| 1 | 3 | czfcentos | #!/bin/bash |
| 2 | | | # Kontrola poctu spojeni a pripadne zvetseni limitu |
| 3 | | | # |
| 4 | | | |
| 5 | | | #now we 3times try clean all unused iptables modules |
| 6 | | | /sbin/rmmod ip_nat iptable_nat ip_conntrack ip_tables iptable_filter ipt_REJECT 2&> /dev/null |
| 7 | | | /sbin/rmmod ip_nat iptable_nat ip_conntrack ip_tables iptable_filter ipt_REJECT 2&> /dev/null |
| 8 | | | /sbin/rmmod ip_nat iptable_nat ip_conntrack ip_tables iptable_filter ipt_REJECT 2&> /dev/null |
| 9 | | | |
| 10 | | | #test for conntrack and if no one is find then we exit the script |
| 11 | | | if [ ! -e /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_established ] |
| 12 | | | then |
| 13 | | | if [ "$1 x" = "-status x" ] |
| 14 | | | then |
| 15 | | | echo "No NAT detected" |
| 16 | | | fi |
| 17 | | | exit 0 |
| 18 | | | fi |
| 19 | | | |
| 20 | | | #when this place was reached then we are usin conntrack table |
| 21 | | | #filling all constants to get optimal timeouts |
| 22 | | | #the most important is ip_conntrack_tcp_timeout_established |
| 23 | | | echo 50 > /proc/sys/net/ipv4/netfilter/ip_conntrack_generic_timeout |
| 24 | | | echo 5 > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_close |
| 25 | | | echo 60 > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_close_wait |
| 26 | | | echo 120 > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_fin_wait |
| 27 | | | echo 60 > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_time_wait |
| 28 | | | echo 10 > /proc/sys/net/ipv4/netfilter/ip_conntrack_udp_timeout |
| 29 | | | echo 21600 > /proc/sys/net/ipv4/netfilter/ip_conntrack_tcp_timeout_established |
| 30 | | | |
| 31 | | | #now we check the size of conntrack table and if it is too tight to the |
| 32 | | | #limit then we increase this limit |
| 33 | | | ipc=`cat /proc/sys/net/ipv4/ip_conntrack_max` |
| 34 | | | ipc=`expr $ipc - 4000`; |
| 35 | | | |
| 36 | | | if [ `cat /proc/net/ip_conntrack | wc -l` -gt $ipc ] |
| 37 | | | then |
| 38 | | | if [ $ipc -lt 56000 ] |
| 39 | | | then |
| 40 | | | date | tr '\n' ' ' >> /var/log/checknat.log |
| 41 | | | echo "Increasing conntrack table size to $ipc + 8000" >> /var/log/checknat.log |
| 42 | | | ipc=`expr $ipc + 8000`; |
| 43 | | | echo "Increasing conntrack table size to $ipc" >> /var/log/checknat.log |
| 44 | | | echo $ipc > /proc/sys/net/ipv4/ip_conntrack_max |
| 45 | | | else |
| 46 | | | date | tr '\n' ' ' >> /var/log/checknat.log |
| 47 | | | echo "Conntrack table upper limit reached" >> /var/log/checknat.log |
| 48 | | | fi |
| 49 | | | fi |
| 50 | | | |
| 51 | | | if [ "$1 x" = "-status x" ] |
| 52 | | | then |
| 53 | | | echo "Conntrack TBL = "`cat /proc/net/ip_conntrack | wc -l` |
| 54 | | | echo "Conntrack MAX = "`cat /proc/sys/net/ipv4/ip_conntrack_max` |
| 55 | | | tail /var/log/checknat.log |
| 56 | | | fi |
| 57 | | | |
