Re: toubles with 4-port adaptec-nic

Alan Cox (alan@lxorguk.ukuu.org.uk)
Mon, 8 Nov 1999 21:59:15 +0000 (GMT)


> > -ping shows checksum-errors (see log below)
>
> This is a bug in 'ping'. (I get *lots* of bogus bug reports about this.)

Are you sure. The ping bug I know about kicks in on a one second rtt

> > # ping -n a.b.c.d
> > PING a.b.c.d (a.b.c.d) from a.b.c.e : 56(84) bytes of data.
> > 64 bytes from a.b.c.d: icmp_seq=0 ttl=255 time=3.1 ms (BAD CHECKSUM!)
> > wrong data byte #14 should be 0xe but was 0x2
>
> This is the 'ping' bug.
> The hardware CRC and IP checksum will prevent corrupted packets from being
> seen.

The ping program is doing ICMP sockets raw. This is not the case. Ping will
see real IP layer errors, but not ethernet ones

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