The DD-WRT firmware you have installed on the router may not have logging compiled-in, or it is disabled because of insufficient disk-space or RAM. You may need to use an alternate method of logging the messages on your computer via the network. See the following articles for some alternative ideas :

Network Time Protocol - DD-WRT Wiki To configure the NTP client, log into the router and go to "Setup" > "Basic Setup" > "Time Settings". Now: 1) Select "Enable" next to NTP Client 2) Choose the appropriate Time Zone for your area Note: A time server is hard-coded into the DD-WRT firmware. If you enable the NTP Client (that's the default setting) but leave the Server IP/Name How To Log Into DD-WRT Router For the First Time Aug 11, 2018

Logging with DD-WRT

DD-WRT is a custom firmware for routers, it offers OpenVPN protocol support and is available on a wide variety of routers. You can check if your router supports DD-WRT firmware here. An article on how to install DD-WRT firmware on a router can be found here. [DD-WRT] Logging utilities - Linksys | DSLReports Forums Nov 04, 2008 logs - DD-WRT DNSMasq logging help - Unix & Linux Stack

- *.bin files can only be flashed from dd-wrt webif. - *.chk can be flashed from Netgear factory fw and from dd-wrt webif - I don't provide factory to dd-wrt for non Netgear models since I do not own any non Netgear Broadcom units. All builds include ddup util, which allows update checking and flashing of the following models: Netgear EX6200

Linksys DD-WRT Default Router Login and Password Find the default login, username, password, and ip address for your Linksys DD-WRT router. You will need to know then when you get a new router, or when you reset your router. Telnet/SSH and the command line - DD-WRT Wiki The DD-WRT firmware can use user/pass logon or only allows connections from clients whose public keys are manually entered via the web interface. Multiple keys can be entered by placing them on separate lines. If you want to use user/password to login using SSH use user "root" with the password you set in the webinterface Network Time Protocol - DD-WRT Wiki