ip6sec broken *differently* in 2.5.66 :-)

[bert hubert <ahu@xxxxxxx>]

Alexey, thanks for the work on ip6sec but it still does slightly the wrong
thing here.

snapcount:~# ping6 -s 1406 deef.ds9a.nl

43.14 snapcount.ipv6.ds9a.nl > deef.ds9a.nl:
        AH(spi=0x00003d54,sumlen=16,seq=0x1e7): ESP(spi=0x00003d55,seq=0x1e7) 
        [hlim 0] (len 1456)
43.14 deef.ds9a.nl > snapcount.ipv6.ds9a.nl: icmp6: 
        echo reply (len 1414, hlim 64)

If I make the ping one byte bigger, nothing gets sent out! This goes on
until ping6 -s 1452, and then suddenly with ping6 -s 1453:

43.57 snapcount.ipv6.ds9a.nl > deef.ds9a.nl:
        AH(spi=0x00003d54,sumlen=16,seq=0x327): ESP(spi=0x00003d55,seq=0x327) 
        [hlim 0] (len 64)

Like the first segment didn't make it. If I further increase the pingsize to
-s 1455, this happens:

34.02 snapcount.ipv6.ds9a.nl > deef.ds9a.nl:
        AH(spi=0x00003d54,sumlen=16,seq=0x409): ESP(spi=0x00003d55,seq=0x409) 
        [hlim 0] (len 72)

Anything I can do to help, let me know.

Thanks.
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