Date: Fri, 19 Jul 2024 00:09:51 +0800 From: Zhenlei Huang <zlei@FreeBSD.org> To: Santiago Martinez <sm@codenetworks.net> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: Multiple Fibs and INET6 Message-ID: <F7B1F9E1-30E0-4BC2-84F8-697A655A2C44@FreeBSD.org> In-Reply-To: <da781b66-4ab3-426f-bf56-f453030c6e61@codenetworks.net> References: <da781b66-4ab3-426f-bf56-f453030c6e61@codenetworks.net>
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> On Jul 13, 2024, at 1:06 AM, Santiago Martinez <sm@codenetworks.net> =
wrote:
>=20
> Hi Everyone.
>=20
> 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 :
>=20
> -- two fibs (0 and 1)=20
> -- two loop-backs (lo0 and lo1).
> -- Lo1 has been assigned to fib1
> -- net.add_addr_allfibs =3D 0
> My interface output looks like this:
>=20
>=20
> ifconfig lo0 | grep inet6=20
> inet6 ::1 prefixlen 128=20
> inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2=20
>=20
> ifconfig lo1 | grep inet6=20
> inet6 fe80::1%lo1 prefixlen 64 scopeid 0x3
>=20
>=20
> If I do a netstat -rn -6 -F0 I get the following which is was i =
expected.
>=20
> Internet6:=20
> Destination Gateway Flags =
Netif Expire=20
> ::/96 link#2 URS =
lo0=20
> ::1 link#2 UHS =
lo0=20
> ::ffff:0.0.0.0/96 link#2 URS =
lo0=20
> fe80::%lo0/10 link#2 URS =
lo0=20
> fe80::%lo0/64 link#2 U =
lo0=20
> fe80::1%lo0 link#2 UHS =
lo0=20
> ff02::/16 link#2 URS =
lo0
>=20
>=20
> Now, netstat -rn -6 -F1 shows "fe80::1%lo0" which should not be =
there and "fe80::1%lo1" is missing which should be there.
>=20
> Internet6:=20
> Destination Gateway Flags =
Netif Expire=20
> fe80::%lo1/64 link#3 U =
lo1=20
> fe80::1%lo0 link#2 UHS =
lo0
>=20
That seems wrong from my first glance. IIRC, there's HACK ( I'd prefer =
this ) for loopback route. For example
```
# sysctl net.fibs=3D3
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. =20
>=20
>=20
> What output I was expecting was:
> Internet6:=20
> Destination Gateway Flags =
Netif Expire=20
> fe80::%lo1/64 link#3 U =
lo1=20
> fe80::1%lo1 link#3 UHS =
lo1
>=20
>=20
>=20
> 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.
>=20
That is interesting. I can ping without failure.
```
# setfib 1 ping6 -c3 fe80::1%lo1
PING(56=3D40+8+8 bytes) fe80::1%lo1 --> fe80::1%lo1
16 bytes from fe80::1%lo1, icmp_seq=3D0 hlim=3D64 time=3D0.050 ms
16 bytes from fe80::1%lo1, icmp_seq=3D1 hlim=3D64 time=3D0.067 ms
16 bytes from fe80::1%lo1, icmp_seq=3D2 hlim=3D64 time=3D0.096 ms
--- fe80::1%lo1 ping statistics ---
3 packets transmitted, 3 packets received, 0.0% packet loss
round-trip min/avg/max/stddev =3D 0.050/0.071/0.096/0.019 ms
```
Best regards,
Zhenlei
> Thanks in advance.
