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Date:      Fri, 19 Jul 2024 00:15:12 +0800
From:      Zhenlei Huang <zlei@FreeBSD.org>
To:        Santiago Martinez <sm@codenetworks.net>
Cc:        freebsd-net@freebsd.org
Subject:   Re: Multiple Fibs and INET6
Message-ID:  <E2F8E66A-B141-47C4-B4B8-551D22784244@FreeBSD.org>
In-Reply-To: <70305bf3-cfe4-4cdd-8cb8-c03c1a9c2b8f@codenetworks.net>
References:  <da781b66-4ab3-426f-bf56-f453030c6e61@codenetworks.net> <F7B1F9E1-30E0-4BC2-84F8-697A655A2C44@FreeBSD.org> <70305bf3-cfe4-4cdd-8cb8-c03c1a9c2b8f@codenetworks.net>
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[-- Attachment #1 --]


> On Jul 19, 2024, at 12:11 AM, Santiago Martinez <sm@codenetworks.net> wrote:
> 
> Interesting, I'm running 14.1p2.
> 
> 

Yes, I'm running exactly the same version with you.
> how does your routing table looks for fib1 ?
> 
> 

```
# netstat -6rnF 1
Routing tables (fib: 1)

Internet6:
Destination                       Gateway                       Flags     Netif Expire
fe80::%lo1/64                     link#5                        U           lo1
fe80::1%lo0                       link#2                        UHS         lo0
```
> Santi
> 
> 
> 
> On 7/18/24 18:09, Zhenlei Huang wrote:
>> 
>> 
>>> On Jul 13, 2024, at 1:06 AM, Santiago Martinez <sm@codenetworks.net <mailto:sm@codenetworks.net>> wrote:
>>> 
>>> Hi Everyone.
>>> 
>>> While adding -F ( fib as used in netstat ) to ping and ping6 I have found something that from my understanding is not correct.
>>> Please can you advise?
>>> I have the following setup :
>>> 
>>> -- two fibs (0 and 1) 
>>> -- two  loop-backs (lo0 and lo1).
>>> -- Lo1 has been assigned to fib1
>>> -- net.add_addr_allfibs = 0
>>> My interface output looks like this:
>>> 
>>> 
>>> ifconfig lo0 | grep inet6 
>>>        inet6 ::1 prefixlen 128 
>>>        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2 
>>> 
>>> ifconfig lo1 | grep inet6 
>>>        inet6 fe80::1%lo1 prefixlen 64 scopeid 0x3
>>> 
>>> 
>>> If I do a netstat -rn -6  -F0 I get the following which is was i expected.
>>> 
>>> Internet6: 
>>> Destination                       Gateway                       Flags     Netif Expire 
>>> ::/96                             link#2                        URS         lo0 
>>> ::1                               link#2                        UHS         lo0 
>>> ::ffff:0.0.0.0/96                 link#2                        URS         lo0 
>>> fe80::%lo0/10                     link#2                        URS         lo0 
>>> fe80::%lo0/64                     link#2                        U           lo0 
>>> fe80::1%lo0                       link#2                        UHS         lo0 
>>> ff02::/16                         link#2                        URS         lo0
>>> 
>>> 
>>> Now,  netstat -rn -6  -F1 shows  "fe80::1%lo0" which should not be there and "fe80::1%lo1" is missing which should be there.
>>> 
>>> Internet6: 
>>> Destination                       Gateway                       Flags     Netif Expire 
>>> fe80::%lo1/64                     link#3                        U           lo1 
>>> fe80::1%lo0                       link#2                        UHS         lo0
>>> 
>> That seems wrong from my first glance. IIRC, there's HACK ( I'd prefer this ) for loopback route. For example
>> ```
>> # sysctl net.fibs=3
>> net.fibs: 2 -> 3
>> # ifconfig epair create
>> # epair0a
>> # ifconfig epair0a fib 2
>> # ifconfig epair0a inet6 -ifdisabled up
>> # netstat -6rnF 2
>> Routing tables (fib: 2)
>> 
>> Internet6:
>> Destination                       Gateway                       Flags     Netif Expire
>> fe80::%epair0a/64                 link#5                        U       epair0a
>> fe80::3b:b3ff:fe8f:9a0a%lo0       link#1                        UHS         lo0
>> ```
>> 
>> The loopback route always refer the first loop interface, aka lo0.  
>>> 
>>> 
>>> What output I was expecting was:
>>> Internet6: 
>>> Destination                       Gateway                       Flags     Netif Expire 
>>> fe80::%lo1/64                     link#3                        U           lo1 
>>> fe80::1%lo1                       link#3                        UHS         lo1
>>> 
>>> 
>>> 
>>> This makes the ping -6 -F0 fe80::1%lo0  to work but ping -6 -F1 fe80::1%l01 to fail which I wanted to use as test case.
>>> 
>> That is interesting. I can ping without failure.
>> 
>> ```
>> # setfib 1 ping6 -c3 fe80::1%lo1
>> PING(56=40+8+8 bytes) fe80::1%lo1 --> fe80::1%lo1
>> 16 bytes from fe80::1%lo1, icmp_seq=0 hlim=64 time=0.050 ms
>> 16 bytes from fe80::1%lo1, icmp_seq=1 hlim=64 time=0.067 ms
>> 16 bytes from fe80::1%lo1, icmp_seq=2 hlim=64 time=0.096 ms
>> 
>> --- fe80::1%lo1 ping statistics ---
>> 3 packets transmitted, 3 packets received, 0.0% packet loss
>> round-trip min/avg/max/stddev = 0.050/0.071/0.096/0.019 ms
>> ```
>> 
>> Best regards,
>> Zhenlei
>> 
>>> 
>>> Thanks in advance.
>>> 
>>> Santiago
>>> 
>>> 
>> 
>> 
>> 




