Configuring pppd to accept link-local IPv6 interface id from remote peer

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I originally asked this question on the "Unix and Linux" StackExchange:

But i suspect it is a bit too niche and have not had a response there.

I have two pppd (v2.4.7) instances running, talking to each over over a serial port link. But I can't work out how to get the 'client' pppd to accept the link-local IPv6 interface identifier provided by the 'server' pppd. I am trying to use static addresses so I know the link-local IP address of the remote peer.

On the 'server' I am running:
  pppd file ./ppp-options ipv6 ::1,::2 /dev/ttyAMA0 115200

And on the 'client', I am running:
  pppd file ./ppp-options ipv6cp-accept-local /dev/ttyAMA0 115200

This is the contents of ppp-options on both:

The pppd man page says:
    With this option, pppd will accept the peer's idea of our local IPv6 interface     identifier, even if the local IPv6 interface identifier was specified in an option.

But that doesn't seem to be the behaviour I am experiencing.

The client always just uses a locally chosen interface identifier instead. It was suggested to me to try setting the 'client' local interface identifier to all-zero but I have not found a way of doing this through configuration. Or alternatively get the 'server' to Nack the clients choice of interface identifier - but I'm not sure how to achieve that with pppd.

I have now managed to get it working by hacking ipv6cp.c to keep the local identifier as all-zero, by disabling a couple of calls to eui64_magic_nz. But I am not sure what the proper solution is.

Does there need to be an IPv6 equivalent to 'noipdefault' to use in conjunction with 'ipv6cp-accept-local'?



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