Eduard,
> On Mar 25, 2021, at 2:05 AM, Vasilenko Eduard <[email protected]>
> wrote:
>
> Hi Joseph,
> It is exactly that I do not like most: complete eradicate PMTUD from any
> tunnel environment. Just prohibit it.
> RFC 2473:
> <>6.7 <https://tools.ietf.org/html/rfc2473#section-6.7> IPv6 Tunnel MTU
> The tunnel MTU is set dynamically to the Path MTU between the tunnel
> entry-point and the tunnel exit-point nodes, minus the size of the tunnel
> headers
> …
> The tunnel entry-point node performs Path MTU discovery on the path between
> the tunnel entry-point and exit-point nodes
If you obey this section of RFC2473, you cannot implement IPv6 over IPv6 if the
real network path MTU is 1280B, because then the tunnel would be 1280-hdrs,
which is necessarily smaller than required by IPv6.
That is why this is incorrect. The correct text should be:
6.7 <https://tools.ietf.org/html/rfc2473#section-6.7> IPv6 Tunnel MTU
The tunnel MTU is set dynamically to the egress reassembly MTU of the tunnel
exit-point node, minus the size of the tunnel headers
…
The tunnel entry-point node performs discovery of this egress reassembly MTU
where possible, or assumes the current IPv6 default of 1500-hdrs.
Joe
_______________________________________________
Int-area mailing list
[email protected]
https://www.ietf.org/mailman/listinfo/int-area
