<div dir="ltr"><div class="gmail_extra"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><p>On Mon, Jul 24, 2017 at 12:46 PM, David Farmer <span dir="ltr"><<a href="mailto:farmer@umn.edu" target="_blank">farmer@umn.edu</a>></span> wrote:<br></p></div></div></div></div></div></div></div></div></div></div></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">In practice Neighbor Discovery, and other critical protocols, need link-local addresses to talk to other link-local addresses and some multicast addresses. <div><br></div><div>Also, in theory a link-local address could talk to a GUA or ULA address on the same link. However, in practices does this really happen? If it does happen in practice what are circumstances?</div><div><br></div><div>Thanks<span class="gmail-HOEnZb"><font color="#888888"><br><div><div><br></div><div>-- <br><div class="gmail-m_-6362831682279248372gmail_signature">==============================<wbr>=================<br>David Farmer <a href="mailto:Email%3Afarmer@umn.edu" target="_blank">Email:farmer@umn.edu</a><br>Networking & Telecommunication Services<br>Office of Information Technology<br>University of Minnesota <br>2218 University Ave SE Phone: <a href="tel:(612)%20626-0815" value="+16126260815" target="_blank">612-626-0815</a><br>Minneapolis, MN 55414-3029 Cell: <a href="tel:(612)%20812-9952" value="+16128129952" target="_blank">612-812-9952</a><br>==============================<wbr>================= </div>
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</blockquote></div><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Not quite 100% related, but I had an upstream provider put an artisanal handcrafted IPv6 BCP38 ACL that didn't allow link-locals to talk to the multicast range (or to the GUA on-link address possibly) on a port, and it caused problems after a reboot I believe only. Things were able to keep working for quite a while if I recall.</div><div class="gmail_extra"><div class="gmail_extra"><div><div class="gmail_signature"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><p><br></p><p>Theodore Baschak - AS395089 - Hextet Systems<br><a href="https://bgp.guru/" target="_blank" style="font-size:12.8px">https://bgp.guru/</a><span style="font-size:12.8px"> - </span><a href="https://hextet.net/" target="_blank" style="font-size:12.8px">https://hextet.net/</a><br><a href="http://mbix.ca/" target="_blank" style="font-size:12.8px">http://mbix.ca/</a><span style="font-size:12.8px"> - </span><a href="http://mbnog.ca/" target="_blank" style="font-size:12.8px">http://mbnog.ca/</a></p><p><br></p></div></div></div></div></div></div></div></div></div></div></div></div></div>