Hello Howard,
It seems that I can only RTPing local interface and If I added a host route entry for my WLAN gateway, it seems reachable using RTPing - Is this true? I am wonderring if I did right.
this is ok.
RTnet will not automatically resolve unknown IP addresses. You have to add the routes (comparable to ARP entries on normal systems) manually, trigger a resolution via "rtroute solicit", or use RTcfg to exchange this information. This way, unplanned address resolution packets cannot disturb real-time communication. Remember, it is a hard real-time stack!
Can a normal TCP/IP host respond back the RTping?
Since RTping AFAIK sends standard ICMP ping packets, every IP stack supporting ICMP should send a response.
Yep.
However it still seem that I can not reach the outside even though I added some net route entry? Is there a option to add a default gateway entry in RTRouting table same as route in Linux?
Yes, you can set up so-called network routes, see README.routing. Switch on the respective feature and use rtroute again, now providing a network address and mask as destination.
So in RTnet, the protocol has to be Realtime UDP/IP protocol (or raw socket API) to communicate with outsdie machine (those non-RTnet machines)?
You should not directly communicate with non real-time machines using the RTnet API.
...only for testing purposes. :)
If I want to use regular TCP/IP socket communication, does that means I have to use LXRT and user space interface? after the start up of the standalone RTNET machine, ( I did it mannually, seem only the local loop works for RT) How can I make the regular linux TCP networking work, I tried to use ifconfig to bring up the rteth0 interface and add some route as well. It seems I can not reach the outside world - some filter warning.
To communicate with machines outside your real-time network, you should configure the non real-time virtual nic "vnic0" in linux using ifconfig. This virtual nic is provided by RTmac and encapsulates your non real-time linux communication for sending it over the real-time network. For linux the virtual nic is just like a usual network card.
Have a look at the PDF file attached to this email.
Looks cool!
@HaPe: Can you mail me the vector graphic? I would like to make a small image out of it for the documentation page. Gives a really nice overview of a typical RTnet network segment!
Jan
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