On Tuesday, 30 August 2011, DialToneApps <[email protected]> wrote: > Correction: InetAddress.isReachable() does not 'send the ICMP ECHO'.
>From the API docs of InetAddress: "public boolean isReachable (int timeout) Tries to reach thisInetAddress. This method first tries to use ICMP (ICMP ECHO REQUEST). When first step fails, a TCP connection on port 7 (Echo) of the remote host is established." > It tries to work around the Android/Java limitation of not being able > to craft and send an ICMP packet by > 1) Sending a tcp connect on the echo port (port 7) > 2) Recognizing a response (any response whether a successful connect > OR a reset) as an indication that the destination exists > At best this is a hack. Port 7 is generally not allowed by firewalls > and therefore this method rarely works for hosts outside your own > subnet. The only way (as far as i know) to 'ping' in non-rooted > standard-issue Android is by using the command-line 'ping' utility. > I would love to know other ways of pinging if anyone else knows. Telneting to a set of known ports perhaps? > > On Aug 24, 10:59 am, Daniel Drozdzewski <[email protected]> > wrote: >> On 18 August 2011 20:39, Luiz Carvalho <[email protected]> wrote: >> >> > Hello Guys >> >> > I've got a problem. >> > I can't run ping on emulator, even rooted, only in my Galaxy 5. >> >> > Using this procedure: >> >> > proc = Runtime.getRuntime (). exec ("su"); >> > DataProc = new DataOutputStream >> > DataOutputStream (proc.getOutputStream ()); >> > dataProc.writeBytes ("exec pingwww.google.com-c2 \ n"); >> >> > I get the response in the device, but in the emulator no have >> > answers. >> >> > I need of the statistics generated by ping. >> >> > Can anyone help me? >> >> Is there some spacing issue in your command line: "-c 2" ? >> >> There is much better solution: >> >> use InetAddress.isreachable(). It does send the ICMP ECHO (i.e. ping). >> >> You can get your stats by timing this call (or multiple calls). >> >> -- >> Daniel Drozdzewski > > -- > You received this message because you are subscribed to the Google > Groups "Android Developers" group. > To post to this group, send email to [email protected] > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/android-developers?hl=en -- Daniel Drozdzewski -- You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en
