Asus RT-AC87R AC2400 Dual Band Wireless Gigabit Router flash

ASUS RT-AC87R Wireless-AC2400 Dual Band Gigabit Router Asuswrt-Merlin is a third party alternative firmware for Asus routers, with a special emphasis on tweaks and fixes rather than radical changes or collecting as many features as possible. Features
With a few rare exceptions, Asuswrt-Merlin retains the features from the original stock Asus firmware. In addition, the following features have been added or enhanced:
System:

Various bugfixes

Performance optimizations to some CPU-bound components like OpenVPN

Some components were updated to their latest versions, for improved stability and security

 that run on specific events such as firewall restart

 for scheduled tasks

 for router services

Third party software through 

, with an easy setup script

SNMP support (some models)

Nano text editor (for more user-friendly script editing)

NTP daemon, which can synchronize your client devices

Third-party addons, with a management interface 

Disk sharing:

Optionally use shorter share names (folder name only)

NFS exporting of USB drives

Networking:

Act as a SMB Master Browser

Act as a WINS server

SSHD support for key-based authentication

Allows tweaking TCP/UDP connection tracking timeouts

CIFS client support (for mounting remote SMB share on the router)

Advanced OpenVPN client and server.

Netfilter ipset module, for efficient blacklist implementation

Wireless site survey page

, enforcing a specific DNS server, can be applied globally or per client

 (through a user script)

TOR support, individual client access control

 for OpenVPN clients (based on source or destination IPs), sometimes referred to as "selective routing", or "split tunneling")

 validation

 for Traditional QoS

Detailed wireless troubleshooting information (on some models)

Redirect NTP client queries to the router's own NTP daemon

 QoS (on newer HND models)

Web interface:

Performance improvements

Optionally save traffic stats to disk (USB or JFFS partition)

Enhanced traffic monitoring: adding graphical charts, and traffic monitoring per client IP

Hostname field on the DHCP reservation list and Wireless ACL list

System info summary page

Wifi icon reports the state of both radios

Wireless site survey

Advanced Wireless client list display, including automated refresh

Redesigned layout of the various System Log sections

Editable entries (on some pages)

Some features first debuted in Asuswrt-Merlin and were eventually implemented in the official firmware:

HTTPS configuration interface

Persistent JFFS partition

LED control - put your router in Stealth Mode by turning off all LEDs

Turning WPS button into a radio on/off toggle

Clicking on the MAC address of an unidentified client will do a lookup in the OUI database.

WakeOnLan web interface (with pre-configured targets)

Display active/tracked network connections

VPN Status page

DualWAN and Repeater mode (while it was still under development by Asus)

Basic OpenVPN (client and server) support

Configurable IPv6 firewall

Improved compatibility with 3TB+ and Advanced Format HDDs

SSH access

Disk spindown after user-configurable inactivity timeout

Updated Samba version (3.6), with SMB2.0 support

TLS 1.3 support for some services (OpenSSL 1.1.1)

Modern DDNS client (

), with https support

Full cone NAT support (on some models)

User-provided SSL certificate

Display the Ethernet port states

TLS support for the FTP server

Allow or disable WAN access to the FTP server

User-defined options for WAN DHCP requests (required by some ISPs)