Hi Mark, Oops, sorry I misunderstood the conversation.
Cheers, Peter On 29/02/2012 10:15 PM, Mark Wendt wrote: > Peter, > > I was referring to Kirk's not seeing port 1502 after he assigned it in > the loadusr statement, and how the OS handles ports above 1024. > > Mark > > On 02/29/2012 06:07 AM, Peter Homann wrote: >> Hi, >> >> Port 502 is assigned to Modbus, so that's what slaves should use by default. >> >> Cheers, >> >> >> Peter. >> >> On 29/02/2012 9:40 PM, Mark Wendt wrote: >> >>> On 02/28/2012 05:21 PM, Kirk Wallace wrote: >>> >>>> ... snip >>>> >>>> I think I know a little more now. I was able to bring up >>>> "loadusr classicladder --modslave" (I didn't know the rt component had >>>> to be loaded too). My netstat returned the same result above with >>>> "0.0.0.0:9502". I then did a ifconfig to find my network computer's >>>> addresses with 192.168.1.10 (eth0) and 127.0.0.0 (localhost) being >>>> listed. I nmap both addresses and found port 9502 open on both, so it >>>> seems by default, "--modslave" will listen on all addresses (two in this >>>> case), with "all or any addresses" being called out as "0.0.0.0". >>>> http://en.wikipedia.org/wiki/0.0.0.0 >>>> >>>> If I use "loadusr classicladder --modslave --modbus_port=1502" netstat >>>> sees port 1502 as listening, nmap doesn't see it whereas it did see 9502 >>>> previously. My guess is that as any ports above 1000 have lighter >>>> restrictions, maybe ports above a higher value are handled differently >>>> too, so 1502 doesn't show where 9502 does. I guess I have more work to >>>> do. >>>> >>>> I haven't tried connecting to the LinuxCNC slave with a master yet. >>>> >>>> >>> Actually, ports 1024 and below are considered "privileged" ports. Any >>> ports above that are considered "non-privileged" ports and are all >>> treated the same. Do a 'netstat -a | grep 1502' and see if the 1502 >>> port shows up. >>> >>> Mark >>> >>> >>> ------------------------------------------------------------------------------ >>> Virtualization& Cloud Management Using Capacity Planning >>> Cloud computing makes use of virtualization - but cloud computing >>> also focuses on allowing computing to be delivered as a service. >>> http://www.accelacomm.com/jaw/sfnl/114/51521223/ >>> _______________________________________________ >>> Emc-users mailing list >>> Emc-users@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/emc-users >>> >>> >> > > > ------------------------------------------------------------------------------ > Virtualization& Cloud Management Using Capacity Planning > Cloud computing makes use of virtualization - but cloud computing > also focuses on allowing computing to be delivered as a service. > http://www.accelacomm.com/jaw/sfnl/114/51521223/ > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- ----------------------------------------------------------------------------- eStore: http://www.homanndesigns.com/store Web : http://www.homanndesigns.com ModIO - Modbus Interface Unit email : pe...@homanndesigns.com DigiSpeed - Isolated 10Vdc I/F Phone : +61 421 601 665 TurboTaig - Taig Mill Upgrade board ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
