Can you guess what went wrong?
```
ping ec2.app-in-mum-49
```
Here is what I get:
PING ec2.app-in-mum-49 (23. xx. xxx .xxx) 56(84) bytes of data.
From 10.204.35.30 (10.204.35.30) icmp_seq=6 Time to live exceeded
From 10.204.35.30 (10.204.35.30) icmp_seq=6 Time to live exceeded
....
..

@nixCraft was the TTL too low from the beginning? (I remember the default to 1 times in the Intranet)

Then I had a SBC or router manipulating it to 1

And also funny: the default gw Magic
Default gw on switch1 is switch2 and
Default gw on switch2 is switch1.
(Can be extended to more switches of course)