SIP on FTTH systems

Mikael Abrahamsson swmike at
Sat Feb 8 04:38:29 UTC 2014

On Sat, 8 Feb 2014, Anders Löwinger wrote:

> I'm curious on the details:
> 1)
> Do you give the client 64 bit using RA (with the A and L bit cleared), 64 bit 
> using DHCPv6, then force the traffic through the default since on-link is not 
> set?


> Has there been any test if modern operating systems honor this?

Well, they would be defective if they didn't. Also, you don't even need to 
announce the prefix at all, even with L-bit cleared. You can make RAs with 
M and O bit set that won't contain any prefix at all. Been there, done 
that. At least linux worked perfectly.

> Do you only use link-local on the customer port, and use a L3 CPE & 

That's one way of doing it, or you give it an IA_NA as well if you want a 
WAN address.

Mikael Abrahamsson    email: swmike at

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