ping from redhat 5.2 kernel 2.0.36 to redhat 6.0 kernel 2.2.9 system with
size 1475 results in responses.
Looks like a redhat ping binary issue?
On Fri, 11 Jun 1999 jakob@ostenfeld.dk wrote:
> 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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