<p>Yes, this network is a single physical segment. Link local addresses are limited to a single segment and I don't think that there is a way to route them. </p>
<p>I have been using IPv6 for a long time as well, but I have never really had a need to connect to a link local address before. I have tried to ping such addresses in the past as well, though, and an interface identifier is required to do so. </p>
<div class="gmail_quote">On Aug 17, 2012 9:03 AM, "Jeremy T. Bouse" <<a href="mailto:jeremy.bouse@undergrid.net">jeremy.bouse@undergrid.net</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
On 08/16/2012 01:41 PM, <a href="mailto:mike@trausch.us">mike@trausch.us</a> wrote:<br>
> Perhaps someone could explain something to me: why are interface<br>
> identifiers required for link-local communications, particularly on a<br>
> system that has only a single network interface?<br>
><br>
> e.g., I have a router that is using the address fe80::c9f:e0ff:fef1:ae2a<br>
> on my network. The system I am on uses fe80::6e62:6dff:fe53:103. But<br>
> if I want to reach the router by SSH, I must either SSH to its public<br>
> address, or I must do this:<br>
><br>
> ssh fe80::c9f:e0ff:fef1:ae2a%eth0<br>
><br>
> Or I get an "invalid argument" error.<br>
><br>
> The fact that I have only one interface shouldn't matter. I thought<br>
> IPv6 ND made it possible to hide exactly this sort of detail.<br>
><br>
> --- Mike<br>
><br>
Are both machines on the same physical network segment? I mean are the<br>
both wired or both wifi? the LL IPv6 interface addresses are meant for<br>
communication only on the same physical layer. My entire network here is<br>
dual-stacked and I've never had to specify the interface identifier.<br>
I've been working with IPv6 since '01 when I was working for NTT MCL<br>
back in CA.<br>
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</blockquote></div>