Date: Thu, 18 Jul 2024 18:11:53 +0200 From: Santiago Martinez <sm@codenetworks.net> To: freebsd-net@freebsd.org Subject: Re: Multiple Fibs and INET6 Message-ID: <70305bf3-cfe4-4cdd-8cb8-c03c1a9c2b8f@codenetworks.net> In-Reply-To: <F7B1F9E1-30E0-4BC2-84F8-697A655A2C44@FreeBSD.org> References: <da781b66-4ab3-426f-bf56-f453030c6e61@codenetworks.net> <F7B1F9E1-30E0-4BC2-84F8-697A655A2C44@FreeBSD.org>
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Interesting, I'm running 14.1p2.
how does your routing table looks for fib1 ?
Santi
On 7/18/24 18:09, Zhenlei Huang wrote:
>
>
>> On Jul 13, 2024, at 1:06 AM, Santiago Martinez <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
>>
>>
>
>
>
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<p>Interesting, I'm running 14.1p2.</p>
<p>how does your routing table looks for fib1 ?</p>
<p>Santi</p>
<p><br>
</p>
<div class="moz-cite-prefix">On 7/18/24 18:09, Zhenlei Huang wrote:<br>
</div>
<blockquote type="cite"
cite="mid:F7B1F9E1-30E0-4BC2-84F8-697A655A2C44@FreeBSD.org">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<br class="">
<div><br class="">
<blockquote type="cite" class="">
<div class="">On Jul 13, 2024, at 1:06 AM, Santiago Martinez
<<a href="mailto:sm@codenetworks.net"
class="moz-txt-link-freetext" moz-do-not-send="true">sm@codenetworks.net</a>>
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) <br class="">
-- two 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="">
inet6 ::1 prefixlen 128 <br class="">
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="">
inet6 fe80::1%lo1 prefixlen 64 scopeid 0x3<br
class="">
<br class="">
</span></p>
<p class="">If I do a netstat -rn -6 -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 Gateway
Flags Netif Expire <br
class="">
::/96 link#2
URS lo0 <br class="">
::1 link#2
UHS lo0 <br class="">
::ffff:0.0.0.0/96 link#2
URS lo0 <br class="">
fe80::%lo0/10 link#2
URS lo0 <br class="">
fe80::%lo0/64 link#2
U lo0 <br class="">
fe80::1%lo0 link#2
UHS lo0 <br class="">
ff02::/16 link#2
URS lo0<br class="">
<br class="">
</span></p>
Now, netstat -rn -6 -F1 shows "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 Gateway
Flags Netif Expire <br
class="">
fe80::%lo1/64 link#3
U lo1 <br class="">
<b class="">fe80::1%lo0 link#2
UHS 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>```</div>
<div># sysctl net.fibs=3</div>
<div>net.fibs: 2 -> 3</div>
<div># ifconfig epair create</div>
<div># <span
style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"
class="">epair0a</span></div>
<div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"
class=""># ifconfig </span><span
style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"
class="">epair0a fib 2</span></div>
<div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"
class=""># ifconfig </span><span
style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"
class="">epair0a inet6 -ifdisabled up</span></div>
<div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);"
class=""># netstat -6rnF 2</span></div>
<div>
<div><font class="" color="#000000"><span
style="caret-color: rgb(0, 0, 0);" class="">Routing tables
(fib: 2)</span></font></div>
<div><font class="" color="#000000"><span
style="caret-color: rgb(0, 0, 0);" class=""><br class="">
</span></font></div>
<div><font class="" color="#000000"><span
style="caret-color: rgb(0, 0, 0);" class="">Internet6:</span></font></div>
<div><font class="" color="#000000"><span
style="caret-color: rgb(0, 0, 0);" class="">Destination
Gateway Flags
Netif Expire</span></font></div>
<div><font class="" color="#000000"><span
style="caret-color: rgb(0, 0, 0);" class="">fe80::%epair0a/64
link#5 U
epair0a</span></font></div>
<div><font class="" color="#000000"><span
style="caret-color: rgb(0, 0, 0);" class="">fe80::3b:b3ff:fe8f:9a0a%lo0
link#1 UHS lo0</span></font></div>
</div>
<div>```</div>
<div><br class="">
</div>
<div>The loopback route always refer the first loop interface, aka
lo0. </div>
<div>
<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 Gateway
Flags Netif Expire <br
class="">
fe80::%lo1/64 link#3
U lo1 <br class="">
<b class="">fe80::1%lo1 link#3
UHS lo1</b></span></p>
<p class=""><br class="">
</p>
<p class="">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.<span style="font-family:monospace"
class=""><br class="">
</span></p>
</div>
</div>
</blockquote>
<div>That is interesting. I can ping without failure.</div>
<div><br class="">
</div>
<div>```</div>
<div>
<div># setfib 1 ping6 -c3 fe80::1%lo1</div>
<div>PING(56=40+8+8 bytes) fe80::1%lo1 --> fe80::1%lo1</div>
<div>16 bytes from fe80::1%lo1, icmp_seq=0 hlim=64 time=0.050
ms</div>
<div>16 bytes from fe80::1%lo1, icmp_seq=1 hlim=64 time=0.067
ms</div>
<div>16 bytes from fe80::1%lo1, icmp_seq=2 hlim=64 time=0.096
ms</div>
<div><br class="">
</div>
<div>--- fe80::1%lo1 ping statistics ---</div>
<div>3 packets transmitted, 3 packets received, 0.0% packet
loss</div>
<div>round-trip min/avg/max/stddev = 0.050/0.071/0.096/0.019
ms</div>
</div>
<div>```</div>
<div><br class="">
</div>
<div>
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Best
regards,</div>
<div style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Zhenlei</div>
</div>
<br class="">
<blockquote type="cite" class="">
<div class="">
<div class="">
<p class=""><span style="font-family:monospace" class="">
</span></p>
<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><br class="">
</div>
</div>
<br class="">
</blockquote>
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