I get a lot of SSH brute-force attack attempts on my server (where authentication is done via a private key anyway), so it's no surprise to me that your server has been port scanned and now your telnet gets a lot of attention.
The best way to end with this pesky issue once and forever is to set the telnet host on your bot to the IP or lis of IP you trust. If you look at *.user (where * is what you set in eggdrop.conf file at
set userfile line), for example LamestBot.user (in my case) you should see at the top of your user a line like this:
that basically translates it will accept a telnet connection from anyone (the * behind @ means everyone). So, if you change that line for example to:
then it will accept a telnet connection ONLY from 1.2.3.4, and any other IP connection is dropped.
Once the game is over, the king and the pawn go back in the same box.