Re: 'RTNETLINK answers: File exists' error

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On 3/10/21 1:52 AM, Marco Gaiarin wrote:
> Sometime in my firewall (based on debian), using my custom script=20
> and with policy routing enabled, i hit this error:
>=20
>   ifup vlan191
>   Set name-type for VLAN subsystem. Should be visible in /proc/net/vlan=
/config
>   Added VLAN with VID =3D=3D 191 to IF -:eth2:-
>   RTNETLINK answers: File exists
>   Failed to bring up vlan191.

That means that the kernel thinks that the route / interface that you=20
are, or the script on your behalf is, trying to create already exists.

> this typically happen when i 'play' with an interface (eg, i tear it=20
> up and down many times for testing); after a bit of play (but something=
=20
> suddenly) the interface go into a undefined state; interface is up (eg,=
=20
> 'ifconfig' return the correct data) but routing is a mess.

*nod*

Been there.
Done that.

> Sometime the only thing to do is reboot the firewall.

Na.  You generally shouldn't need to reboot.

> Probably i do something wrong in my script, but... how can i 'cleanup'
> the mess without rebooting?

In between script invocations, check to make sure that any VLAN=20
interfaces you are messing with have been removed and that any Ethernet=20
interfaces are down.

Doing that should remove any routes associated with them and remove the=20
interfaces so that you / the script can start anew when creating them.



--=20
Grant. . . .
unix || die


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