[Cerowrt-devel] dnsmasq ipv6 stuff
cerowrt-devel+phil at spodhuis.org
Wed Jan 23 02:24:18 EST 2013
On 2013-01-22 at 19:14 -0500, Chris Lawrence wrote:
> True, although I think that's pretty much unavoidable given the design
> of ipv6 though (isn't ::1 always the router for the subnet)?
No, the router can have any IP within that subnet, but it will also join
various multicast groups.
Link-local multicast is ff02:: and the ::2 address is "all routers", so
given "se00" as a network device name:
should elicit a response from every device on the LAN connected to
CeroWRT's first LAN interface, where the device thinks that it's a
Within the multicast assignments (ff0X::) ::1 is all nodes, so
gets a response from every machine which has IPv6 configured up,
assuming no packet filters.
This is defined for ff0X for X with 1, 2 and 5 (interface-local (ie,
this machine), link-local and site-local). Fortunately, IPv6 doesn't
define this for the global scope, ff0e::, otherwise there would be a
teensy amplification factor for a response to a spoofed ICMP source
address sending a ping to ff0e::1.
For CeroWRT and debugging, the other interesting address in ff02:: (so
you need the %device scoping control on the address) is ff02::1:2 for
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