Hi Tore, >Does anyone know what tricks, if any, the major 6RD deployments (AT&T, >Free, Swisscom, others?) are using to alleviate any problems stemming >from the reduced IPv6 MTU? Some possibilities that come to mind are:
>* Having the 6RD CPE lower the TCP MSS value of SYN packets as they >enter/exit the tunnel device >* Having the 6RD BR lower the TCP MSS value in the same way as above >* Having the 6RD CPE advertise a lowered MTU to the LAN in RA Options >* Several (or all) of the above in combination We advertise an MTU of 1472 in the RA Options. We still have a small number of PPPoE users and the max-payload-tag is not working reliably enough on third-party devices. Hence: 1500 Bytes - 20 Bytes IPv4 - 8 Bytes PPPoE = 1472 Bytes \Martin
