DD-WRT is a third party developed firmware released under the terms of the GPL for many ieee802.11a/b/g/h/n wireless routers based on a Broadcom or Atheros chip reference design. To see a full description of What is DD WRT, understand its features, it versions, I suggest this site:

Jun 04, 2008 DD-WRT – Wikipedia tiếng Việt DD-WRT là firmware dựa trên Linux dành cho các loại router không dây và access point.Ban đầu nó được thiết kế cho dòng Linksys WRT54G, và hiện nay đã được sử dụng trên nhiều model khác. DD-WRT là một trong nhiều dự án firmware của bên thứ ba, dùng để thay thế firmware gốc của nhà sản xuất bằng firmware tùy chỉnh với How to Use DD-WRT Router as Wireless Adapter – Client Mode Sep 13, 2014

This router was running dd-wrt.v24-10600_NEWD_nokaid.bin and wget was not working (probably not included in busybox) After flashing it with mini it DID work.

Jul 14, 2015 DD-WRT

Broadcom Nokaid Generic Too Large for - svn.dd-wrt.com

Well, one of the many strengths of DD-WRT is that it is a versatile platform which can be used to repurpose your router, and one of the most useful things you can do with an old router it into a wireless repeater! We've covered this, and much more in our Definitive DD-WRT Guide.