u/No_Jellyfish_6066

So i was trying to get the flag for the med lab of nmap enumeration IDS IPS evasion and no matter waht i try i dont seem to understand why i am not getting the flag. The flag was supposed to be the version of the domain service running on port 53. TCP was closed so had to try UDP which showed the version being "NLnet Labs NSD". The flags i used were "sudo nmap -p53 -sUV -Pn -n --disable-arp-ping --source-port 53 10.129.152.83 -S 10.129.152.80 -e tun0". Now idk what ts is supposed to mean but maybe im missing something. Please dont mind my english im on 4 hrs of sleep and im solving ts after 3 hr college lecture.