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[Weaver]

[mrk26]

It's totally pain if you do this while modem is connected to your network. I did one of these connected to laptop through lan cable, and from this what I remember it does indicate when process start and when ends. Also I had file already in my laptop so was just a matter to upload to modem. It could be issue if your modem downloading fw from servers as will not start programing until download is completed. I know maybe is not solution but best way do them one by one individually with cable connected only.

P. S
I hope you mean zyxel VMG1312-B10A, if not ignore my post.

[tubaman]

I think the issue is that these are consumer devices and made with the assumption that it'll be sat in front of the user during the update. As it does a full reboot following the update there is no way it can keep hold of any TCP connections at that point. My experience with my VMG8924-B10A is that the user config doesn't change the vast majority of the time.
 

[Weaver]

Really they need some kind of post-boot posted job schedule (posting means deferring a procedure call till later, a bit like setting a timer but instead triggered to run as soon as it can be) which includes temporarily setting the network config so they can keep talking to the user so that way they can remake the TCP connection. Also need to prompt user as to when to change IP address range, exactly when.

[burakkucat]

Subject line now adjusted to reflect the correct ZyXEL device, thanks to mrk26's observation.

[Alex Atkin UK]

Honestly this has been one of my bug bears, especially with Windows.  Even if using DHCP, if you change the IP range, unplugging and plugging back in the ethernet cable doesn't seem to always trigger a DHCP refresh.  Changing the IP manually more often that not seems to refuse to take.