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Bug#757711: Bug#757988: kfreebsd: troubles with dhcp (configuration going away)

On 13/08/14 18:05, Cyril Brulebois wrote:
> What I'd like to get figured out is what changed between images that
> weren't hitting this problem, and the newly published ones.

What changed is dhclient from isc-dhcp-client-udeb gained a signal
handler that responds to SIGKILL by releasing the DHCP lease and
deconfiguring the interfaces.  I've just tested that the version in
wheezy d-i didn't trap the signal;  Linux udhcpc doesn't either.

This is a 'feature' introduced in ISC DHCP 4.3.0, which first reached
testing on 2014-07-16;  I've tested that d-i Alpha 1 wasn't affected by
this bug (dhclient is killed but the interface stays configured) :

> @@ -681,6 +692,10 @@ main(int argc, char **argv) {
>         dmalloc_outstanding = 0;
>  #endif
> +        /* install signal handlers */
> +       signal(SIGINT, dhcp_signal_handler);   /* control-c */
> +       signal(SIGTERM, dhcp_signal_handler);  /* kill */
> +

Either way, netcfg killing the DHCP client seems wrong to me, because
I'd expect the kind of issues Philipp Kern described;  if you're going
to use DHCP, you ought to renew your lease and not let it expire?

Steven Chamberlain

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