CS is 27015
all half life games uses that b/c its hl's

if the router's access control has groups then the default group is
all hosts except those listed on the other groups

Group 1: 100-199 members

Group 2: 50-99 members

Group 3: 1-9, 20 members

port 25 is send email
port 110 is receive email
port 80 is browse
port 119 is read net news
port 21 is default for FTP

those are basic ones that i suggest opening if you arent being hacked 24/7

this reminds me, 2 years ago, my comp was under constant attack by anonymous ppl
some how my ip was publisized and made a public target...
24/7 hacking
good thing Lockdown 2001 stopped all of them...
except twice...