Re: IPv4 v IPv6
Hi.
On Mon, Jun 17, 2019 at 10:38:27AM -0400, Gene Heskett wrote:
> But that opens yet another container of worms. If I arbitrarily assign
> ipv6 local addresses, and later, ipv6 shows up at my side of the router,
> what if I have an address clash with someone on a satellite circuit in
> Ulan Bator. How is that resolved, by unroutable address blocks such as
> 192.168.xx.xx is now?
More or less yes. It's called ULA (Unique Local Address) in IPv6 lingua.
If you're using anything from fd00:/8 - you're safe.
> What I've read so far has not addressed this serious security concern.
> Or even mentioned it.
I fail to see any security issue here. Availability - sure.
> If in the future all addressing is by dhcpd6,
Nobody does that, unless you're Amazon. It's either static, or RA.
> how do the other machines on my local net, advertise their presence to the
> other machines on my local net.
IPv4 way of doing it is called ARP.
IPv6 way of doing it is called ICMPv6 types 135 and 136.
Both are limited to a single network segment (in a L2 sense of the word)
by design, so the outside world is not aware of this.
Reco
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