(IPTables) old dog needs some help with a dual-homed debian (woody) system

From: U. Sarma Seetamraju (sarma_at_bellatlantic.net)
Date: 10/16/03

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    Date: 16 Oct 2003 14:44:58 -0700

    (N) WIRELESS (H) ETHERNET (x)
    Notebook <----> linux-dev <-----> linux-fs
    w/ wireless w/ wireless IP 10.0.2.1 ethernet
    card IP: 10.0.2.2 & ethernet IP 10.0.1.12 IP 10.0.1.9

    NOTE: THERE ARE NO wireless HUBS (that stuff that we can buy at
    stores).

    The last machine (x) is ONE sample machine on the ethernet hub, I
    picked it to explain my problem better.

    (N) can ping (H) and vice versa. ANd ofcourse, the ethernet network
    has been working for a while now.

    But (N) cannot PING anything other than (H) and (N)'s IP is assigned
    manually.
    (N) is a windows PC with netmask set to 255.255.0.0 and the gateway
    to 10.0.1.1
    And yes, the OTHER machines can ping each other quite well over
    othernet (10.0.1.x).

    I tried all possible combinations of netmasks, but no luck.
    In my youth :-) I used to tell IPCHAINS to ' -j FORWARD ' and that
    would (I think) have done the job...

    Please let me know what I neeed to do.

    Thanks in advance...

    Sarma

    [root@linuxdev init.d]# uname -a
    Linux linuxdev.localdomain 2.4.16-k6 #1 Wed Nov 28 10:34:08 EST 2001
    i586 unknown

    [root@linuxdev ~]# iptables -L
    Chain INPUT (policy ACCEPT)
    target prot opt source destination
    ACCEPT all -- anywhere anywhere

    Chain FORWARD (policy ACCEPT)
    target prot opt source destination
    ACCEPT all -- anywhere anywhere

    Chain OUTPUT (policy ACCEPT)
    target prot opt source destination
    ACCEPT all -- anywhere anywhere

    [root@linuxdev ~]# route -n
    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref
    Use Iface
    10.0.2.1 0.0.0.0 255.255.255.255 UH 0 0
    0 eth1
    10.0.2.0 0.0.0.0 255.255.255.0 U 0 0
    0 eth1
    10.0.1.0 0.0.0.0 255.255.255.0 U 0 0
    0 eth0
    0.0.0.0 10.0.1.1 0.0.0.0 UG 0 0
    0 eth0
    [root@linuxdev ~]#

    [root@linuxdev ~]# ifconfig
    eth0 Link encap:Ethernet HWaddr 00:48:54:1C:30:CF
              inet addr:10.0.1.12 Bcast:10.0.1.255 Mask:255.255.255.0
              UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
              RX packets:155489 errors:0 dropped:0 overruns:0 frame:0
              TX packets:127575 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:100
              RX bytes:16425790 (15.6 MiB) TX bytes:15916255 (15.1 MiB)
              Interrupt:11 Base address:0xa000

    eth1 Link encap:Ethernet HWaddr 00:00:F1:11:73:8D
              inet addr:10.0.2.1 Bcast:10.0.2.255 Mask:255.255.255.0
              UP BROADCAST RUNNING MULTICAST MTU:1400 Metric:1
              RX packets:3863 errors:0 dropped:0 overruns:0 frame:0
              TX packets:2274 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:100
              RX bytes:332766 (324.9 KiB) TX bytes:272377 (265.9 KiB)
              Interrupt:3

    lo Link encap:Local Loopback
              inet addr:127.0.0.1 Mask:255.0.0.0
              UP LOOPBACK RUNNING MTU:16436 Metric:1
              RX packets:693 errors:0 dropped:0 overruns:0 frame:0
              TX packets:693 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0
              RX bytes:46335 (45.2 KiB) TX bytes:46335 (45.2 KiB)

    =====================================
    Below is the IFCONFIG on the machine (x), just in case the cause of
    the problem is here ....
    =====================================

    [root@linuxfs inet]# ifconfig
    eth0 Link encap:Ethernet HWaddr 00:0A:E6:16:CD:3C
              inet addr:10.0.1.9 Bcast:10.0.255.255 Mask:255.255.0.0
              UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
              RX packets:5200126 errors:0 dropped:0 overruns:0 frame:0
              TX packets:22054147 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:100
              RX bytes:559561516 (533.6 MiB) TX bytes:3671206402 (3.4
    GiB)
              Interrupt:5 Base address:0xcc00

    lo Link encap:Local Loopback
              inet addr:127.0.0.1 Mask:255.0.0.0
              UP LOOPBACK RUNNING MTU:16436 Metric:1
              RX packets:9613 errors:0 dropped:0 overruns:0 frame:0
              TX packets:9613 errors:0 dropped:0 overruns:0 carrier:0
              collisions:0 txqueuelen:0
              RX bytes:1482431 (1.4 MiB) TX bytes:1482431 (1.4 MiB)

    [root@linuxfs inet]# route -n
    Kernel IP routing table
    Destination Gateway Genmask Flags Metric Ref
    Use Iface
    10.0.0.0 0.0.0.0 255.255.0.0 U 0 0
    0 eth0
    0.0.0.0 10.0.1.1 0.0.0.0 UG 0 0
    0 eth0
    [root@linuxfs inet]#

    [End]

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