>=20
> Santiago
>=20
>=20
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">On Jul 13, 2024, at 1:06 AM, Santiago Martinez <<a =
href=3D"mailto:sm@codenetworks.net" class=3D"">sm@codenetworks.net</a>>=
wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D"">
=20
<meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3DUTF-8" class=3D"">
=20
<div class=3D""><p class=3D"">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=3D"">
Please can you advise?<br class=3D""><p class=3D"">I have the =
following setup :</p>
-- two fibs (0 and 1) <br class=3D"">
-- two loop-backs (lo0 and lo1).<br class=3D"">
-- Lo1 has been assigned to fib1<br class=3D"">
--<span style=3D"background-color: rgb(255, 255, 255);" class=3D"">
net.add_addr_allfibs =3D 0</span><p class=3D""><span =
style=3D"background-color: rgb(255, 255, 255);" class=3D"">My
interface output looks like this:<br class=3D"">
</span><span style=3D"font-family:monospace" =
class=3D""></span></p><div class=3D""><span =
style=3D"font-family:monospace" class=3D""></span><br =
class=3D"webkit-block-placeholder"></div><p class=3D""><span =
style=3D"font-family:monospace" class=3D""><span =
style=3D"background-color: rgb(255, 255, 255);" class=3D"">ifconfig lo0 =
|
grep inet6
</span><br class=3D"">
inet6 ::1 prefixlen =
128
<br class=3D"">
inet6 fe80::1%lo0 =
prefixlen 64 scopeid 0x2
<br class=3D"">
</span></p><p class=3D""><span style=3D"font-family:monospace" =
class=3D"">ifconfig lo1 | grep inet6
<br class=3D"">
inet6 fe80::1%lo1 =
prefixlen 64 scopeid 0x3<br class=3D"">
<br class=3D"">
</span></p><p class=3D"">If I do a netstat -rn -6 -F0 I get =
the following which is was i
expected.<br class=3D"">
</p><p class=3D""><span style=3D"font-family:monospace" =
class=3D""><span style=3D"background-color: rgb(255, 255, 255);" =
class=3D"">Internet6:
</span><br class=3D"">
Destination =
&n=
bsp; Gateway
=
&n=
bsp; Flags =
Netif Expire
<br class=3D"">
::/96 =
&n=
bsp; &nbs=
p; link#2
=
&n=
bsp; URS =
lo0
<br class=3D"">
::1 =
&n=
bsp; &nbs=
p; link#2
=
&n=
bsp; UHS =
lo0
<br class=3D"">
::ffff:0.0.0.0/96 =
&n=
bsp; link#2
=
&n=
bsp; URS =
lo0
<br class=3D"">
fe80::%lo0/10 =
&n=
bsp; link#2
=
&n=
bsp; URS =
lo0
<br class=3D"">
fe80::%lo0/64 =
&n=
bsp; link#2
=
&n=
bsp; U =
lo0
<br class=3D"">
fe80::1%lo0 =
&n=
bsp; link#2
=
&n=
bsp; UHS =
lo0
<br class=3D"">
ff02::/16 =
&n=
bsp; link=
#2
=
&n=
bsp; URS =
lo0<br class=3D"">
<br class=3D"">
</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=3D""><br class=3D"webkit-block-placeholder"></div><p =
class=3D""><span style=3D"font-family:monospace" class=3D""><span =
style=3D"background-color: rgb(255, 255, 255);" class=3D"">Internet6:
</span><br class=3D"">
Destination =
&n=
bsp; Gateway
=
&n=
bsp; Flags =
Netif Expire
<br class=3D"">
fe80::%lo1/64 =
&n=
bsp; link#3
=
&n=
bsp; U =
lo1
<br class=3D"">
<b class=3D"">fe80::1%lo0 =
&n=
bsp; link#2
=
&n=
bsp; UHS =
lo0</b><br =
class=3D""></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=3D3</div><div>net.fibs: 2 -> 3</div><div># ifconfig epair =
create</div><div># <span style=3D"caret-color: rgb(0, 0, 0); color: =
rgb(0, 0, 0);" class=3D"">epair0a</span></div><div><span =
style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);" class=3D""># =
ifconfig </span><span style=3D"caret-color: rgb(0, 0, 0); color: =
rgb(0, 0, 0);" class=3D"">epair0a fib 2</span></div><div><span =
