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Author Topic: ZyXEL VMG 1312-B10A - http server not responding  (Read 203 times)

Weaver

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ZyXEL VMG 1312-B10A - http server not responding
« on: July 15, 2018, 06:33:45 AM »

One of my modems is sulking after I abused it in some way. I did something or other to it and managed to make DNS within the modem work for the first time ever. I don't know how I did it though. I was also trying to set default gateway IPv4 and IPv6 addresses for the LAN interface. Also I tried to get IPv6 fully configured, as it says it has IPv6 capabilities and was showing a valid mac-derived feff link-local IPv6 address on one of the interfaces. I got DNS working by [somehiw] setting a DNS server entry in the modem to point to an IPv4 addresses of my router, a Firebrick. I should be able to also get DNS working in the modem using link-local IPv6 only.

But anyway, at some point the http server stopped working. It still talks to the internet as normal. Telnet works. I rebooted it using the appropriate command in telnet, but that did not fix it. Telnet still works.

Is there a way of recovering it without the nuisance of having to reset back to factory settings?

I have the config backed up of course. I don't have a TFTP app on my ipad, otherwise I believe I could push a replacement config into the modem using TFTP initiated from a Telnet command?

I know I can wipe the device and so forth, but that means a lot of messing around as once it is reset, 192.168.1.1 will not work unless I either temporarily reconfigure the router or ask my poor wife to start swapping cables about twice, which will get me into trouble. So I was hoping there is some slick trick I can use from Telnet.
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burakkucat

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Re: ZyXEL VMG 1312-B10A - http server not responding
« Reply #1 on: July 15, 2018, 06:14:24 PM »

Oh dear. As a fellow scientist, I have to say that you seem to have forgotten the one basic principle for any experiment . . . Change one variable at a time. Hence N variables implies, at least, the minimum of N separate experiments.

I have one suggestion that you could try --

Power down the VMG1312-B10A and leave it in that state for, say, five minutes. Then power it back on.
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Weaver

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Re: ZyXEL VMG 1312-B10A - http server not responding
« Reply #2 on: July 15, 2018, 07:09:12 PM »

You are of course quite right. In this case, I had no chance though, because there was nothing to tell me that I had actually wrecked the http server at some point by poking around in the CLI. I was just so pleased that I managed to get it perform DNS lookups successfully itself for the first time, goodness knows exactly how.

I have several spares, so the 80%-bricked one is labelled and in the ZyXEL spares cupboard waiting for the next lightning strike. But I really need to sort it out somehow well before that day, otherwise I am bound to simply forget about that job on my list.
« Last Edit: August 03, 2018, 05:37:49 PM by Weaver »
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Weaver

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Re: ZyXEL VMG 1312-B10A - http server not responding
« Reply #3 on: August 03, 2018, 05:35:27 PM »

Our very own Johnson has very kindly inspected the modem and it seems it recovered on its own. What a fool I am.  :-[  I should of course have checked what the effect of an extended period deprived of power might do. He is a hero. And what is worse, Burakkucat told me to do this, but I was in such a fuddle that I got confused. So praise due to Burakkucat too.
« Last Edit: August 03, 2018, 05:39:48 PM by Weaver »
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