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    SubjectVery Unusual Problem ->maybe related to IP Aliasing
    Hi,

    i have been faced with a very wiered problem. I have set up a testbed
    consisting of a 2 hosts and 1 router (all linux boxes). The router has 2
    interface cards and both have different subnet addresses and the router
    has been configured to route packets between the subnets. The 2 hosts have
    different subnet addresses and route packets to each other via the
    router(gw). They are all connected thru the same physical hub though !

    The problem is that the ping works fine from host1 to host2 but from
    host2 to host1 it only works after the arp cache in all the 3 machines
    have got updated with the hardware addresses. it doesnt work otherwise.

    could anyone have a clue what the problem could be ??

    The answer could be related to the fact that on the router one of the
    interface address that i am using for routing is configured as an alias.

    I would also appreciate if someone could point me out to any bugs that
    have been reported in IP Aliasing in kernel 2.2.2. Thanks a lot.


    Regards,
    Hormuzd.

    p.s. more details of my configuration are as follows :

    Ping works fine from 10.1.10.1 > 10.1.11.1 but does not work from
    10.1.11.1 > 10.1.10.1 "without updated arp caches".

    -------------------------------------------------------------------------
    router: eth0 -> IP address 10.1.10.2 Mask 255.255.255.0 (this is an alias
    address)
    eth1 -> IP address 10.1.11.2 Mask 255.255.255.0

    routing table :

    Destination Gateway Genmask Flags Metric Ref Use Iface
    10.1.10.0 * 255.255.255.0 U 0 0 0 eth0
    10.1.11.0 * 255.255.255.0 U 0 0 0 eth1
    -------------------------------------------------------------------------
    host1 : eth0 -> IP address 10.1.10.1 Mask 255.255.255.0

    routing table :

    Destination Gateway Genmask Flags Metric Ref Use Iface
    10.1.10.0 * 255.255.255.0 U 0 0 0 eth0
    10.1.11.0 10.1.10.2 255.255.255.0 UG 0 0 0 eth0
    -------------------------------------------------------------------------
    host2: eth0 -> IP address 10.1.11.1 Mask 255.255.255.0

    routing table :

    Destination Gateway Genmask Flags Metric Ref Use Iface

    10.1.10.0 10.1.11.2 255.255.255.0 UG 0 0 0 eth0
    10.1.11.0 * 255.255.255.0 U 0 0 0 eth0
    -------------------------------------------------------------------------




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