It always is:
- DNS
- MTU or MSS
- ICMP type 11 being eaten
- TLS
- undisclosed routing loop
nostr:note1aml7sddxqtxw7s53k4at6zxkp75eq8twfp8al8ar05alqqhg64gsn0dhef
Don't forget BGP
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I guess you covered routing ๐
If itโs MTU but not MTU then itโs ICMP type 11.