style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);" class=3D""># =
ifconfig </span><span style=3D"caret-color: rgb(0, 0, 0); color: =
rgb(0, 0, 0);" class=3D"">epair0a inet6 -ifdisabled =
up</span></div><div><span style=3D"caret-color: rgb(0, 0, 0); color: =
rgb(0, 0, 0);" class=3D""># netstat -6rnF 2</span></div><div><div><font =
color=3D"#000000" class=3D""><span style=3D"caret-color: rgb(0, 0, 0);" =
class=3D"">Routing tables (fib: 2)</span></font></div><div><font =
color=3D"#000000" class=3D""><span style=3D"caret-color: rgb(0, 0, 0);" =
class=3D""><br class=3D""></span></font></div><div><font color=3D"#000000"=
class=3D""><span style=3D"caret-color: rgb(0, 0, 0);" =
class=3D"">Internet6:</span></font></div><div><font color=3D"#000000" =
class=3D""><span style=3D"caret-color: rgb(0, 0, 0);" =
class=3D"">Destination =
Gateway =
Flags Netif =
Expire</span></font></div><div><font color=3D"#000000" class=3D""><span =
style=3D"caret-color: rgb(0, 0, 0);" class=3D"">fe80::%epair0a/64 =
link#5 =
U =
epair0a</span></font></div><div><font =
color=3D"#000000" class=3D""><span style=3D"caret-color: rgb(0, 0, 0);" =
class=3D"">fe80::3b:b3ff:fe8f:9a0a%lo0 link#1 =
=
UHS =
lo0</span></font></div></div><div>```</div><div><br =
class=3D""></div><div>The loopback route always refer the first loop =
interface, aka lo0. </div><div><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D""><p class=3D""><span =
style=3D"font-family:monospace" class=3D"">
<br class=3D"">
</span></p>
What output I was expecting was:
<p class=3D""><span style=3D"font-family:monospace" class=3D""><span =
style=3D"background-color: rgb(255, 255, 255);" class=3D"">Internet6:
</span><br class=3D"">
Destination =
&n=
bsp; Gateway
=
&n=
bsp; Flags =
Netif Expire
<br class=3D"">
fe80::%lo1/64 =
&n=
bsp; link#3
=
&n=
bsp; U =
lo1
<br class=3D"">
<b class=3D"">fe80::1%lo1 =
&n=
bsp; link#3
=
&n=
bsp; UHS =
lo1</b></span></p><p =
class=3D""><br class=3D"">
</p><p class=3D"">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=3D"font-family:monospace" class=3D""><br =
class=3D""></span></p></div></div></blockquote><div>That is interesting. =
I can ping without failure.</div><div><br =
class=3D""></div><div>```</div><div><div># setfib 1 ping6 -c3 =
fe80::1%lo1</div><div>PING(56=3D40+8+8 bytes) fe80::1%lo1 --> =
fe80::1%lo1</div><div>16 bytes from fe80::1%lo1, icmp_seq=3D0 hlim=3D64 =
time=3D0.050 ms</div><div>16 bytes from fe80::1%lo1, icmp_seq=3D1 =
hlim=3D64 time=3D0.067 ms</div><div>16 bytes from fe80::1%lo1, =
icmp_seq=3D2 hlim=3D64 time=3D0.096 ms</div><div><br =
class=3D""></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 =3D 0.050/0.071/0.096/0.019 =
ms</div></div><div>```</div><div><br class=3D""></div><div><div =
style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">Best =
regards,</div><div style=3D"caret-color: rgb(0, 0, 0); color: rgb(0, 0, =
0);">Zhenlei</div></div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D""><div class=3D""><p class=3D""><span =
style=3D"font-family:monospace" class=3D"">
</span></p><p class=3D"">Thanks in advance.</p>
Santiago
<p class=3D""><span style=3D"font-family:monospace" class=3D""><br =
class=3D"">
</span></p>
</div>
</div></blockquote></div><br class=3D""><div class=3D"">
<div><br class=3D""></div>
</div>
<br class=3D""></body></html>=
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