Re: "Greased TCPenguin"
Richard Gooch (rgooch@atnf.CSIRO.AU)
Thu, 26 Mar 1998 22:09:24 +1100
Rik van Riel writes:
> On Thu, 26 Mar 1998, Richard Gooch wrote:
>
> > > > > >TCPv4 bad checksum from 130.155.198.47:0448 to 130.155.191.26:1770, len=32/32/52
> > > > > >TCPv4 bad checksum from 130.155.198.47:0201 to 130.155.191.26:03ff, len=20/20/4
> > > > >
> > > > > I read messages such us this a lot of times but I never related it to a
> > > > > possible TCP bug, I always think that the ppp/slip is a poor connection
> > > > > and can miss something (we use checksum for that cases no?).
> > > >
> > > > My modem link has compression and error checking, so in theory I have
> > > ^^^^^^^^^
> > > (but your serial cable between computer and modem hasn't), also note
> > > that theory and practice often differ. Another possibility is that
> > > the packets got corrupted further down the link.
> >
> > The modem cable is properly shielded. The serial link runs at 115 k.
> > Is this really likely?
>
> When you load your box high enough, or when DMA transfer is
> going on, you just might miss one serial interrupt...
My router box (running 2.1.86) runs entirely from RAMDISC. The only
cards in it are:
- NE2000 clone (ISA)
- S3928 ISA (no console logins)
The board is a P100 with integrated 16550A's. 32 MBytes of
RAM. Somehow I don't expect much DMA activity...
Regards,
Richard....
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