<div dir="ltr"><span style="color:rgb(80,0,80)">></span><br><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div class="im">
> I have in the past seen firewalls that dropped some critical packets but<br>
> allowed others through (in one case: RS/RA were fine but ND was<br>
> filtered, which led to IPv4 working in 3 second spurts, i.e. until NUD<br>
> kicked in).<br>
<br>
</div>That's assuming there was no link-local communication, but just packets<br>
being send/received to the external network?<br>
<div class="im"></div></blockquote></div></div><div class="gmail_extra"><br></div><div class="gmail_extra" style>I wrote this up in 2009, so it's old and I'm told the Norton firewall bug has since been fixed, but:</div>
<div class="gmail_extra" style><br></div><div class="gmail_extra" style> <a href="https://sites.google.com/site/ipv6center/icmpv6-is-non-optional">https://sites.google.com/site/ipv6center/icmpv6-is-non-optional</a></div>
</div>