FYI, here's my tunnel MTU guy that I showed back during the Vancouver meeting (December 2007)? I think he is still left with the same conundrum today that he was back then...
Fred [email protected] > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Templin, Fred L > Sent: Friday, October 08, 2010 10:18 AM > To: Softwires; [email protected] > Subject: [Softwires] IPv6 VPNs configured over 1280 MTU tunnels > > End systems in end user networks that connect to the > IPv6 Internet will likely want to configure IPv6 VPNs, > e.g., so that they can securely connect to their home > office networks. Those VPN links must present a 1280 > minimum MTU to upper layers, but if they traverse a > link in the path with a too-small MTU then the end > system will see an MTU underrun and will need to use > IPv6 fragmentation. > > An IPv6-in-IPv4 tunnel with a fixed static 1280 MTU is > an example of a link in the path that could cause such > an MTU underrun for end system VPN links. So, should we > be concerned that tunnels with a fixed 1280 MTU would > make life difficult for the common operational practice > of end systems using VPNs? > > Thanks - Fred > [email protected] > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of > > Templin, Fred L > > Sent: Friday, October 08, 2010 7:52 AM > > To: Yiu L. Lee; Brian E Carpenter; Ole Troan > > Cc: Softwires; [email protected] > > Subject: Re: [v4tov6transition] [Softwires] ISP support of > > NativeIPv6across NAT44 CPEs -Proposed 6a44 Specification > > > > > > > CPE. This double tunneling tech seems scary. > > > > More to this point about double-tunneling, how were > > folks thinking that IPv6 VPNs would be run over a > > 1280 MTU IPv6-in-IPv4 tunnel? That is double-tunneling, > > and seems like it would be a quite common case, but the > > MTU seems deficient. Should it use IPv6 fragmentation? > > > > Fred > > [email protected] > > _______________________________________________ > > v4tov6transition mailing list > > [email protected] > > https://www.ietf.org/mailman/listinfo/v4tov6transition > > > _______________________________________________ > Softwires mailing list > [email protected] > https://www.ietf.org/mailman/listinfo/softwires >
Tunnel-MTU.pdf
Description: Tunnel-MTU.pdf
_______________________________________________ Softwires mailing list [email protected] https://www.ietf.org/mailman/listinfo/softwires
