Messages in this thread | | | Date | Fri, 1 May 1998 13:28:55 -0400 | From | Caleb Epstein <> | Subject | Re: [2.1.99] TCPv4 bad checksum |
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On Fri, May 01, 1998 at 10:16:10AM -0600, Kevin Fenzi wrote:
> Davem maintains (I am pretty sure correctly) that these are caused by > VJ header compression bugs in various other ppp implementations. > > Is there anything we can do to confirm this? > Is it significant that they are always of the form: > > XX/XX/XX+20 > > ie, are they all failing in the same way so the kernel could detect > this and work around it? Is the checksum always off by 20? > > Anyhow, these messages cause no harm that I can tell but it would be > nice to resolve them before 2.2...If nothing else, we should remove > them if they no longer tell us meaningfull info...
I have seen this as well, usually when I do a Ctrl-C on a terminal session over a PPP link to my office. This is both with and without asyncmap set to escape control characters. It may not be a bug in "other ppp implementations". See the following from the Changelog of PPP 2.3.4:
* Fixed some bugs in the linux driver and deflate compressor which were causing compression problems, including corrupting long incompressible packets sometimes.
Perhaps this is what we are all seeing?
-- [ cae @ jpmorgan.com | Caleb Epstein | JP Morgan & Co., Incorporated ]
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