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Date:      Sun, 7 Apr 2024 23:16:47 -0400
From:      Anton Yudin <contact@antonyudin.com>
To:        freebsd-net@freebsd.org
Subject:   How to ignore a default route for one of the dhclient-ed interface?
Message-ID:  <CAAokbZ0t%2BYdU1bjfd%2ByhnTjUw82puWBJHs3rBxwS-%2BkTkERz%2Bg@mail.gmail.com>
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Hello.

  I'm running a FreeBSD 14 with two interfaces that use DHCP.
  I would like to make one of the interfaces to never set the default route.
  Right now the first interface to be fully up sets the default route.

  I tried to set the following in /etc/dhclient.conf
---------------8<------------------------
  interface "wan1" {
      ignore routers;
  }
---------------8<------------------------
  but the default route still gets set.

  I ended up creating a /etc/dhclient-enter-hooks with a very hacky code
that overrides the "route" command:
---------------8<------------------------
route() {
        if [ "X$interface" = "Xwan1" -a "X$2" = "Xdefault"  ]; then
                echo "ignore route $1 $2 $3 $4" | logger -t "enter-hooks"
        else
                /sbin/route $1 $2 $3 $4
        fi
}
---------------8<------------------------

Is there a better way of doing this?

Thanks.

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<div dir=3D"ltr"><div>Hello.</div><div><br></div><div>=C2=A0 I&#39;m runnin=
g a FreeBSD 14 with two interfaces that use DHCP.</div><div>=C2=A0 I would =
like to make one of the interfaces to never set the default route.</div><di=
v>=C2=A0 Right now the first interface to be fully up sets the default rout=
e.<br></div><div><br></div><div>=C2=A0 I tried to set the following in /etc=
/dhclient.conf<br></div><div>---------------8&lt;------------------------</=
div><div>=C2=A0 interface &quot;wan1&quot; {</div><div>=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 ignore routers;</div><div>=C2=A0 }</div><div>---------------8&=
lt;------------------------</div><div>=C2=A0 but the default route still ge=
ts set.</div><div><br></div><div>=C2=A0 I ended up creating a /etc/dhclient=
-enter-hooks with a very hacky code that overrides the &quot;route&quot; co=
mmand:</div><div>---------------8&lt;------------------------<br></div><div=
>route() {<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 if [ &quot;X$interface&quot; =3D =
&quot;Xwan1&quot; -a &quot;X$2&quot; =3D &quot;Xdefault&quot; =C2=A0]; then=
<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 echo &quot;igno=
re route $1 $2 $3 $4&quot; | logger -t &quot;enter-hooks&quot;<br>=C2=A0 =
=C2=A0 =C2=A0 =C2=A0 else<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 /sbin/route $1 $2 $3 $4<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 fi<br>}</=
div><div>---------------8&lt;------------------------</div><div><br></div><=
div>Is there a better way of doing this?</div><div><br></div><div>Thanks.</=
div></div>

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