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SubjectRe: "Greased TCPenguin"
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...

Rik.
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