MTU and ICMP issue

[GoogleCodeExporter]

What steps will reproduce the problem?
1.

ICMP package on IPv4 should be reflected to the IPv6 according to RFC2893.
But TB-TUN has nothing to do with ICMP.

2.

According to RFC3506, "If the IPv6 MTU size proves to be too large for some
intermediate IPv4 subnet, IPv4 fragmentation will ensue....The IPv4 'do not
fragment' bit *SHOULD NOT* be set in the encapsulating IPv4 header." But
TB-TUN disobey these 2 rules. It causes IPv6 packages missing data and did
not report any error by ICMP when IPv6 MTU is to large.

What is the expected output? What do you see instead?


Please use labels and text to provide additional information.

Original issue reported on code.google.com by [email protected] on 25 Apr 2010 at 5:50