.0   U     0      0        0 eth0
loopback        *               255.0.0.0       U     0      0        0 lo
default         134.139.180.1   0.0.0.0         UG    1      0        0 eth0

My options.ttyS1 file has:
   192.168.0.1:192.168.0.10

And ifconfig gives:
eth0      Link encap:Ethernet  HWaddr 00:A0:24:3B:95:30  
          inet addr:134.139.180.73  Bcast:134.139.180.255  Mask:255.255.255.0

eth1      Link encap:Ethernet  HWaddr 00:00:C0:77:B0:48  
          inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
          
lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          
ppp0      Link encap:Point-to-Point Protocol  
          inet addr:192.168.0.1  P-t-P:192.168.0.10  Mask:255.255.255.255
          
Any help most appreciated.

Thanks






--

Bob Soukup
WWWeb http://www.csulb.edu/~rsoukup

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