Now, a few days ago, I switched to VDSL and got a new router: a Speedport W920V.įirst thing I did was to put it into modem-mode. After disabling the filter the device worked flawlessly in modem-mode. This firmware had an option to disable the PPPoE-Filter. I put the Speedport back into router-mode at this point and, who would have guessed it, SOA requests worked fine again.Īfter fruitless discussions with Deutsche Telekom support (it was impossible to find anyone who even remotely understood what I was talking about) and sending a bug report to AVM (the 701V actually is a FRITZ!Box) which never got an answer, I finally solved the problem by putting a Freetz firmware on the Speedport. Sending requests to my own name server ( host -t soa ns.) and tracing DNS there showed that no packet ever arrived. It turned out that all SOA request got blocked somewhere. After some network tracing I found out that the Apple machine sent DNS SOA requests but never got a reply back. That happened a few days later when I tried to use Apple’s Back to My Mac - it just didn’t work. I didn’t really connect the dots at this point, though. This setup had worked fine with other modems but shortly after switching to the Speedport I noticed that my local caching DNS server didn’t work correctly anymore.
I set it up in modem-mode and let a small Linux box handle everything else. Some years ago I switched to using a Speedport W701V from Deutsche Telekom on my ADSL line at home.
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