[-- Attachment #2 --]
<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Jul 19, 2024, at 12:11 AM, Santiago Martinez &lt;<a href="mailto:sm@codenetworks.net" class="">sm@codenetworks.net</a>&gt; wrote:</div><br class="Apple-interchange-newline"><div class="">

  
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
  
  <div class=""><p class="">Interesting, I'm running 14.1p2.</p><div class=""><br class=""></div></div></div></blockquote><div><br class=""></div>Yes, I'm running exactly the same version with you.<br class=""><blockquote type="cite" class=""><div class=""><div class=""><p class="">how does your routing table looks for fib1 ?</p><div class=""><br class=""></div></div></div></blockquote><div><br class=""></div><div>```</div><div># netstat -6rnF 1</div><div>Routing tables (fib: 1)</div><div><br class=""></div><div>Internet6:</div><div>Destination &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Gateway &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Flags &nbsp; &nbsp; Netif Expire</div><div>fe80::%lo1/64 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; link#5 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;U &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; lo1</div><div>fe80::1%lo0 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; link#2 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;UHS &nbsp; &nbsp; &nbsp; &nbsp; lo0</div><div>```</div><blockquote type="cite" class=""><div class=""><div class=""><p class="">Santi</p><p class=""><br class="">
    </p>
    <div class="moz-cite-prefix">On 7/18/24 18:09, Zhenlei Huang wrote:<br class="">
    </div>
    <blockquote type="cite" cite="mid:F7B1F9E1-30E0-4BC2-84F8-697A655A2C44@FreeBSD.org" class="">
      <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" class="">
      <br class="">
      <div class=""><br class="">
        <blockquote type="cite" class="">
          <div class="">On Jul 13, 2024, at 1:06 AM, Santiago Martinez
            &lt;<a href="mailto:sm@codenetworks.net" class="moz-txt-link-freetext" moz-do-not-send="true">sm@codenetworks.net</a>&gt;
            wrote:</div>
          <br class="Apple-interchange-newline">
          <div class="">
            <meta http-equiv="content-type" content="text/html; charset=UTF-8" class="">
            <div class=""><p class="">Hi Everyone.</p>
              While adding -F ( fib as used in netstat ) to ping and
              ping6 I have found something that from my understanding is
              not correct.<br class="">
              Please can you advise?<br class=""><p class="">I have the following setup :</p>
              -- two fibs (0 and 1)&nbsp;<br class="">
              -- two&nbsp; loop-backs (lo0 and lo1).<br class="">
              -- Lo1 has been assigned to fib1<br class="">
              --<span style="background-color: rgb(255, 255, 255);" class=""> net.add_addr_allfibs = 0</span><p class=""><span style="background-color: rgb(255, 255, 255);" class="">My
                  interface output looks like this:<br class="">
                </span><span style="font-family:monospace" class=""></span></p>
              <div class=""><span style="font-family:monospace" class=""></span><br class="webkit-block-placeholder">
              </div><p class=""><span style="font-family:monospace" class=""><span style="background-color: rgb(255, 255, 255);" class="">ifconfig lo0 | grep inet6 </span><br class="">
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;inet6 ::1 prefixlen 128 <br class="">
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2 <br class="">
                </span></p><p class=""><span style="font-family:monospace" class="">ifconfig
                  lo1 | grep inet6 <br class="">
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;inet6 fe80::1%lo1 prefixlen 64 scopeid 0x3<br class="">
                  <br class="">
                </span></p><p class="">If I do a netstat -rn -6&nbsp; -F0 I get the
                following which is was i expected.<br class="">
              </p><p class=""><span style="font-family:monospace" class=""><span style="background-color: rgb(255, 255, 255);" class="">Internet6: </span><br class="">
                  Destination &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gateway
