> 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
ensure the 6rd domain MTU is >=1520. > Also, given that some ISPs offer [only] Layer-2 service and expect/allow > their customers to bring their own Layer-3 home gateway if they want > one, I would find it interesting to learn if any of the most common > off-the-shelf home gateway products (that enable 6RD by default) also > implement any such tricks by default or not. cheers, Ole
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