Re: 2.2.10 Alpha, CONFIG_FILTER, and localhost ping wierdness

Thorsten Kranzkowski (th@Marvin.DL8BCU.ampr.org)
Thu, 5 Aug 1999 23:13:30 +0000

On Thu, Aug 05, 1999 at 03:09:04PM +1200, Andrew McGregor wrote:
> I have been trying to set up a DHCP server on our Alpha, and somehow I
> created a situation where this happens:
>
> [andrewm@alpha andrewm]$ ping -c 1 localhost
> PING localhost (127.0.0.1): 56 data bytes
> 64 bytes from 127.0.0.1: icmp_seq=0 ttl=255 time=0.2 ms
> wrong data byte #8 should be 0x8 but was 0xe3
> c d e f 10 11 12 13 14 15 16 17 18 19 1a 1b 1c 1d 1e 1f 20 21 22 23 24
> 25 26 27 28 29 2a 2b
> 2c 2d 2e 2f 0 0 0 0 0 0 0 0 0 0 0 0
>
> --- localhost ping statistics ---
> 1 packets transmitted, 1 packets received, 0% packet loss
> round-trip min/avg/max = 0.2/0.2/0.2 ms
>
> The invalid byte varies, apparently at random.
>
> I'd like to know what is going on, because other forms of localhost IP
> connection also fail, including DNS.

Your ping is broken. The varying byte(s) is/are part of the timestamp but
shouldn't be. This is a 64 Bit problem - on a 32 Bit machine (intel ...)
it works by luck :-).

I can send you my patch against ping-0.12 (netkit) if you wish.
I also sent it to the netkit maintainer but didn't receive an answer yet.

Anyone knows whether he's alive or I have the wrong address
<netbug@ftp.uk.linux.org> ?

It seems others have also fixed this but I don't remember where to find
those patches. Maybe even at RetHat?

>
> System: Alpha LX164, 21164, 666MHz, RedHat 6.0, problem occurs in both
> 2.2.7 and 2.2.10. It does not occur if CONFIG_FILTER is turned off, but
> then DHCPD doesn't work.

Can't comment on that.

Bye,
Thorsten

-- 
| Thorsten Kranzkowski            Snail: Niemannsweg 30, 49201 Dissen, Germany |
| Mobile: ++49 161 7210230         Inet: dl8bcu@gmx.net                        |
| Ampr: dl8bcu@db0nei.#nrw.deu.eu, dl8bcu@marvin.dl8bcu.ampr.org [44.130.8.19] |


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