Linux-kernel mailing list archive 1999-23,: Re: ICMP in 2.2.9 (was 3c575)

# Re: ICMP in 2.2.9 (was 3c575)

Rene Chaddock (renec@zorro.adsl.pangea.ca)
Fri, 11 Jun 1999 02:25:25 -0500 (CDT)

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Ping from redhat 6.0 kernel 2.2.5-something to redhat 6.0 kernel 2.2.9
system with size 1475 results in no response. other sizes are all good.

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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