Re: [sunset4] future of dnssec?

["Heatley, Nick" <[e-mail]>]

It is not the phone where the blocker is, Mark.
It is Core Network "policy, control and charging".
Encapsulation obstructs any IP function that must be performed prior to the NAT to the outside.



-----Original Message-----
From: Mark Andrews [mailto:[e-mail]] 
Sent: 23 February 2017 13:07
To: Heatley, Nick
Cc: Marc Blanchet; [e-mail]
Subject: Re: [sunset4] future of dnssec?


In message <[e-mail].C
O.UK>, "Heatley, Nick" writes:
> Some networks do not work successfully with the additional encapsulation.
> Mobile networks are the case in point.
> So the translation tech rightfully exists.

464XLAT is encapsulation with translation.  It drops the IPv4 path MTU from 1500 to 1480.  DS-Lite drops the IPv4 MTU to 1460.  You can't avoid the issue with tethered equipement.

For TCP connection initiatiate from the host you shouldn't be seeing PMTU issues with either 464XLAT or DS-Lite as both should be presenting iterface MTU that doesn't result in PTB's being generated by the teco's equipement.  For 464XLAT the mss should be that of IPv6.  For DS-Lite in the host mode the mss should be 20 bytes smaller.

Or can't the phone manufactures actually do DS-Lite host mode properly if they were to try?

Encapsulation in the connection initiating device is different to encapsulation in the middle of the path.  You start out with a smaller MTU.

Mark

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