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    SubjectRe: ICMP in 2.2.9 (was 3c575)
    On Fri, Jun 11, 1999 at 03:26:56AM +0100, Alan Cox wrote:
    > > Can anyone confirm, that it is not possible to ping machines running
    > > the 2.2.9 kernel with ping packets of size 1475 ?
    >
    > Yes. Just fine. You probably have a buggy ping binary.

    But it's a buggy ping binary on three different releases of redhat
    on four different kernels then.

    I do ping -s 1475 some.host.somewhere and get no replies.

    This is getting weirder by the minute... Perhaps I should get some
    sleep soon...


    Host 1 (2.2.7, RH5.9, 3com905)
    Host 2 (2.2.3, RH5.2, Tulip)
    Host 3 (2.0.36, RH5.1, Tulip)
    Host 4 (2.2.9, RH6.0, Tulip)

    1 2 3 4 (destination)
    ---------------------
    1| N N N
    2| Y Y Y
    3| Y Y Y
    4| N N N
    (source)

    Yikes. The pattern as I see it is, ping with glibc2.1 cannot
    send _good_ ICMP echo requests.

    The really funny thing is, that where you see a `N', eg. when host
    1 pings host 3, the echo request packets actually reaches host 3,
    but host 3 never sends a reply. (Seen with tcpdump on host 3)
    I guess the kernel discards the requests for some reason (??)


    Unfortunately I only have RedHat boxes around here, so I can't test
    whether it's just RedHat's ping in 5.9 and 6.0 that's screwed, or
    it's the glibc. But ok, this is not a kernel issue. Darn, so close :)

    Regards,

    ................................................................
    : jakob@ostenfeld.dtu.dk : And I see the elder races, :
    :.........................: putrid forms of man :
    : Jakob Østergaard : See him rise and claim the earth, :
    : OZ9ABN : his downfall is at hand. :
    :.........................:............{Konkhra}...............:

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