IP masquerade question

[Brian A Bucher <babucher MIT EDU>]

Greetings again,

I'm trying to use my linux box to perform IP-masquerading
and firewalling.  So far I haven't had much luck in even
getting the basics to work.  I've been trying to get the
multiple-interfaces setup going, but no luck.

The linux box is presently connected to the net using
eth0 at 204.167.104.162 through a router 204.167.104.161

I'm trying to get eth1 set up at 192.168.0.1, to use as
a gateway for a local MASQ'd network.  

I have a test Win98 PC with settings:
IP      192.168.0.100
Gateway 192.168.0.1
Netmask 255.255.255.0

I have the network card of the test PC connected (with RJ45 cable)
to the eth1 network card in the linux box.  
The test PC can ping itself (.100), but it can't ping 192.168.0.1
I also can't ping the PC from the linux box.

I've been trying to RTFM as much as possible, but it's time to
stop and ask for directions. :)

Any suggestions would be appreciated!

Thanks,
Brian



Here are the relevant files (that I know of) for this setup:

--------------------------------------------------------------
/etc/sysconfig/network

[root /etc/sysconfig]# more network
NETWORKING=yes
FORWARD_IPV4="no"
HOSTNAME="npisrv1.n-p-i.net"
DOMAINNAME="n-p-i.net"
GATEWAY="204.167.104.161"
GATEWAYDEV="eth0"
IPX="no"
IPXINTERNALNETNUM="0"
IPXINTERNALNODENUM="0"
IPXAUTOPRIMARY="on"
IPXAUTOFRAME="on"
NISDOMAIN=""
[root /etc/sysconfig]# 
--------------------------------------------------------------
/etc/sysconfig/network-scripts/ifcfg-eth0

[root /etc/sysconfig/network-scripts]# more ifcfg-eth0
DEVICE="eth0"
IPADDR="204.167.104.162"
NETMASK="255.255.255.224"
ONBOOT="yes"
BOOTPROTO="none"
IPXNETNUM_802_2=""
IPXPRIMARY_802_2="no"
IPXACTIVE_802_2="no"
IPXNETNUM_802_3=""
IPXPRIMARY_802_3="no"
IPXACTIVE_802_3="no"
IPXNETNUM_ETHERII=""
IPXPRIMARY_ETHERII="no"
IPXACTIVE_ETHERII="no"
IPXNETNUM_SNAP=""
IPXPRIMARY_SNAP="no"
IPXACTIVE_SNAP="no"
[root /etc/sysconfig/network-scripts]# 

--------------------------------------------------------------
/etc/sysconfig/network-scripts/ifcfg-eth1

[root /etc/sysconfig/network-scripts]# more ifcfg-eth1
DEVICE="eth1"
IPADDR="192.168.0.1"
NETMASK="255.255.255.0"
ONBOOT="yes"
BOOTPROTO="none"
IPXNETNUM_802_2=""
IPXPRIMARY_802_2="no"
IPXACTIVE_802_2="no"
IPXNETNUM_802_3=""
IPXPRIMARY_802_3="no"
IPXACTIVE_802_3="no"
IPXNETNUM_ETHERII=""
IPXPRIMARY_ETHERII="no"
IPXACTIVE_ETHERII="no"
IPXNETNUM_SNAP=""
IPXPRIMARY_SNAP="no"
IPXACTIVE_SNAP="no"
[root /etc/sysconfig/network-scripts]# 
--------------------------------------------------------------


Here is the output of the relevant commands:

--------------------------------------------------------------
[root ~]# /sbin/ifconfig
eth0      Link encap:Ethernet  HWaddr 00:D0:B7:1D:CE:A6  
          inet addr:204.167.104.162  Bcast:204.167.104.191  Mask:255.255.255.224
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:3555 errors:0 dropped:0 overruns:0 frame:0
          TX packets:5473 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          Interrupt:9 Base address:0xd000 

eth1      Link encap:Ethernet  HWaddr 00:D0:B7:1D:89:30  
          inet addr:192.168.0.1  Bcast:192.168.0.255  Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100 
          Interrupt:5 Base address:0xb800 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          UP LOOPBACK RUNNING  MTU:3924  Metric:1
          RX packets:4 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 

[root ~]# 
--------------------------------------------------------------
[root ~]# /sbin/route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
192.168.0.1     0.0.0.0         255.255.255.255 UH    0      0        0 eth1
204.167.104.162 0.0.0.0         255.255.255.255 UH    0      0        0 eth0
204.167.104.160 0.0.0.0         255.255.255.224 U     0      0        0 eth0
192.168.0.0     0.0.0.0         255.255.255.0   U     0      0        0 eth1
127.0.0.0       0.0.0.0         255.0.0.0       U     0      0        0 lo
0.0.0.0         204.167.104.161 0.0.0.0         UG    0      0        0 eth0
[root ~]# 

--------------------------------------------------------------