nixCraft 🐧
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
....
..
Jul 16, 2023 at 7:35pmWeb
Show threadMathiasJul 16, 2023
@nixCraft It's always DNS?
Show threadリーハイJul 16, 2023
@matthegap @nixCraft Most likely DNS. 
Show threadTheJasonThomsJul 17, 2023
@matthegap @nixCraft insert DNS Haiku here.
Show threadHarald HannelїusJul 16, 2023
@nixCraft mtu issue. Pmtu blocked by some firewall.
Show threadschrotthaufenJul 16, 2023
@nixCraft I don’t think I’ve ever seen a route that actually exceeds 255 hops. So… routing loop?
Show threadSige 😺Jul 16, 2023
@nixCraft is it a loop somewhere?
Show threadcid_terronJul 16, 2023

@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)

Show threadDouglas KilpatrickJul 16, 2023
@nixCraft Routing loop I'd assume? "mtr" up next?
Show threadsoundstripeJul 16, 2023
@nixCraft routing loop?
Show threadUser01Jul 16, 2023
@nixCraft
That's a routing loop. Your time to live (TTL) is being decreased until one router in the path sends a time out back to you.
Show threadPendaran the PoetJul 16, 2023
@nixCraft DNS resolves OK; the echo responses are a duplicate (icmp_seq=6) – link level failure. Another host has the same IP? ARP table scrambled?
Show threadDiabolic PreacherJul 17, 2023
@nixCraft yamraj is coming to take you... it was nice knowing you.