Minecraft Bedrock Hairpin NAT Fails Ping?

yottabit · Mon Jan 23, 2023 5:51 am

This is an odd one. If I add my server LAN IP to the app, the app reports the ping and users online.

But if I use my FQDN which is hairpin-nat'd, the ping stats do not report; yet, I can still connect to the server just fine this way.

Here are the rules I used for hairpin NAT:

/ip/firewall/nat
add action=dst-nat chain=dstnat comment="hairpin 1/3 amp1 udp" \
    dst-address-type=local dst-port=35565-35584 protocol=udp to-addresses=\
    172.16.42.65
add action=dst-nat chain=dstnat comment="hairpin 1/3 amp1 tcp" \
    dst-address-type=local dst-port=35565-35584 protocol=tcp to-addresses=\
    172.16.42.65
add action=masquerade chain=srcnat comment="hairpin 2/3" dst-address=\
    172.16.42.0/24 src-address=172.16.42.0/24
add action=masquerade chain=srcnat comment="hairpin 3/3" out-interface-list=WAN

Any ideas why the ping stats wouldn't work for the fqdn/hairpin, but they do work for the LAN IP? The "ping" is really just a message sent over the same UDP port as used to connect to the game, and since I can still connect to the game, I can't really understand why this doesn't work.

hoanvu99hn · Fri Feb 03, 2023 6:53 pm

If Minecraft does not connect, you can uninstall and reinstall it. Give it a try buddy

yottabit · Sun Feb 05, 2023 9:59 pm

My post has nothing to do with connecting.

Using a short hostname resolving directly to the internal IP shows pings in the client on the same LAN.

Using a fqdn resolving to the external IP does not show pings in the client on the same LAN.

Due to the hairpin NAT rules I have installed, both the short hostname and fqdn connect to the server just fine. It's just that the latter doesn't show pings.

Minecraft Bedrock Hairpin NAT Fails Ping?

Minecraft Bedrock Hairpin NAT Fails Ping?

Re: Minecraft Bedrock Hairpin NAT Fails Ping?

Re: Minecraft Bedrock Hairpin NAT Fails Ping?

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