Oops - I meant for this to go to NGTRANS and V6OPS. Roy
> I've got a few of questions on configured tunnels, as described in > draft-ietf-ngtrans-mech-v2-01.txt. > > - Section 3.2 discusses how to set the tunnel MTU. It covers the case > where the tunnel MTU size is manually configured, with a default of > 1280. While it discusses capping the tunnel MTU at 4400 when IPv4 > path MTU discovery is used, it doesn't discuss a maximum configured > value for the tunnel. Does this mean there is no cap when manually > configuring the tunnel MTU (i.e., the configured tunnel MTU may be as > large as 65515, or even larger if jumbograms are used?) > > - The same section does not discuss what a host should do if it receives a > Router Advertisement with an MTU option. Should the MTU value received > be used? If so, is there a cap associated with this MTU value? In > other words, if it exceeds 4400 bytes should the value be used? > > - In section 3.5, the TOS byte is defined as being set to 0 unless > otherwise specified. What exactly does this mean? That, if RFC 2893 is > followed the DSCP in the TOS byte may be set to a non-zero value? Or > that RFC 2893 and RFC 3168 should explicitly NOT be implemented for > configured tunnels? If the latter, I think some discussion on exactly > WHY these two RFCs are not to be implemented would be helpful. > > - In section 3.6, the TOS byte of the inner packet is left unmodified at > the tunnel egress. This seems to contradict some of the referenced. > For instance, RFC 3168 defines both limited-functionality and > full-functionality support for ECN support over tunnels. For > limited-functionality, which seems to most closely match what is > described in this draft, it discusses what to do at the tunnel egress if > the CE option is set in the outer packet header but not the inner packet > header. This processing does not seem to match what is described in > this draft. Is this intentional? > > Roy -------------------------------------------------------------------- IETF IPng Working Group Mailing List IPng Home Page: http://playground.sun.com/ipng FTP archive: ftp://playground.sun.com/pub/ipng Direct all administrative requests to [EMAIL PROTECTED] --------------------------------------------------------------------
