We had to use the official Cisco CF memory as the routers were under TAC support and those 256MB cards were always sufficient. I remember that those routers were somewhat picky regarding 3rd party CF cards when people used them for their home labs. S...

Sorry, but this is not possible. The good old 2821 uses ECC DDR (PC2100, 184-pin), while the newer 2900 series uses ECC DDR2 (PC2-5300, 240-pin). I still see no point in going beyond 512MB RAM for such a small setup.

Hello @AKRobert, first of all, the config for your interface Vlan 1000 is correct and should work just fine. Looks like your DHCPv6 server is either not reachable (routing issue, firewall blocking) or not responding (misconfiguration, service not run...

Hello @Shakespeare, the AP is not receiving an IP address via DHCP on its wired uplink, so it cannot proceed to normal operation or CLI configuration. So what is your setup (DHCP, Switch, etc.)? You need to check that your DHCP server and the switchp...

Hello @SamsonOjo, based on the MAC address you are using an Intel NIC and especially those with multiple ports or advanced features (e.g., X710, X550, E810), can present more than one MAC address per physical adapter. Also features like SR-IOV or cer...