Messages in this thread | | | Date | Thu, 26 Mar 1998 07:30:39 -0500 (EST) | From | Scott Lampert <> | Subject | Re: "Greased TCPenguin" |
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On 26-Mar-98 Trevor Johnson wrote: > With an internal v.34 modem, I get a few of those errors: > > Dec 4 16:53:59 dennis1 kernel: TCPv4 bad checksum from > 207.219.98.1:d9aa > to 155.135.1.24:0014, len=24/24/44 > Dec 5 01:18:44 dennis1 kernel: TCPv4 bad checksum from > 209.67.19.99:0050 > to 155.135.1.24:51b0, len=20/20/40 > Dec 5 01:18:57 dennis1 kernel: TCPv4 bad checksum from > 209.67.19.99:0050 > to 155.135.1.24:51b9, len=20/20/40 > Dec 5 01:21:00 dennis1 kernel: TCPv4 bad checksum from > 209.67.19.99:0050 > to 155.135.1.24:5259, len=20/20/40 > Dec 14 15:05:16 dennis1 kernel: TCPv4 bad checksum from > 204.181.3.203:0050 > to 155.135.1.29:086b, len=874/874/894 > Dec 14 15:05:45 dennis1 kernel: TCPv4 bad checksum from > 204.181.3.203:0050 > to 155.135.1.29:086d, len=1165/1165/1185 > Dec 31 13:58:32 dennis1 kernel: TCPv4 bad checksum from > 206.184.214.34:0014 to 155.135.1.22:0831, len=1480/1480/1500 > Dec 31 14:45:03 dennis1 kernel: TCPv4 bad checksum from > 206.184.214.34:0014 to 155.135.1.22:0832, len=1480/1480/1500 > Mar 25 23:41:58 dennis1 kernel: TCPv4 bad checksum from > 208.147.140.18:0017 to 155.135.1.35:08b6, len=20/20/40 > > I'm using ppp 2.3.3, a 2.1.72 kernel, and glibc 2.0.6. On the other end > of the PPP connection is an Intel v.34 modem and a Cisco 7000 > communications server.
I'm getting lots of these:
Mar 26 00:56:34 altair kernel: <7>TCPv4 bad checksum from 208.131.128.6:0016 to 205.138.63.5:0470, len=532/532/552 Mar 26 00:57:12 altair last message repeated 85 times Mar 26 00:57:58 altair last message repeated 73 times
In every instance the digits after len= are different, a quick perusal shows 20/20/40, 40/40/60, 1480/1480/1500. I wonder if 20 is significant? :)
I'm running on an ethernet network with 2.1.91-pre1, glibc 2.0.7 and a Kingston DEC21041 based ethernet card. Hope this helps someone. -Scott
--- Scott Lampert | Home Page: http://www.heavymetal.org <fortunato@heavymetal.org> | PGP Key: finger fortunato@heavymetal.org "Black holes are where God +----------------------------------------- divided by zero."
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