This Forum Beta is ONLY for registered owners of D-Link products in the USA for which we have created boards at this time.
Does the absence of the DIR-855 on this list mean that it's not affected? http://www.dlink.com/uk/en/support/support-news/2017/october/18/response-to-krack-wpa2-key-reinstallation-attack-security-vulnerability
Yes
There are others of that generation which either isn't effected or won't be fixed.
Ya, the DGL-4500 is a great old router.
However I use my DIR-890L as a wired AP behind it. Good wireless upgrade. Can upgrade yours sometime as well after the KRACK thing is fixed. Enjoy.