routing table anamolies

From: Shiraz Baig (shiraz_baig_at_yahoo.com)
Date: 03/30/05

  • Next message: Alakendu Jana: "RE: Can't play mp3 files, in XMMS in Red Hat 9.0" 
    Date: Wed, 30 Mar 2005 00:05:45 -0800 (PST)
To: redhat <redhat-list@redhat.com>

    Now, here is a real problem.
    We have 6 IP addresses. 203.147.165.112 to 119 with
    netmask 255.255.255.248
    We have used three. One for the mail server and one
    for the DSL router and one for proxy server.

       Switch
     _______________
     | | | | | |
     | | | | | ---- DSL Router ---- Internet
     | | | | | 203.147.175.113
     | | | | |
     | | | | ------- Proxy Server (multihomed)
     | | | | 203.147.165.114
     | | | | 192.168.10.4
     | | | |
     | | | ----------Mail Server (multihomed)
     | | | 203.147.175.116
     | | | 192.168.10.3
     | | |
     | | -------- 192.168.10.5 (A) Linux machine
     | ----------- 192.168.10.6 (B) windows machine
     ---------------- Hub & computers of address
                       192.168.10.*

    My Linux Machine shown as (A) in the diagram cannot
    connect to the internet. In fact, it does not even
    ping to DSL Router 203.147.175.113
    On another windows macine (192.168.10.6) it
    is happily accessing Internet thru proxy server.

    Here is my routing table on Linux Machine.

    Kernel IP routing table
    Destination Gateway Genmask Flags MSS S
                                Window irtt Iface
    203.147.175.112 0.0.0.0 255.255.255.248 U 0
                                   0 0 eth0
    192.168.10.0 0.0.0.0 255.255.255.0 U 0
                                   0 0 eth0
    169.254.0.0 0.0.0.0 255.255.0.0 U 0
                                   0 0 eth0
    127.0.0.0 0.0.0.0 255.0.0.0 U 0
                                   0 0 lo
    0.0.0.0 203.147.175.113 0.0.0.0 UG 0
                                   0 0 eth0

    What is wrong with this table, and why can I not ping
    203.147.175.113.
    I have done "echo 1 > /proc/sys/net/ipv4/ip_forward
    I have also set proxy as 192.168.10.4.
    By the way, I comapred this table with
    mail server (192.168.10.3) routing table. And it
    resembles it competely. From othe mail server I can
    ping DSL router (113). But from Linux Machine
    I cannot do so.
    Any suggestions?

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