Sometimes NAT Loopback Stops Working
I'm relatively new to Eero. I have 3 Eero Pro units. I have several ports forwarded to internal devices and use a dynamic DNS service, and I rely on NAT loopback (I think also called hairpinning) so I only need to use the external dynamic hostname no matter where I am (inside or outside of my network).
Occasionally, from inside the network, I can no longer access those forwarded ports using the external hostname/IP. From outside the network, it always works fine. And yes, I'm sure that I'm using the correct external IP.
The strange thing is, the problem pops up and then disappears on its own. Sometimes it only affects some forwarded ports and not all. Sometimes the problem only occurs from one device on my internal network and works fine from another.
I had a Linksys Velop mesh wifi system and a few other routers before that which never had this issue.
This problem was more frequent before some of the firmware releases back in the late summer of 2018. I RARELY have it happen any longer. However, I access about 90 internal devices via host names that are resolved externally, and say 1 time out of a hundred I find the ports are blocked these days versus maybe 1 out of 10 in the past. Rebooting the entire system corrects the issue, but like I said, the issue used to be far more common early last year.Reply
I'm having the same problem. It seems like every 3-4 weeks, it starts failing. I have to reboot the routers. I know rebooting the routers is not a huge deal. But it is an issue when other people are using the network. I have to wait until another time to do this. Are there any plans to look into this issue and address it once and for all?Reply
I am also seeing this right now.
Works fine when I use a different network (e.g., turn on my VPN).
In the Eero app's advanced networking page, provide a setting called "Test Hairpin" - would this would do is, say,
1. Set the Eero mesh itself to respond to an http request on some high port
2. Have the Eero mobile app, when on its own network, request the page via the external IP
3. Now, if the Eero mobile app can't get a 200 from that http request, hairpin is failing
4. It could then report the fail to Eero HQReply