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Re: Discouraging :local:

From: Kenneth Porter
Subject: Re: Discouraging :local:
Date: Mon, 27 Jan 2003 22:38:40 -0800

--On Monday, January 27, 2003 6:20 PM -0500 "Greg A. Woods"
<address@hidden> wrote:

> As far as I know samba has no locking protocol (I
> don't think the underlying SMB protocol has locking either, but I may be
> mistaken).

There's something called an "opportunistic lock" or "oplock", opportunistic
to allow some write caching. Also, file creation can be atomic so the CVS
master lock file scheme should work.

> Well, generically speaking Ethernet's FCS field is a 32-bit CRC of the
> whole data frame.  However if I understand the math correctly that means
> that only 32-bit or shorter errors (remember Ethernet is serial) can be
> detected reliabliy and "only" about 99.955% of error bursts longer than
> 32 bits can be detected.  Ethernet frames containing TCP or UDP IP
> packets can be large -- up to ~1500 bytes.

One could presumably enhance this by encrypting the connection (eg. SSL) so
that the encryption system supplies another layer of error detection.
Anyone know how much, if any, that improves the result?

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