IPv6 headers are 40 bytes, twice that of IPv4. Add 20 bytes for TCP headers, just as you would with IPv4, which gives you 60 bytes total for TCP/IPv6.
If using PPPoE you'd probably want an MSS of 1432 for IPv6. However, IPv4 headers can vary in length to greater than 20 bytes, but, IPv6 has a fixed IP header length so it should be predictable. Unless youre doing something fancy, 1452 should suffice for IPv4 in most deployments (at least going by experience). Tom On 19/03/2008, at 8:45 PM, Kevin Barrass wrote: > > Hi > > I'm playing with a IPv6 tunnel broker on my home ADSL/Cisco 1701 for > testing as we are deploying IPv6 at work over a long period. > On my ADSL router I have ip tcp adjust-mss 1452 to account for the ppp > over atm encapsulation overhead im assuming 1452 is correct as ive had > varying recommendations. Does anyone know what the overhead for IPv6 > in > IP is as I would like to adjust the MSS on traffic over the IPv6 > tunnel. > > Kind Regards > > Kev > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
