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Re: [Openvpn-users] New problem with openvpn (formerly up-script problem).


  • Subject: Re: [Openvpn-users] New problem with openvpn (formerly up-script problem).
  • From: Jean-Pierre Schwickerath <lists@xxxxxxxxxxxx>
  • Date: Sun, 5 Dec 2004 17:56:48 +0100

> Logged in as root, I tried typing
> ip link set dev tun0 up mtu 1500
>  and I get the message
> SIOCSIFMTU: Operation not supported by device.
> ( this happens no matter what mtu I type)

Why do you want to set the mtu if openvpn does it for you?


> # ip link show
> 1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueue 
>     link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
> 2: dummy0: <BROADCAST,NOARP> mtu 1500 qdisc noop 
>     link/ether 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
> 3: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
>     link/ether 00:02:e3:13:02:78 brd ff:ff:ff:ff:ff:ff
> 4: eth1: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
>     link/ether 00:02:e3:12:7d:94 brd ff:ff:ff:ff:ff:ff
> 6: ipsec0: <NOARP,UP> mtu 16260 qdisc pfifo_fast qlen 10
>     link/ether 00:02:e3:13:02:78 brd ff:ff:ff:ff:ff:ff
> 7: ipsec1: <NOARP> mtu 0 qdisc noop qlen 10
>     link/ipip 
> 8: ipsec2: <NOARP> mtu 0 qdisc noop qlen 10
>     link/ipip 
> 9: ipsec3: <NOARP> mtu 0 qdisc noop qlen 10
>     link/ipip
> 
> What is wrong here?

I would say your problem is that there is not device tun0. So you can't
set a link mtu on a device that does not exist. 


Jean-Pierre

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