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Flags &nbsp;&nbsp;&nbsp;&nbsp;Netif Expire <br class="">
                  ::/96 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#2
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;URS &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0 <br class="">
                  ::1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#2
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UHS &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0 <br class="">
                  ::ffff:0.0.0.0/96 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#2
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;URS &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0 <br class="">
                  fe80::%lo0/10 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#2
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;URS &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0 <br class="">
                  fe80::%lo0/64 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#2
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;U &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0 <br class="">
                  fe80::1%lo0 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#2
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UHS &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0 <br class="">
                  ff02::/16 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#2
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;URS &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0<br class="">
                  <br class="">
                </span></p>
              Now,&nbsp; netstat -rn -6&nbsp; -F1 shows&nbsp; "fe80::1%lo0" which
              should not be there and "fe80::1%lo1" is missing which
              should be there.
              <div class=""><br class="webkit-block-placeholder">
              </div><p class=""><span style="font-family:monospace" class=""><span style="background-color: rgb(255, 255, 255);" class="">Internet6: </span><br class="">
                  Destination &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gateway
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Flags &nbsp;&nbsp;&nbsp;&nbsp;Netif Expire <br class="">
                  fe80::%lo1/64 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#3
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;U &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo1 <br class="">
                  <b class="">fe80::1%lo0 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#2
                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UHS &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0</b><br class="">
                </span></p>
            </div>
          </div>
        </blockquote>
        That seems wrong from my first glance. IIRC, there's HACK ( I'd
        prefer this ) for loopback route. For example</div>
      <div class="">```</div>
      <div class=""># sysctl net.fibs=3</div>
      <div class="">net.fibs: 2 -&gt; 3</div>
      <div class=""># ifconfig epair create</div>
      <div class="">#&nbsp;<span style="caret-color: rgb(0, 0, 0);" class="">epair0a</span></div>
      <div class=""><span style="caret-color: rgb(0, 0, 0);" class=""># ifconfig&nbsp;</span><span style="caret-color: rgb(0, 0, 0);" class="">epair0a fib 2</span></div>
      <div class=""><span style="caret-color: rgb(0, 0, 0);" class=""># ifconfig&nbsp;</span><span style="caret-color: rgb(0, 0, 0);" class="">epair0a inet6 -ifdisabled up</span></div>
      <div class=""><span style="caret-color: rgb(0, 0, 0);" class=""># netstat -6rnF 2</span></div>
      <div class="">
        <div class=""><font class=""><span style="caret-color: rgb(0, 0, 0);" class="">Routing tables
              (fib: 2)</span></font></div>
        <div class=""><font class=""><span style="caret-color: rgb(0, 0, 0);" class=""><br class="">
            </span></font></div>
        <div class=""><font class=""><span style="caret-color: rgb(0, 0, 0);" class="">Internet6:</span></font></div>
        <div class=""><font class=""><span style="caret-color: rgb(0, 0, 0);" class="">Destination &nbsp;
              &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Gateway &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Flags &nbsp;
