LogicMachine KNX IP Routing (UDP)

[Tokatubs]

Diagnosed the problem on site and found the issue.

Beckhoff second ethernet port somehow can't receive UDP packages (X101 and X102). First one is working (X001).

Weird thing is that when I send message from Beckhoff side, it will receive it own telegram back (with the second port).

All other parameters are default. TOS, TTL etc...

Now I am back in business..

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Been having same issue. Can read but not write from LM5.

Have tried Wireshark, but have not been able to locate the issue.

What hardware you are using? (IP routers and LM)

Weinzler ip routers, and some Zennio and LM5.

Problem is that its separated in two technical ip networks. 172.16.69.xx and 172.16.70.xx.
The LM5 is located on xx.70.xx range and can read fine from all lines.
Problem is i am not able to write to specially the 69.xx segment.
I dont see any problems on the multicast and udp packages.
Multicast TTL is set to 10 for testing.

If your computer is physically connected to 69.xx segment try to sniff with wireshark. Does LM (xx.70.xx) write packages come thru?
I have experiences with IT guys, they tell you all limitations are removed but still some rules apply.

If packages comes thru then there is problem with ip router I think.

When connected on the 70 i have no problem reaching connections on xx.69. It guys says all is open in between. With my computor. 

I need to do your testing, and connect to the xx.69 and write from the LM connected to the xx.70 segment. And see if wireshark can pick it up. 
Ip routers could be the problem, but i have the problem writing to all of them so i huess problem is located elsewhere. 

Multicast is set up according to IT department. Reading works, so i guess thats partly true..