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Date:      Thu, 18 Jul 2024 17:48:22 +0200
From:      Santiago Martinez <sm@codenetworks.net>
To:        freebsd-net@freebsd.org
Subject:   Re: Multiple Fibs and INET6
Message-ID:  <D34B5A01-9770-4BCF-B427-796F443303E0@codenetworks.net>
In-Reply-To: <da781b66-4ab3-426f-bf56-f453030c6e61@codenetworks.net>
References:  <da781b66-4ab3-426f-bf56-f453030c6e61@codenetworks.net>
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Hi everyone,
Did anyone had the chance to take a look?
For me it=E2=80=99s a bug but before filling the PR want to know what=E2=80=99=
s your view or if it=E2=80=99s a limitation or bug by design.
Br
Santi


> On 12 Jul 2024, at 19:06, Santiago Martinez <sm@codenetworks.net> wrote:
>=20
> =EF=BB=BF
> Hi Everyone.
>=20
> While adding -F ( fib as used in netstat ) to ping and ping6 I have found s=
omething 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
> ifconfig lo0 | grep inet6
>        inet6 ::1 prefixlen 128
>        inet6 fe80::1%lo0 prefixlen 64 scopeid 0x2
>=20
> ifconfig lo1 | grep inet6
>        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:
> Destination                       Gateway                       Flags     N=
etif 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
>=20
>=20
> Now,  netstat -rn -6  -F1 shows  "fe80::1%lo0" which should not be there a=
nd "fe80::1%lo1" is missing which should be there.
> Internet6:
> Destination                       Gateway                       Flags     N=
etif Expire
> fe80::%lo1/64                     link#3                        U         =
  lo1
> fe80::1%lo0                       link#2                        UHS       =
  lo0
>=20
>=20
> What output I was expecting was:
> Internet6:
> Destination                       Gateway                       Flags     N=
etif Expire
> fe80::%lo1/64                     link#3                        U         =
  lo1
> 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%l0=
1 to fail which I wanted to use as test case.
>=20
> Thanks in advance.
>=20
> Santiago
>=20

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto"><div dir=3D"ltr"></div><div dir=3D"ltr">Hi e=
veryone,</div><div dir=3D"ltr">Did anyone had the chance to take a look?</di=
v><div dir=3D"ltr">For me it=E2=80=99s a bug but before filling the PR want t=
o know what=E2=80=99s your view or if it=E2=80=99s a limitation or bug by de=
sign.</div><div dir=3D"ltr">Br</div><div dir=3D"ltr">Santi</div><div dir=3D"=
ltr"><br></div><div dir=3D"ltr"><br><blockquote type=3D"cite">On 12 Jul 2024=
, at 19:06, Santiago Martinez &lt;sm@codenetworks.net&gt; wrote:<br><br></bl=
ockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF

 =20

    <meta http-equiv=3D"content-type" content=3D"text/html; charset=3DUTF-8"=
>
 =20
 =20
    <p>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>
    Please can you advise?<br>
    <p>I have the following setup :</p>
    -- two fibs (0 and 1)&nbsp;<br>
    -- two&nbsp; loop-backs (lo0 and lo1).<br>
    -- Lo1 has been assigned to fib1<br>
    --<span style=3D"color:#000000;background-color:#ffffff;">
      net.add_addr_allfibs =3D 0</span>
    <p><span style=3D"color:#000000;background-color:#ffffff;">My
        interface output looks like this:<br>
      </span><span style=3D"font-family:monospace"></span></p>
    <p><span style=3D"font-family:monospace"></span></p>
    <p><span style=3D"font-family:monospace"><span style=3D"color:#000000;ba=
ckground-color:#ffffff;">ifconfig lo0 |
          grep inet6
        </span><br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;inet6 ::1 prefixlen 128
        <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;inet6 fe80::1%lo0 prefixle=
n 64 scopeid 0x2
        <br>
      </span></p>
    <p><span style=3D"font-family:monospace">ifconfig lo1 | grep inet6
        <br>
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;inet6 fe80::1%lo1 prefixle=
n 64 scopeid 0x3<br>
        <br>
      </span></p>
    <p>If I do a netstat -rn -6&nbsp; -F0 I get the following which is was i=

      expected.<br>
    </p>
    <p><span style=3D"font-family:monospace"><span style=3D"color:#000000;ba=
ckground-color:#ffffff;">Internet6:
        </span><br>
        Destination &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
Gateway
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Flags &nbsp;=
&nbsp;&nbsp;&nbsp;Netif Expire
        <br>
        ::/96 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&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;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;URS &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0
        <br>
        ::1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#2
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UHS &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0
        <br>
        ::ffff:0.0.0.0/96 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;link#2
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;URS &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0
        <br>
        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;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;URS &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0
        <br>
        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;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;U &nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0
        <br>
        fe80::1%lo0 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&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;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;UHS &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0
        <br>
        ff02::/16 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;link#2
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;URS &n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo0<br>
        <br>
      </span></p>
    Now,&nbsp; netstat -rn -6&nbsp; -F1 shows&nbsp; "fe80::1%lo0" which shou=
ld not be
    there and "fe80::1%lo1" is missing which should be there.
    <p></p>
    <p><span style=3D"font-family:monospace"><span style=3D"color:#000000;ba=
ckground-color:#ffffff;">Internet6:
        </span><br>
        Destination &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
Gateway
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Flags &nbsp;=
&nbsp;&nbsp;&nbsp;Netif Expire
        <br>
        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;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;U &nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo1
        <br>
        <b>fe80::1%lo0 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;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>
        <br>
      </span></p>
    What output I was expecting was:
    <p><span style=3D"font-family:monospace"><span style=3D"color:#000000;ba=
ckground-color:#ffffff;">Internet6:
        </span><br>
        Destination &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
Gateway
        &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Flags &nbsp;=
&nbsp;&nbsp;&nbsp;Netif Expire
        <br>
        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;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;U &nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;lo1
        <br>
        <b>fe80::1%lo1 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; li=
nk#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><br>
    </p>
    <p>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=3D"=
font-family:monospace"><br>
      </span></p>
    <p>Thanks in advance.</p>
    Santiago
    <p><span style=3D"font-family:monospace"><br>
      </span></p>
 =20

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