[Dnsmasq-discuss] Difference between SLAAC and RA-ONLY mode

Simon Kelley simon at thekelleys.org.uk
Tue Dec 17 16:55:51 GMT 2013

On 17/12/13 12:29, Shixiong Shang wrote:
> Hi, guys:
> I tried both “slaac” mode and “ra-only” modes with dnsmasq version 2.66. One thing I noticed was, both modes set the same bit value in the RA:
> M-bit = 0, O-bit = 0, A-bit = 1, L-bit = 1.
> I am wondering what’s the difference between these two modes then? Would you please shed some light on it?

There's no difference: "slaac" and "ra-only" have exactly the same 
effect. Reading back the manpage, the description is very confusing and 
should be re-written.

The reason for having two different keywords is that they can be used 
with and without DHCP

dhcp-range = 1234::1, 1234::100, slaac

will do RA with MOAL bits all set, and provide DHCPv6

dhcp-range = 1234::1, slaac

will do RA with only AL bits set, and not DHCP. It's maybe clearer to be 
able to be able to write.

  dhcp-range = 1234::1, ra-only

in this case.



> Thanks!
> Shixiong
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