Re: [MirageOS-devel] mirage-www on xen and networking (on ARM)

[Magnus Therning <magnus@xxxxxxxxxxxx>]

On Sun, Mar 29, 2015 at 05:36:33PM +0100, David Scott wrote:
> On Sun, Mar 29, 2015 at 5:02 PM, Magnus Therning <magnus@xxxxxxxxxxxx>
> wrote:
[..]
> So it looks like you're receiving truncated IP frames. It would be helpful
> to know what the frames actually are-- could you do something like:
> 
> git clone git://github.com/mirage/mirage-tcpip
> cd mirage-tcpip
> git checkout v2.3.0
> 
> perhaps change the assert into something like
> 
> if Cstruct.len data <> payload_len then begin
>   printf "argh, it's all broken! len = %d payload_len = %d\n" (Cstruct.len
> data) payload_len;
>   Cstruct.hexdump buf;
> end
> 
> (quoting the Cstruct manual:
>  " when the going gets tough, the tough hexdump their cstructs
>     and peer at it until the bug disappears.  This will directly
>     prettyprint the contents of the cstruct to the standard output. ")
> 
> opam pin add tcpip .
> 
> .. and then rebuild your app with the new code.

After doing that, rebuilding and starting the VM again I get this on
the console

    ...
    argh, it's all broken! len = 26 payload_len = 20

    45 00 00 28 2b af 40 00 40 06 8d af c0 a8 00 0b 
    c0 a8 00 16 ea 30 00 50 d0 90 08 dc 1a fe 26 b0 
    50 11 00 e5 27 e1 00 00 00 00 00 00 00 00 
    argh, it's all broken! len = 26 payload_len = 20

    45 00 00 28 2b b0 40 00 40 06 8d ae c0 a8 00 0b 
    c0 a8 00 16 ea 30 00 50 d0 90 08 dc 1a fe 26 b0 
    50 11 00 e5 27 e1 00 00 00 00 00 00 00 00 
    argh, it's all broken! len = 26 payload_len = 20

    45 00 00 28 2b b1 40 00 40 06 8d ad c0 a8 00 0b 
    c0 a8 00 16 ea 30 00 50 d0 90 08 dc 1a fe 26 b0 
    50 11 00 e5 27 e1 00 00 00 00 00 00 00 00 
    argh, it's all broken! len = 26 payload_len = 20

    45 00 00 28 2b b2 40 00 40 06 8d ac c0 a8 00 0b 
    c0 a8 00 16 ea 30 00 50 d0 90 08 dc 1a fe 26 b0 
    50 11 00 e5 27 e1 00 00 00 00 00 00 00 00 
    argh, it's all broken! len = 26 payload_len = 20

    45 00 00 28 2b b3 40 00 40 06 8d ab c0 a8 00 0b 
    c0 a8 00 16 ea 30 00 50 d0 90 08 dc 1a fe 26 b0 
    50 11 00 e5 27 e1 00 00 00 00 00 00 00 00 
    argh, it's all broken! len = 26 payload_len = 20

    45 00 00 28 2b b4 40 00 40 06 8d aa c0 a8 00 0b 
    c0 a8 00 16 ea 30 00 50 d0 90 08 dc 1a fe 26 b0 
    50 11 00 e5 27 e1 00 00 00 00 00 00 00 00 
    ARP responding to: who-has 192.168.0.22?
    argh, it's all broken! len = 26 payload_len = 8

    45 00 00 1c 00 00 00 00 01 02 19 36 c0 a8 00 01 
    e0 00 00 01 11 0a ee f5 00 00 00 00 00 00 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 
    argh, it's all broken! len = 26 payload_len = 12

    45 00 00 20 00 00 00 00 01 02 19 32 c0 a8 00 01 
    e0 00 00 01 11 0a ec 78 00 00 00 00 02 7d 00 00 
    00 00 00 00 00 00 00 00 00 00 00 00 00 00
    ...

This time around I don't get anything in reply to my requests though.

/M

-- 
Magnus Therning                      OpenPGP: 0xAB4DFBA4 
email: magnus@xxxxxxxxxxxx   jabber: magnus@xxxxxxxxxxxx
twitter: magthe               http://therning.org/magnus

As long as there are ill-defined goals, bizarre bugs, and unrealistic
schedules, there will be Real Programmers willing to jump in and Solve The
Problem, saving the documentation for later.  Long live Fortran!
     -- Ed Post

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