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Groups > comp.lang.java.programmer > #39641
| From | Knute Johnson <nospam@rabbitbrush.frazmtn.com> |
|---|---|
| Newsgroups | comp.lang.java.programmer |
| Subject | Re: InetAddress.isReachable() ? |
| Date | 2020-10-23 19:38 -0500 |
| Organization | A noiseless patient Spider |
| Message-ID | <rmvt2a$nt2$1@dont-email.me> (permalink) |
| References | <rmv1lf$pmq$1@dont-email.me> <rmv31v$vvl$1@gioia.aioe.org> <rmvnsi$1dn$1@dont-email.me> <rmvsjs$1h20$1@gioia.aioe.org> |
On 10/23/2020 19:30, Arne Vajhøj wrote: > On 10/23/2020 7:10 PM, Knute Johnson wrote: >> On 10/23/20 12:14 PM, Arne Vajhøj wrote: >>> On 10/23/2020 12:50 PM, Knute Johnson wrote: >>>> InetAddress.isReachable() only works if I run Java as root. Any >>>> idea how to make it work with a regular user? The docs say "A >>>> typical implementation will use ICMP ECHO REQUESTs if the privilege >>>> can be obtained". I'm assuming that's why it won't work as a >>>> regular user. >>> >>> Is it worth it? >> >> Yes > > OK. > >>> The method can return false and the service you want to use >>> can be available (firewall blocking ICMP and Echo but not application >>> protocol). >> >> No firewalls there. >> >>> The method can return true and the service you want to use >>> can be unavailable (OS running but server application down). >> >> No service to connect to. Just want to see if there is a path to the >> router. >> >>> I think you would be better of connecting to the service >>> you want to use and handle errors there. >> >> Again no service to connect to. >> >> It's an internal network and I'm fielding calls all the time that 'we >> aren't getting updates to our data'. If I can ask is the little box >> green or red I'll know with some certainty the status of their network >> connection. I'm 1600 km from the site so I can't just pop over for a >> look see. I can't ask them to ping the router, that's a step too far. >> The network service at the remote sites is interrupted on a fairly >> regular basis. >> >> So yes I would really like to figure out how to make this work is it >> is possible. > > I cannot believe there are any ways to get around the privilege issue. > > If there were then it would be a bug that would be fixed. > > That leaves you with the awful hack of running the external > ping command and read output. > > Arne > That's what I was afraid of Arne. Oh well, I didn't have anything else to do this week :-).
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InetAddress.isReachable() ? Knute Johnson <knute2020@585ranch.com> - 2020-10-23 11:50 -0500
Re: InetAddress.isReachable() ? Arne Vajhøj <arne@vajhoej.dk> - 2020-10-23 13:14 -0400
Re: InetAddress.isReachable() ? Knute Johnson <knute2020@585ranch.com> - 2020-10-23 18:10 -0500
Re: InetAddress.isReachable() ? Arne Vajhøj <arne@vajhoej.dk> - 2020-10-23 20:30 -0400
Re: InetAddress.isReachable() ? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2020-10-23 19:38 -0500
Re: InetAddress.isReachable() ? Martin Gregorie <martin@mydomain.invalid> - 2020-10-24 11:45 +0000
Re: InetAddress.isReachable() ? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2020-10-29 15:23 -0500
Re: InetAddress.isReachable() ? Martin Gregorie <martin@mydomain.invalid> - 2020-10-29 21:36 +0000
Re: InetAddress.isReachable() ? Arne Vajhøj <arne@vajhoej.dk> - 2020-10-29 21:47 -0400
Re: InetAddress.isReachable() ? Knute Johnson <knute2020@585ranch.com> - 2020-11-01 10:30 -0600
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