BUG: Client crashes when server reply comes from a different IP address
than that to which the initial packet had been sent. Fixed.
BUG: SIG_CHLD set to SIG_IGN but wait() used. Fixed. SIG_IGN was removed.
connectivity with CHECK_REQs. (see refresh option in dhid.conf.sample)
1) OnCmd and OffCmd options now are executed with the hostid parameter,
the local IPv4 dynamic IP address and additional parameters specified
in dhid.conf