lkml.org 
[lkml]   [1998]   [Oct]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: Massive TCPv4 bad checksum
    On Tue, Oct 20, 1998 at 11:18:12AM +0200, Geert Uytterhoeven wrote:
    > On Mon, 19 Oct 1998, Andi Kleen wrote:
    > > On Sun, Oct 18, 1998 at 10:12:41PM +0200, Geert Uytterhoeven wrote:
    > > > On Sun, 18 Oct 1998, H.J. Lu wrote:
    > > > > > Geert Uytterhoeven <geert@geert.cs.kuleuven.ac.be> writes:
    > > > > > > On Sat, 17 Oct 1998, H.J. Lu wrote:
    > > > > > >> I have massive TCPv4 bad checksum on my CSLIP link from
    > > > > > >> my CSLIP server to my machine ever since I upgraded to
    > > > > > >> linux 2.1.1xx. Any suggestions?
    > > > > >
    > > > > > > My m68k box generates plenty of these messages when receiving packets from my
    > > > > > > PPC box. This would indicate a bug in the checksum code for either (or both)
    > > > > > > m68k and PPC.
    > > > > >
    > > > > > > But I also see the message on my AXP box, when receiving packets from the PPC.
    > > > > > > The Intel box on our network reports no bad checksums at all. None of the
    > > > > > > Linux boxes report any bad checksums from the Winslows machines.
    > > > > >
    > > > > > > Who's (who are?) the bad guy(s)?
    > > > > >
    > > > > > Is there a systematic on what types of packets arrive with bad checksums?
    > > > > >
    > > > >
    > > > > Most of the bad packets are from ftp and rsh. As the result, my
    > > > > ftp and CVS over rsh on my CSLIP link are much slower than 2.0.
    > > >
    > > > Mine come mostly from ssh, and some from auth:
    > >
    > > Is it possible that these were RST packets (caused when the connection
    > > is closed on the other side) ?
    >
    > How can I find out?

    Try if telnet otherhost notboundport causes a checksum error. If not I
    can supply a tcpdump patch to check tcp checksums.


    -Andi

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.rutgers.edu
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:45    [W:0.022 / U:0.668 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site