??Linux????β?CC??????

???????????? ???????[ 2013/5/14 10:09:18 ] ????????

????????CC??????CC?????????????????????????????????????????????????????????????????????????????ж???CC?????????????????????ЩLinux???ж?CC?????????

??????????80??????????

????netstat -nat|grep -i "80"|wc -l

???????????IP??????????????????

????netstat -anp | grep 'tcp|udp' | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
????netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n
????netstat -ntu | awk '{print $5}' | egrep -o "[0-9]{1??3}.[0-9]{1??3}.[0-9]{1??3}.[0-9]{1??3}" | sort | uniq -c | sort -nr

??????TCP??????

????netstat -nat |awk '{print $6}'|sort|uniq -c|sort -rn
????netstat -n | awk '/^tcp/ {print $NF}'|sort|uniq -c|sort -rn
????netstat -n | awk '/^tcp/ {++S[$NF]};END {for(a in S) print a?? S[a]}'
????netstat -n | awk '/^tcp/ {++state[$NF]}; END {for(key in state) print key??" "??state[key]}'
????netstat -n | awk '/^tcp/ {++arr[$NF]};END {for(k in arr) print k??" "??arr[k]}'
????netstat -ant | awk '{print $NF}' | grep -v '[a-z]' | sort | uniq -c

??????80????????????20??IP

????cat /www/web_logs/waitalone.cn_access.log|awk '{print $1}'|sort|uniq -c|sort -nr|head -100
????tail -n 10000 /www/web_logs/waitalone.cn_access.log|awk '{print $1}'|sort|uniq -c|sort -nr|head -100
????cat /www/web_logs/waitalone.cn_access.log|awk '{print $1}'|sort|uniq -c|sort -nr|head -100
????netstat -anlp|grep 80|grep tcp|awk '{print $5}'|awk -F: '{print $1}'|sort|uniq -c|sort -nr|head -n20
????netstat -ant |awk '/:80/{split($5??ip??":");++A[ip[1]]}END{for(i in A) print A??i}' |sort -rn|head -n20

??????tcpdump???80?????????????

????tcpdump -i eth0 -tnn dst port 80 -c 1000 | awk -F"." '{print $1"."$2"."$3"."$4}' | sort | uniq -c | sort -nr |head -20

??????????time_wait????

????netstat -n|grep TIME_WAIT|awk '{print $5}'|sort|uniq -c|sort -rn|head -n20

???????????SYN????

????netstat -an | grep SYN | awk '{print $5}' | awk -F: '{print $1}' | sort | uniq -c | sort -nr | more

????linux?????iptables??ip?ε??Щ????????

????????IP?????????

????iptables -I INPUT -s 211.1.0.0 -j DROP

??????IP?ε????????

????iptables -I INPUT -s 211.1.0.0/16 -j DROP
????iptables -I INPUT -s 211.2.0.0/16 -j DROP
????iptables -I INPUT -s 211.3.0.0/16 -j DROP

???????????ε????????