IP settings on RN214 & entering admin page

If you have admin access to the ISP router, then you can just reset the LAN subnet back to what it was before.  Most routers support IP address reservation (sometimes called ARP binding or MAC address reservation).  If you switch to using that, then you won't lose connectivity to your NAS if this happens again.

If not, there are two other options:

1. Directly connect a PC ethernet port to one port on the NAS.  Set the PC NIC to a static IP address on the old subnet.  Then you will be able to access the NAS admin page.
2. Do a OS reinstall on the NAS using the boot menu, using the procedure on pages 58-59 here:https://www.downloads.netgear.com/files/GDC/READYNAS-100/ReadyNAS_%20OS6_Desktop_HM_EN.pdf  The NAS will be reset to DHCP.  In addition, the NAS admin password is reset back to password, and volume quota is disabled.  You can reset volume quota on the volume settings wheel.  Data will not be lost (though be careful not to do a factory default, which will destroy your data).

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LarsBro wrote:

I made the (now - pretty f...ing obvious) blunder of setting static IP-adresses on both ethernet adapters and it worked stupendously well until my ISP changed my routers IP-address - and hence everything else inside my network.

 

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Normally you don't use both NICs unless you enable ethernet link aggregation (LAG) - sometimes called bonding.  Many LAG modes require a managed switch, although some high-end routers do have LAG support built in.  In any event, no matter what mode you use, you won't see much (if any) performance boost unless you have a lot of clients accessing the NAS simultaneously. My switches do support LAG, but honestly I don't think the gain is worth the bother for a home NAS setup.

If you need to use a static IP address, then I suggest only connecting one NIC to the router (or switch), and leaving the second NIC set to DHCP.  That will also ensure you can connect to the NAS if the subnet changes again in the future (simply by moving the ethernet cable to the other NIC).