[Guy Harris <guy@xxxxxxxxxx>]

> Can Ethereal be configured to use a Buffer of a fixed size?

No.

> Also can I save the captures to another disk on the LAN.  Either in
> Windows on a mapped drive or on an NFS mount in UNIX.

Ethereal neither knows nor cares which particular pluggable file system
module - a local module such as {VFAT,NTFS,UFS,ext2,...} or a
distributed file system such as {NFS,CIFS,...} - in your OS's kernel
implements the file system containing the file to which it's writing.

However, note that, if Ethereal is capturing traffic on the network over
which the NFS or CIFS write requests are sent, and it's not running with
a capture filter that excludes the NFS or CIFS traffic in question, the
write requests will be captured by Ethereal and written to the file,
generating more write requests - even if this doesn't cause an infinite
expansion of the data written to the file, it does run the risk of
bloating the capture file....