[Iftop-users] Forwarded bug reports from Debian

[Markus Koschany]

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On Mon, 18. Nov 16:03 Paul Warren <pdw@ex-parrot.com> wrote:
[...]
> On 13/11/2013 11:05, Markus Koschany wrote:
> >1. iftop does not notice changes to ppp interfaces and stops refreshing
> >    its output http://bugs.debian.org/543138
>
> Does anyone know how to detect when this happens?  It's obviously
> not treated as an error by pcap_loop() when it happens.

Unfortunately no. Perhaps there are some hints in ifconfig's source
code. I could also imagine some buffer that stores the amount of
captured packages. If the amount equals zero in a given time frame, one
may assume that the device is down and a restart of iftop's capture
process necessary. This could be a special option or mode, so that
people have to choose it explicitly.


> >2. iftop: chooses eth0 as the default interface instead of the default
> >    route http://bugs.debian.org/644998
> >
> >The code could be changed in two ways:
> >   * Only consider interfaces with routes associated with them.
> >   * Prefer the interface with a default route to other ones.
>
> This is a great idea, but what's the easiest way to identify these
> interfaces programmatically?

Perhaps you could use a command like

ip route show 0.0.0.0/0

The last output argument is the device with the default route associated
to it.

An alternative might be to display all available interfaces at startup
and let the user choose the interface herself. (only a small improvement
over the -i option but this should definitely work)

Regards,

Markus

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