[NCLUG] I'm wearing my ball and ipchains. Please help.

[John Baughman]

I found a script in a book, "Linux Firewalls", that might work, if you need 
it, or want it for ref, let me know. It isn't perfect, but it does get a 
small LAN up and running through a firewall with masq.

-John Baughman


>From: Bill Thorson <thorson at typhoon.atmos.colostate.edu>
>Reply-To: nclug at nclug.org
>To: nclug at nclug.org
>Subject: [NCLUG] I'm wearing my ball and ipchains.  Please help.
>Date: Mon, 19 Feb 2001 23:45:20 -0700 (MST)
>
>
>I cannot seem to figure out the right ipchains lines to get this
>masquerading working.  I only have a wee dialup feed but am trying
>to share it with some other computers in my house.  My computer is
>running Redhat 7 and has two ethernet cards and one is wireless.
>There is a Linksys router being used as a hub [H] stuck in there
>with address 192.168.1.1.
>
>                                                 +----+
>                                    192.168.1.3  |    |
>                                   +-------------|PC1 |
>                                  [H]            |Win |
>            +----+  192.168.1.2    |             |    |
>            |    |-----------------+             +----+
>       ppp0 |    | eth0 (100baseT)
>      ------|PC0 |
>            |RH7 | eth1 (wireless)
>            |    |-----------------+             +----+
>            +----+  192.168.2.1    |             |    |
>                                   | 192.168.2.2 |PC2 |
>                                   +-------------|RH7 |
>                                                 |    |
>                                                 +----+
>
>I can get PC2 working fine through PC0 to the Internet but cannot get
>PC1 working.  PC1 has no trouble communicating with PC0.  Also PC2
>cannot ping PC1 and visa versa even though PC0 can ping anybody and
>anybody can ping PC0.  ifconfig and route table are below.
>
>Can anybody help me?  I've tried everything I can think of.
>
>Bill
>
>------------------------------------------------------------------
>eth0      Link encap:Ethernet  HWaddr 00:A0:24:82:CD:86
>           inet addr:192.168.1.2  Bcast:192.168.1.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:2431 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:100
>           Interrupt:10 Base address:0x300
>
>eth1      Link encap:Ethernet  HWaddr 00:00:F1:11:73:F7
>           inet addr:192.168.2.1  Bcast:192.168.2.255  Mask:255.255.255.0
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:25382 errors:0 dropped:0 overruns:0 frame:1024
>           TX packets:27641 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:100
>           Interrupt:3
>
>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:6111 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:6111 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>
>ppp0      Link encap:Point-to-Point Protocol
>           inet addr:999.99.999.99  P-t-P:999.99.999.999  
>Mask:255.255.255.255
>           UP POINTOPOINT RUNNING NOARP MULTICAST  MTU:1500  Metric:1
>           RX packets:16434 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:15936 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:10
>
>
>------------------------------------------------------------------
>Destination     Gateway         Genmask         Flags   MSS Window  irtt 
>Iface
>999.99.999.999  0.0.0.0         255.255.255.255 UH        0 0          0 
>ppp0
>192.168.2.0     0.0.0.0         255.255.255.0   U         0 0          0 
>eth1
>192.168.1.0     0.0.0.0         255.255.255.0   U         0 0          0 
>eth0
>127.0.0.0       0.0.0.0         255.0.0.0       U         0 0          0 lo
>0.0.0.0         999.99.999.999  0.0.0.0         UG        0 0          0 
>ppp0
>
>
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