              &nbsp; Netif Expire</span></font></div>
        <div class=""><font class=""><span style="caret-color: rgb(0, 0, 0);" class="">fe80::%epair0a/64
              &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; link#5 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;U &nbsp; &nbsp; &nbsp;
              epair0a</span></font></div>
        <div class=""><font class=""><span style="caret-color: rgb(0, 0, 0);" class="">fe80::3b:b3ff:fe8f:9a0a%lo0
              &nbsp; &nbsp; &nbsp; link#1 &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;UHS &nbsp; &nbsp; &nbsp; &nbsp; lo0</span></font></div>
      </div>
      <div class="">```</div>
      <div class=""><br class="">
      </div>
      <div class="">The loopback route always refer the first loop interface, aka
        lo0. &nbsp;</div>
      <div class="">
        <blockquote type="cite" class="">
          <div class="">
            <div class=""><p class=""><span style="font-family:monospace" class="">
                  <br class="">
                </span></p>
              What output I was expecting was:
              <p class=""><span style="font-family:monospace" class=""><span style="background-color: rgb(255, 255, 255);" class="">Internet6: </span><br class="">
                  Destination &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Gateway
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Flags &nbsp;&nbsp;&nbsp;&nbsp;Netif Expire <br class="">
                  fe80::%lo1/64 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#3
                  &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;U &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo1 <br class="">
                  <b class="">fe80::1%lo1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; link#3
                    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; UHS &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo1</b></span></p><p class=""><br class="">
              </p><p class="">This makes the ping -6 -F0 fe80::1%lo0&nbsp; to
                work but ping -6 -F1 fe80::1%l01 to fail which I wanted
                to use as test case.<span style="font-family:monospace" class=""><br class="">
                </span></p>
            </div>
          </div>
        </blockquote>
        <div class="">That is interesting. I can ping without failure.</div>
        <div class=""><br class="">
        </div>
        <div class="">```</div>
        <div class="">
          <div class=""># setfib 1 ping6 -c3 fe80::1%lo1</div>
          <div class="">PING(56=40+8+8 bytes) fe80::1%lo1 --&gt; fe80::1%lo1</div>
          <div class="">16 bytes from fe80::1%lo1, icmp_seq=0 hlim=64 time=0.050
            ms</div>
          <div class="">16 bytes from fe80::1%lo1, icmp_seq=1 hlim=64 time=0.067
            ms</div>
          <div class="">16 bytes from fe80::1%lo1, icmp_seq=2 hlim=64 time=0.096
            ms</div>
          <div class=""><br class="">
          </div>
          <div class="">--- fe80::1%lo1 ping statistics ---</div>
          <div class="">3 packets transmitted, 3 packets received, 0.0% packet
            loss</div>
          <div class="">round-trip min/avg/max/stddev = 0.050/0.071/0.096/0.019
            ms</div>
        </div>
        <div class="">```</div>
        <div class=""><br class="">
        </div>
        <div class="">
          <div style="caret-color: rgb(0, 0, 0);" class="">Best
            regards,</div>
          <div style="caret-color: rgb(0, 0, 0);" class="">Zhenlei</div>
        </div>
        <br class="">
        <blockquote type="cite" class="">
          <div class="">
            <div class=""><div class=""><span style="font-family:monospace" class="">
                </span><br class="webkit-block-placeholder"></div><p class="">Thanks in advance.</p>
              Santiago
              <p class=""><span style="font-family:monospace" class=""><br class="">
                </span></p>
            </div>
          </div>
        </blockquote>
      </div>
      <br class="">
      <div class="">
        <div class=""><br class="">
        </div>
      </div>
      <br class="">
    </blockquote>
  </div>

</div></blockquote></div><br class=""><div class="">
<div><br class=""></div>

</div>
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