Re: gnugk must be restarted to recognize interface is turned off/on

thank you Jan for your technical explanation and solution. KILL command
solve my problem:)

SAM

On Sun, Mar 27, 2016 at 9:10 PM, Francisco Olarte <[email protected]>
wrote:

> Hi Jan:
>
> On Sun, Mar 27, 2016 at 4:38 PM, Jan Willamowius <[email protected]>
> wrote:
> > the technical reason why GnuGk doesn't automatically recognize new
> > interfaces is that it listens to each IP bound to your interfaces
> > individually instead of listening to inaddr_any (0.0.0.0). GnuGk needs
> > to do so to get full control over the IP address used for sending
> > messages.
>
> IIRC there is a trick ( I think I first saw it on ntpd, so UDP,
> although I think it works in TCP too ) to react to IP changes and hava
> control of the source address. You start with a socket bound to the
> wildcard address ( i.e., 0.0.0.0:1719 ), and, when a packet is
> received you look at the destination address ( which is your local
> address ) and bind another socket to this if needed ( let's say to
> 192.168.1.1:1719 ) and use it for replies, and from there to receive
> packets. setsockopt(IP_PKTINFO) and recvmsg where needed in the socket
> used at the wildcard address, normally with a little layer to hide the
> fact that the first acket for a transport address did not come from
> the same socket which later was associated with it,  and some flags
> where needed to have the binding survive interfaces coming up/down,
> but the nice thing was that it totally abstracted the details of
> interfaces and let you work with just transport addresses. I think
> this works in linux, not sure about the other os though.
>
> Francisco Olarte.
>
>
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