Wireshark · Ethereal-users: Re: [Ethereal-users] X11 problem /Ethereal interface

[Justin Walker <justin@xxxxxxx>]

On Friday, March 12, 2004, at 06:58 PM, PRC-2000 wrote:

> I was getting the same error below until I re-installed X11 from the 
> Mac OS
> X Panther CD #3.
>
> Gtk-WARNING **: cannot open display: :0.0
>
>
> Now, when I launch Ethereal, and try to select the interface (Airport 
> Card,
> eth1) I get the following error:
>
> The capture session could not be initiated ((no devices found) 
> /dev/bpf0:
> Permission denied). Please check to make sure you have sufficient
> permissions, and that you have the proper interface or pipe selected.
>
> There are no interfaces to choose from when I press Ctrl+K.

As the error message tells you, check to make sure you have sufficient 
permissions.  Are you running as root?  In order to open the packet 
filter devices (bpfn), you have to either be the owner, be root, or the 
permissions have to be set so that "other" can read them (which is not 
recommended).  Since these devices are generally owned by root (and 
it's not recommended to change that), you have to be root to read them.

Regards,

Justin

--
Justin C. Walker, Curmudgeon-At-Large  *
Institute for General Semantics        |    Men are from Earth.
                                       |    Women are from Earth.
                                       |       Deal with it.
*--------------------------------------*-------------------------------*